Faculty of Kinesiology and Health Studies, University of Regina, Regina, Saskatchewan, Canada.
J Sports Sci. 2011 Mar;29(5):517-26. doi: 10.1080/02640414.2010.543912.
The main aim of this study was to determine the absolute temporal relationship between the power and recovery phases of the stroke cycle in front crawl swimming in response to progressive changes in exercise intensity that occurred before and after critical speed. A second objective was to determine whether intensity-related changes in the power/recovery phase relationship affects the bilateral symmetry of the stroke. Stroke parameters were recorded for each 25-m length during a progressive 200-m interval training set, in which eight (2 males, 6 females) national-level swimmers swam at intensities below, above, and at critical speed. The results demonstrated that substantial increases in stroke rate (P < 0.01) occurred at critical speed, and that these increases were related to a greater decrease in the duration of the power phase than the recovery phase (P < 0.01). The results also show that the degree of bilateral asymmetry was greater for the power phase than the recovery phase, and was inversely related to intensity in both phases of the stroke cycle. The findings of this study suggest that critical speed-related increases in stroke rate are an indirect consequence of increased force production in the power phase of the stroke, and that bilateral asymmetry is both intensity- and stroke-phase dependent.
本研究的主要目的是确定在自由泳中，力量相和恢复相在划频中的绝对时间关系，以响应在临界速度之前和之后发生的运动强度的渐进变化。第二个目的是确定强度相关的功率/恢复相关系的变化是否会影响划臂的双边对称性。在一个渐进的 200 米间歇训练组中，记录了每个 25 米的划臂参数，其中 8 名（2 名男性，6 名女性）国家级游泳运动员在低于、高于和临界速度的强度下游泳。结果表明，在临界速度下，划频显著增加（P<0.01），并且这些增加与力量相的持续时间比恢复相的持续时间减少更大有关（P<0.01）。结果还表明，双边不对称性在力量相大于恢复相，并且在划臂周期的两个相都与强度呈反比关系。本研究的结果表明，临界速度相关的划频增加是划臂力量相增加的间接结果，双边不对称性是强度和划臂相都依赖的。
