Triceps Extension Research Articles

THE EFFECTIVENESS OF PROGRESSIVE RESISTANCE TRAINING IN MANAGING PROGRESSIVE SUPRANUCLEAR PALSY: A CASE STUDY

SETTING The Centre for STRONG Medicine is an outpatient multidisciplinary geriatric service at Concord Hospital, Sydney. An 82-year-old male with a primary diagnosis of Progressive Supranuclear Palsy (PSP) with cardiac and metabolic comorbidities was referred in March 2023. PSP is a rare neurological disorder that affects gait, balance, vision, and cognition. The participant mobilised with a rollator and had previously sustained vertebral and wrist fractures secondary to falls. MANAGEMENT Management was to use progressive resistance training (PRT) to combat mobility decline, prevent falls and provide education to encourage independent exercise. Initial assessment determined current health status using Falls Self Efficacy Scale (FSE-I) and Fried Frailty Phenotype (FFP) questionnaires, and measured function and strength using maximal gait speed, five times sit-to-stand (5xSTS) and one repetition maximum (1RM), respectively. FSE-I determined a high fear of falling and FFP determined frail classification. Outcomes informed the PRT exercise prescription targeting the major muscle groups for 2-3 sets of 7-9 repetitions at 70-85% 1RM progressed gradually and preformed twice weekly in a supervised group. Education regarding breathing, exercise tempo, rest, progression, and risk mitigation were provided. All outcomes were reassessed after 12-weeks of training. RESULTS Attendance was 100% (23 sessions) with improvement in all outcomes. Functional improvements included 0.25metres/second increase in maximal gait speed, 2.5 second reduction in 5xSTS, and safe mobilisation without a rollator. Strength improvements included 101% increase in 1RM leg press, 100% increase in 1RM triceps extension and 72% increase in 1RM seated row. Frailty status improved to pre-frail and fear of falling reduced. Self-reported improvements included increased steadiness and confidence exercising unsupervised. DISCUSSION Although PSP is progressive, PRT resulted in meaningful benefits in strength and function that improved daily task performance and confidence. Further research is needed to investigate the effects of PRT on PSP management in a larger cohort.

The Effect of the Pyramid Exercise Method on the Maximum Strength of the Wrestler’s Arm Muscles

Study purpose. The purpose of this study was to determine the effect of reverse grip barbell curls and barbell triceps extension exercises on increasing the maximum strength of the arm muscles of wrestling athletes. Materials and methods. This type of research is quasi-experimental. The population in the study was 24 wrestling athletes. Sampling was carried out using purposive sampling techniques, namely 10 male wrestling athletes. The research instrument was carried out by lifting a load that was only able to be lifted 1 time or expressed ability (maximum strength) using a barbell. The data analysis technique used is hypothesis testing using the t-test formula. Results. The results of this study showed that the exercises of reverse grip barbell curls and barbell triceps extension have an effect on the increase in the maximum strength of the arm muscles of wrestling athletes; from the initial test and the final test results, there was an increase with a difference of 1.04, namely from an average score of 29.9 kg in the pre-test to 32.3 kg in the post-test. Conclusions. The conclusion in this study is that there is a significant influence of the reverse grip form of barbell curls and barbell triceps extension on the increase in maximum strength of the arm muscles in wrestling athletes.

Effect of tibialis anterior muscle resistance training on ankle and foot dorsum extension function in hypertensive cerebral hemorrhage hemiplegia patients: A randomized controlled trial.

This study aimed to investigate the effect of tibialis anterior muscle resistance training on ankle and foot dorsum extension function in patients with hemiplegia caused by hypertensive cerebral hemorrhage. Fifty cases of hypertensive cerebral hemorrhage in patients with hemiplegia were selected according to the random number table method. The patients were divided into the treatment group and control group. Each group included 25 cases, and the treatment group was given routine rehabilitation treatment and passive and active foot back stretch training (300 times/d). The control group received conventional rehabilitation treatment. The conventional rehabilitation treatment included stretching, muscle strengthening and other conventional rehabilitation treatment techniques. Surface electromyography was used to evaluate the muscle strength and tension of the triceps and tibialis anterior muscles of the affected side of the patients before and after treatment. The root mean square value of the surface electromyography (RMS) of the passive triceps extension before and after treatment was used to evaluate the muscle strength and tension of the affected side. The ratio of passive traction and relaxation of the triceps before and after treatment and the ratio of active contraction and relaxation of the tibialis anterior muscle before and after treatment were recorded. There was no significant difference in surface electromyography between the 2 groups before treatment (P > .05). After 2 months of treatment, the results of patients in both groups improved compared with those before treatment. The RMS of triceps in the treatment group was significantly lower than that in the control group, and the ratio of RMS of triceps in the treatment group was significantly lower than that in the control group. The RMS during active contraction and the RMS ratio between active contraction and relaxation of the tibialis anterior muscle in the treatment group were significantly higher than those in the control group (P < .05). Tibialis anterior muscle resistance training can effectively improve the strength of the tibialis anterior muscle in patients with hemiplegia caused by hypertensive cerebral hemorrhage, reduce tension in the triceps calf muscle, and improve ankle joint function and foot dorsum extension.

