What question did this study set out to answer?

To examine changes in force production, stride kinematics, blood lactate concentration, and muscle electrical activation during a 400-m sprint.

June 1, 1992Journal of Sports Sciences

Changes in force production, blood lactate and EMG activity in the 400‐m sprint

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To examine changes in force production, stride kinematics, blood lactate concentration, and muscle electrical activation during a 400-m sprint.
Assessed 6 male sprinters performing 100-, 200-, 300-, and 400-m trials run at individual 400-m race pace.
Measured integrated electromyography (iEMG), stride length, and ground contact time during runs, alongside resting and post-sprint blood lactate and drop-jump performance.
Running velocity (P < 0.001) and stride length (P < 0.05) decreased while contact time increased (P < 0.01) over the course of the 400-m sprint.
Drop-jump height decreased significantly after 300 m (P < 0.05) and 400 m (P < 0.01) compared to rest, correlating inversely with peak blood lactate (r = -0.77, P < 0.001).
Both iEMG and the iEMG-to-velocity ratio increased across sprint distance, indicating preserved or elevated neural drive despite declining muscular force output.

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Implication

Experimental study demonstrates progressive muscle force decline and lactate accumulation in male sprinters, suggesting peripheral rather than central mechanisms drive 400-meter fatigue.

Cite This Study

Nummela et al. (1992) studied this question.

synapsesocial.com/papers/6a70eee478a11c550e0af478 https://doi.org/10.1080/02640419208729920

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Implication

Experimental study demonstrates progressive muscle force decline and lactate accumulation in male sprinters, suggesting peripheral rather than central mechanisms drive 400-meter fatigue.

Changes in force production, blood lactate and EMG activity in the 400‐m sprint

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Discussion

Implication

Cite This Study

Changes in force production, blood lactate and EMG activity in the 400‐m sprint

Key Points

Discussion

Implication

Cite This Study

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