Comparison of muscle synergies before and after 10 minutes of running.

Eight healthy young men is a very small sample, and all were right-foot dominant, so this may not apply to women, older adults, injured runners, or people who are not right-foot dominant. The same eight men were measured before and after running, so time, warm-up, or measurement effects cannot be ruled out. The running intervention was only 600 seconds at 70% of maximal oxygen consumption, which is shorter and less intense than many sports or competition sessions. The outcome was an EMG muscle synergy pattern, not pain, function, injury, or clinical performance. The authors selected four modules to make comparison easier, although previous work reported five modules during running. Higher-intensity preliminary running was not used because sweat made electrodes difficult to maintain, so the measured intensity may not reflect fatigue conditions.

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Do not conclude that 10 minutes of running causes trunk-to-pelvic control failure or injury risk. The study measured EMG muscle synergy patterns in eight healthy men, found module 4 changed while modules 1 to 3 did not, and did not assess patients, injuries, or training outcomes.