Isokinetic Training Research Articles

Cross-education: effects of age on rapid and maximal voluntary contractile characteristics in males.

The purpose of this study was to determine the effect of age on the cross-education of rapid and maximal contractile properties for the knee extensors. Young (n = 10; age = 21.1 ± 1.7years) and older (n = 10; age = 65.3 ± 8.3years) males performed unilateral isokinetic resistance training (RT) of the knee extensors for 4weeks. Maximal voluntary isokinetic (45°s-1 and 300°s-1) and isometric testing was conducted for the trained and untrained leg before and after RT. Peak torque (PT) and acceleration were obtained from isokinetic testing as well as torque at 30ms (TQ30) and 100ms (TQ100) from the 45°s-1 contraction. PT and rate of torque development were recorded from the isometric contractions. Independent of age, isometric PT (10.1%; p = 0.006) as well as PT and acceleration at 300°s-1 (6.7%; p = 0.008 and 4.0%; p = 0.016, respectively) increased in the untrained leg. At 45°s-1, acceleration was increased (3.6%; p = 0.021), but PT remained unchanged (p = 0.227). TQ100 increased similarly between groups (4.5%; p = 0.014), but TQ30 increased only in the older group (9.5%; p = 0.022). Cross-education of rapid and maximal contractile parameters can be achieved early during unilateral RT independent of age. These findings indicate the potential for particular unilateral RT protocols to be used for older adults in rehabilitative settings to offset disuse-related reductions in contractile function, which are most dramatic in this population.

The effect of isokinetic training on pain and function in patients with knee osteoarthritis: clinical traial

Background: Osteoarthritis (OA) is one of the prevalent diseases in joints that the Knee joint is the most frequently involved than other joint. Its been shown that these patients get quadriceps muscles weakness deficits in knee. The aim of this study is evaluation of the effect of isokinetic exercise on knee pain, stifiness and the function of joint knee in patients with knee osteoarthritis. Methods: In this clinical traits studytrial 30 women ranging from 45-65 with average knee osteoarthritis were studied in two groups of control and introversion according to America Society of Rheumatology criteria. The control group received the routine protocol treatment of knee osteoarthritis physiotherapy. The case group (as isokinetic training group) in addition to routine protocol received isokinetic training. The rate of the patients’ pain was measured by McGill pain questionnaire and their function by WOMAC questionnaire before and after implementation workouts. Results: All parameters in both isokinetic exercises and physiotherapy groups, improved after treatment process.(P<0.05). While comparsion of variation in intergroups/ between groups showed which isokinetic exercises along with physiotherapy treatment have good function in improvment and intensity of pain reduction compare of physiotherapy treatmentand (P < 0.001, P<0.001 and P=0.008). Conclusion: The increase of isokinetic exercises to physiotherapy treatment significantly enhanced functional and reduced patient’s knee pain compared to patients that are treated with physiotherapy.

Effects of Isokinetic Training on Trunk Muscle Fitness and Body Composition in World-Class Canoe Sprinters.

In canoe sprint, the trunk muscles play an important role in stabilizing the body in an unstable environment (boat) and in generating forces that are transmitted through the shoulders and arms to the paddle for propulsion of the boat. Isokinetic training is well suited for sports in which propulsion is generated through water resistance due to similarities in the resistive mode. Thus, the purpose of this study was to determine the effects of isokinetic training in addition to regular sport-specific training on trunk muscular fitness and body composition in world-class canoeists and to evaluate associations between trunk muscular fitness and canoe-specific performance. Nine world-class canoeists (age: 25.6 ± 3.3 years; three females; four world champions; three Olympic gold medalists) participated in an 8-week progressive isokinetic training with a 6-week block “muscle hypertrophy” and a 2-week block “muscle power.” Pre- and post-tests included the assessment of peak isokinetic torque at different velocities in concentric (30 and 140°s-1) and eccentric (30 and 90°s-1) mode, trunk muscle endurance, and body composition (e.g., body fat, segmental lean mass). Additionally, peak paddle force was assessed in the flume at a water current of 3.4 m/s. Significant pre-to-post increases were found for peak torque of the trunk rotators at 30°s-1 (p = 0.047; d = 0.4) and 140°s-1 (p = 0.014; d = 0.7) in concentric mode. No significant pre-to-post changes were detected for eccentric trunk rotator torque, trunk muscle endurance, and body composition (p > 0.148). Significant medium-to-large correlations were observed between concentric trunk rotator torque but not trunk muscle endurance and peak paddle force, irrespective of the isokinetic movement velocity (all r ≥ 0.886; p ≤ 0.008). Isokinetic trunk rotator training is effective in improving concentric trunk rotator strength in world-class canoe sprinters. It is recommended to progressively increase angular velocity from 30°s-1 to 140°s-1 over the course of the training period.

