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Neuromuscular differences between endurance-trained, power-trained, and sedentary subjects
Gregory Lattier1, Guillaume Y Millet, Nicola A Maffiuletti
1INSERM/ERIT-M 0207 Motricité-Plasticité, Université de Bourgogne, Unité de Formation et de Recherche Sciences Techniques des Activité Physiques et Sportives, Dijon, France. Gregory.Lattier@u-bourgogne.fr
Journal of Strength and Conditioning Research
|August 22, 2003
Summary
Power-trained athletes exhibit superior muscle force development, enhancing vertical jump performance. Intrinsic muscle qualities, not just activation, directly influence explosive movements like the vertical jump.
Area of Science:
- Neuromuscular physiology
- Exercise science
- Sports biomechanics
Background:
- Understanding neuromuscular adaptations to different training types is crucial for optimizing athletic performance.
- Differences in muscle characteristics may explain performance variations in explosive movements.
- Previous research often focuses on maximal strength rather than dynamic performance factors.
Purpose of the Study:
- To investigate if neuromuscular characteristics differentiate performance in vertical jump and maximal voluntary isometric contraction (MVC) among endurance-trained (END), power-trained (POW), and sedentary (SED) individuals.
- To determine the relationship between muscle contractile properties and explosive performance.
- To elucidate the role of intrinsic muscle qualities versus voluntary activation in performance.
Main Methods:
- Comparison of neuromuscular characteristics (evoked twitch, maximal rate of force development - MRFD) in plantar flexor (PF) and knee extensor (KE) muscles.
- Measurement of maximal voluntary isometric contraction (MVC) and maximal voluntary activation (%VA) of KE.
- Assessment of vertical jump performance (squat jump).
- Inclusion of three groups: END (n=9), POW (n=8), and SED (n=8).
Main Results:
- POW individuals demonstrated significantly higher MRFD in both PF and KE compared to SED and END groups.
- Both POW and END groups showed higher %VA and MVC than the SED group.
- POW individuals achieved significantly higher vertical jump performances than both END and SED groups.
- Significant positive correlations were found between squat jump performance and MRFD of both KE and PF.
Conclusions:
- Maximal rate of force development (MRFD) is a key differentiator in explosive performance, particularly the vertical jump.
- Low MRFD does not impede MVC expression in individuals with high voluntary activation.
- Intrinsic muscle properties, specifically rapid force generation, play a direct and significant role in vertical jump performance, independent of maximal voluntary activation.