Seconds Of Rest Research Articles

The Effect of Citrulline Malate Supplementation on Muscle Fatigue Among Healthy Participants.

Farney, TM, Bliss, MV, Hearon, CM, and Salazar, DA. The effect of citrulline malate supplementation on muscle fatigue among healthy participants. J Strength Cond Res 33(9): 2464-2470, 2019-The focus of the investigation was to examine the effects of citrulline malate (CM) on muscular fatigue in healthy, recreationally trained participants. Twelve participants (men = 6 and women = 6) (24.1 ± 3.9 years) visited the laboratory on 3 separate days, all separated by 1 week. Each visit consisted of consuming 1 of 3 treatments: placebo, CM (8 g), and control in which no drink mixture was consumed. For each day of testing, participants consumed assigned treatment and performed 1 high-intensity exercise trial consisting of squats, lunge jumps, squat jumps, and lateral jumps. Participants performed the exercises in the listed order, which was designated as 1 round. Each participant performed 3 rounds, with the work-to-rest ratio being 20 seconds of work and 30 seconds of rest. A 1-minute rest was given between rounds. A pre/post-exercise isokinetic leg extension test was performed to measure for peak power, peak torque, and rate of fatigue. In addition, blood lactate was obtained pre/post-exercise. There were no treatment or interaction effects (p > 0.05) for peak torque, peak power, rate of fatigue, or blood lactate accumulation. However, there was a statistical significant decrease from pre/post-exercise for peak torque (p = 0.003), peak power (p = 0.003), and rate of fatigue (p = 0.001). In addition, lactate accumulation did increase significantly from pre/post-exercise (p = 0.0001). Finally, neither total work nor final heart rate was statistically significant between the treatments (p > 0.05). Citrulline malate was not effective in improving performance or alleviating fatigue after a high-intensity exercise session.

Postexercise Hypotension and Heart Rate Variability Responses Subsequent to Traditional, Paired Set, and Superset Resistance Training Methods.

Paz, GA, Iglesias-Soler, E, Willardson, JM, Maia, MdF, and Miranda, H. Postexercise hypotension and heart rate variability responses subsequent to traditional, paired set, and superset resistance training methods. J Strength Cond Res 33(9): 2433-2442, 2019-The purpose of this study was to compare training volume, postexercise hypotension (PEH), and heart rate variability (HRV) responses to different strength training methods. Thirteen trained men volunteered for this study. Three training methods were completed in a randomized design, which included: Traditional Set (TS)-3 successive sets for the lying bench press (LBP), lat pulldown (LPD), incline 45° bench press (BP45), seated close-grip row (SCR), triceps extension (TE), and biceps curl (BC), with a 90-second rest interval between sets and exercises; Paired Set (PS)-3 paired sets for the LBP-LPD, BP45-SCR, and TE-BC, with a 90-second rest interval between sets and exercises; and superset (SS)-3 supersets for the LBP-LPD, BP45-SCR, and TE-BC. During the SS session, no rest was permitted between PSs, followed by 180 seconds of rest after each SS. Ten repetition-maximum (RM) loads were adopted for all exercises. Blood pressure (BP) and HRV were measured at baseline, immediately aftersession, and at 10-minute intervals until 60 minutes after session. Significantly greater training volume was noted under the SS method (8,608.6 ± 2,062.2 kg) vs. the TS method (7,527.5 ± 2,365.1 kg), respectively. Significantly greater training volume was also observed under the PS method (8,262.3 ± 2,491.2 kg) vs. the TS method (p ≤ 0.05). No main effects for HRV and PEH were noted between protocols (p > 0.05). However, similar PEH response intraprotocols were observed for the TS, PS, and SS methods (p ≤ 0.05). Considering the duration of the PEH intraprotocol, large effect sizes were noted for the SS and PS methods vs. the TS method in diastolic and mean BP. Therefore, both the PS and SS methods may be an alternative to the TS method to achieve greater total repetitions and training volume with a tendency toward a longer PEH response.