Isokinetic resistance training combined with eccentric overload improves athletic performance and induces muscle hypertrophy in young ice hockey players

ObjectivesTo determine the combined effects of slow isokinetic resistance training and eccentric overload and compare it to traditional resistance training on strength, power, body composition and muscle hypertrophy in young ice hockey players. DesignExperimental, randomized trial. MethodsTwenty-two resistance-trained ice hockey players (18±1year) were assigned to either isokinetic resistance training and eccentric overload (ISO/ECC; n=11) or traditional resistance training (TRAD; n=11). Participants underwent supervised progressive resistance training for 8 weeks (2–3 sessions/week) involving lower body multiple-joint exercises (heavy squats and explosive jump squats). The ISO/ECC group performed their training using a computerized robotic engine system (1080 Quantum synchro, Sweden), whereas the TRAD group performed the same resistance exercises with isotonic loading. Before and after the intervention, participants were evaluated in 1RM back squat, loaded jump squats, sprint- and jump performance, body composition and muscle thickness using ultrasound measurement. ResultsSimilar moderate increases in 1RM back squat and power output in the jump squats were found in both the ISO/ECC and TRAD groups (11–17%, P<0.01), whereas only the ISO/ECC group showed improvements in drop jump performance (9.8%, P=0.01). Moreover, similar trivial changes in body composition were observed in both groups, while only the ISO/ECC training group increased muscle thickness in the vastus intermedius (P=0.01) and rectus femoris muscles (P=0.03). ConclusionsBoth modalities effectively increased maximal strength and power output, whereas isokinetic resistance training, combined with eccentric overload, improved drop jump performance and induced greater muscle hypertrophy than traditional training in young ice hockey players.

Does Proprioception of knee improve after various forms of Training in Osteoarthritis of Knee?

The present study was aimed to investigate the role of various forms of training in improving the proprioception of the knee joint in patients with osteoarthritis of knee. Sixty participants (male and female) with knee Osteoarthritis of Grade II and III (Kellgren-Lawrence criteria) in the age range of 50–73 years were recruited from the Department of Orthopedics, Hospital Universiti Sains Malaysia. The recruited participants were taken to the Exercise and Sports science laboratory and the laboratory of School of Medical Sciences, Universiti Sains Malaysia for baseline assessment. The level of proprioception was assessed with the aid of isokinetic device BIODEX 4 System Pro. The participants were randomly categorized into four groups (Gr.) (Viz. Gr. A, Gr. B, Gr. C and Gr. D) and thus each group consisted of 18 participants. Gr. A participants received Conventional Physiotherapy consisting of strengthening exercises; stretching exercises and range of motion exercises. Gr. B received Isokinetic Training at velocities of 90° and 150°/second. Gr. C participants received EMG Biofeedback training with Mega ME 6000 device and Gr.D participants recieved a combined intervention of isokinetic training and EMG Biofeedback. The training protocol was designed for 25 -30 minutes per session; 2 sessions per week for 10 weeks (20 sessions). The assessment was done after 5th week of training (mid term) and after 10th week of training (post) following baseline assessment protocol. A follow up assessment was performed after the 14th and 18th week to assess the after effect of training. Meanwhile the participants were not given any training after the 10 week period. They were also adviced not to get engaged in any sort of physical training, exercise or sport programme. Repeated measure of ANOVA revealed that, all interventions helped in improving the proprioception of the knee joint however post hoc analyses implicated that a combined intervention of Isokinetic Training and EMG biofeedback was beneficial in enhancing proprioception than the conventional physiotherapy (P<.05).

