Isokinetic Training Group Research Articles

Combining intensive rehabilitation with a non-functional isokinetic strengthening program in adolescents with cerebral palsy: a study protocol for a randomized controlled trial.

Cerebral palsy (CP) is the most common brain injury in the pediatric population. CP patients present different affectations such as decreased muscle strength, gait deviations, impaired proprioception, and spasticity. Isokinetic strengthening programs combined with an intensive rehabilitation may improve muscle strength and therefore gait efficiency. Clinical Trials: The protocol has been accepted by the French National Ethics Committee (IDRCB: 2022-A00431-42). The primary aim of this randomized controlled trial is to compare the effect of an intensive rehabilitation combined with a non-functional isokinetic progressive strengthening program to an intensive rehabilitation alone on gait parameters and muscle strength in CP patients. Another goal of the current study is to determine whether adding an isokinetic program to an intensive rehabilitation is more effective than an intensive reha-bilitation alone on decreasing spasticity and improving joint position sense in CP patients. Thirty adolescents with spastic diplegia CP (GMFCS level I to III) will be randomized, by an independent researcher, into a 3-week intensive rehabilitation and isokinetic pro-gressive strengthening group or an intensive rehabilitation control group. Gait param-eters, muscle strength, spasticity and knee joint position sense will be assessed. These variables will be evaluated at baseline (T0) and at the end of the intervention (T1). The intensive rehabilitation will consist of physiotherapy sessions twice a day and hydro-therapy and virtual reality gait training once a day. The isokinetic training group will have a total of 9 supervised isokinetic strength training focusing on knee flexors and extensors with different execution speeds. The protocol has been accepted by the French National Ethics Committee in October 2022. Inclusion of patients will start in November 2022. The combination of an intensive rehabilitation with an isokinetic program on knee flexors and extensors have not been studied yet. The findings of this study may determine if an isokinetic strength training program of knee flexors and extensors is benefic to improve gait parameters, muscle strength, spasticity, and joint position sense in adolescents with spastic diplegia. The protocol has been accepted by the French National Ethics Committee (IDRCB: 2022-A00431-42).

Isokinetic training enhanced by kinesio tape for quadriceps muscle weakness post lower limb healed burn

Objective: To investigate the effect of isokinetic training enhanced by Kinesio tape (KT) on weak quadriceps muscle following healed lower limb burn. Design: A double-blinded, randomized, controlled trial. Setting: Outpatient, Kasr El Aini Hospital, and Orabi Hospital. Participants: Sixty patients with weak quadriceps of dominant lower limb following healed partial thickness burn. Thirty to forty percent of their total body surface area (TBSA) was affected by burn including the anterior thigh. They were distributed randomly into two groups; the isokinetic training and Kinesio tape group, and the isokinetic training group. Intervention: group (A); 30 patients who received isokinetic training (concentric and eccentric contraction exercises) of the quadriceps muscle (dominant side) at an angular velocity of 90°/s, three times per week, and Kinesio tape was applied twice per week, group (B): 30 patients who received isokinetic training in the form of (concentric and eccentric contraction exercises) of the quadriceps muscle (dominant side) at an angular velocity of 90°/s, three times per week. All groups were evaluated pre-treatment and after 8 weeks from the beginning of the treatment.

The Effects of Short-Term Resistance Training and Subsequent Detraining on Neuromuscular Function, Muscle Cross-Sectional Area, and Lean Mass

