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Slow volume changes in calf and thigh during cycle ergometer exercise.

C Stick1, W Heinemann, E Witzleb

  • 1Institut für angewandte Physiologie und medizinische Klimatologie, Christian-Albrechts-Universität, Kiel 1, Federal Republic of Germany.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1990
PubMed
Summary

Transcapillary fluid movement in the lower limb differs between resting and exercising states. Calf volume decreases during exercise, while thigh volume may increase, explaining conflicting research findings.

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Area of Science:

  • Physiology
  • Human Physiology
  • Exercise Physiology

Background:

  • Transcapillary fluid dynamics are crucial for understanding limb volume regulation.
  • Previous studies show conflicting results regarding lower limb volume changes during exercise.

Purpose of the Study:

  • To investigate transcapillary fluid shifts in the human lower limb.
  • To analyze volume changes in the thigh and calf during static and dynamic exercise.

Main Methods:

  • Utilized mercury-in-rubber-strain gauge plethysmography to measure slow volume changes.
  • Recorded thigh and calf volumes in 20 healthy volunteers.
  • Included conditions: sitting, standing, and cycle ergometer exercise (50W and 100W).
  • Employed low-pass filtering to eliminate movement artifacts during exercise recordings.

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Main Results:

  • Both thigh and calf volumes increased while sitting and standing due to enhanced transcapillary filtration.
  • Calf volume decreased during 50W and 100W exercise (mean rate: -0.09%/min).
  • Thigh volume showed no significant change at 50W but increased at 100W exercise (+0.6% in the first 10 minutes).
  • Observed opposite volume changes in the thigh and calf simultaneously.

Conclusions:

  • Contradictory findings in the literature may stem from simultaneous, opposing volume changes in different muscle groups.
  • Exercise-induced calf volume reduction is likely due to decreased venous pressure, increased lymph flow, and elevated tissue pressure in contracting muscles.