Changes of bone metabolism markers following additional isokinetic and isotonic training and its subsequent cessation in advanced level adolescent weightlifters

Background: Physically active people present overall accelerated bone turnover. However, less is known about the effects of different types of resistance training on bone metabolism markers among adolescent weightlifters. Objective: The purpose of this study was to investigate the effects of isokinetic training versus isotonic training of rotator cuff muscles and one month of cessation of training on blood bone metabolism markers among adolescent advanced level weightlifters. Methods: Sixteen adolescent male weightlifters (age 14.88 ± 1.31 years) who represented their state in Malaysia were weight-matched and randomly assigned into two training groups: isokinetic training (FIT, n = 7) and isotonic training (TON, n = 9) groups. The experiment was conducted during the preparatory phase of the training cycle for a total of 24 sessions with three sessions per week for eight weeks using dynamometer or dumbbells. Blood samples were collected before the commencement of training, after training and one month following the cessation of training and analyzed for determining blood metabolism markers of serum osteocalcin, serum C-telopeptide of type 1 collagen (CTX-1), and serum total calcium. Results: Total calcium concentrations were not different between groups at any time, as indicated by a non-significant main effect of time (F = 1.89, p = .166) and no condition × time interaction effect (F = 0.64, p = .533). Serum osteocalcin concentrations were not different between groups at any time, as indicated by a non-significant main effect of time (F = 2.10, p = .162) and no condition × time interaction effect (F = 0.024, p = .912). Serum CTX-1 concentrations were not different between groups at any time, as indicated by a non-significant main effect of time (F = 3.12, p = .059) and no condition × time interaction effect (F = 1.59, p = .221). Conclusions: No significant changes were observed in serum total calcium, osteocalcin and CTX-1 following either eight weeks of isokinetic or isotonic additional training among advanced level of adolescent weightlifters.

An investigation of Eccentric Versus Concentric Resistance Training on Strength by Movement Velocity and Training Type

It is known that high intensity dynamic resistance training which involves eccentric and concentric contractions is one of the effective method for maximizing strength. Although, it is postulated that eccentric and concentric contractions provide different physiological adaptations, previous studies comparing the short-term effects of these two contractions have reported contradictory findings, with some studies reporting greater strength development with eccentric, some with concentric and some with similar within both training (18). Methodological differences may be of critical importance to the reported different findings, when focusing on the underlying reasons for these effects are discussed. The majority of previous studies on this topic have used isokinetic equipment to compare eccentric with concentric training, however there are also several studies which used isotonic method which is the most common type of resistance training. Since the effects of these two methods can form different physiological adaptations (9), it may not be proper to review the studies related to eccentric and concentric comparisons without taking into account training method variable. In isokinetic, contraction velocity can be controlled by the dynamometer however it is hard to standardize the movement velocity of isotonic training. And also previous studies showed that movement velocity of resistance training may affect strength development (11). At this juncture, the aim of this paper was to review the studies investigating eccentric and concentric resistance training and discuss the reported findings by considering methodological differences (training type and movement velocity). Although it was difficult to present certain implications due to only few studies including same methods in terms of contraction types and training methods, some highlights from this paper can be very informative to further studies. One of them is that the effects of eccentric and concentric resistance training might be different according to training types. The effects of movement velocity of resistance training on strength may also be different in terms of isotonic or isokinetic training methods .

Modifiability of the history dependence of force through chronic eccentric and concentric biased resistance training.

The increase and decrease in steady-state isometric force following active muscle lengthening and shortening are referred to as residual force enhancement (RFE) and force depression (FD), respectively. The RFE and FD states are associated with decreased (activation reduction; AR) and increased (activation increase; AI) neuromuscular activity, respectively. Although the mechanisms have been discussed over the last 60 years, no studies have systematically investigated the modifiability of RFE and FD with training. The purpose of the present study was to determine whether RFE and FD could be modulated through eccentric and concentric biased resistance training. Fifteen healthy young adult men (age: 24 ± 2 yr, weight: 77 ± 8 kg, height: 178 ± 5 cm) underwent 4 wk of isokinetic dorsiflexion training, in which one leg was trained eccentrically (-25°/s) and the other concentrically (+25°/s) over a 50° ankle excursion. Maximal and submaximal (40% maximum voluntary contraction) steady-state isometric torque and EMG values following active lengthening and shortening were compared to purely isometric values at the same joint angles and torque levels. Residual torque enhancement (rTE) decreased by ~36% after eccentric training ( P < 0.05) and increased by ~89% after concentric training ( P < 0.05), whereas residual torque depression (rTD), AR, AI, and optimal angles for torque production were not significantly altered by resistance training ( P ≥ 0.05). It appears that rTE, but not rTD, for the human ankle dorsiflexors is differentially modifiable through contraction type-dependent resistance training. NEW & NOTEWORTHY The history dependence of force production is a property of muscle unexplained by current cross bridge and sliding filament theories. Whether a muscle is actively lengthened (residual force enhancement; RFE) or shortened (force depression) to a given length, the isometric force should be equal to a purely isometric contraction-but it is not! In this study we show that eccentric training decreased RFE, whereas concentric training increased RFE and converted all nonresponders (i.e., not exhibiting RFE) into responders.