Comparing the Electromyography Activity of Core Muscles During Side Plank Exercise on Stable and Unstable Surfaces

Objective Numerous abdominal exercises with Swiss ball are used to improve core stability with strengthening and rehabilitation goals. It is claimed that the stability exercises have a greater impact on core muscle activation, but the validity of this claim is still in doubt. Moreover, there is no comprehensive study on the comparison of the core muscles activity in different core stability exercises. Therefore, the purpose of this study was to compare the Electromyography (EMG) activity of core muscles while performing side plank on stable and unstable (Swiss ball) surfaces. Methods Fifteen male students of Allameh Tabataba’i University were selected for the study based on inclusion and exclusion criteria. The EMG activity of gluteus medius, rectus abdominis, external oblique, and internal oblique muscles in subjects was recorded while performing side plank exercise on a fixed surface and a Swiss ball (2 sets of 5 seconds with a 30-second rest interval). Results There was a significant difference in the EMG activity of gluteus medius, external oblique and rectus abdominis muscles between two conditions of with and without Swiss ball (P<0.05), but no significant difference was observed in the EMG activity of internal oblique muscle (P>0.05). Conclusion Side plank exercise on the unstable surfaces (Swiss balls) can cause changes in the EMG activity of gluteus medius, rectus abdominis and external oblique muscles compared to when the exercise is performed on stable surfaces, and highly involved the pelvic lumbar muscles effective in maintaining core stability. Therefore, the use of side plank exercise on unstable conditions in a progressive program with gradually increased intensity is recommended which can be effective in strengthening and applying effective muscle contractions useful for core stability.

Individual and Combined Effect of Inter-repetition Rest and Elastic Bands on Jumping Potentiation in Resistance-Trained Men.

Nickerson, BS, Williams, TD, Snarr, RL, and Park, K-S. Individual and combined effect of inter-repetition rest and elastic bands on jumping potentiation in resistance-trained men. J Strength Cond Res 33(8): 2087-2093, 2019-The purpose of this study was to determine the individual and combined effects of cluster sets (CS) and elastic bands for jumping potentiation in resistance-trained men. Twelve resistance-trained men (age: 22 ± 3 years) participated in this study. In a random order, participants completed 1 set of 3 repetitions at 85% 1-repetition maximum for the parallel back squat: (a) traditional set with continuous repetitions; (b) continuous repetitions with elastic bands (BANDS); (c) CS with 30 seconds of rest between each repetition (CS30); and (d) CS with 30 seconds of rest between each repetition and elastic bands (CS + BANDS). Vertical jump height (JH) and peak power (PP) were measured before exercise (baseline) and at 1, 4, 7, and 10 minutes after exercise for each condition. Results revealed that PP at 10 minutes was significantly higher than 7 minutes for BANDS (p = 0.035) and that 4 and 7minutes were both significantly higher than baseline for CS + BANDS (p = 0.008 and 0.031, respectively). No other differences were observed. There were medium effect sizes (ESs) for PP with BANDS (ES = 0.58 at 10 minutes), CS30 (ES = 0.53 and 0.64 at 7 and 10 minutes, respectively), and CS + BANDS (ES = 0.64, 0.78, and 0.66 at 4, 7, and 10 minutes, respectively). All remaining ES for JH and PP were trivial to small. Based on the moderate magnitude of effect, BANDS, CS30, and CS + BANDS were effective at potentiating vertical jump power. CS + BANDS is a more practical approach to potentiate vertical jump power when athletes are under strict time restraints.

Lower-Load is More Effective Than Higher-Load Resistance Training in Increasing Muscle Mass in Young Women.

Franco, CMdC, Carneiro, MAdS, Alves, LTH, Júnior, GNdO, de Sousa, JdFR, and Orsatti, FL. Lower-load is more effective than higher-load resistance training in increasing muscle mass in young women. J Strength Cond Res 33(7S): S152-S158, 2019-This study was designed to investigate the impact of load (higher vs. lower) performed until or close to volitional fatigue on muscle strength (MS) and fat and bone-free lean mass (FBFM) in young women. To do this, 32 women performed resistance training (RT) in 1 of 2 conditions: lower-load RT (LL; n = 14, age = 24.3 ± 4.8 years and body mass index [BMI] = 23.3 ± 2.8 kg·m) and higher-load RT (HL; n = 18, age = 23.0 ± 3.3 years and BMI = 22.4 ± 3.3 kg·m). Leg FBFM (DXA) and MS (1 repetition maximum-unilateral leg extension [LE]) were evaluated before and after 9 weeks (the first week was used for familiarization) of RT. Both groups performed 3 unilateral exercises (LE, leg curl, and leg press), 3 sets per exercise, 60-90 seconds of rest between sets, 2 days per week. In the LL group, the loads used in the exercises were the loads necessary to perform 30-35 repetitions in the first set. For the HL group, the loads used were the loads necessary to perform 8-10 repetitions in the first set. The LL group showed higher RT volume than the HL. Both groups showed leg muscle mass gains (p < 0.05). However, the LL group was better [p = 0.032 and effect size (eta = 0.14 [large]) than the HL group in leg FBFM gains (LL = 0.3 kg [IC 95%: 0.4 kg; 0.2 kg] and HL = 0.1 kg [IC 95%: 0.2 kg; 0.0 kg]). Both groups showed MS gains, without any difference between them (LL = 3.4 kg [IC 95%: 4.4 kg; 2.5 kg] and HL = 4.2 kg [IC 95%: 5.1 kg; 3.3 kg]; p = 0.239). Thus, lower-load RT is more effective than higher-load RT in increasing FBFM, but not MS in novice young women.

