Universidade Estadual de Londrina, Departamento de Educação Física, Londrina, Brazil.
Int J Sports Med. 2009 Nov;30(11):808-13. doi: 10.1055/s-0029-1234055. Epub 2009 Aug 14.
Team sport match play requires athletes to perform a number of repeated shuttle sprints. However, the acute effects of these repeated sprint sequences on lactic acidosis and resulting autonomic state perturbation are not known. The aim of this study was to observe and compare the blood lactate and post-exercise cardiac autonomic responses of a repeated shuttle-sprint ability test with the 30-15 Intermittent Fitness Test (30-15 (IFT)); the latter test representing a standard for exhaustive supramaximal effort. Thirteen adult team sport players performed the repeated shuttle-sprint ability test and the 30-15 (IFT) on separate days in a counter-balanced order. The repeated shuttle-sprint ability test consisted of six repetitions of maximal 2x15 m shuttle sprints ( approximately 5 s) departing every 20 s, while the 30-15 (IFT) involved progressive 30 s shuttle runs interspersed with 15 s of passive recovery until exhaustion. Blood lactate was measured before and after the tests, while autonomic responses were assessed using immediate heart rate recovery and heart rate variability indices. Peak blood lactate (10.6+/-2.1 vs. 10.2+/-2.8 mM) and heart beats recovered in one minute after exercise cessation (36.4+/-7.8 vs. 39.3+/-7.9 bpm) were similar after both the repeated shuttle-sprint ability test and the 30-15 (IFT). With the exception of the vagal-related time-varying root mean square of successive R-R interval differences at each 30 s, which recovered earlier after the repeated shuttle-sprint ability test compared with 30-15 (IFT), all heart rate variability indices decreased similarly after both tests in comparison to baseline values. In conclusion, the repeated shuttle-sprint ability test was shown to induce comparable levels of lactic acidosis and post-exercise autonomic state as the 30-15 (IFT). These levels of metabolic and autonomic states are likely to occur during team sport match play.
团队运动比赛需要运动员进行多次重复的穿梭冲刺。然而，这些重复冲刺序列对乳酸酸中毒和由此产生的自主状态干扰的急性影响尚不清楚。本研究的目的是观察和比较重复穿梭冲刺能力测试和 30-15 间歇健身测试（30-15(IFT)）的血液乳酸和运动后心脏自主反应，后者代表了最大努力的 exhaustive 测试标准。13 名成年团队运动运动员在平衡的顺序下分别在不同的日子进行了重复穿梭冲刺能力测试和 30-15(IFT)。重复穿梭冲刺能力测试由六次最大 2x15 m 穿梭冲刺组成（大约 5 秒），每隔 20 秒出发一次，而 30-15(IFT)则涉及渐进式 30 秒穿梭跑步，每隔 15 秒进行一次被动恢复，直到力竭。在测试前后测量血液乳酸，同时使用即时心率恢复和心率变异性指数评估自主反应。两种测试后，运动停止后一分钟内的峰值血液乳酸（10.6+/-2.1 与 10.2+/-2.8 mM）和心率恢复（36.4+/-7.8 与 39.3+/-7.9 bpm）相似。除了重复穿梭冲刺能力测试后迷走神经相关的每 30 秒连续 R-R 间期差异的时变均方根值恢复较早外，与基线值相比，两种测试后所有心率变异性指数都相似下降。总之，重复穿梭冲刺能力测试显示可引起与 30-15(IFT)相似的乳酸酸中毒和运动后自主状态。这些代谢和自主状态的水平可能在团队运动比赛中发生。
