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Measurement of Maximum Isometric Force Generated by Permeabilized Skeletal Muscle Fibers
Published on: June 16, 2015
Intramuscular fiber conduction velocity, isometric force and explosive performance.
Spyridon Methenitis1, Gerasimos Terzis1, Nikolaos Zaras1
1Athletics Laboratory, School of Physical Education & Sports Science, National and Kapodistrian University of Athens, Greece.
Muscle fiber conduction velocity (MFCV) is strongly linked to explosive power and the rate of force development in athletes. This neuromuscular measure is a better predictor of rapid force production than maximum isometric strength.
Area of Science:
- Neuromuscular physiology
- Sports science
- Biomechanics
Background:
- Muscle fiber conduction velocity (MFCV) is crucial for muscle force production.
- The relationship between MFCV and explosive performance remains unclear.
Purpose of the Study:
- To investigate the link between vastus lateralis MFCV and countermovement jumping performance.
- To examine the correlation between MFCV and rate of force development (RFD) and maximum isometric force.
Main Methods:
- Fifteen moderately-trained young females performed countermovement jumps and isometric leg press tests.
- Vastus lateralis MFCV was measured using intramuscular microelectrodes.
- RFD and maximum isometric force were determined from the leg press test.
Main Results:
- Maximum MFCV correlated significantly with maximum isometric force (r = 0.66).
- MFCV showed stronger correlations with RFD at various time points (r = 0.85–0.92).
- Mean MFCV and type II MFCV were better correlated with RFD than maximum isometric force.
Conclusions:
- MFCV is more closely associated with the rate of force development than maximum isometric force.
- Higher conduction velocity in fast-twitch muscle fibers may explain this relationship, contributing to explosive actions.
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