Acute Effects of Whole-Body Vibration Training on Endothelial Function and Cardiovascular Response in Elderly Patients with Cardiovascular Disease.

The aim of this single-arm pilot study was to determine the effects of whole-body vibration training (WBVT) on endothelial function in elderly patients with cardiovascular diseases, as well as its safety. A total of 20 elderly patients with stable cardiovascular diseases underwent WBVT, which consisted of five static resistance training exercises (squats, wide stance squats, toe-stands, squats + band, and front lunges). The parameters of WBVT included vertical vibrations, 30 Hz frequency, and a 3-mm peak-to-peak amplitude. Each vibration session lasted 30 seconds, with 120 seconds of rest between sessions. Before and after WBVT, the reactive hyperemia peripheral arterial tonometry index (RH-PAT index) and transcutaneous oxygen pressure (tcPO2) were recorded as a measure of endothelial function and peripheral blood circulation. Systolic blood pressure, diastolic blood pressure, heart rate, and arterial oxygen saturation of pulse oximetry (SpO2) were measured at each rest interval as well as before and after WBVT. All patients completed our WBVT protocol without adverse events. The RH-PAT index significantly increased following WBVT (1.42 to 2.06, P < 0.001). There were no significant changes in heart rate (P = 0.777), systolic blood pressure (P = 0.183), diastolic blood pressure (P = 0.925), or SpO2 (P = 0.248) during WBVT. In conclusion, we demonstrated the acute effects of WBVT on endothelial function, with no reports of adverse events. These findings support the need for further randomized controlled studies to investigate the long-term effects of WBVT.

Relationship between Muscle Damage Magnitude and Sense of Knee Position

It has been proposed in the literature that muscle damage may temporarily and negatively affect proprioceptive capacity, which can be tested through the ability to replicate angles, while muscle damage can be verified by quantifying creatine kinase (CK) in the bloodstream. PURPOSE: to verify the relationship between muscle damage and sense of position in the isokinetic dynamometer, in knee extensors, after an eccentric exercise protocol. METHODS: ten male college students (age: 20.6 ± 1.8 years, body mass: 75.0 ± 11.7 kg, height: 177.4 ± 6.9 cm), with no prior experience with resistance exercises, were submitted to an eccentric exercise protocol, in the isokinetic dynamometer, for induction of muscle damage composed of two phases: 1st phase: 10 sets of 10 repetitions with 30 seconds of rest (100 eccentric contractions) - Speed ​​= 30 ° / s. There was a 5 minute break between the phases. 2nd phase: 11 sets of 10 repetitions and 30 seconds of rest (110 eccentric contractions) - Speed ​​= 180 ° / s. To evaluate the muscle damage was used the values of CK peak found in the post-tests shortly after exercise, 24h, 48h, 72h and 96h. To verify the sense of position, the subjects, blindfolded, should find the angle of 60° in the right knee on the isokinetic dynamometer. Was used a subtraction of the target value (60°) by the angle performed by the subjects on the day of CK peak. The normality of the sample data was verified using the Shapiro-wilk test and Pearson's correlation was applied between peak CK and significance level of 5%. RESULTS: There was a significant correlation (p = 0.014) between CK and knee position sense, with r = 0.742 classified as strong (Devore, 2006). CONCLUSIONS: the induction of muscle damage caused by eccentric exercise significantly influences the subjects' proprioception, since the higher the CK values, the greater the angular discrepancies between the expected value and the one performed by the subjects.

