Bassan Natália M, César Tadeu E A S, Denadai Benedito S, Greco Camila C
Human Performance Laboratory, São Paulo State University, São Paulo, Brazil.
Int J Sports Physiol Perform. 2016 Jan;11(1):33-9. doi: 10.1123/ijspp.2014-0310. Epub 2015 Apr 7.
To analyze the relationship between the responses of isometric peak torque (IPT) and maximal rate of force development (RFDmax) with the changes in stroking parameters in an exhaustive exercise performed in front crawl.
Fifteen male swimmers performed, on different days, the following protocols: maximal 400-m trial, strength tests before and after an exhaustive test at 100% of the mean speed obtained during the 400-m test, and the same procedures on day 2.
The IPT of elbow flexors (79.9 ± 19.4 and 66.7 ± 20.0 N·m) and elbow extensors (95.1 ± 28.0 N·m and 85.8 ± 30.5 N·m) was decreased after the swim test, as was RFDmax (521.8 ± 198.6 and 426.0 ± 229.9 N·m/s; 420.6 ± 168.2 and 384.0 ± 143.5 N·m/s, respectively). Stroke length decreased during the swim test (1.96 ± 0.22 and 1.68 ± 0.29 m/stroke), while stroke rate increased (37.2 ± 3.14 and 41.3 ± 4.32 strokes/min). The propulsive phases increased while the nonpropulsive phases decreased during the test. Significant correlation was found between the changes in IPT and stroke length, stroke rate and recovery (elbow flexors), and entry and catch phase (elbow extensors). In addition, significant correlation was found between the changes in RFDmax of elbow flexors with the changes in pull and recovery phases.
Changes in swim technique during an exhaustive test can be, at least in part, associated with fatigue of the arm muscles.
分析在进行的自由泳力竭运动中，等长收缩峰值扭矩（IPT）和最大力量发展速率（RFDmax）的反应与划水参数变化之间的关系。
15名男性游泳运动员在不同日期进行了以下方案：400米最大测试、在以400米测试中获得的平均速度的100%进行力竭测试前后的力量测试，以及在第2天进行相同程序。
游泳测试后，肘屈肌的IPT（79.9±19.4和66.7±20.0牛·米）和肘伸肌的IPT（95.1±28.0牛·米和85.8±30.5牛·米）降低，RFDmax也降低（分别为521.8±198.6和426.0±229.9牛·米/秒；420.6±168.2和384.0±143.5牛·米/秒）。游泳测试期间划水长度降低（1.96±0.22和1.68±0.29米/划水），而划水频率增加（37.2±3.14和41.3±4.32划水/分钟）。测试期间推进阶段增加而非推进阶段减少。发现IPT的变化与划水长度、划水频率和恢复（肘屈肌）以及入水和抓水阶段（肘伸肌）之间存在显著相关性。此外，发现肘屈肌RFDmax的变化与划水和恢复阶段的变化之间存在显著相关性。
力竭测试期间游泳技术的变化至少部分与手臂肌肉疲劳有关。