PurposeTo examine and compare the effects of three days of dynamic constant external resistance (DCER) and isokinetic (ISOK) training and subsequent detraining on thigh muscle cross-sectional area (TMCSA) and thigh lean mass (TLM), ISOK peak torque (PT), DCER strength, isometric force, muscle activation, and percent voluntary activation (%VA).MethodsThirty-one apparently-healthy untrained men (mean ± SD age = 22.2 ± 4.2 years; body mass = 77.9 ± 12.9 kg; height = 173.9 ± 5.4 cm) were randomly assigned to a DCER training group (n = 11), ISOK training group (n = 10) or control (CONT) group (n = 10). Subjects visited the laboratory eight times. The first visit was a familiarization session, the second visit was a pre-training assessment, the subsequent three visits were for unilateral training of the quadriceps (if assigned to a training group), and the last three visits were the post-training assessments conducted at three days, one week, and two weeks after training ended.ResultsDCER strength increased from pre- to post-training assessment 1 in both limbs for the DCER group only, and remained elevated during post-training assessments 2 and 3 (P < 0.05). In addition, surface EMG for the biceps femoris was higher at post-training assessment 3 than at the pre-training assessment, and post-training assessments 1 and 2 (P < 0.05). No other training-related changes were found.ConclusionThe primary finding of this study was that DCER strength of the trained and untrained limbs can be increased with three days of training. This has important implications for injury rehabilitation, where in the initial period post-injury strength gains on an injured limb can possibly be obtained with short-term contralateral resistance training.

The Effects of Isokinetic and Functional Training on Strength and Ability to Perform Daily Activities in Knee Osteoarthritis Patients

Introduction: Despite the well-known fact that exercises are the effective treatment in OA, exact modalities, amount and types of exercise that would be beneficial and not destructive to the affected joint are unknown and most effective types and combinations of exercise and the amount of those are still unclear. Study objectives included assessing the effects of Isokinetic Training (IT) and Functional Task Training (FT) on the peak torque at various angular velocities, pain, ability to perform daily activities and basic functional mobility in osteoarthritis patients.&#x0D; Materials and Methods: Eligible 48 patients (considering possible dropouts) who fulfilled the criteria were selected and randomly assigned to isokinetic training (IT) functional training (FT) and control with no exercise (CG) groups to participate in an intervention program involving baseline, mid- (6 weeks) and post- intervention (12 weeks) assessment through isokinetic testing to assess patient’s quadriceps peak torque at 90°/s, 120°/s and 180°/s angular velocities; WOMAC physical function questionnaire to assess patient’s pain, stiffness and ability to perform daily activities; timed up and go test (TUG) to assess subjects’ basic functional mobility.&#x0D; Results: Both training modalities improved patient’s strength, pain, and ability to perform daily activities and basic functional mobility with significant improvements at mid- and post-tests as compared to controls. FT group has equaled IT group in strength gains at every tested angular velocity, FT group was significantly superior in physical function.&#x0D; Conclusion: Both interventions brought significant improvements in studied variables with FT group emerging superior in physical function domain.

THE EFFECT OF PHYSICAL EXERCISE ON THE REHABILITATION QUALITY OF HUMAN WAIST DYSFUNCTION

ABSTRACT Introduction Human motor dysfunction can affect the quality of life, especially waist dysfunction. And an effective means to improve muscle strength during exercise. Object This article compares and analyzes the effectiveness of human muscle exercise on the decline in quality of life caused by motor dysfunction. Method The article divides patients with motor dysfunction into trunk isokinetic training group (experimental group) and waist and abdominal muscle functional training group (control group), and comparative analysis of related indicators before and after treatment. Results Before treatment, the specific indicators of the two were different (P&gt;0.05). After treatment, the patients’ quality of life indicators and motor function indicators were significantly different (P&lt;0.05). Conclusion Exercise has an obvious curative effect for patients with human motor dysfunction, and it is worthy of clinical promotion. Level of evidence II; Therapeutic studies - investigation of treatment results.