No Differences in Sub-Cortical Motor Region Activity for Knee Motor Control Following Anterior Cruciate Ligament Reconstruction

PURPOSE: Emerging research has indicated that anterior cruciate ligament reconstruction (ACL-R) is associated with neuroplasticity. It has been speculated that these findings may have future implications on rehabilitation and ACL-R outcomes. However, most of this research has focused on cortical plasticity rather than sub-cortical plasticity. The purpose of this project was to determine the effects of ACL-R on sub-cortical portions of the cortical-subcortical motor loop. METHODS: A healthy group of active participants (n=16, age=23.2±3.5 years, height=1.7±0.1 m, weight=69.7±14.3 kg) and a left ACL-R group (n=15, age=21.7±2.7 years, height=1.7±0.1 m, weight=70.4±15.8 kg, 38.1±27.2 months’ post-surgery) were locally recruited. Functional magnetic resonance imaging (fMRI) and T1 structural imaging were performed to analyze brain activation during a unilateral left (involved) 45° knee extension/flexion at a rate of 1.2 Hz for 4 blocks of 30 seconds interspersed with 30 seconds of rest. The right putamen and right sub-thalamic nuclei (STN) served as seed regions, and the two groups were contrasted using a mixed-effects general linear model with a priori cluster threshold of p<.05. RESULTS: Compared to the control group, the ACL-R group displayed no differences in right putamen and right STN activation during the unilateral motor task. CONCLUSION: These results indicate that ACL-R may not influence the motor control loop at the sub-cortical level. Therefore, motor control and motor learning, as it relates to the subcortical structures, may not be affected by ACL-R. As a result, neurorehabilitation after ACL-R should use priming techniques to target specific cortical regions that previous studies have indicated as being affected by ACL-R.

Effects of a Sprint Interval and Resistance Concurrent Exercise Training Program on Aerobic Capacity of Inactive Adult Women.

Salom Huffman, L, Wadsworth, DD, McDonald, JR, Foote, SJ, Hyatt, H, and Pascoe, DD. Effects of a sprint interval and resistance concurrent exercise training program on aerobic capacity of inactive adult women. J Strength Cond Res 33(6): 1641-1648, 2019-The purpose of this investigation was to examine the effects of high-intensity concurrent exercise training (CET) consisting of sprint intervals (sprint interval training [SIT]) and resistance exercise (RET) protocols on aerobic capacity in recreationally active, adult women. A total of 53 participants were pair-matched according to preliminary maximal aerobic capacity (VO2max) Bruce protocol assessment into level-grade (SIT0) or 6% incline (SIT6) groups. This 12-week intervention consisted of 3 CET sessions per week. Sprint interval protocol consisted of 2 (weeks 1-6) then 3 (weeks 7-12) sets of three 40-second sprints at specific intensities to evoke responses equivalent to 95% of age-predicted maximal heart rate interspersed with 20 seconds of rest; with 1 minute of passive recovery between sets. An undulating periodization model consisting of lifts such as the back squat and bench press constituted the RET component. Protocol order alternated each session. Posttraining revealed significant improvements in both SIT0 and SIT6 (p ≤ 0.05) for VO2max (2.11 ± 0.390 to 2.29 ± 0.382 L·min; 2.03 ± 0.382 to 2.09 ± 0.561 L·min), Tmax (490.5 ± 102.3 to 542.7 ± 81.5 seconds; 503.2 ± 75.4 to 541.8 ± 77.0 seconds), and Vmax (5.1 ± 0.92 miles per hour [MPH] to 5.9 ± 0.90 MPH; 4.3 ± 0.68 MPH to 4.9 ± 0.64 MPH), respectively. No significant between-group interactions were detected for any of the variables. Our SIT-based CET intervention represents an effective strategy to induce significant cardiovascular adaptations in older women as evident by aerobic capacity improvements, beneficial to overall health and critical for functionality into old age; an important concern for aging women.

Set Configuration in Strength Training Programs Modulates the Cross Education Phenomenon.

Fariñas, J, Mayo, X, Giraldez-García, MA, Carballeira, E, Fernandez-Del-Olmo, M, Rial-Vazquez, J, Kingsley, JD, and Iglesias-Soler, E. Set configuration in strength training programs modulates the cross education phenomenon. J Strength Cond Res 35(9): 2414-2420, 2021-This study aimed to compare the strength gains in the nontrained arm after 2 independent unilateral training programs differing in the set configuration. Thirty-five subjects were randomly assigned to 3 groups: traditional training (TT; n = 12), cluster training (CT; n = 11), or control (CON; n = 12). The experimental groups performed a 5-week training program of a unilateral biceps curl exercise with the dominant limb using the 10 repetition maximum (10RM) load. Traditional training performed 5 sets of 6 repetitions and 135 seconds of rest between sets. Cluster training completed 30 repetitions with 18.5 seconds of rest between each repetition. Anthropometry (ANT), muscle thickness (MT), 1RM, the number of repetitions with 10RM (n10RM), and isometric maximal voluntary contraction (MVC) were measured before and after the intervention. Regarding the nontrained arm, TT improved 1RM (7.3%, p < 0.001). No changes were observed in CT. Regarding the trained arm, TT improved 1RM (9.1%, p < 0.001), n10RM (p = 0.005), and MVC (p = 0.011), whereas CT only showed a trend for improvement of 1RM (3.4%, p = 0.052). These results suggest that when total volume and repetition-to-rest ratio are equated, a more fatiguing set configuration causes a higher effect on the non-trained limb.