Olecranon Tendo-Osseous Allograft Reconstruction for Complex Extensor Mechanism and Bone Loss at the Elbow

The purpose of this study was to present the results of olecranon tendo-osseous allograft (OTOA) reconstruction for patients with an irreparable extensor mechanism from prior trauma or failed total elbow arthroplasty (TEA). A retrospective review was performed of all patients with extensor mechanism loss after trauma or failed TEA who were treated with an OTOA to supplement fracture fixation or elbow arthroplasty, as indicated. Primary outcome measures were successful healing of the allograft, restoration of the extensor mechanism function, and Mayo Elbow Performance Scores (MEPS) at the most recent follow-up. Secondary outcomes included patients' active range of motion and unplanned operative interventions. Nine patients had extensor mechanism and proximal ulna loss as a result of prior TEA, acute trauma, or failed surgeries for prior trauma. All but one had undergone multiple prior surgeries. The mean follow-up was 27 months (6-60 months). At the final follow-up, patients reported MEPS of 92 (80-100). All patients regained active triceps extension (strength 3-5/5). Mean final range of motion was 16° (0° to 45°) extension, 124° (70° to 150°) flexion, 56° (45° to 80°) pronation, and 60° (40° to 80°) supination. Eight (89%) of the nine patients had a radiographically healed graft at the latest follow-up, of which four healed without notable complications or further surgical intervention. Complications included radial/ulnar nerve palsy, allograft olecranon stress fracture, deep infection, wound complications, instability, and complications related to the TEA prosthesis. In the setting of elbow reconstruction in which there is inadequate triceps tendon and/or olecranon bone stock to perform internal fixation and/or revision arthroplasty, OTOA may supplement elbow reconstruction, albeit with high rates of complications. A triceps-olecranon allograft, combined with either internal fixation or TEA, is a potentially useful salvage procedure for managing bone loss and an irreparable extensor mechanism deficit at the elbow. Therapeutic V.

Estimation of One-Repetition Maximum, Type, and Repetition of Resistance Band Exercise Using RGB Camera and Inertial Measurement Unit Sensors

Resistance bands are widely used nowadays to enhance muscle strength due to their high portability, but the relationship between resistance band workouts and conventional dumbbell weight training is still unclear. Thus, this study suggests a convolutional neural network model that identifies the type of band workout and counts the number of repetitions and a regression model that deduces the band force that corresponds to the one-repetition maximum. Thirty subjects performed five different exercises using resistance bands and dumbbells. Joint movements during each exercise were collected using a camera and an inertial measurement unit. By using different types of input data, several models were created and compared. As a result, the accuracy of the convolutional neural network model using inertial measurement units and joint position is 98.83%. The mean absolute error of the repetition counting algorithm ranges from 0.88 (seated row) to 3.21 (overhead triceps extension). Lastly, the values of adjusted r-square for the 5 exercises are 0.8415 (chest press), 0.9202 (shoulder press), 0.8429 (seated row), 0.8778 (biceps curl), and 0.9232 (overhead triceps extension). In conclusion, the model using 10-channel inertial measurement unit data and joint position data has the best accuracy. However, the model needs to improve the inaccuracies resulting from non-linear movements and one-time performance.

The Effect of Non-linear Periodization Strength Training on Basic and Professional Fitness of National Cross-country Skiers

PURPOSE This study investigated the effect of non-linear periodization strength training on basic and professional fitness of national cross-country skiers.METHODS The body composition (height, weight, BMI, body fat %), basic physical strength (grip strength, lung capacity), anaerobic power (peak power, average power), graded exercise test (maximum heart rate, running time, VO&lt;sub&gt;2&lt;/sub&gt;max, lactic acid), isokinetic strength (trunk strength), and 1RM (bench press, dead-lift, squat, shoulder press, leg curl, bicep curl, cable triceps extension) of nine national cross-country skiers (male: 5, female: 4) were measured. All analyses were performed using SPSS 25.0, Kruskal-Wallis H tests were applied to observe the changes by training methods. Mann-Whitney U tests were used as Post Hoc. RESULTS The results indicated that running time and VO&lt;sub&gt;2&lt;/sub&gt;max post-test improved compared to that for the pre-test for graded exercise test. The lumbar extension strength of the post-test was higher than that for pre-test. There was no significant difference in other variables. CONCLUSIONS It is suggested that nonlinear periodization strength training can be expected to improve running time, VO&lt;sub&gt;2&lt;/sub&gt;max, and trunk strength for cross-country athletes; however, it does not affect the overall changes.

