No Correlation Between Plantar Flexor Muscle Volume and Sprint Performance in Sprinters

Area of Science:

• Biomechanics and Exercise Physiology
• Sports Science and Performance Analysis

Background:

• Plantar flexor torque is crucial for sprint performance.
• Muscle size, specifically plantar flexor muscle volume (MV), is often assumed to correlate with torque and sprint ability.
• Previous research shows inconsistent relationships between plantar flexor size and sprint performance, with limited studies measuring MV.

Purpose of the Study:

• To investigate the relationship between plantar flexor muscle volume (MV) and sprint performance in sprinters.
• To test the hypothesis that plantar flexor MVs are not critical morphological factors for sprint performance.

Main Methods:

• Fifty-two male sprinters and 26 non-sprinters participated.
• Sprinters were categorized into four performance groups using K-means cluster analysis based on their 100m sprint times.
• Magnetic resonance imaging (MRI) was used to measure the muscle volume (MV) of the gastrocnemius lateralis, gastrocnemius medialis, and soleus, both absolutely and relative to body mass.

Main Results:

• Sprinters exhibited significantly greater absolute and relative plantar flexor MVs compared to non-sprinters (p < 0.01).
• No significant differences in any plantar flexor MV variables were found among the four sprinter performance groups (p > 0.05).
• Plantar flexor MV variables showed no significant correlation with 100m sprint times in sprinters (p > 0.05).

Conclusions:

• While sprinters possess larger plantar flexor muscles than non-sprinters, this increased muscle volume is not a determining factor for their sprint performance.
• Morphological factors beyond plantar flexor muscle size appear more critical for achieving superior sprint capabilities.