The Investigation of the Acute Effect of Craniocervical Flexion Exercise and Local Vibration on Semispinalis Cervicis and Multifidus Muscle Activation in a Healthy Individual

Aim: The aim of this study is to investigate the acute effects of craniocervical flexion exercise (CCFE) and vibration on the activation of the semispinalis cervicis and multifidus muscles in a healthy case. Materials and Methods: Our study was carried out on a healthy male without neck pain at the age of 21 at Hacettepe University Faculty of Health Sciences, Physiotherapy and Rehabilitation Department and Hacettepe University Faculty of Medicine, Radiology Department. First, the individual was taught craniocervical flexion exercise (CCFE). Later on, cervical MR images of the 3-T magnet MRG device were taken at the National Magnetic Resonance Research Center of Bilkent University. The sections obtained from the deep paravertebral region muscles by "T2 map color mapping method" and the muscle areas of activation were drawn by observation. T2 relaxation values associated with muscle activation were calculated. Later on, case was asked to perform CCF exercise with 10 seconds of contraction and 5 seconds of rest and 20 repetitions. MRI measurements were repeated after exercise. After a resting period of forty-five minutes, the images of the paravertebral muscles were recorded with MRI again before the vibration and the neck of the case was vibrated for 5 minutes. After the vibration, the MRI measurements were repeated and compared with the results of the first measurement. Results: It has been found that the results obtained immediately after the KSF exercise and after the application of vibration have some limited variations in the activation of the deep paravertebral neck muscles when compared to the results before CCF and vibration. Conclusion: At the end of this study it was thought that the CCF exercise and the application of vibration may have a limited and positive effect on the deep paravertebral muscles and studies with different exercise protocol and vibration intensity on more cases are needed in order to clarify this effect more clearly.

The Discourse on Measuring Frequency of Tongue Strength

Iowa Oral Performance Instrument (IOPI) is an instrument used to measure tongue strength. The standard protocol of operating IOPI is three trials separated by 10-15 seconds of rest. The highest pressure of these three trials is recorded as the tongue strength. The purpose of this study was to investigate the difference of three trials. Forty-one healthy adults were taken as research subjects. Repeated-measurements analysis of covariance (RANCOVAs) was used to analyze the anterior and posterior tongue strength under four conditions: maximum isometric pressure, dry swallowing, 5c.c. and 10c.c. of water swallowing. The results showed that there were no statistically significant differences among three trials of anterior and posterior tongue strength. It is suggested that before measuring the tongue strength, the participants should be provided with the opportunity to practice, and one or two trials in formal measurements can be adopted to reduce their fatigue. Keywords: Intraoral pressure; Swallowing; Dysphagia

Influence of High- and Low-Frequency Resistance Training on Lean Body Mass and Muscle Strength Gains in Untrained Men.

Franco, CMC, Carneiro, MAS, de Sousa, JFR, Gomes, GK, and Orsatti, FL. Influence of high- and low-frequency resistance training on lean body mass and muscle strength gains in untrained men. J Strength Cond Res 35(8): 2089-2094, 2021-The aim of this study was to investigate whether high-frequency resistance training (HFRT) performs better in lean body mass (LBM) and muscle strength gains when compared with low-frequency resistance training (LFRT). Eighteen untrained males (height: 1.76 ± 0.05 m, body mass: 78.3 ± 13.5 kg, and age: 22.1 ± 2.2 years) were randomly allocated into HFRT (n = 9) and LFRT (n = 9). Muscle strength {1 repetition maximum (RM) (bench press [BP] and unilateral leg extension [LE])} and LBM (DXA) were assessed at before and after 8 weeks of training. Both groups performed 7 whole-body resistance exercises, standardized to 10 sets per week, 8-12 maximal repetitions, and 90-120 seconds of rest in a 5-day resistance training routine. The LFRT performed a split-body routine, training each specific muscle group once a week. The HFRT performed a total-body routine, training all muscle groups every session and progressed from a training frequency of once per week to a training frequency of 5 times per week. Lean body mass increased without differences between groups (HFRT = 1.0 kg vs. LFRT = 1.5 kg; p = 0.377). Similarly, 1RM increased without differences between groups (right LE, HFRT = 21.2 kg vs. LFRT = 19.7 kg, p = 0.782; BP, HFRT = 7.1 kg vs. LFRT = 4.5 kg, p = 0.293). These findings suggest that in young untrained men, progressing from a training frequency of once per week to a training frequency of 5 times per week with equated volume produces similar gains in LBM and muscle strength as a constant training frequency of once per week, over an 8-week training period.

