Correlation between running asymmetry, mechanical efficiency, and performance during a 10 km run.

Area of Science:

• Biomechanics
• Exercise Physiology
• Sports Science

Background:

• Running asymmetry is a recognized concern for athletic performance and injury risk.
• The precise relationship between running asymmetry and performance outcomes remains incompletely understood.
• Various strategies exist to address asymmetries and their impact on running performance.

Purpose of the Study:

• To investigate the correlation between the global symmetry index and mechanical efficiency during a 10km running race.
• To quantify the relationship between symmetry and energy expenditure in trained amateur runners.

Main Methods:

• Thirteen amateur runners (8 male, 5 female) completed a 10km run at a fixed pace.
• A 3D accelerometer on the pelvic region recorded motion data, and gas exchange was monitored breath-by-breath.
• Global symmetry index was calculated across three directions, and mechanical efficiency was determined from external work and energy expenditure.

Main Results:

• Both global symmetry index and mechanical efficiency significantly decreased during the 10km run (p < 0.01).
• A positive correlation (r=0.66, p=0.01) was found between global symmetry index and mechanical efficiency.
• Vertical asymmetry had a notable impact on the global symmetry index, which explained 43.1% of the variance in mechanical efficiency (p=0.015).

Conclusions:

• Symmetry, as measured by the global symmetry index, is directly correlated with mechanical efficiency in runners.
• Maintaining symmetry during endurance running may be vital for optimizing energy expenditure and performance.
• Vertical asymmetry appears to be a significant factor influencing overall running symmetry and efficiency.