Joint Torque and Mechanical Power of Lower Extremity and Its Relevance to Hamstring Strain during Sprint Running

Table 2

Comparison of peak muscle power in the lower extremity muscle groups during a gait circle.

	Hip joint muscle		Knee joint muscle		Ankle joint muscle
	Extensors	Flexors	Extensors	Flexors	Plantarflexors	Dorsiflexors
Peak positive power (W)	3996 ± 1120^†	1735 ± 339	627 ± 113	1010 ± 208^†	3954 ± 673^†	135 ± 49
Peak negative power (W)	−1606 ± 781	−630 ± 108	−655 ± 126	−1402 ± 372	−4930 ± 933	−96 ± 25

Significantly different from the flexors of identical joint; ^†significantly different from the peak negative power of identical joint muscle (the absolute value).