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Spinal loading during circuit weight-training and running.

P Leatt, T Reilly, J G Troup

    British Journal of Sports Medicine
    |September 1, 1986
    PubMed
    Summary
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    Spinal shrinkage, a measure of spinal loading, was assessed in weight-training and running. Exercise caused height loss, but diurnal variation significantly exceeded exercise-induced shrinkage.

    Area of Science:

    • Biomechanics
    • Exercise Physiology

    Background:

    • Spinal shrinkage is a quantifiable indicator of spinal loading during physical activity.
    • Understanding spinal loading is crucial for preventing injuries and optimizing training protocols.

    Purpose of the Study:

    • To investigate spinal shrinkage as an indicator of spinal loading during circuit weight-training and running.
    • To compare the magnitude of spinal shrinkage across different exercise intensities and durations.
    • To explore the relationship between spinal shrinkage, diurnal variations, and recovery.

    Main Methods:

    • Male subjects (n=26) participated in circuit weight-training (n=10), a 6 km run (novices, n=9), and a 25 km run (trained runners, n=7).
    • Height loss (spinal shrinkage) was measured to assess spinal loading.

    Related Experiment Videos

  • Diurnal height variations and lumbar extension patterns were also monitored.

    • Main Results:

    • Spinal shrinkage was observed in all exercise regimes, with no significant difference between weight-training and a 6 km novice run.
    • Experienced runners exhibited a consistent height loss rate over extended distances.
    • Diurnal height variation (mean 14.4 mm) was substantially greater than exercise-induced shrinkage, with recovery observed after sleep but not short rest periods.

    Conclusions:

    • Circuit weight-training and running induce spinal loading, measurable by spinal shrinkage.
    • Diurnal spinal length variations are a significant factor that can mask or influence exercise-induced changes.
    • These findings have implications for exercise warm-up strategies and the timing of physical activities to mitigate spinal loading.