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Mechanical work and efficiency in level walking and running

G A Cavagna, M Kaneko

    The Journal of Physiology
    |June 1, 1977
    PubMed
    Summary
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    Mechanical power for limb movement (W(int)) increases with speed in walking and running. Muscle efficiency is higher in running, suggesting greater reliance on elastic energy storage and recoil.

    Area of Science:

    • Biomechanics
    • Human locomotion
    • Exercise physiology

    Background:

    • Understanding the energetic costs of human movement is crucial for optimizing performance and preventing injury.
    • Previous research has quantified external work (W(ext)) related to body center of mass movement.
    • Internal mechanical work (W(int)) related to limb acceleration is a significant, yet less understood, component of locomotion energetics.

    Purpose of the Study:

    • To measure the internal mechanical power (W(int)) during level walking and running across a range of speeds (3-33 km/hr).
    • To compare W(int) with external mechanical power (W(ext)) and total mechanical work (W(tot)) in both gaits.
    • To determine the efficiency of positive work and investigate the underlying mechanisms in walking and running.

    Main Methods:

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    • Utilized a cinematographic procedure to measure W(int) at constant speeds.
    • Calculated total work (W(tot)) as the sum of internal (W(int)) and external (W(ext)) work.
    • Assessed efficiency by comparing W(tot) to net energy expenditure.

    Main Results:

    • W(int) increases quadratically with speed for both walking and running, and is higher in walking than running at any given speed.
    • In walking (>3 km/hr), W(int) exceeds W(ext); in running, W(int) < W(ext) up to ~20 km/hr, after which W(int) > W(ext).
    • Muscle efficiency exceeds 0.25, indicating utilization of stored elastic energy. Walking efficiency peaks at intermediate speeds, while running efficiency increases with speed.

    Conclusions:

    • The mechanical power demands of locomotion are speed-dependent and differ significantly between walking and running.
    • Running appears more efficient due to greater utilization of elastic energy recoil from muscle and tendon.
    • These findings highlight distinct mechanical strategies employed by the human body during walking versus running.