CORRELATION BETWEEN ECCENTRIC TRAINING AND FUNCTIONAL TESTS IN SUBJECTS WITH RECONSTRUCTED ACL

ABSTRACT Introduction: Eccentric training and jump tests are widely used to recover and measure deficits in knee strength and functionality after anterior cruciate ligament (ACL) reconstruction. Objective: To correlate knee extension and flexion torque generated by eccentric isokinetic training, with functional jump tests in subjects with reconstructed ACL. Method: Sixteen men with unilateral ACL reconstruction were assessed before and after 12 weeks of eccentric isokinetic training of knee flexors and extensors (3×10 MVC, 2x/week) at 30°/s for extension and flexion torque (isometric; concentric and eccentric at 30 and 120°/s) and functional jump tests (single, triple, cross and figure of 8). Inter- and intra-limb pre- and post-training mean peak torque (MPT), distance and jump test times were compared along with the correlations between these variables, considering P&lt;0.05. Results: The affected limb (AL) showed significant gain of extension and flexion torque (P&lt;0.01) in the different test categories and velocities evaluated. In the non-affected limb (NAL), this only occurred in the eccentric category (30 and 120°/s), in the extension (P&lt;0.01) and flexion (P&lt;0.05 and P&lt;0.01) torques, respectively. In the jumps, there was an increase in distance (single and triple; P&lt;0.05) and a decrease in time (crossed and figure of 8; P&lt;0.01), however, MPT x Jump correlations were weak (r&lt;0.3) in the pre and post-training period in both limbs. Conclusion: Despite the gain in knee extension and flexion torque and jumping performance, the expected correlation was not satisfactory, suggesting that knee functionality involves other variables inherent to motor control. Level of Evidence IV; Type of study: Case series.

Time course of neuromechanical and morphological adaptations to triceps surae isokinetic eccentric training

ObjectivesTo document the magnitude and the time course of neuromechanical and morphological adaptations in response to a triceps surae eccentric training program. MethodsTwenty healthy male subjects completed a control period followed by a 12-week isokinetic eccentric training program. Triceps surae neuromechanical and morphological evaluations were performed every 4 weeks. ResultsThe training program led to increases in: eccentric (32%), isometric (13%) and concentric (20%) torques; eccentric (32%) and isometric (24%) electromyographic activity; and, muscle thickness (14%). Torque and muscle thickness increased until the 8th training week. Eccentric and isometric activation increased until the 4th training week. No change was found in concentric activation. The angles of peak torque in eccentric and concentric tests shifted towards longer muscle lengths. While eccentric and isometric strength gains are explained by increased neural activation and muscle mass, changes in concentric torque are not related to neural effects. ConclusionsEccentric training led to increases in maximum eccentric and isometric force production due to adaptations in muscle activation and muscle mass. Among the advantages of the shift in the optimal length for force production towards longer lengths, are the increased total joint range of motion and a lower predisposition for muscle strain injuries.

Effects of isokinetic eccentric versus traditional lower body resistance training on muscle function: examining a multiple-joint short-term training model.