Whole Body Vibration Elicits Differential Immune Responses Between Obese and Normal Weight Individuals

Traditional aerobic exercise decreases the risk of developing inflammatory diseases in both obese and normal weight individuals. The magnitude of the anti‐inflammatory immune response following traditional exercise is reduced and the time‐course is shorter in obese compared to normal weight individuals. Although obesity may affect the ability to engage in traditional exercise, whole body vibration (WBV) has emerged as a more tolerated alternative. The impact of WBV on immune‐mediated inflammation in obesity, however, is unknown.PURPOSETo determine if WBV elicits a differential magnitude and time‐course of immune‐mediated inflammation between obese and normal weight individuals.METHODS11 obese (OB) (BMI: 35.9 ± 8.8 kg/m2, Age: 33 ± 4 y, percent body fat (%BF): 39.1 ± 2.4%) and 12 normal weight (NW) (BMI: 21.3 ± 2.2 kg/m2, Age: 29 ± 7 y, %BF: 17.4 ± 2.1%) men and women participated in this study. Following IV insertion and a resting (PRE) blood draw, each participant performed the WBV protocol, which consisted of 10 cycles of 1 minute of WBV in a static squat position followed by 30 seconds of rest. Following completion of the WBV protocol, blood samples were obtained immediately (POST), 1 hour (1h), 3 hours (3h), and 24 hours (24h) post‐WBV. Blood was analyzed for leukocyte composition (immune‐mediated inflammation) and IL‐6 (muscle activation).RESULTSPRE leukocyte composition was not different between groups. In NW, the percentage of neutrophils decreased (1h: 62 ± 3% vs. 24h: 54 ± 3%, p=0.009) and the percentage of lymphocytes increased (1h: 28 ± 3% vs. 24h: 35 ± 2%, p=0.011). In contrast, there were no changes in leukocyte composition in OB. An association was observed between %BF and the percentage of monocytes at POST (r= −0.67, p=0.023) and 1h (r= −0.65, p=0.03) in OB, whereas in NW %BF was only correlated with percentage of monocytes at PRE (r= −0.61, p=0.045). Although IL‐6 was higher in OB compared with NW at each time point (all p&lt;0.05), a similar percent change from baseline was observed between groups for all post‐WBV time points. IL‐6 at PRE was correlated with percent change at 3h (r= −0.61, p=0.048) only in OB.CONCLUSIONWBV elicited favorable alterations in leukocyte composition over time in NW, while no change in leukocytes were detected in OB. In addition, adiposity appears to impact the timing of the leukocyte response to WBV. Although WBV provoked similar IL‐6 changes in both groups, higher concentrations of IL‐6 at PRE appeared to be related to smaller changes at 3h in OB. Taken together, these data suggest a differential inflammatory immune response to WBV exercise between obese and normal weight individuals.Support or Funding InformationSupported by Medical College of Georgia TUPP awardThis abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.

The relationship between CrossFit performance and grip strength

There is a growing interest in maximizing CrossFit (CF) performance as the sport becomes more economically viable at elite levels. The ability to delineate the physiological demands of the sport of CF allows coaches and athletes to develop more efficacious exercise programming in order to maximize the athlete’s potential for success at the most elite and lucrative levels of competition. There is also a growing interest in increasing health and fitness in the general population as obesity and chronic disease rates continue to rise. Hand grip strength (HGS) is an indicator of total body strength, mortality, morbidity and independence among aging adults. Given that CF is the “Sport of Fitness”, it would be of interest to determine the relationship between HGS and CF performance. The current study examined the relationship between CF performance and hand grip strength (HGS). It was hypothesized that CF performance would have a meaningful significant relationship with HGS. Fifteen (n=15) female CF participants (age 30.9±7.1 years, height 160.3±4.8 cm, body mass 64.5±9.6 kg) of varying experience levels (51.9±30.6 months) were assessed for HGS and CF performance measures. The CF performance measures were assessed via a Workout of the Day (WOD) comprised of 3 rounds of 30 seconds at each of the following stations: fan bike (FB) for maximum calories, air squats (AS) for maximum repetitions, sit-ups (SU) for maximum repetitions, and burpees (BP) for maximum repetitions. Each 30 second work interval was followed by 2 minutes and 30 seconds of rest to ensure full recovery of the phosphagen energy system. Scores were reported as the mean number of repetitions completed across the 3 attempts at each movement station. Individual movements as well as total repetitions were then compared to HGS with Pearson correlation coefficients (r). Sit-up performance demonstrated a positive moderately (r=0.44) significant relationship with mean HGS (p&amp;lt;0.05). Neither total WOD performance nor any other individual movement had a significant relationship with HGS (p&amp;gt;0.05). Within the parameters of this study, CF participants exhibited a moderate relationship between HGS and sit-up scores.

