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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
30
Eccentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device.
Concentric exercises of the hamstring muscles were performed with the use of an isokinetic dynamometer device.
King Saud University
Riyadh, Saudi Arabia
Functional Hamstring-to-quadriceps ratio (PTecc:PTcon)
This ratio was calculated using eccentric peak of hamstring and concentric peak torque of quadriceps muscle
Time frame: 6 weeks
Acceleration time of hamstring (AThams)
Time required by hamstring muscle to reach desired velocity was noted.
Time frame: 6 weeks
Acceleration time of quadriceps
Time required by quadriceps muscle to reach desired velocity was noted.
Time frame: 6 weeks
Deceleration time of hamstring (DThams)
Time required by hamstring muscle to reach zero velocity from target velocity, was noted.
Time frame: 6 weeks
Deceleration time of quadriceps
Time required by quadriceps muscle to reach zero velocity from target velocity to, was noted.
Time frame: 6 weeks
Time to peak torque of hamstring
Time required by hamstring muscle to reach peak torque was noted.
Time frame: 6 weeks
Time to peak torque of quadriceps
Time required by quadriceps muscle to reach peak torque was noted.
Time frame: 6 weeks
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