Early adaptations in eccentric training show several advantages over those in concentric training. The purpose of this study was to quantify the effects of 4 weeks of multiple-joint eccentric versus traditional leg press (TLP) training on muscle strength, rate of torque development (RTD), and jump and sprint performance adaptations. Twenty-six resistance-trained adults performed either an eccentric or a TLP resistance-training program twice per week for 4 weeks. Single-joint isometric maximal and rapid strength (peak torque and RTD, respectively) and isokinetic strength of the knee extensors and flexors, multiple-joint eccentric strength, leg press strength (1-repetition maximum), 40-m sprint, and vertical and long jump were measured before, at the midpoint, and after a 4-week training period. Four weeks of isokinetic multiple-joint eccentric training elicited greater test-specific strength gains (effect size (ES) = 1.06) compared with TLP training (ES = 0.11). The eccentric group also yielded moderate improvements in the middle-late phase RTD (RTD100-200; ES = 0.51 and 0.54 for the knee flexors and extensors, respectively), whereas the TLP group showed small-moderate improvements (ES = 0.37). The majority of the single-joint strength variables showed negligible improvements. Performance tests showed no (broad jump) to small (vertical jump; sprint for the leg press) improvements. Multiple-joint eccentric training induced significant improvements in lower body strength in a short amount of time in a recreationally trained population. These accelerated adaptations along with the lower energy requirements of eccentric exercise, may be useful for clinicians or practitioners when prescribing training programs for those who are injured, sedentary, or elderly as a means to elicit time- and metabolically efficient muscle function improvements.

Intervention time and course of the treatment of isokinetic strength training have a different impact on walking function in elder stroke patients with hemiplegia

Intervention time and course of the treatment of isokinetic strength training have a different impact on walking function in elder stroke patients with hemiplegia. Picking up 63 elder stroke patients from department of rehabilitation in the first hospital of Jilin university with hemiplegia and randomly divided into A group, B group and C intervention group. On the basis of routine rehabilitation therapy, the patients in A group were given isokinetic strength training in the first 4 weeks. After 4 weeks, the patients were given general anti-muscular strength training. In B group, the patients were given normal resistance training at first 4 weeks, after 4 weeks to give isokinetic strength training. The C group of patients were given 8 weeks isokinetic strength training. Using PT, BBS, FMA, FAC, and MBI to evaluate the function before treatment, at 4 and 8 weeks. After 4 weeks of treatment, the PT, BBS, FMA, FAC and MBI scores of A group were (31.47 ± 9.65/45.68 ± 11.86), (38.42 ± 8.03), (15.23 ± 3.65), (2.31 ± 0.51), (52.19 ± 11.43), and the scores of C group were (32.82 ± 8.52/46.37 ± 12.02),(37.86 ± 7.73), (14.91 ± 3.58), (2.26 ± 0.53), (51.88 ± 10.93), which were significantly better than those of B group ( P < 0.05), but there was no significant difference between the A and C group ( P > 0.05). After 8 weeks, the scores of the three groups were significantly improved compared with after four weeks treatment ( P < 0.05). The PT, BBS, FMA, FAC and MBI scores of A group were (35.61 ± 9.72/53.48 ± 14.63), (42.29 ± 8.61), (19.37 ± 4.05), (3.57 ± 0.63), (63.76 ± 12.15), and the scores of C group were (44.71 ± 12.34/58.86 ± 15.20), (46.37 ± 9.02), (22.19 ± 4.24), (4.02 ± 0.68), (70.23 ± 13.19), which were significantly better than those of B group ( P < 0.05), and the C group were significantly better than A group, the difference was statistically significant ( P < 0.05). Early, whole course intervention of isokinetic strength training can be more effective in improving muscle strength, walking function and ADL of the elder stroke patients with hemiplegia.

Cross-education improves quadriceps strength recovery after ACL reconstruction: a randomized controlled trial.

The aim of this study was to investigate the effects of concentric and eccentric cross-education (CE) on quadriceps strength and knee function recoveries after anterior cruciate ligament (ACL) reconstruction. Forty-eight patients (age: 29.5 ± 6.8 years, body mass index: 26.1 ± 3.2kg/m2) who had undergone ACL reconstruction with hamstring tendon autograft were included in the study. The patients were randomly divided into three groups when they reached four weeks post surgery: (1) concentric CE (n = 16); (2) eccentric CE (n = 16); and (3) control (n = 16). All groups followed the same post-surgical rehabilitation program for their reconstructed limb. Additionally, the two experimental groups followed eight weeks of isokinetic training for the uninjured knee at 60°/s for 3 days per week. Quadriceps maximum voluntary isometric strength (MVIC) was measured during the 4th week (pre-training), 12th week (post training), and 24th week post surgery. The single-leg hop distance and International Knee Documentary Committee (IKDC) scores were also evaluated during the 24th week post surgery. Analysis of variance was used for statistical analysis. Group-by-time interaction was significant for quadriceps MVICs for reconstructed and healthy limbs (p = 0.02). Quadriceps strength of both knees was greater in concentric and eccentric CE groups compared to control group during the 12th- and 24th weeks post surgery (p < 0.05). Strength gain was 28% and 31% in concentric and eccentric CE groups, respectively, when compared with the control group. Concentric and eccentric CE had similar effects on quadriceps strength recovery (n.s.). IKDC score, and single-leg hop distances were not significantly different among groups (n.s.). Concentric and eccentric quadricep strengthening of healthy limbs in early phases of ACL rehabilitation improved post-surgical quadriceps strength recovery of the reconstructed limb. CE should be integrated into ACL reconstruction rehabilitation, especially in the early rehabilitative phases to restore quadriceps strength. Randomized controlled trial, Level I.

