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Effects of limping on normal exercise response

R L Hughes, D Frownfelter, M Piergies

    Journal of Applied Physiology
    |July 1, 1976
    PubMed
    Summary
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    Limping during exercise significantly increases respiratory rate and ventilation, even when accounting for higher oxygen consumption. These changes suggest limping alters the body's regulation of breathing during physical activity.

    Area of Science:

    • Exercise Physiology
    • Biomechanics
    • Respiratory Regulation

    Background:

    • Exercise testing is crucial for assessing physiological responses.
    • Understanding how altered gait mechanics affect cardiorespiratory function is important.

    Purpose of the Study:

    • To investigate the cardiorespiratory and metabolic effects of induced limping during graded treadmill exercise.
    • To determine if limping alters the regulation of exercise hyperpnea.

    Main Methods:

    • Ten subjects underwent two identical exercise tests on a treadmill, one normal and one with induced limping.
    • Work rate was progressively increased by altering treadmill grade.
    • Physiological variables including oxygen consumption, respiratory rate, ventilation, and tidal volume were measured.

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    Main Results:

    • Limping consistently increased respiratory rate and ventilation at most work rates.
    • Oxygen consumption was higher during limping, but increases in ventilation persisted even after adjustment.
    • Tidal volume decreased during limping, except at the highest work rate where differences diminished.

    Conclusions:

    • Induced limping significantly impacts cardiorespiratory responses during exercise.
    • The observed changes in breathing regulation suggest limping alters exercise hyperpnea beyond metabolic demands.
    • Further research is needed to elucidate the precise mechanisms of altered respiratory control during abnormal gait.