Edge Johann, Bishop David, Goodman Carmel
Team Sport Research Group, School of Human Movement and Exercise Science, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia.
Eur J Appl Physiol. 2006 Jan;96(1):97-105. doi: 10.1007/s00421-005-0068-6. Epub 2005 Nov 10.
We examined changes in muscle buffer capacity (beta m(in vitro)), VO2peak and the lactate threshold (LT) after 5 weeks of high-intensity interval training (INT) above the LT or moderate-intensity continuous training (CON) just below the LT. Prior to and immediately after training, 16 female subjects performed a graded exercise test to determine VO2peak and the LT, followed 2 days later by a resting muscle biopsy from the vastus lateralis muscle to determine beta m(in vitro). Following baseline testing, the subjects were randomly placed into the INT (n=8) or CON training group (n=8). Subjects then performed 5 weeks of cycle training (3 days per week), performing either high-intensity INT (6-10x2 min at 120-140% LT with 1 min rest) or moderate-intensity CON (80-95% LT) training. Total training volume was matched between the two groups. After the training period, both groups had significant improvements in VO2peak (12-14%; P<0.05) and the LT (7-10%; P<0.05), with no significant differences between groups. The INT group, however, had significantly greater improvements in beta m(in vitro) (25%; 123+/-5-153+/-7 micromol H+ x g muscle dm(-1) x pH(-1); P<0.05) than the CON group (2%; 130+/-12-133+/-7 micromol H+ x g muscle dm(-1) x pH(-1), P>0.05). Our results show that when matched for training volume, high-intensity interval training above the LT results in similar improvements in VO2peak and the LT, but greater improvements in beta m(in vitro) than moderate-intensity continuous training below the LT. This suggests that training intensity is an important determinant of changes to beta m(in vitro).
我们研究了在高于乳酸阈值（LT）的高强度间歇训练（INT）或略低于LT的中等强度持续训练（CON）5周后，肌肉缓冲能力（βm（体外））、最大摄氧量（VO2peak）和乳酸阈值（LT）的变化。在训练前和训练后即刻，16名女性受试者进行了分级运动测试以确定VO2peak和LT，2天后从股外侧肌进行静息肌肉活检以确定βm（体外）。在基线测试后，受试者被随机分为INT组（n = 8）或CON训练组（n = 8）。然后受试者进行5周的自行车训练（每周3天），进行高强度INT（6 - 10次，每次2分钟，强度为120 - 140%LT，休息1分钟）或中等强度CON（80 - 95%LT）训练。两组的总训练量相匹配。训练期结束后，两组的VO2peak（12 - 14%；P < 0.05）和LT（7 - 10%；P < 0.05）均有显著改善，两组之间无显著差异。然而，INT组的βm（体外）改善程度（25%；123±5 - 153±7微摩尔H⁺×克肌肉干重⁻¹×pH⁻¹；P < 0.05）显著大于CON组（2%；130±12 - 133±7微摩尔H⁺×克肌肉干重⁻¹×pH⁻¹，P > 0.05）。我们的结果表明，当训练量相匹配时，高于LT的高强度间歇训练在VO2peak和LT方面的改善相似，但在βm（体外）方面的改善大于低于LT的中等强度持续训练。这表明训练强度是βm（体外）变化的重要决定因素。