The Effects of Upper Extremity Isokinetic Strengthening in Post-Stroke Hemiplegia: A Randomized Controlled Trial

ObjectiveThe aim of this study was to evaluate the efficacy of isokinetic strengthening in paretic upper extremity among patients with post-stroke hemiplegia. MethodsHemiplegic patients with at least 6 months post-stroke and those with arm and hand Brunnstrom motor recovery stage ≥ 3 were included to the study. Patients were randomized into two groups. Isokinetic training group received 4 weeks (3 days/week) of isokinetic strengthening, while the control group was tailored strengthening exercises with exercise bands. Outcome measures were the isokinetic peak torque of wrist flexor and extensors, Fugl-Meyer Assessment of upper extremity, Stroke Impact Scale (SIS), Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire, hand grip strength, peak isometric strength of wrist flexor and extensors. Outcome measures were evaluated before treatment, after treatment (at the end of week 4) and 4 weeks after the end of treatment (at the end of week 8). The trial was registered at ClinicalTtrials.gov (ID: NCT03834311). ResultsAfter 4 weeks, changes in extensor peak torque at 60°/sn (p=0.007) and extensor peak isometric muscle strength (p=0.007) were higher in the isokinetic group (n=12) than those in the control group (n=12). At the end of week 8, only DASH score revealed a significantly higher improvement in the isokinetic group than that in the control group (p=0.014). ConclusionsIsokinetic strengthening may provide motor and functional improvement in paretic upper extremity among patients with post-stroke hemiplegia.

Isokinetic training - its radiographic and inflammatory effects on chronic low back pain: A randomized controlled trial.

Background:Isokinetic training (IKT) and core stabilization training (CST) are commonly used for balance training in musculoskeletal conditions. The knowledge about the effective implementation of these training protocols on radiological and biochemical effects in university football players with chronic low back pain (LBP) is lacking.Objective:To find and compare the effects of isokinetic training and CST on radiological and biochemical effects in university football players with chronic LBP.Design:Randomized, double-blinded controlled study.Setting:University hospital.Participants:60 LBP participants were randomized into isokinetic group (IKT; n = 20), core stabilization group (CST; n = 20) and the control group (n = 20) and received respective exercises for 4 weeks.Outcome measures:Radiological (muscle cross sectional area & muscle thickness) and biochemical (C-reactive protein, tumor necrosis factor -α, interleukin [IL]-2, IL-4, IL-6) values were measured at baseline and after 4 weeks (immediate effect).Results:The reports of the IKT, CST and control group were compared between the groups. Four weeks following training IKT group shows more significant changes in muscle cross sectional area (Psoas Major, Quadratus Lumborum, Multifidus and Erector Spinae muscles) and muscle thickness (Multifidus) than CST and control groups (p < 0.001). Biochemical measures such as C-reactive protein, tumor necrosis factor -α, IL-2, IL-4 and IL-6 also show significant improvement in IKT group than the other 2 groups (P < .001).Conclusion:Training through Isokinetic is an effective treatment program than conventional exercise programs in the aspect of radiological and biochemical analysis in university football players with chronic LBP, which may also help to prevent further injury. The present study can be used to improve the physical therapist's knowledge and clinical decision skills on LBP in football players.

Isokinetic back training is more effective than core stabilization training on pain intensity and sports performances in football players with chronic low back pain: A randomized controlled trial.

Background:Isokinetic training (IKT) and core stabilization training (CST) are commonly used for balance training in musculoskeletal conditions. The knowledge about the effective implementation of these training protocols on sports performances in university football players with chronic low back pain (LBP) is lacking.Objective:To find and compare the effects of IKT and CST on sports performances in university football players with chronic LBP.Design:Randomized, double-blinded controlled study.Setting:University hospital.Participants:Sixty LBP participants divided into isokinetic group (IKT; n = 20), core stabilization group (CST; n = 20), and the control group (n = 20) and received respected exercises for 4 weeks.Outcome measures:Clinical (pain intensity and player wellness) and sports performances (40 m sprint, 4 × 5 m sprint, submaximal shuttle running, counter movement jump, and squat jump) scores were measured at baseline, after 4 weeks, 8 weeks, and 3 months.Results:Four weeks following training IKT group shows more significant changes in pain intensity and player wellness scores than CST and control groups (P ≤ .001). Sports performance variables (40 m sprint, 4 × 5 m sprint, submaximal shuttle running, counter movement jump and squat jump) scores also show significant improvement in IKT group than the other 2 groups (P ≤ .001).Conclusion:This study suggests that training through IKT improves pain intensity and sports performances than CST in university football players with chronic LBP.

