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Related Experiment Videos

Aerobic performance capacity in paraplegic subjects.

R Flandrois, M Grandmontagne, H Gerin

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1986
    PubMed
    Summary

    Paraplegics show higher lactate thresholds (LT) during arm exercise, indicating enhanced intracellular adaptations despite lower maximal oxygen uptake (VO2max). This suggests training benefits in paraplegics may stem from improved cellular metabolism rather than circulatory changes.

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    Area of Science:

    • Exercise Physiology
    • Sports Medicine
    • Rehabilitation Science

    Background:

    • Understanding exercise adaptation in individuals with spinal cord injuries is crucial for optimizing training and rehabilitation.
    • Paraplegia significantly impacts physiological responses to exercise, particularly cardiovascular and metabolic functions.

    Purpose of the Study:

    • To investigate the physiological adaptations to prolonged exercise in individuals with paraplegia compared to able-bodied individuals.
    • To determine if exercise training in paraplegics elicits adaptations at the maximal oxygen uptake (VO2max) or lactate threshold (LT) levels.

    Main Methods:

    • Maximal oxygen uptake (VO2max) and lactate threshold (LT) were assessed in nine paraplegic patients and nine able-bodied subjects using arm cranking exercise.
    • VO2max and LT were analyzed in relation to the level of spinal cord injury in the paraplegic group.

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    Main Results:

    • Paraplegic subjects exhibited lower mean VO2max compared to able-bodied subjects, with VO2max inversely related to the level of spinal injury.
    • Lactate threshold (LT), expressed as a percentage of VO2max, was significantly higher in paraplegics (59%) than in able-bodied subjects (43%).

    Conclusions:

    • Paraplegics demonstrate altered exercise adaptation, characterized by a higher LT, suggesting enhanced intracellular metabolic efficiency.
    • The findings indicate that exercise training in paraplegics may primarily improve intracellular chemistry, including reduced glycogenolysis and increased lipid utilization, rather than circulatory adaptations.