(234) Cortical Hemodynamic Response to Contact Thermal Stimuli in Older Adults with Knee Osteoarthritis: A Functional Near Infrared Spectroscopy Pilot Study

Since the brain is the organ that is principally responsible for processing the experiences of pain, the emergence of neuroimaging for quantifying pain-related responses is promising. Functional near-infrared spectroscopy (fNIRS) is particularly favorable for studying pain since this optical method is noninvasive, portable, and cost-effective. However, no studies have directly evaluated the cortical hemodynamic response to pain in older adults with knee osteoarthritis (OA) using fNIRS. In this pilot study, we sought to investigate the cortical response of older adults with knee OA to contact thermal stimuli. Fourteen community-dwelling adults with knee OA pain aged 50 – 85 years underwent testing. Using a blocked design paradigm consisting of 6 blocks of 20 seconds of stimuli followed by 30 seconds of rest, we applied contact thermal stimuli at 45 degree Celsius to the ventral part of the ipsilateral forearm to the most affected knee using a computer-controlled Medoc TSA-II Neurosensory Analyzer. We used a continuous wave, multichannel fNIRS imaging system (LIGHTNIRS, Shimadzu, Kyoto, Japan) incorporating three semiconductor lasers at 780, 805, and 830 nm and an avalanche photodetector in each optical channel to measure cerebral hemodynamic activity. The instrument encompasses an array of 8 sources and 8 detectors connected to the subject's scalp in a geometrical layout that covered the prefrontal and somatosensory cortex regions bilaterally. Results indicate substantial brain activation patterns in contralateral prefrontal and somatosensory regions, with differing intensity between subjects in response to the stimulus. Our findings extend the use of fNIRS imaging to older adults with knee OA, and adds to the growing literature regarding neuroimaging measures of pain using fNIRS.

Comparison of Incremental Intermittent and Time Trial Testing in Age-Group Swimmers.

Zacca, R, Azevedo, R, Peterson Silveira, R, Vilas-Boas, JP, Pyne, DB, Castro, FAdS, and Fernandes, RJ. Comparison of incremental intermittent and time trial testing in age-group swimmers. J Strength Cond Res 33(3): 801-810, 2019-The aim of this study was to compare physiological and biomechanical characteristics between an incremental intermittent test and a time trial protocol in age-group swimmers. Eleven national level age-group swimmers (6 men and 5 women) performed a 7 × 200-m incremental intermittent protocol (until exhaustion; 30-second rest) and a 400-m test (T400) in front crawl on separate days. Cardiorespiratory variables were measured continuously using a telemetric portable gas analyzer. Swimming speed, stroke rate, stroke length, and stroke index were assessed by video analysis. Physiological (oxygen uptake, heart rate, and lactate concentrations) and biomechanical variables between seventh 200-m step (in which the minimal swimming speed that elicits maximal oxygen uptake-vV[Combining Dot Above]O2max was identified) and T400 (time trial/fixed distance) were compared with a paired student's t test, Pearson's product-moment correlation, Passing-Bablok regression, and Bland-Altman plot analyses. There were high level of agreement and high correlations (r-values ∼0.90; p ≤ 0.05) for all physiological variables between the seventh 200-m step and T400. Similarly, there were high level of agreements and high correlations (r-values ∼0.90; p ≤ 0.05) for all biomechanical variables and only trivial bias in swimming speed (0.03 m·s; 2%). Primary physiological and biomechanical responses between incremental intermittent and representative time trial protocols were similar, but best practice dictates protocols should not be used interchangeably to minimize errors in prescribing swimming training speeds. The T400 is a valid, useful, and easier to administer test for aerobic power assessment in age-group swimmers.

