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Self-pacing during sustained, repetitive exercise.

W S Myles, J P Eclache, J Beaury

    Aviation, Space, and Environmental Medicine
    |September 1, 1979
    PubMed
    Summary
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    Young soldiers maintained a consistent relative workload during a 6-day march by adjusting load weight, self-pacing at 30-40% of aerobic power (Vo2max). Foot condition was the primary performance limiter.

    Area of Science:

    • Exercise physiology
    • Military science
    • Biomechanics

    Background:

    • Military training often involves prolonged marches.
    • Individual aerobic capacity (Vo2max) varies significantly among soldiers.
    • Maintaining a consistent relative workload is crucial for effective training and performance.

    Purpose of the Study:

    • To determine if adjusting load weight can equalize relative exercise intensity (percentage of Vo2max) among soldiers with differing aerobic capacities.
    • To assess the self-pacing capabilities of fit soldiers during extended marches.
    • To identify factors limiting performance during such marches.

    Main Methods:

    • 25 young French infantry soldiers marched 204 km over 6 days.
    • Load weights were individually adjusted to maintain a consistent percentage of each soldier's maximal oxygen uptake (Vo2max).

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  • Energy expenditure was monitored using electrocardiogram (ECG) telemetry to record heart rates.

    • Main Results:

    • Adjusting load weight effectively equalized the relative workload across soldiers with diverse Vo2max levels.
    • Soldiers consistently self-paced at 30-40% of their Vo2max throughout the 6-day march.
    • Foot condition, due to the hard road surface, emerged as the main performance-limiting factor for many participants.

    Conclusions:

    • Load weight adjustment is a practical method for standardizing relative exercise intensity in military marches.
    • Fit soldiers can sustain a moderate relative workload (30-40% Vo2max) for extended periods (at least 6 days).
    • Foot care and appropriate footwear are critical for optimizing performance and preventing injury during prolonged road marches.