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The mechanical efficiency of front crawl swimming
H M Toussaint1, W Knops, G De Groot
1Department of Exercise Physiology and Health, Faculty of Human Movement Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
Medicine and Science in Sports and Exercise
|June 1, 1990
Summary
Competitive swimmers’ gross efficiency, the ratio of power output to input, ranged from 5 to 9.5%. Male swimmers showed higher efficiency due to greater power output, not sex-based differences at equal power.
Area of Science:
- Sports Science
- Human Physiology
- Biomechanics
Background:
- Gross efficiency is a key metric for evaluating swimming performance.
- Understanding factors influencing gross efficiency is crucial for optimizing training.
Purpose of the Study:
- To determine the gross efficiency of swimming in competitive male and female swimmers.
- To investigate the relationship between swimming velocity, power output, and gross efficiency.
- To compare gross efficiency between male and female swimmers.
Main Methods:
- Measured oxygen uptake to calculate power input (rate of energy expenditure).
- Used a MAD-system with force transducers to measure total power output during front crawl swimming.
- Evaluated the effect of respiratory apparatus on total body drag.
Main Results:
- Gross efficiency ranged from 5% to 9.5% across tested velocities (0.95-1.6 m/s).
- Male swimmers exhibited higher gross efficiency at equal speeds, attributed to higher power output.
- Gross efficiency increased with absolute power output.
- No significant difference in gross efficiency was found between sexes at the same power output.
Conclusions:
- Gross efficiency in competitive swimming is dependent on absolute power output.
- While males showed higher efficiency at equal speeds, this is linked to their higher power demands, not inherent sex-based differences.
- These findings provide insights into the physiological economy of swimming performance.