SHOULDERS AND HIPS ROLL TOGETHER IN CRAWL STROKE
Keppenham, B. C., & Yanai, T. (1995). Limb motions and body roll in skilled and unskilled front crawl swimmers. Medicine and Science in Sports and Exercise, 27(5), Supplement abstract 1299.
The coordination of limb movements and body roll in skilled (S) and unskilled swimmers (U) was investigated. Specifically, the timing of the hand entry with respect to body roll, and the timing of the strong beat kick with respect to body roll were analyzed.
Shoulder (S 80 degrees; U 70 degrees) and hip (S 50 degrees; U 40 degrees) rolls were similar for both groups as was the duration of the recovery phase of the stroke. The coordination of the strong beat kick with body roll was also similar between the groups.
The coordinations of the initial arm movement, body roll, and strong beat kick were different between the groups.
It was concluded that the strong beat kick was highly associated with body and hip roll and that unskilled swimmers delay the timing of arm movements with respect to shoulder and hip roll.
Implications. The following are suggested as teaching ingredients for crawl stroke timing.
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