Mode Specific Effects of Isokinetic Training of Hamstring on Hamstring to Quadriceps Ratio

Study Overview
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Brief Summary
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Mode specificity of eccentric and concentric isokinetic training have been examined in previous studies but with conflicting results. The present study aimed to examine the mode-specific effects of eccentric and concentric isokinetic training of hamstring muscle at slow angular velocity on eccentric peak torque of hamstring (PTecc), concentric peak torque of quadriceps (PTcon), acceleration time of hamstring (AThams) and quadriceps (ATquad), deceleration time of hamstring (DThams) and quadriceps (DTquad), time to peak torque of hamstring (TPThams) and quadriceps (TPTquad), and functional Hamstring-to-Quadriceps ratio (PTecc/PTcon).

Detailed Description
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Several studies in past have tried to examine the mode specificity of concentric and eccentric training of different muscles and at different angular velocities i.e. whether concentric training will increase the concentric strength only or both concentric and eccentric strength and whether eccentric training will increase eccentric strength only or both eccentric and concentric strength. Since conflicting reports are available regarding mode specificity of eccentric and concentric isokinetic training therefore one study was needed that can examine the mode specificity of these training in hamstring muscles at slow angular velocity. The present study aimed to examine the mode-specific effects of six weeks of isokinetic concentric and eccentric training of the hamstring muscle at slow angular velocity on the PTecc/PTcon, AT, DT, and TPT.

Official Title
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Mode-specific Effects of Concentric and Eccentric Isokinetic Training of Hamstring Muscle at Slow Angular Velocity on Functional Hamstrings-to-quadriceps Ratio

Conditions
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Muscle Strength

Intervention / Treatment
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* Other: Eccentric isokinetic training
* Other: Concentric isokinetic training


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy young males Age between 18 to 27 Recreationally active who used to engage regularly in 1-5 hours of physical activity per week Exclusion Criteria: Individual presently indulged in strength training of knee. Individuals with any kind of injury around the knee, hip, ankle, foot Unconsolidated fractures around the knee. • Stress fractures Subjects with the acute phase of trauma, which may interfere with the exercise regime Subjects with cardio-respiratory problems and other medical problems like diabetes, asthma, etc. Subjects with tendinitis and other inflammatory conditions.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 28 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Participants were randomly divided into two groups.
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Eccentric isokinetic group<br>In this group, eccentric isokinetic training of hamstring muscle was performed. | Other: Eccentric isokinetic training<br>* Eccentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device.<br>|
| Active Comparator: Concentric isokinetic group<br>In this group, concentric isokinetic training of hamstring muscle was performed. | Other: Concentric isokinetic training<br>* Concentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Functional Hamstring-to-quadriceps ratio (PTecc:PTcon) | This ratio was calculated using eccentric peak of hamstring and concentric peak torque of quadriceps muscle | 6 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acceleration time of hamstring (AThams) | Time required by hamstring muscle to reach desired velocity was noted. | 6 weeks | 
| Acceleration time of quadriceps | Time required by quadriceps muscle to reach desired velocity was noted. | 6 weeks | 
| Deceleration time of hamstring (DThams) | Time required by hamstring muscle to reach zero velocity from target velocity, was noted. | 6 weeks | 
| Deceleration time of quadriceps | Time required by quadriceps muscle to reach zero velocity from target velocity to, was noted. | 6 weeks | 
| Time to peak torque of hamstring | Time required by hamstring muscle to reach peak torque was noted. | 6 weeks | 
| Time to peak torque of quadriceps | Time required by quadriceps muscle to reach peak torque was noted. | 6 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Isokinetic training, peak torque, acceleration time, deceleration time, time to peak torque, Hamstring-to-Quadriceps ratio