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Related Experiment Videos

Effect of exercise on plasma renin substrate.

K Metsärinne1

  • 1Unit of Clinical Physiology, Minerva Foundation Institute for Medical Research, Helsinki, Finland.

International Journal of Sports Medicine
|August 1, 1988
PubMed
Summary

Physical exercise significantly increases plasma renin activity (PRA) and affects plasma renin substrate (RS) levels. During prolonged exercise, RS levels are maintained by increased synthesis, suggesting a regulatory mechanism during sustained physical exertion.

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Area of Science:

  • Physiology
  • Endocrinology
  • Exercise Science

Background:

  • The renin-angiotensin system (RAS) plays a crucial role in regulating blood pressure and fluid balance.
  • Physical exercise is known to influence the RAS, but the specific effects on plasma renin substrate (RS) and plasma renin activity (PRA) require further elucidation.

Purpose of the Study:

  • To investigate the impact of short-term and prolonged physical exercise on plasma renin substrate (RS) and plasma renin activity (PRA) levels in healthy males.
  • To differentiate the measurement of intact RS from total RS (intact RS and des-angiotensin I-RS) during exercise.

Main Methods:

  • Dynamic exercise tests at varying workloads (50-200 W) for short-term assessment.
  • A 75-km cross-country ski race for prolonged exercise assessment.

Related Experiment Videos

  • Measurement of plasma renin substrate (RS) using direct radioimmunoassay (RIA) and indirect enzymatic assay, and plasma renin activity (PRA).

    • Main Results:

    • Short-term exercise showed a significant increase in total RS (measured by direct RIA) and PRA, while intact RS (measured by enzymatic assay) did not change.
    • Prolonged exercise resulted in a >2-fold increase in PRA.
    • RS levels showed non-significant increases during prolonged exercise (22% by direct RIA, 10% by enzymatic assay).

    Conclusions:

    • Increased PRA during exercise leads to enhanced RS consumption, which is counterbalanced by increased RS synthesis or release.
    • Liver production of RS appears to plateau during prolonged exercise, maintaining levels for extended durations (7-8 hours).
    • These findings highlight the dynamic regulation of the renin-angiotensin system in response to physical stress.