ERIK: an isokinetic exercise device for the lower limbs

In the current study, we tested a prototype of an isokinetic exercise device for the lower limbs, named the ERIK. The ERIK enables a type of single-limb squat exercise with a translational load on the swing leg in a closed kinetic chain, putting load on the muscles of the stance leg in the standing position. This training applies load to the gluteal muscles, which is effective for avoiding excessive knee valgus moment, a major factor in anterior cruciate ligament injuries. To enhance the quality of the load, an electro-rheological (ER) fluid brake system is implemented in the ERIK. The ER brake can reversibly control resistive torque with a rapid response. This paper reports a prototype of the device with four training modes, verifying its performance through basic experiments. Although high resistance is created within a wide motion area and requires isokinetic training by controlling the velocity of the trainee’s legs, the ERIK has the advantage of a high level of safety because of its passive resistive function.

Different Muscle Action Training Protocols on Quadriceps-Hamstrings Neuromuscular Adaptations.

The aim of this study was to compare three specific concentric and eccentric muscle action training protocols on quadriceps-hamstrings neuromuscular adaptations. Forty male volunteers performed 6 weeks of training (two sessions/week) of their dominant and non-dominant legs on an isokinetic dynamometer. They were randomly assigned to one of four groups; concentric quadriceps and concentric hamstrings (CON/CON, n=10), eccentric quadriceps and eccentric hamstrings (ECC/ECC, n=10), concentric quadriceps and eccentric hamstrings (CON/ECC, n=10), or no training (CTRL, n=10). Intensity of training was increased every week by decreasing the angular velocity for concentric and increasing it for eccentric groups in 30°/s increments. Volume of training was increased by adding one set every week. Dominant leg quadriceps and hamstrings muscle thickness, muscle quality, muscle activation, muscle coactivation, and electromechanical delay were tested before and after training. Results revealed that all training groups similarly increased MT of quadriceps and hamstrings compared to control (p<0.05). However, CON/ECC and ECC/ECC training elicited a greater magnitude of change. There were no significant differences between groups for all other neuromuscular variables (p>0.05). These findings suggest that different short-term muscle action isokinetic training protocols elicit similar muscle size increases in hamstrings and quadriceps, but not for other neuromuscular variables. Nevertheless, effect sizes indicate that CON/ECC and ECC/ECC may elicit the greatest magnitude of change in muscle hypertrophy.

Impact of Isokinetic training on pain in patients’ with Knee osteoarthritis-A Meta-analysis

The incidence of osteoarthritis has been alarming over the years due to increase in the proportion of the aged people. Osteoarthritis has been commonly found to affect the knee joint, the most important joint in the context of weight bearing function of the lower limb. Cartilage destruction and subchondral bone erosion along with other entities affecting the entire structure of the knee are associated with osteoarthritis. Isokinetic training has been used to train athletes and to measure the function of the muscles for almost 5 decades. It has found its application in assessment and training of patients with various disorders. Osteoarthritis of knee is one such disorder where the application of the isokinetic training has been increasing over the years. There have been controversies over the effect of isokinetic training in patients with osteoarthritis of knee. Hence the magnitude of the effect of isokinetic training on functional parameters in patients with osteoarthritis of knee needs to be evaluated. A thorough online literature search was done on Web of Science, ProQuest, PubMed, Ebscohost, CINAHL between 1990 and 2014. Ten articles measuring the effect of isokinetic training on osteoarthritis of knee were included and methodologically assessed. Data from the trials were extracted based on the demographic characteristics, outcomes measured, isokinetic training protocol and the other interventions used. Standardized effect sizes with 95%confidence interval (CIs) were calculated from the preintervention and post intervention means of the isokinetic training group and other intervention group. About 10 studies were included in the review and 9 articles were analysed for reduction in pain. Isokinetic training was not so beneficial in reducing the pain associated with osteoarthritis. Since there was so much of heterogeneity among the studies the result of the analysis should be inferred with caution. Yet there is no definitive evidence to confirm the effects of isokinetic training on osteoarthritis of knee.

