What question did this study set out to answer?

To examine alterations in lower-extremity joint work and power during the swing phase throughout maximal sprint acceleration.

January 1, 2017Biology OpenOpen Access

Alteration of swing leg work and power during human accelerated sprinting

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Biomechanical study demonstrates shifting lower-limb swing work and power in male sprinters, indicating energy absorption drives late acceleration.

To examine alterations in lower-extremity joint work and power during the swing phase throughout maximal sprint acceleration.
Twelve male sprinters completed 60-m maximal sprints while motion data were captured across each stride.
Lower-extremity joint work and power were calculated during the swing phase of each stride for both legs across the acceleration phase.
Positive hip work (≈4.3 J·kg−1) and negative knee work (≈−2.9 J·kg−1), along with mean powers, stabilized or decreased after the 26.2±1.1 m (9.69±0.25 m·s−1) or 34.3±1.5 m mark (9.97±0.26 m·s−1).
Hip negative work and mean power during early swing increased ≈7-fold and ≈3.7-fold, while terminal swing knee negative work and power increased ≈1.85-fold and ≈2-fold approaching maximal speed.
Only the increases in negative work and mean power at the hip and knee joints during swing were positively associated with speed gains from the middle of acceleration onward.

Nagahara et al. (2017) studied this question.

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Biomechanical study demonstrates shifting lower-limb swing work and power in male sprinters, indicating energy absorption drives late acceleration.