Comparative Study of Resistance Training with Different Frequency on the Selected Machine Exercises Among University Males

The purpose of this study was to compare the resistance training groups with different frequency in a week on the selected machine exercises among university males. Method: Hundred participants selected randomly to join and part of this research study. Participant’s ages were in the range of 18-24 years, forty minutes of training per session. These subjects separated into two groups such as; group-A (N=50, two days of training in a week for eleven weeks), group -B (N=50, four days of training in a week for 5 and half weeks). Both the groups had gone through 22 resistance-training sessions. The impact of resistance training protocols with different frequency in a week on the groups in the selected exercises i.e. (leg press, leg extension, leg curls, high pull downs, sitting shoulder press, rear delt, sitting extensions and arm curls) had shown significant improvement. Furthermore, interestingly the group-A had shown greater performance in all the selected resistance training exercises. Group-A performance with regard to the increase by percentages; Sitting leg press performance increased by percent (18.27%). Leg extension performance was increased by percent (15.12%). Leg curls (increased by 14.22%). Lat pull down (increased by 12.78%). Sitting shoulder press (25.16%). Rear delt (increased by 10.04%). Triceps extension (performance increased by 7.83%). Arm curls performance increased by (8.74%). These findings were consistent with the previous studies they are as follows; (M. S. Faigenbaum et al, 1997). In a previous research, study it was investigated with regard to the training frequency comparison for the parallel bench press exercise 03 sessions is profound to 1 or 2 sessions (ACSM 1998).

The Van Gorder approach for total elbow arthroplasty.

Surgical management of the triceps during exposure for total elbow arthroplasty (TEA) is critical to a successful outcome. Previously described techniques include elevating the triceps insertion from one side or leaving the triceps insertion attached and dislocating the joint. Another approach to the elbow, first described in 1933 by Willis Campbell, MD, and subsequently modified by George Van Gorder, MD, involves turning down the triceps tendon without disrupting the triceps insertion. This approach offers complete visualization of the joint and provides excellent exposure for TEA. Only the original report of the technique and a small series of patients using this technique for TEA exist in the literature. The goal of this study was to evaluate outcomes of the Van Gorder approach in a large series of patients undergoing TEA. All patients who underwent TEA from 2008 to 2016 were retrospectively reviewed. Only patients who underwent primary TEA performed through the Van Gorder approach with at least 6 months' follow-up were included for analysis. Patients with prior elbow surgery were excluded. Demographic data, indication for surgery, postoperative range of motion, triceps function, and need for additional surgery were recorded. Prospectively collected visual analog scale (VAS) and Global Health Quality of Life scores were also analyzed. A total of 53 patients met inclusion criteria. The mean age was 62 years, 81% were female, and the average follow-up was 30.2 months. The most common surgical indications included inflammatory arthritis (47%), osteoarthritis (24%), and fracture (19%). Postoperatively, average elbow arc of motion was an 8°-137°. There was 1 patient (1.89%) who developed failure of their triceps extension mechanism. A total of 10 patients (19%) underwent additional elbow surgery most commonly for superficial wound complications. Preoperative VAS scores decreased significantly, starting at 3 months postoperatively (6.76 to 3.37, P < .001), and remained constant at the 12- and 24-month postoperative visits. This is the largest study evaluating the Van Gorder surgical approach to the elbow for primary TEA with an average follow-up of 32 months. Overall rates of triceps failure and reoperation are consistent with other approaches for TEA.

The Effects of Resistance Training on Architecture and Volume of the Upper Extremity Muscles: A Systematic Review of Randomised Controlled Trials and Meta-Analyses

To systematically review the effects of exercise on fascicle geometry and muscle size parameters of the upper extremity muscles, the CENTRAL, CINAHL, PubMed and OpenGrey databases were searched on 31 July 2021. Finally, 17 randomised controlled trials (RCTs) were included in this systematic review. High-intensity bench press training (g = 1.03) and 12 RM bench press exercises (g = 1.21) showed a large effect size on increasing pectoralis major muscle size. In the elbow extensors, large effects were reported for an increase in muscle size with isometric maximal voluntary co-contraction training (g = 1.97), lying triceps extension exercise (g = 1.25), and nonlinear periodised resistance training (g = 2.07). In addition, further large effects were achieved in the elbow flexors via traditional elbow flexion exercises (g = 0.93), concentric low-load forearm flexion-extension training (g = 0.94, g = 1), isometric maximal voluntary co-contraction training (g = 1.01), concentric low-load forearm flexion-extension training with blood flow restriction (g = 1.02, g = 1.07), and nonlinear periodised resistance training (g = 1.13, g = 1.34). Regarding the forearm muscles, isometric ulnar deviation training showed a large effect (g = 2.22) on increasing the flexor carpi ulnaris and radialis muscle size. Results show that these training modalities are suitable for gaining hypertrophy in the relevant muscles with at least four weeks of training duration. Future RCTs should investigate the effects of exercise modalities on the triceps brachii fascicle geometry, the infraspinatus muscle thickness (MT) and the subscapular MT due to their associations with sports performance.