The effects of electrically stimulating the right median nerve

Objective To explore the effect of right median nerve stimulation (RMNS) on brain function in healthy subjects . Methods Twenty-eight healthy volunteers were selected as the study′s subjects. RMNS was administered as a task stimulation in a wake-up therapy mode. The subjects were given 30 seconds of stimulation followed by 30 seconds of rest, repeated for 6 times as the block experiment designed, and functional magnetic resonance imaging (fMRI) was performed simultaneously with the task stimulation . The brain activation was analyzed using SPM 12 software. Results The fMRI showed that RMNS activated primarily the left M1, the premotor cortex (PMC), the bilateral primary and secondary somatosensory cortexes (S1 and S2), and the left insular lobe. Compared with the resting state, the intensity of BOLD signal in the above activated brain areas changed significantly in RMNS wake-up stimulation mode. Conclusion Stimulation of the right median nerve can stimulate the local cerebral cortex and produce a certain wake-up effect by activating the right brain areas related to the motor and sensory functioning of the hand. Key words: Right median nerve; Electrical stimulation; Functional magnetic resonance imaging

COMPARISON OF EPOC AND RECOVERY ENERGY EXPENDITURE BETWEEN HIIT AND CONTINUOUS AEROBIC EXERCISE TRAINING

ABSTRACT Objectives: The objective of this study was to compare EPOC - excess post-exercise oxygen consumption and recovery energy expenditure between high intensity interval aerobic exercise (HIIT) and continuous aerobic exercise in adult amateur runners. Methods: The study included 10 runners, with a mean age of 35.7 ± 5.87 years, height 1.69 ± 0.11 m; body mass 74.13 ± 11.26 kg; fat percentage 19.31 ± 4.27% and maximal oxygen consumption (VO2max) of 3.50 ± 0.64 l/kg/min-1. The continuous aerobic exercise protocol consisted of 20 minutes of running with intensity of 70-75% HRmax. Two 20-second cycles of 8 sprints were performed for HIIT at the highest possible speed, with 10 seconds of rest and a 3-minute interval between cycles. The sample group performed the two protocols at least 48 hours and at most one week apart. EPOC was observed using ergospirometry after the running protocols, and mean consumption was analyzed between 25-30 minutes after exercise. Oxygen consumption at 9-10 minutes was used for resting consumption. The study has a cross-sectional experimental design. Results: Oxygen consumption of 0.57 ± 0.29l/kg/min1 and energy expenditure of 2.84 ± 1.44 kcal/min were observed for continuous aerobic exercise, with values of 0.61 ± 0.62 l/kg/min−1 and 3.06 ± 1.10 kcal/min respectively (p &lt;0.05) for HIIT. Conclusion: The protocols performed did not show a statistically significant difference in terms of EPOC and energy expenditure, but the performance of HIIT increased lipid metabolism for exercise recovery, which may favor the weight loss process. Moreover, this activity model takes up less time. Level of evidence I, randomized clinical trial.

Perceived Exertion Is Affected by the Submaximal Set Configuration Used in Resistance Exercise.

Mayo, X, Iglesias-Soler, E, and Kingsley, JD. Perceived exertion is affected by the submaximal set configuration used in resistance exercise. J Strength Cond Res 33(2): 426-432, 2019-Previously, perceived exertion in submaximal resistance exercise protocols was reported to be affected by the intensity of load followed by work-to-rest ratio. Nevertheless, the effect of set configuration, which entails the metabolic, hormonal, and neuromuscular implication of the session, is currently unknown, despite the fact that perceived exertion discriminates these differences. We aimed to analyze the effect of 3 submaximal set configurations on perceived exertion and their relationship with velocity as a mechanical measure of fatigue. Seventeen healthy subjects (23 ± 2 years) performed with the 10-repetition maximum load on the leg press (211 ± 45 kg) a total of 40 repetitions with 720 seconds of rest in 3 randomized experimental sessions with the same work-to-rest ratio. The sessions consisted of an interrepetition rest design performing individual repetitions, a cluster design performing groups of 4 repetitions, and a traditional design performing groups of 8 repetitions. At the end of the session, the nonparametric analysis of variance-type test revealed differences between protocols (p < 0.001), with lower values of perceived exertion in the interrepetition rest design in comparison with the cluster design (p = 0.003) and traditional design (p < 0.001). In addition, Spearman's rank correlations (p < 0.001) were observed for the interrepetition rest design (rho = -0.72) and traditional design (rho = -0.8) between perceived exertion and velocity. Our findings suggest that the submaximal set configuration is a determinant of perceived exertion by itself, and that perceived exertion represents similar mechanisms as velocity, such as fatigue and certain characteristics of the session and the individual.