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The physiological responses to walking uphill under hot environment.

M Ishida

    The Bulletin of Tokyo Medical and Dental University
    |June 1, 1975
    PubMed
    Summary
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    To ensure safety during uphill walking in hot environments, maintain relative metabolic rate (RMR) below 6. Physiological responses indicate that keeping heart rate under 130 beats/min is crucial for safe exercise intensity.

    Area of Science:

    • Environmental Physiology
    • Human Exercise Physiology
    • Occupational Health

    Background:

    • Assessing physiological responses to exercise in hot environments is critical for safety.
    • Uphill walking in radiant heat presents unique physiological challenges.
    • Understanding safe exercise parameters is vital for preventing heat-related illnesses.

    Purpose of the Study:

    • To determine safety conditions for uphill walking in hot environments with radiant heat.
    • To evaluate physiological responses to varying speeds, gradients, and loads.
    • To establish safe exercise intensity limits based on physiological indicators.

    Main Methods:

    • Human experiments involving three healthy adult males.
    • Uphill treadmill walking at varied speeds (45-65 m/min) and gradients (0-10 degrees).

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  • Exposure to radiant heat (1.3 cal/cm2.min) in a controlled hot environment (33°C, 60% RH, 0.7 m/sec airflow).
  • Measurement of physiological responses including heart rate, respiration rate, rectal temperature, and relative metabolic rate (RMR).

    • Main Results:

    • Work intensity (RMR) of uphill walking is modifiable by speed and load, influenced by slope.
    • Physiological responses show a distinct change between RMR 5 and 6.
    • Maintaining RMR below 6 is recommended based on observed physiological shifts.

    Conclusions:

    • Uphill walking in hot, radiant conditions requires careful management of exercise intensity.
    • Relative metabolic rate (RMR) below 6 is suggested for safer exercise.
    • Heart rate below 130 beats/min is a key indicator for safe uphill walking under RMR 6.