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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).
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Eccentric isokinetic group | Experimental | In this group, eccentric isokinetic training of hamstring muscle was performed. |
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| Concentric isokinetic group | Active Comparator | In this group, concentric isokinetic training of hamstring muscle was performed. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Eccentric isokinetic training | Other | Eccentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device. |
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| 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 |
| 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. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Masood Khan, M.P.Th | King Saud University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| King Saud University | Riyadh | 11433 | Saudi Arabia |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 36196400 | Derived | Sharma KN, Quddus N, Hameed UA, Khan SA, Kumari A, Alghadir AH, Khan M. Mode-specific effects of concentric and eccentric isokinetic training of the hamstring muscle at slow angular velocity on the functional hamstrings-to-quadriceps ratio-a randomized trial. PeerJ. 2022 Sep 29;10:e13842. doi: 10.7717/peerj.13842. eCollection 2022. |
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Participants were randomly divided into two groups.
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| Concentric isokinetic training | Other | Concentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device. |
|
| 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 |