Lower extremity muscular flexibility in long distance runners

Area of Science:

• Sports Medicine
• Biomechanics
• Exercise Physiology

Background:

• Muscle tightness is a recognized risk factor for muscle injuries.
• Understanding muscle flexibility in athletes is crucial for injury prevention and performance optimization.

Purpose of the Study:

• To evaluate and compare muscle flexibility, specifically hamstring, rectus femoris, iliopsoas, gastrocnemius, and soleus muscles, between long-distance runners and non-runners.
• To identify potential differences in muscle tightness based on running status, sex, and limb dominance.

Main Methods:

• Range of motion measurements were taken for five key movements to assess muscle tightness.
• Participants included 20 long-distance runners and 20 non-runners (10 males and 10 females each).
• A three-way analysis of variance was used to compare muscle tightness across groups (runners vs. non-runners, males vs. females, dominant vs. nondominant leg).

Main Results:

• Long-distance runners demonstrated significantly greater hamstring and soleus muscle tightness compared to non-runners (p < .05).
• No significant differences in rectus femoris or iliopsoas muscle tightness were found between runners and non-runners.
• Males exhibited tighter hamstring muscles than females (p < .05), and the dominant leg's hamstrings were tighter than the nondominant leg's in all subjects (p < .05).

Conclusions:

• Long-distance runners present with increased posterior lower extremity muscle tightness.
• This finding suggests a potential link between running and specific patterns of muscle tightness, particularly in the hamstrings and soleus.
• Sex and limb dominance also influence hamstring muscle tightness.