Effects of isokinetic knee muscle training on bone morphogenetic proteins and inflammatory biomarkers in post-traumatic osteoarthritis after anterior cruciate ligament injury: A randomized trial.

To determine the effects of isokinetic training of the knee muscles on bone morphogenetic proteins and inflammatory biomarkers in post-traumatic osteoarthritis after anterior cruciate ligament injury in university football players. A total of 60 participants with post-traumatic osteoarthritis after anterior cruciate ligament injury were randomly allocated into 3 groups: isokinetic training (n = 20), sensory motor training (n = 20) and control (n = 20) groups. The groups underwent different training programmes for 4 weeks. Clinical and biochemical values were measured at baseline, 4-week, 8-week and 6-month follow-ups. Four weeks after training the isokinetic group showed more significant changes in pain intensity and functional disability than the sensory motor training or control groups (p < 0.001). There was no significant improvement in bone morphogenic protein measures, (e.g. bone morphogenic proteins 2, 4, 6, and 7) in any of the groups. There was an improvement in inflammatory markers (CRP, TNF-α, IL-2, IL-4, IL-6) in the isokinetic training group compared with the other 2 groups (p < 0.001). Isokinetic training results in greater improvements in pain and functional disability than sensory motor training in post-traumatic osteoarthritis after anterior cruciate ligament injury in university football players. The isokinetic training programme had a beneficial effect on levels of inflammatory biomarkers and negligible effect on bone morphogenic proteins.

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.

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.

The effect of open kinetic chain knee extensor resistance training at different training loads on anterior knee laxity in the uninjured

BackgroundThe commonly used open kinetic chain knee extensor (OKCKE) exercise loads the sagittal restraints to knee anterior tibial translation. ObjectiveTo investigate the effect of different loads of OKCKE resistance training on anterior knee laxity (AKL) in the uninjured knee. Study designnon-clinical trial. MethodsRandomization into one of three supervised training groups occurred with training 3 times per week for 12 weeks. Subjects in the LOW and HIGH groups performed OKCKE resistance training at loads of 2 sets of 20 repetition maximum (RM) and 20 sets of 2RM, respectively. Subjects in the isokinetic training group (ISOK) performed isokinetic OKCKE resistance training using 2 sets of 20 maximal efforts. AKL was measured using the KT2000 arthrometer with concurrent measurement of lateral hamstrings muscle activity at baseline, 6 weeks and 12 weeks. ResultsTwenty six subjects participated (LOW n = 9, HIGH n = 10, ISOK n = 7). The main finding from this study is that a 12-week OKCKE resistance training programme at loads of 20 sets of 2RM, leads to an increase in manual maximal AKL. ConclusionsOKCKE resistance training at high loads (20 sets of 2RM) increases AKL while low load OKCKE resistance training (2 sets of 20RM) and isokinetic OKCKE resistance training at 2 sets of 20RM does not.

Comparison of the Effects between Isokinetic and Isotonic Strength Training in Subacute Stroke Patients