Effect of isokinetic training on quadriceps muscle strength in osteoarthritis of knee

The aim of the present study was to investigate the role of Isokinetic Training and Electromyography biofeedback training in improving strength of the quadriceps femoris in participants with Osteoarthritis of knee. Fifty four participants (male and female) in the age range of 50–63 years with knee Osteoarthritis of Grade II and III (Kellgren-Lawrence criteria) severity were recruited from the Department of Orthopedics, Hospital Universiti Sains Malaysia. The selected participants were taken to the Exercise and Sports science laboratory and the laboratory of School of Medical Sciences, Universiti Sains Malaysia for baseline assessment. Extent of muscle strength was assessed employing the isokinetic device BIODEX 4 System Pro. On completion of the baseline assessment the participants were randomly categorized into three groups (Gr.) (Viz. Gr. A, Gr. B, Gr. C and Gr. D) and thus each group consisted of 18 participants. Gr. A participants received Conventional Physiotherapy consisting of strengthening exercises; stretching exercises and range of motion exercises. Gr. B received Isokinetic Training at velocities of 90° and 150°/second. Gr. C participants received EMG Biofeedback training with Mega ME 6000 device. All the interventions were imparted for 25–30 minutes per session; 2 sessions per week for10 weeks (20 sessions). Mid intervention assessment was done after 5th week followed by the post intervention assessment after 10th week following baseline assessment protocol. After the post intervention assessment, the participants were instructed not to attend the training session for the next 8 weeks and not to get engaged in any sort of physical training, exercise or sport programme. The issue of sustainability was also verified by the post-follow-up assessments of the all of the variables following identical assessment protocols after 14th and 18th week of completion. Repeated measure of ANOVA revealed that, Isokinetic Training was beneficial in enhancing muscle-strength of quadriceps femoris (p<.05).

Study of isokinetic strength training's rehabilitating effects on elite athletes after knee joint ACL reconstruction surgery

Anterior cruciate ligament (ACL) injury is one of the most common knee injuries for most athletes and sports-active people. Arthroscopic reconstruction is the preferred treatment. Rebuilding ACL for the rapid return to pre-injury level movement and function is an important goal for athletes. In this paper, the use of isokinetic strength training methods for athletes after ACL injury rehabilitation effect is reported. Thirty-one knee anterior cruciate ligament reconstruction athletes were divided into two groups and were respectively subjected to 12 weeks' traditional rehabilitation training and isokinetic strength training. It was found that constant strength training of the knee joint could improve the muscle strength of the athletes more quickly which provides better rehabilitation training for the postoperative recovery of athletes to return to the track.

Effects of Isokinetic versus Isotonic Training and its Cessation on Total Leukocytes and Lymphocytes Count in Adolescent State-level Weightlifters.

Background:The study investigated the effects of isokinetic versus isotonic training among adolescent state-level weightlifters in terms of total leukocytes, total lymphocytes, and its subsets following 24 sessions of training program and a month following training program cessation.Methods:Nineteen adolescent state-level weightlifters were assigned into isokinetic or isotonic groups. All participants were recruited from a pool of weightlifters with standardized training program provided by their coach. Series of immunological tests were carried out before the commencement, immediately upon the completion, and a month after the cessation of the additional training program to evaluate total leukocytes and lymphocytes count.Results:The results revealed a significant time and group interaction and main effects of time on mean total leukocytes (P < 0.05). Mean total leukocytes count at posttest decreased in both groups. In isotonic group, it was further decreased following 1 month of training cessation (P < 0.05) but not in the isokinetic group. However, the decrement was not high and the values were in the normal range. No significant time and group interaction was observed in total lymphocytes and its subsets count.Conclusions:Eight weeks of isokinetic and isotonic additional training with emphasis on shoulder joint only affect mean total leukocytes count in state-level adolescent weightlifters.

Study of isokinetic strength training's rehabilitating effects on elite athletes after knee joint ACL reconstruction surgery

Study of isokinetic strength training's rehabilitating effects on elite athletes after knee joint ACL reconstruction surgery