Department of Sport & Exercise Science, University of Portsmouth, Portsmouth, United Kingdom.
J Strength Cond Res. 2012 Oct;26(10):2729-33. doi: 10.1519/JSC.0b013e3182429af8.
The occurrence of inspiratory muscle fatigue (IMF) has been documented after front crawl (FC) swimming of various distances. Whether IMF occurs after other competitive swimming strokes is not known. The aim of the present study was to assess the impact of all 4 competitive swimming strokes on the occurrence of IMF after race-paced swimming and to determine whether the magnitude of IMF was related to the breathing pattern adopted and hence breathing frequency (f(b)). Eleven, nationally ranked, youth swimmers completed four 200-m swims (one in each competitive stroke) on separate occasions. The order of the swims, which consisted of FC, backstroke (BK), breaststroke (BR), and butterfly (FLY), was randomized. Maximal inspiratory mouth pressure (MIP) was assessed before (after a swimming and inspiratory muscle warm-up) and after each swim with f(b) calculated post swim from recorded data. Inspiratory muscle fatigue was evident after each 200-m swim (p < 0.05) but did not differ between the 4 strokes (range 18-21%). No relationship (p > 0.05) was observed between f(b) and the change in MIP (FC: r = -0.456; BK: r = 0.218; BR: r = 0.218; and FLY: r = 0.312). These results demonstrate that IMF occurs in response to 200-m race-paced swimming in all strokes and that the magnitude of IMF is similar between strokes when breathing is ad libitum occurring no less than 1 breath (inhalation) every third stroke.
吸气肌疲劳（IMF）在各种距离的自由泳（FC）游泳后已经被记录下来。其他竞技游泳姿势后是否会发生 IMF 尚不清楚。本研究的目的是评估所有 4 种竞技游泳姿势对比赛节奏游泳后 IMF 发生的影响，并确定 IMF 的严重程度是否与采用的呼吸模式有关，从而与呼吸频率（f(b)）有关。11 名全国排名的青年游泳运动员在不同场合分别完成了 4 次 200 米游泳（每种竞技泳姿一次）。游泳顺序为 FC、仰泳（BK）、蛙泳（BR）和蝶泳（FLY），随机排列。在游泳和吸气肌热身之前（游泳后）和每次游泳后评估最大吸气口腔压力（MIP），并从记录的数据中计算游泳后的 f(b)。每次 200 米游泳后都出现了吸气肌疲劳（p<0.05），但 4 种泳姿之间没有差异（范围为 18-21%）。f(b)与 MIP 的变化之间没有观察到关系（p>0.05）（FC：r=-0.456；BK：r=0.218；BR：r=0.218；FLY：r=0.312）。这些结果表明，IMF 是对所有泳姿 200 米比赛节奏游泳的反应，并且当呼吸是自由的时，IMF 的严重程度在泳姿之间相似，每个第三下呼吸至少发生一次呼吸（吸气）。
