School of Sport, Health and Exercise Science, University of Portsmouth, Portsmouth, UK.
Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia.
Physiol Rep. 2022 Jun;10(12):e15361. doi: 10.14814/phy2.15361.
Pulmonary oxygen uptake ( ) kinetics have been well studied during land-based exercise. However, less is known about kinetics during swimming exercise and comparisons between strokes is non-existent. We aimed to characterize and compare the kinetics, ventilatory,e and metabolic response to constant velocity moderate-intensity freely breathing front crawl (FC) and breaststroke (BR) swimming in a swimming flume. These two strokes reflect predominantly upper body versus lower body modes of swimming locomotion, respectively. Eight trained swimmers (4 females, 20 ± 1 years, 1.74 ± 0.06 m; 66.8 ± 6.3 kg) attended 5-6 laboratory-based swimming sessions. The first two trials determined FC and BR and the ventilatory threshold (VT), respectively, during progressive intensity swimming to the limit of tolerance. Subsequent trials involved counterbalanced FC and BR transitions from prone floating to constant velocity moderate-intensity swimming at 80% of the velocity at VT (vVT), separated by 30-min recovery. Breath-by-breath changes in pulmonary gas exchange and ventilation were measured continuously using a snorkel and aquatic metabolic cart system. The ventilatory and metabolic responses were similar (p > 0.05) between strokes during maximal velocity swimming, however, vVT and maximal velocity were slower (p < 0.05) during BR . During moderate-intensity swimming, kinetics, ventilatory and metabolic parameters were similar (p > 0.05) between strokes. In conclusion, when breathing ad libitum, kinetics during moderate-intensity constant velocity swimming, and ventilatory and metabolic responses during moderate-intensity and maximal velocity swimming, are similar between FC and BR strokes.
肺部氧气摄取（ ）动力学在陆地运动中已得到充分研究。然而，对于游泳运动中的 动力学知之甚少，而且两种泳姿之间的比较也不存在。我们旨在描述和比较恒定速度中等强度自由呼吸爬泳（FC）和蛙泳（BR）游泳时的 动力学、通气、代谢反应，这些两种泳姿分别反映了主要的上半身和下半身游泳运动模式。8 名训练有素的游泳运动员（4 名女性，20±1 岁，1.74±0.06m；66.8±6.3kg）参加了 5-6 次实验室游泳测试。前两次试验分别确定了渐进强度游泳至耐受极限时的 FC 和 BR 以及通气阈（VT）。随后的试验涉及从俯伏漂浮到以 VT 速度的 80%（vVT）的恒定速度中等强度游泳的 FC 和 BR 交替，两者之间间隔 30 分钟恢复。使用通气管和水上代谢箱系统连续测量肺部气体交换和通气的逐口气变化。在最大速度游泳时，两种泳姿的通气和代谢反应相似（p>0.05），但 BR 的 vVT 和最大速度较慢（p<0.05）。在中等强度游泳时，两种泳姿的 动力学、通气和代谢参数相似（p>0.05）。总之，在自由呼吸时，中等强度恒定速度游泳时的 动力学，以及中等强度和最大速度游泳时的通气和代谢反应，在 FC 和 BR 泳姿之间是相似的。
