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Dissociated time course recovery between rate of force development and peak torque after eccentric exercise
Renato Molina1, Benedito S Denadai
1Human Performance Laboratory, São Paulo State University, UNESP, Rio Claro, SP, Brazil.
Clinical Physiology and Functional Imaging
|April 11, 2012
Summary
Eccentric exercise impairs quadriceps peak torque and peak rate of force development. While both measures recover, their recovery timelines differ, suggesting distinct physiological mechanisms influence their return to baseline following muscle damage.
Area of Science:
- Exercise Physiology
- Muscle Physiology
- Sports Science
Background:
- Eccentric exercise is known to induce muscle damage, leading to impaired muscle function.
- Understanding the recovery patterns of key strength and power metrics is crucial for training and rehabilitation.
- Isokinetic peak torque (PT) and peak rate of force development (peak RFD) are important indicators of muscle function.
Purpose of the Study:
- To investigate the association between isokinetic peak torque (PT) and peak rate of force development (peak RFD) during recovery from eccentric exercise.
- To examine the time course of recovery for PT and peak RFD following a bout of maximal eccentric contractions.
- To correlate changes in PT and peak RFD during the recovery period.
Main Methods:
- Twelve untrained men performed 100 maximal eccentric knee extensor contractions.
- Isokinetic concentric peak torque (PT) and peak rate of force development (peak RFD) were measured at 60°/s before, and 24 and 48 hours after exercise.
- Indirect markers of muscle damage, including delayed onset of muscle soreness (DOMS) and plasma creatine kinase (CK) activity, were assessed.
Main Results:
- Eccentric exercise significantly increased DOMS and CK levels.
- At 24 hours post-exercise, both PT (-15.3%) and peak RFD (-13.1%) were significantly reduced.
- At 48 hours, PT remained significantly decreased (-7.9%), while peak RFD had returned to baseline values. Strong correlations were observed between PT and peak RFD throughout recovery.
Conclusions:
- Muscle damage induced by eccentric exercise differentially affects the recovery time course of isokinetic peak torque and peak rate of force development.
- Peak torque and peak rate of force development recovery are related but not entirely dictated by the same physiological mechanisms post-exercise.
- These findings highlight distinct recovery trajectories for strength and power after eccentric muscle damage.
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