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Related Experiment Videos

Relationships between perceived exertion and physiological variables during swimming

T Ueda1, T Kurokawa

  • 1Faculty of Integrated Human Studies and Social Sciences, Fukuoka Prefectural University, Japan.

International Journal of Sports Medicine
|August 1, 1995
PubMed
Summary

Perceived exertion scales effectively measure exercise intensity in tethered swimming. Ratings of Perceived Exertion (RPE) and Category-Ratio 10 (CR-10) correlate strongly with physiological measures like oxygen uptake and heart rate.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Understanding the relationship between subjective exertion and physiological responses is crucial for effective exercise prescription.
  • Tethered swimming presents unique challenges for measuring exercise intensity due to the absence of forward propulsion.
  • Previous research has explored various methods for quantifying exercise intensity, but direct correlations with perceived exertion in tethered swimming require further investigation.

Purpose of the Study:

  • To investigate the relationships between perceived exertion and key physiological variables (oxygen uptake, heart rate, blood lactate) during tethered swimming.
  • To determine the efficacy of the Category Scale (RPE) and Category-Ratio 10 (CR-10) scales in measuring exercise intensity in this specific aquatic environment.
  • To establish mathematical models describing these relationships and assess their applicability for exercise prescription.

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Main Methods:

  • Seven male and ten female subjects performed tethered swimming at five submaximal intensities.
  • Physiological variables including oxygen uptake (VO2), heart rate (HR), and blood lactate concentration (HLa) were measured.
  • Perceived exertion was assessed using both the Ratings of Perceived Exertion (RPE) scale and the Category-Ratio 10 (CR-10) scale.

Main Results:

  • All measured variables (VO2, HR, HLa, RPE, CR-10) were modeled using the equation R = a+c (S-b)n, with drag as the independent variable.
  • Linear relationships were observed between drag and VO2, HR, and RPE for both sexes (correlation coefficients r = 0.989-0.999).
  • Lactate (HLa) and CR-10 exhibited non-linear relationships with drag, with specific exponents for males and females, indicating strong correlations (r = 0.991-1.000).

Conclusions:

  • Ratings of Perceived Exertion (RPE) are a valid and effective tool for quantifying exercise intensity in tethered swimming.
  • The strong correlations between perceived exertion scales and physiological measures support their use in practical exercise prescription for swimmers.
  • The established mathematical models provide a quantitative basis for tailoring training intensity in aquatic environments.