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Related Experiment Videos

Resistance training increases lower body negative pressure tolerance

J T Lightfoot1, D J Torok, T W Journell

  • 1Human Performance Laboratory, Florida Atlantic University, Boca Raton 33431.

Medicine and Science in Sports and Exercise
|August 1, 1994
PubMed
Summary

Whole body resistance training enhances tolerance to lower body negative pressure (LBNP) by reducing fluid pooling. Chronically trained individuals show even greater LBNP tolerance, suggesting potential benefits for cardiovascular regulation.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Physiology
  • Human Adaptation

Background:

  • Lower body negative pressure (LBNP) is used to simulate hypovolemic conditions.
  • Understanding physiological adaptations to resistance training is crucial for optimizing human performance and health.
  • Previous research has not fully elucidated the effects of whole-body resistance training on LBNP tolerance.

Purpose of the Study:

  • To investigate the impact of a 12-week whole-body resistance training program on LBNP tolerance.
  • To compare LBNP tolerance between an acute resistance training group, a control group, and a chronically resistance-trained group.
  • To explore potential physiological mechanisms, such as fluid pooling and baroreflex function, underlying changes in LBNP tolerance.

Main Methods:

Related Experiment Videos

  • Twelve healthy males completed a 12-week acute resistance training (ART) program.
  • Both ART and control groups underwent pre- and post-training LBNP tolerance tests.
  • Neck pressure-suction testing and measurements of leg circumference changes were performed to assess fluid pooling and baroreflex sensitivity.

    • Main Results:

    • The ART group demonstrated significantly increased LBNP tolerance post-training.
    • A decrease in leg circumference change indicated reduced fluid pooling in the ART group.
    • The chronically resistance-trained (CRT) group exhibited superior LBNP tolerance compared to both ART and control groups.
    • The CRT group showed a blunted baroreflex response, potentially attributed to increased neck muscle mass.

    Conclusions:

    • Whole-body resistance training improves LBNP tolerance, likely through enhanced vascular compliance and reduced fluid accumulation.
    • Chronically resistance-trained individuals possess markedly higher LBNP tolerance, though the underlying mechanisms require further investigation.
    • Resistance training may offer protective cardiovascular benefits in environments simulating reduced central blood volume.