Effects of high- and moderate-intensity training on metabolism and repeated sprints
Effects of high- and moderate-intensity training on metabolism and repeated sprints
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DOI：
10.1249/01.mss.0000175855.35403.4c
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发表时间：
2005-11-01
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影响因子：
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通讯作者：
Dawson, B
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文献类型：
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作者：
Edge, J;Bishop, D;Dawson, B
目的：比较高强度间歇训练(HIT)和中等强度连续训练(MIT)对重复短跑能力(RSA)和肌肉代谢的影响。方法：对20名女性运动员进行训练前后的VO2峰值、乳酸阈值(LT)和负重负荷(5×6-S短跑，每30次S)进行评定。在RSA测试之前和之后，取股外侧肌的肌肉活组织检查。受试者进行RSA匹配，随机分为HIT组(N=10)或MIT组(N=10)，进行5wk(3d(.)wk(-1))的周期训练；进行HIT(6-10，以120-140%LT间隔2min)或MIT(连续，以80-95%LT，20-30min)训练。结果：两组VO2峰值(10-12%；P<；0.05)和LT(8-10%；P<；0.05)均有显著改善，但两组间差异无统计学意义。两组的RSA总作业量(KJ)也有显著增加(P<；0.05)，HIT后的增加幅度明显大于MIT(分别为13%和8.5%；P<；0.05)。两组静息[ATP]显著降低，运动后[La-](B)显著升高，但两组间无显著差异。训练结束后，安静或运动后的[Pcr]、[Cr]、肌肉[La-]或[H+]均无明显变化。结论：当总工作量匹配时，HIT在RSA方面比MIT有更大的改善。这是因为在连续的短跑中保持成绩的能力有所提高，这不能用第一次短跑期间的工作差异、有氧健身或短跑结束时的代谢物积累来解释。
Purpose: We compared the effects of high-intensity interval (HIT) and moderate-intensity continuous (MIT) training (matched for total work) on changes in repeated-sprint ability (RSA) and muscle metabolism. Methods: Pre- and posttraining, VO2peak, lactate threshold (LT), and RSA (5 x 6-s sprints, every 30 s) were assessed in 20 females. Before and immediately after the RSA test, muscle biopsies were taken from the vastus lateralis. Subjects were matched on RSA, randomly placed into the HIT (N = 10) or MIT (N = 10) group and performed 5 wk (3 d(.)wk(-1)) of cycle training; performing either HIT (6-10,2-min intervals at 120-140% LT) or MIT (continuous, 20-30 min at 80-95% LT). Results: Both groups had significant improvements in VO2peak (10-12%; P < 0.05) and LT (8-10%; P < 0.05), with no significant differences between them. Both groups also had significant increases in RSA total work (kJ) (P < 0.05), with a significantly greater increase following HIT than MIT (13 vs 8.5%, respectively; P < 0.05). There was a significant decrease in resting [ATP] and an increase in postexercise [La-](b) for both groups, but no significant differences between them. There were no significant changes in resting or postexercise [PCr], [Cr], muscle [La-], or [H+] after the training period. Conclusions: When total work is matched, HIT results in greater improvements in RSA than MIT. This results from an improved ability to maintain performance during consecutive sprints, which is not explained by differences in work done during the first sprint, aerobic fitness or metabolite accumulation at the end of the sprints.