Acute Behavior of Oxygen Consumption, Lactate Concentrations, and Energy Expenditure During Resistance Training: Comparisons Among Three Intensities.

Purpose: This study aimed to compare the oxygen consumption, lactate concentrations, and energy expenditure using three different intensities during the resistance training sessions.Methods: A total of 15 men (22.9 ± 2.61 years) experienced in resistance training underwent 3 sessions composed of 8 exercises (chest press, pec deck, squat, lat pull-down, biceps curl, triceps extension, hamstring curl, and crunch machine), which were applied in the same order. The weight lifted differed among the sessions [high session: 6 sets of 5 repetitions at 90% of 1-repetition maximum (1-RM); intermediary session: 3 sets of 10 repetitions at 75% of 1-RM; and low session: 2 sets of 15 repetitions at 60% of 1-RM]. The oxygen consumption (VO2)—during and after (excess post-exercise oxygen consumption (EPOC)) the session, blood lactate concentration, and energy expenditure (i.e., the sum of aerobic and anaerobic contributions, respectively) were assessed.Results: The VO2 significantly decreased in the function of the weight lifting (F(2.28) = 17.02; p < 0.01; = 0.32). However, the aerobic contributions significantly increase in the function of the weight lifting (F(2.28) = 79.18; p < 0.01; = 0.75). The anaerobic contributions were not different among the sessions (p > 0.05; < 0.01). Thus, the total energy expenditure during the session (kcal) significantly increased in the function of the weight lifting (F(2.28) = 86.68; p < 0.01; = 0.75). The energy expenditure expressed in time unit (kcal·min−1) was higher in low session than in high session (F(2.28) = 6.20; p < 0.01; = 0.15).Conclusion: The weight lifted during resistance training-induced different physiological responses, which induced higher energy expenditure per unit of time during the low session.

Bilateral triceps tendon approach is flexible and efficient in the treatment of type C distal humerus fractures

PurposeThe purpose of this study was to assess and compare elbow range of motion, triceps extension strength and functional results of type C (AO/OTA) distal humerus fractures treated with bilateral triceps tendon (BTT) approach and olecranon osteotomy (OO). At the same time, we are also trying to know whether BTT approach can provide sufficient vision for comminuted intra-articular fractures of the distal humerus, and whether it is convenient to convert to the treatment to total elbow arthroplasty (TEA) or OO. MethodsPatients treated with OO and BTT approaches for type C distal humerus fractures between July 2014 and December 2017 were retrospectively reviewed. Inclusion criteria include: (1) patients' age were more than 18 years old, (2) follow-up was no less than 6 months, and (3) patients were diagnosed with type C fractures (based on the AO/OTA classification). Exclusion criteria include: (1) open fractures (Gustillo type 2 or type 3), (2) treated by other approaches, and (3) presented with combined injuries of ipsilateral upper extremities, such as ulnar nerve. Elbow range of motion and triceps extension strength testing were completely valuated, when the fractures had healed. Assessment of functional results using the Mayo elbow performance score and complications were conducted in final follow-up. The data were compared using the two tailed Student's t-test. All data were presented as mean ± standard deviation. ResultsEighty-six patients of type C distal humerus fractures, treated by OO and BTT approach were retrospectively reviewed between July 2014 and December 2017. Fifty-five distal humerus fractures (23 males and 32 females, mean age 52.7 years) treated by BTT approach or OO were included in this study. There were 10 fractures of type C1, 16 type C2 and 29 type C3 according to the AO/OTA classification. Patients were divided into two surgical approach groups chosen by the operators: BTT group (28 patients) and OO group (27 patients). And the mean follow-up time of all patients was 15.6 months (range, 6–36 months). Three cases in BTT group were converted to TEA, and one converted to OO. Only one case in BTT group presented poor articular reduction with a step more than 2 mm. There were not significantly different in functional outcomes according to the Mayo elbow performance score, operation time and extension flexion motion are values between BTT group and OO group (p > 0.05). Complications and reoperation rate were also similar in the two groups. Triceps manual muscle testing were no significant difference in the two groups, even subdivided in elder patients (aged >60 years old). ConclusionBTT is a safe approach to achieve similar functional result comparing with OO. BTT were not suitable for every case with severe comminuted pattern, but it avoids the potential complications related to OO, and has no complications concerning with triceps tendon. It is convenient for open reduction internal fixation and flexible to be converted to OO, as well as available to be converted to TEA in elder patients.