The goal of the study was to compare the effects of isokinetic and isotonic strengthening program on the changes of muscle strength, functional capacity, life quality, and inflammatory cytokines in hemiparetic patients within 6months of stroke attack. Thirty-one participants were randomly assigned into either isotonic training group or isokinetic training group. Both training programs were carried out 5 days a week for a total of 4 weeks. Outcome measures included the peak isometric torque of knees at 90° flexion, the peak torque of knees extension and flexion at angular velocities 60°/s and 120°/s, Short Form 36 (SF-36) Health Survey Questionnaire, Timed Up and Go test, and inflammatory cytokines including high sensitivity C-reactive protein, interleukin-6, and tumor necrosis factor-α. Seven patients were not able to complete the training program and were excluded from our study. The results from the remaining 24 patients showed that there were more peak torque, and SF-36 items significantly improved in the isokinetic training group compared with the isotonic group. The Timed Up and Go test and interleukin-6 were improved in both groups, but tumor necrosis factor-α was improved in only the isokinetic group. There were no significant differences between the improvements of the 2 groups except the isokinetic flexion torque at 60°/s and 120°/s. Early strengthening exercise is important for subacute stroke patients, and isokinetic program, if accessible, can bring more significant benefits forthem.

Effects of short‐term resistance training and subsequent detraining on the electromechanical delay

The purpose of this study was to examine and compare the effects of 3 days of dynamic constant external resistance (DCER) and isokinetic (ISOK) training and subsequent detraining on the electromechanical delay (EMD). Thirty-one men [age 22.2 ± 4.2 years, body mass 77.9 ± 12.9 kg, height 173.9 ± 5.4 cm (mean ± SD)] were randomly assigned to a DCER training group, ISOK training group, or control (CONT) group. No significant changes were found for EMD from pre- to posttraining assessments 1, 2, and 3 [4.5 ± 0.2 ms, 4.7 ± 0.2 ms, 4.5 ± 0.1 ms, 4.5 ± 0.2 ms, respectively (mean ± SE)] (P > 0.05). It can be hypothesized that increases in strength observed after a short-term resistance training program may not be attributed to stiffness changes in the series-elastic component.

하지 중심의 플라이오메트릭 훈련과 등속성 훈련이 등속성 근력 및 점프수행능력에 미치는 영향

The purpose of this study was to examine the effects of plyometric and Isokinetic training on muscle strength and jump performance. The subjects consisted of 15 adult males who are majoring Physical Education at the University. These were divided into three groups; plyometric tr aining group, isokinetic training group, control group. The training group performed several movements based on each training method during 6 weeks. The isokinetic muscle strength was measured by Cybex 6000. Jump per formance was measured by SJ height, CMJ height, and RJindex. Two way repeated ANOVA was used to analyze the interaction effect of group and time. Isokinetic training group showed strength elevation from more joint than that of plyometric training group. Plyometric training group and isokinetic training group showed similar improvement in SJ height, CMJ height, and RJindex statistically. In conclusion, the results of this study suggested that isokinetic training has an effect on the isokinetic muscle strength, and the jump performance ability Improvement of physical strength and functionality can be expected in accordance of the stability which is the a significant aspect of isokinetic training.

Effect of isokinetic cycling versus weight training on maximal power output and endurance performance in cycling

The aim of this study was to compare the effects of a weight training program for the leg extensors with isokinetic cycling training (80 rpm) on maximal power output and endurance performance. Both strength training interventions were incorporated twice a week in a similar endurance training program of 12 weeks. Eighteen trained male cyclists (VO(2peak) 60 +/- 1 ml kg(-1) min(-1)) were grouped into the weight training (WT n = 9) or the isokinetic training group (IT n = 9) matched for training background and sprint power (P (max)), assessed from five maximal sprints (5 s) on an isokinetic bicycle ergometer at cadences between 40 and 120 rpm. Crank torque was measured (1 kHz) to determine the torque distribution during pedaling. Endurance performance was evaluated by measuring power, heart rate and lactate during a graded exercise test to exhaustion and a 30-min performance test. All tests were performed on subjects' individual race bicycle. Knee extension torque was evaluated isometrically at 115 degrees knee angle and dynamically at 200 degrees s(-1) using an isokinetic dynamometer. P (max) at 40 rpm increased in both the groups (~15%; P < 0.05). At 120 rpm, no improvement of P (max) was found in the IT training group, which was possibly related to an observed change in crank torque at high cadences (P < 0.05). Both groups improved their power output in the 30-min performance test (P < 0.05). Isometric knee extension torque increased only in WT (P < 0.05). In conclusion, at low cadences, P (max) improved in both training groups. However, in the IT training group, a disturbed pedaling technique compromises an improvement of P (max) at high cadences.

