Related Experiment Video
Updated: Jun 25, 2025
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Measurement of Maximum Isometric Force Generated by Permeabilized Skeletal Muscle Fibers
Published on: June 16, 2015
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Large inter-individual variability in force-velocity profile changes in response to acute high-load resistance
Gergely Pálinkás1, Bettina Béres1, Katinka Utczás1
1Research Center for Sport Physiology, Hungarian University of Sports Science, Budapest, Hungary.
Physiology International
|May 28, 2024
Summary
High-load resistance training acutely reduced jump performance and power but did not alter the force-velocity (FV) profile. Individual responses to training load show high variability, indicating the FV profile
Area of Science:
- Sports Science
- Exercise Physiology
- Biomechanics
Background:
- While acute effects of high-load resistance training on muscle force capacity are known, its impact on the force-velocity (FV) profile is less understood.
- The vertical FV profile is sensitive to exercise-induced changes in muscle mechanical properties, but interpretations vary.
- Limited data exist on how high-load resistance training specifically affects the FV profile in relation to maximal strength.
Purpose of the Study:
- To investigate the acute effects of a high-load resistance training protocol on muscle mechanical properties during loaded jumps.
- To examine changes in the vertical force-velocity (FV) profile following high-load resistance training.
- To assess the relationship between maximal strength and alterations in the FV profile post-exercise.
Main Methods:
- Twenty-nine resistance-trained males and 29 females participated.
- Measurements included five-repetition maximum (5RM) back squat, unloaded countermovement jump (CMJ), and FV profile.
- Participants completed exercise protocols at 5RM, followed by immediate re-assessment of CMJ and FV profile.
Main Results:
- A significant decrease in CMJ height (5-6%) and average power (4%) was observed in both sexes.
- The FV profile remained unchanged, but theoretical maximal power decreased by 4-5% and theoretical maximal velocity by ~3%.
- Maximal strength was not significantly associated with changes in the FV profile.
Conclusions:
- Acute high-load exercise reduced vertical jump performance and maximal power output without altering the FV profile.
- High interindividual variability in FV measures suggests a complex and not always straightforward response to acute training loads.
- The FV profile's utility in monitoring acute training load responses requires further investigation due to observed variability.
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