Eccentric-only versus concentric-only resistance training effects on biochemical and physiological parameters in patients with type 2 diabetes

BackgroundThe benefits of resistance training for patients with type 2 diabetes (T2D) are well documented; however, the effects of exercise with different muscle contraction types such as eccentric versus concentric contractions on physiological outcomes for this population are not clear. This study compared eccentric-only (ECC) and concentric-only resistance training (CON) to test the hypothesis that ECC would be superior to CON to improve insulin sensitivity, lipid profile, body composition, muscle strength and physical function of patients with T2D.MethodsAdults with T2D (50–79 years) were allocated to the ECC (n = 9) or CON group (n = 9). Resistance exercises (chest press, lateral pulldown, bicep curl, triceps extension, leg extension, leg curl, calf raise, abdominal crunch) consisting of 2–3 sets of 10 eccentric-only (5 s) or concentric-only contractions (1–2 s) was performed twice a week for 12 weeks. Changes in blood biomarkers, body composition, muscle strength and physical function from pre- to post-intervention were compared between groups.ResultsOverall rating of perceived exertion (RPE, 1–10 Borg scale) was lower (p < 0.05) for ECC (2.9 ± 1.2) than CON (5.4 ± 1.1). No significant changes in blood biomarkers were found for both groups. Lean mass increased [effect size (ES) = 0.148, ECC 3.2 ± 6.9%; CON 3.6 ± 2.3%], and fat mass decreased (ES = 0.545, ECC − 6.1 ± 12.4%; CON − 7.1 ± 16.4%) (p < 0.05) similarly. One-repetition maximal strength of each exercise increased (p < 0.05) for both ECC (12–37%) and CON (27–68%). Both groups improved (p < 0.05) 6-min walk distance (ES = 0.083, ECC 12.2 ± 2.3%; CON 12.5 ± 15.3%) and chair rise time (ES = 0.463, ECC − 13.4 ± 25.4%; CON − 20.0 ± 53.3%) but only ECC improved (p < 0.05) the timed up-and-go test (− 11.3 ± 13.6%, ES 0.014). No significant changes in balance tests were found for both groups.ConclusionThese results did not fully support the hypothesis but showed that ECC was as effective as CON to improve body composition, muscle strength, and physical function with lesser RPE. Future studies should investigate whether larger differences between ECC and CON are evident when increasing the exercise frequency and matching the intensities of the two-exercise protocols.Trial registration ACTRN12621001026819 (retrospectively registered on 5th Aug 2021).

Age And Motor Performance: An Analysis Of Biomechanical Capacities Across The Lifespan

Advancing age associates with losses in strength and motor function. As technology enables more precise motor assessment, it is important to update our understanding of the relationship between age and performance. PURPOSE: To evaluate the effect of age on different biomechanical capacities of upper limb motions. METHODS: We tested 183 males and 48 females (ages 7-79) on a Proteus device. They performed 9,289 total sets of 9.6 ± 3.2 repetitions across 10 exercises: internal rotation (IR) and external rotation (ER) at 0° shoulder abduction, single-handed biceps curl (BC1), triceps extension (TE1), chest press (CP1), and horizontal row (HR1), and double-handed biceps curl (BC2), triceps extension (TE2), chest press (CP2), and horizontal row (HR2). We measured power, acceleration, velocity, deceleration, and consistency of motion in serial repetitions. We stratified subjects into age groups by decade and performed multivariate tests to evaluate categorical differences by age and sex. RESULTS: Among men, composite scores across all exercises found peak performance in the 20-29 yr group for power, acceleration, velocity, and deceleration (p < 0.005). Consistency was highest in the 50-59 yr group; categorical comparisons to subjects <30 yr were significant (p < 0.001). Precise estimates of age revealed highest power to occur between the ages of 16-27 (p < 0.001), acceleration from 20-26 (p < 0.001), velocity from 17-26 (p < 0.001), deceleration from 20-28 (p < 0.001), and consistency from 30-72 (p < 0.001). Among women, peak power, velocity, and deceleration occurred in the 20-29 yr group. Acceleration improved through 30-39 yr, followed by a steep decline (p < 0.001). Consistency improved through 50-59 yr; differences compared to subjects <30 yr and > 70 yr were significant (p < 0.05). Across both sexes, acceleration was unaffected by age in ER (p = 0.409), BC2 (p = 0.133), TE1 (p = 0.164), TE2 (p = 0.867), and CP1 (p = 0.390), and deceleration was unaffected in ER (p = 0.522), BC2 (p = 0.107), HR1 (p = 0.658), HR2 (p = 0.200), and CP1 (p = 0.087). CONCLUSIONS: Unique features of motor decline may arise at different ages, and are likely to differ between men and women. In our sample, men between the ages of 16-28 exhibited peak performance in all mechanical domains except consistency while women exhibited lower peaks but more gradual decline.