Effects of Preloaded Isokinetic versus Pure Isokinetic Training on Dynamic and Static Lumbar Muscle Strength and Endurance

A training study was conducted to investigate effects of two modes of exercise on the strength and endurance characteristics of the lumbar musculature. Twenty symptom free male subjects were divided into either a preloaded isokinetic (49 Nm preload) or a pure isokinetic training group. Both groups trained for five sets of 10 repetitions at 30°/s for 3 sessions per week for 1 month. Maximum preloaded isokinetic endurance and strength increased 26% (P < .001) and 20% (P = .001) for the preloaded isokinetic group and −1% (NS) and 3% (NS) for the pure isokinetic group. Maximum isometric strength and isometric endurance increased 11% (P < .001) and 3% (NS) for the preloaded isokinetic group and 9% (NS) and 18% (P = .024) for the pure isokinetic group. Both training regimes did not significantly change EMG spectral parameters. The preloaded isokinetic group exhibited retention of strength and endurance gains for as long as a year. The results indicated that the preloaded isokinetic group yielded superior gains in strength and endurance as compared with the pure isokinetic group except for isometric endurance. The observed retention of gains in the preloaded group during follow-ups may help direct rehabilitation to include eccentrics with isokinetic training.

Strength training effects on rearfoot motion in running

The investigation examined isokinetic (IK) and nonisokinetic (NIK) strength training programs for the inversion (INV) and eversion (EV) muscles on pronation during running. Seventy-seven volunteers were videotaped running on a treadmill at 3.8 m.s-1 and total pronation (delta beta PRO) was computed. Eighteen heel-strike runners with the largest values of delta beta PRO (X = 16.7 degrees) were selected as subjects. During the pre- and posttests, isokinetic muscle strength at 20 and 180 degrees.s-1 was determined for the concentric (CON) and eccentric (ECC) actions of the INV and EV muscle groups. The subjects also were videotaped running on a treadmill (3.8 m.s-1). The IK training group performed three sets of eight CON and ECC repetitions at 20, 90, and 180 degrees.s-1 for both muscle groups; and the NIK subjects did exercises commonly used in ankle rehabilitation. Each group trained three times weekly for 8 wk. The IK group showed significantly (P < or = 0.05) CON and ECC strength increases for all INV test conditions and three of the four EV conditions (20 degrees.s-1 CON and ECC, and 180 degrees.s-1 CON). They also demonstrated significant decreases in the rearfoot (2.2 degrees) and pronation/supination (2.9 degrees) angles at heel strike and in delta beta PRO (-2.2 degrees).l The NIK group exhibited no change in rearfoot motion and only increased INV strength at the 180 degrees.s-1 ECC test condition. The findings suggest that pronation can be decreased by an isokinetic strength training program for the INV and EV muscles.

Two Speeds of Isokinetic Exercise as Related to the Vertical Jump Performance of Women

Abstract In order to ascertain the effect of 2 contrasting speeds of isokinetic training programs upon performance of women in the vertical jump, 48 varsity and second team intercollegiate volleyball players from 4 universities were randomly assigned to either a control or isokinetic training group. After performing 3 sets of 10 leg press repetitions maximum, 3 days/wk for 8 wks, on isokinetic speed controlled machines, the groups were compared on a strength measure and on vertical jump performance. According to the group to which they were assigned (control, fast speed, or slow speed) subjects from all schools were combined according to treatment effect for comparison purposes on the vertical jump. For the strength measure, the combined slow or fast speed subject groupings formed an experimental treatment group which was compared to a combined control group. A 2-way ANOVA with repeated measures on 1 factor was applied to data obtained on the jump and on each of the strength measures. Results indicated th...