Comparison of hamstring-to-quadriceps ratio between accelerating and decelerating sections during squat exercise.
Won-Gyu Yoo
PMID 27799671WHAT IT FOUND
Hamstring-to-quadriceps muscle activity ratio was higher during the slowing-down part of a squat than during the speeding-up part (0.79 vs 0.54) in nine healthy men.
Key findings
01The hamstring-to-quadriceps activity ratio was higher in the decelerating section (0.79) than in the accelerating section (0.54; p<0.05) during squat exercise.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only nine asymptomatic males were studied, and they had no lower limb or spine pathologies, so it does not show what happens in patients with ACL weakness or injury. The measured outcome was an EMG-derived muscle activity ratio, not a functional or injury outcome. The ACL-prevention statement appears in the Discussion, while the measured result was the hamstring-to-quadriceps ratio.
The easy way to misread this
Do not read the higher decelerating-section ratio as proof that slowing the squat prevents ACL injury or improves patient outcomes. The participants were asymptomatic males with no lower limb or spine pathologies, and the measured outcome was a muscle activity ratio.