Effect of blood flow restriction during low-intensity resistance training on bone markers and physical functions in postmenopausal women

BackgroundThe aim of this study was to investigate the effects of 12-week low intensity resistance training (RT) with blood flow restriction on bone mineral density (BMD), bone turnover markers (BTM), physical functions, and blood lactate concentration in postmenopausal women with osteoporosis or osteopenia. Methods26 study participants (56 ± 1.8yrs, T-score: −2.5 ± 0.7) were randomly assigned into Moderate to High-Intensity RT (MHIRT, n = 7), BFR combined with Low-Intensity RT (LIBFR, n = 7), Low-Intensity RT (LIRT, n = 6), or Control group (CON, n = 6). Exercise group performed leg press, leg extension, biceps curl, and triceps extension 3 times a week for 12 weeks. Training intensity were set at 60% of 1-repetition maximum (1-RM) for MHIRT, and at 30% of 1-RM for LIBFR and LIRT, and reset every 4 weeks for increasing intensity. ResultsLower, and upper limb 1-RM only increased in MHIRT (65%, p < 0.001), and LIBFR (40%, p < 0.05), while LIRT only showed increment on lower limb 1-RM (28%, p < 0.05). All exercise groups demonstrated significant increment on blood lactate concentration after training session (p < 0.001). However, LIBFR showed 2.7 folds higher increment than LIRT (p < 0.001). Although no changes were observed in MHIRT, LIBFR, and LIRT, CON showed significant decrease in BMD (p < 0.05). While, LIRT showed no responses on BTM, LIBFR significantly increased bone formation markers (P1NP) about 7.05 ng/ml (p < 0.05). Lastly, balance improvement was only found in MHIRT, and LIBFR (p < 0.05). Conclusion12-week LIBFR can be implied as a safe, and effective method to improve muscle strength, P1NP, and balance similar to MHIRT in postmenopausal women with osteoporosis or osteopenia.

Effectiveness of a 2-Week Strength Training Learning Intervention on Self-selected Weight-Training Intensity.

Glass, SC, Ahmad, S, and Gabler, T. Effectiveness of a 2-week strength training learning intervention on self-selected weight-training intensity. J Strength Cond Res 34(9): 2443-2448, 2020-The purpose of this study was to determine the effectiveness of an imposed (IM) vs. self-selected (SS) 2-week strength training intervention on SS resistance training intensity. Subjects 18-40 years (SS n = 10 and IM n = 10) were provided resistance training orientation (chest press, leg press, triceps extension, bicep curl, and shoulder press). On 6 different training days, subjects completed 2 sets on each machine while blinded to the load. The SS group SS loads without any intensity or effort feedback. Load, repetitions, and ratings of perceived exertion (RPE) were recorded. The IM group was encouraged to lift to fatigue, and if they exceeded 12 repetitions, subsequent load was increased (goal-attain 70% one repetition maximum [1RM]). After training, SS and IM SS loads and repetitions for all lifts, plus 3 novel lifts (pec fly, leg extension, and shoulder raise). One repetition maximum was assessed last. Comparisons between groups were made using 2-way analysis of variance. There were significant main effects for % 1RM for the condition and day (day 1 IM = 57.2 ± 12.0%, SS = 47.2 ± 13.7% and day 6 IM = 74.7 ± 10.8%, SS = 66.2 ± 13.4%). There were significant effects across days for reps (day 1 IM = 10.8 ± 4.8, SS = 12.3 ± 4.0 and day 6 IM = 9.3 ± 3.6, SS = 10.0 ± 3.0) and RPE (day 1 = 15.4 ± 2.0 and day 6 = 16.5 ± 1.9). For both SS and IM post-training SS loads exceeded 60% 1RM. However, among the novel lifts, only the pec fly was greater than 60% 1RM (pec fly 63.0 ± 11.0%, leg extension 39.8 ± 12.5%, and shoulder raise 53.1 ± 12.8%). Two weeks of supervised resistance training resulted in both IM and SS self-selecting loads greater than 60% 1RM. There were no differences after 2-weeks of training between IM load and SS load groups.

