BIOMECHANICAL NOT PHYSIOLOGICAL FACTORS DISCRIMINATE BETWEEN SWIMMERS OF DIFFERENT PERFORMANCE LEVELS
Chatard, J. C., Collomp, C., Maglischo, E., & Maglischo, C. (1990). Swimming skill and stroking characteristics of front crawl swimmers. International Journal of Sports Medicine, 11, 156-161.
The relationships between swimmers' biomechanical arm pulling pattern and technical ability were assessed in four "skilled" and five "less-skilled" athletes (the grouping being determined by a statistical method using all measures). The freestyle stroke was divided into five phases: entry (plus flight), downsweep, insweep, outsweep, and upsweep (round-out). VO2max, height, arm span, hydrostatic lift (maximum weight to maintain a balanced position under water), speed on a standardized 400-yard swim, and competition 500-yard time were measured. VO2max explained 64% of a 400-yard swim performed at 94% of 500-yard pace. Hydrostatic lift was the next most important structural variable. There was no significant difference between the two performance groups on any anthropometric, performance, or physiological variable.
Biomechanical variables did differentiate the groups although there was great variation between individuals (e.g., as much as four times for entry duration and more than twice the time taken on other stroke sections):
Swimming mechanics were the primary factors differentiating the two groups. Even though the size of the groups was small, these variables were strong enough to overcome that limitation.
Implications. The following implications for coaches are derived from this work.
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