Comparing Bilateral Muscular Imbalance Ratios In The Upper Extremities

Muscular imbalances may increase the risk of injury and decrease physical performance. Conventional wisdom suggests dominant side musculature may be more developed owing to preferred usage. Quantifying muscle imbalance between non-dominant and dominant arms is facilitated by technology that permits the measurement of arm power output across a range of resistances. PURPOSE: To compare power output achieved by the dominant and non-dominant arms under various load conditions. METHODS: 18 females and 14 males (21.0 ± 2.3 years, 66.9 ± 4.3 inches, 168.3 ± 36.2 lbs) were enrolled into an optimal muscle loading program using Proteus (Proteus Motion, USA). Each subject performed the following ten movements: abduction, adduction, external rotation, internal rotation, biceps curl, triceps extension, horizontal push, horizontal row, vertical push, and vertical row. Each movement was repeated twice under four separate loads: 7lb, 14lb, 21lb, and 28lb. Maximum average power for each movement was recorded in watts for further analysis. A paired-samples t-test, under the 28lb condition, was used to determine the relationship between the mean power of all subjects' dominant versus non-dominant arms. Repeated measures ANOVA was run to then determine differences in mean powers. RESULTS: Power achieved in all movements was similar (r values ranged from 0.723-0.954; p<0.001) at the 28 lb load. On average, an individual's dominant arm during abduction produced less power than the non-dominant arm (143.6 ± 63.5 watts compared to 127.7 ± 50.2; p=0.050). However, external rotation of the dominant arm tended to generate more than non-dominant arms (p=0.053). Correlation values close to 1.00 across all comparisons demonstrated the variance between arms was minimal. The results of the ANOVA showed no statistical differences between arms. CONCLUSIONS: The current assumption that dominant limbs are capable of greater power may not be true in all planes and when tested with isotonic loads applied in three-dimensional space. Our subjects did not demonstrate power imbalances between dominant and non-dominant arms.

Muscle Strength And Size Correlations At Baseline And Following Unilateral Resistance Training

Traditional theory has linked muscular size and muscular strength at baseline and following resistance training, though recent studies have challenged the independence of these traits, especially within the context of chronic resistance training. We previously completed a large study of strength and size changes with 12 weeks of progressive resistance training in previously untrained adults. PURPOSE: We examined the effects of progressive resistance training on the relationship between muscle volume (VOL) and muscle strength, measured as both dynamic (one repetition maximum; 1-RM) and isometric (maximal voluntary contraction; MVC) strength. We further tested for sex differences in these relationships. METHODS: 665 healthy young (18>age>40) and untrained individuals (254 men and 411 women) were tested. Muscle volume (by magnetic resonance imaging) and strength (1-RM and MVC) measures were taken before and after 12-weeks of resistance training of the non-dominant biceps/triceps. Subjects trained with progressively increasing weights twice per week using biceps preacher curl, biceps concentration curl, standing biceps curl, overhead triceps extension, and triceps kickback. We used Pearson correlations to test strength-size relationships in the entire cohort and within sex both at baseline and percent change following training. RESULTS: Weak to moderate correlations were seen at baseline: VOL-1-RM (r=0.43 in all, 0.32 in women and 0.14 in men, all p<0.01) and VOL-MVC (r=0.34 in all, 0.19 in women and 0.28 in men, all p<0.01). Following training, specific relationships between percent changes in strength and size were: VOL-1-RM (r=0.04 in all, p=0.3; 0.13 in women, p=0.006; and 0.14 in men, p=0.03) and VOL-MVC (r=0.13 in all, p<0.01; 0.19 in women, p<0.01; and 0.12 in men, p=0.054). CONCLUSION: At baseline, significant but weak correlations exist between strength and size, regardless of sex. Following training, correlations became weaker, and even insignificant for change in volume to change in 1-RM in the whole cohort and change in volume to change in MVC in men. Together, these data provide evidence that isometric and dynamic strength are complex traits, especially following resistance training, that are affected by factors beyond size.

Comparing the effects of resistance exercise type on serum levels of oxidative stress and muscle damage markers in resistance-trained women

The aim of the current study is to compare the effects of hypertrophy-, strength-, and power-type resistance exercise training types on hydrogen peroxide (H2O2), malondialdehyde (MDA), total lactate dehydrogenase (LDH), and total creatine kinase (CK) in resistance-trained women. After determining one-repetition maximum (1-RM), ten resistance-trained women (age 26.30 ± 4.95 years; body mass index 22.07 ± 2.02 kg/m2; body fat 24.64 ± 4.98%) conducted hypertrophy-type (70% of 1-RM), strength-type (90% of 1-RM), and power-type (45% of 1-RM) resistance exercise for three consecutive weeks. The movements included lever leg extension, reverse-grip lat pull-down, horizontal leg press, standing biceps cable curl, lying leg curl, machine bench press, standing cable triceps extension, and seated calf raises. Fasting blood samples were obtained immediately before and immediately after each trial. Statistical analyses were performed using the t test, Wilcoxon, and analysis of covariance. The significance level was set at P < 0.05 level. The results indicated that one bout of hypertrophy-, strength-, and power-type resistance exercises had no significant effects on H2O2, MDA, and total LDH levels. However, serum total CK level significantly increased after all the three types of resistance exercise. Power resistance exercise resulted in a higher total CK level than hypertrophy and strength types. Although the three types of hypertrophy, strength, and power exercise cause muscle damage, they do not exacerbate oxidative stress in resistance-trained women.

Comparison of CrossFit Barbara and classic resistance trainings for the protection of strength performance during off-season in kickboxers

BACKGROUND: The inability of athletes to train or the decrease in the intensity and frequency of training may cause athletes to lose performance. Particularly in view of the current COVID-19 pandemic, maintaining strength outside the normal framework provides an advantage to athletes for the next competitions. OBJECTIVE: To compare the CrossFit Barbara which can be applied easily at home during the off-season or some situations such as the epidemic limitation to classic resistance training methods used to maintain the strength performance of national kickboxers. METHODS: Forty-three national kickboxers, CrossFit (CF, n= 22), and resistance training (RT, n= 21), participated in this study. While CF performed 20 pull-ups, 30 push-ups, 40 sit-ups, and 50 squat exercises, RT performed bench press, lat pull down, leg press, biceps curl, and triceps extension exercises twice per week for six weeks. Before and after the six weeks, the following variables were measured; body mass (BM) and body fat percentage (FP), VO2max, bench press (BP), squat (SQ), leg strength (LS), hand grip strength (HGS), pull-up, push-up and counter movement jump (CMJ). RESULTS: BP (p&lt; 0.001, F= 41.125, ηp2= 0.501), SQ (p&lt; 0.001, F= 26.604, ηp2= 0.394), LS (p&lt; 0.001, F= 15.234, ηp2= 0.271), push-up (p&lt; 0.001, F= 31.978, ηp2= 0.438) and pull-up (p&lt; 0.001, F= 24.410, ηp2= 0.373) values changed significantly in group-time interaction between CF and RT groups, while there was no significant difference for the BM (p= 0.198, F= 1.715, ηp2= 0.040), Fat (p= 0.265, F= 1.279, ηp2= 0.030), HGS (p= 0.665, F= 0.190, ηp2= 0.005, CMJ (p= 0.054, F= 3.946, ηp2= 0.088) and VO2max (p=0.747, F= 0.106, ηp2= 0.003). Furthermore, according to the before and after study values, BP, SQ, LS, and CMJ decreased significantly (p&lt; 0.05) while BM, FP, HGS, VO2max, pull-up and push-up variables did not in the CF (p&gt; 0.05). In the RT, the pull-up and push-up variables decreased significantly (p&lt; 0.05) while there was no significant difference for BP, SQ, LS, HGS, VO2max, body mass, body fat percentage and CMJ (p&gt; 0.05). CONCLUSION: CF Barbara workout was more effective in maintaining strength endurance performances, and RT in maintaining maximum strength performances. According to the individual performance needs of athletes, reasonable training method can be used to prevent performance decrement in the strength domain.

Effect of pre-fatiguing the triceps brachii on subsequent strength performance and myoelectric activity in the barbell, dumbbell and Smith machine bench press

Objective: The purpose of this study was to examine the effect of pre-fatiguing the triceps brachii on subsequent strength performance and myoelectric activity in the barbell, dumbbell, and Smith machine bench press.&#x0D; Method: Nineteen trained men participated of this study (27.9 ± 4.5 years; 1.72 ± 0.1 m; 80.3 ± 9.2 kg). Ten-repetition maximum loads were determined for the triceps extension as well as the barbell barbell, dumbbell and Smith machine bench press. Three experimental protocols were performed in a randomized design. All experimental protocols began with four sets of the triceps extension (performed with a high pulley) to repetition failure followed by four sets to repetition failure for one of three bench press modalities. Two minute-rest intervals were adopted between sets and exercises. Total repetitions (work), training volume and myoelectric activity of pectoralis major, anterior deltoid, biceps brachii, and triceps brachii were recorded during each bench press modality.&#x0D; Results: Significantly greater activity of the biceps brachii was observed during performance of the dumbbell bench press versus barbell and Smith machine bench press. No other significant differences were observed between protocols.&#x0D; Conclusion: Therefore, considering the training volume and myoelectric activity of the synergistic muscles, similar performance across bench press modalities can be expected when preceded by performance of a triceps extension.