铁人三项运动员在低于个体无氧阈的不同强度恢复过程中血乳酸的清除情况。

Blood lactate removal during recovery at various intensities below the individual anaerobic threshold in triathletes.

作者信息

Baldari C, Videira M, Madeira F, Sergio J, Guidetti L

机构信息

University Institute of Motor Sciences (IUSM), Rome, Italy.

出版信息

J Sports Med Phys Fitness. 2005 Dec;45(4):460-6.

PMID:16446676

Abstract

AIM

Optimal lactate removal was reported to occur at work-rate between 30% and 70% VO2max. However, it has been recently recommended to quantify exercise intensity not in percentage of VO2max but in relation to validated metabolic reference points such as the individual anaerobic threshold (IAT) and the individual ventilatory threshold (IVT). The purpose of this study was to examine the effect on lactate removal of different recovery work-rates below the IAT defined calculating the difference (DT) between IAT and IVT, then choosing the IVT+50%DT, the IVT and the IVT-50%DT work-rates.

METHODS

Eight male triathletes (VO2max 69.7+/-4.7, VO2IAT 52.9+/-4, VO2IVT 41.1+/-4.7 mL x kg(-1) x min(-1)), after a 6-min treadmill run at 75% of difference between IAT and VO2max, performed in a random order the following 30-min recovery treatments: 1) run at IVT(plus;50%DT), 2) at IVT, 3) at IVT(-50%DT), 4) passive. Blood lactate was measured at 1, 3, 6, 9, 12, 15, 20, 25, 30 minutes of recovery.

RESULTS

All active recovery work-rates (from 50+/-5% to 67+/-4% VO2max) were within the range previously reported for optimal lactate removal, and significantly more efficient than passive recovery on lactate removal curve (% of accumulated lactate above rest value). However, significant differences (P<0.01) were found among active recovery intensities: the IVT(-50%DT) was the most efficient work-rate from the 9th minute to 30th minute.

CONCLUSIONS

In triathletes, the IVT(-50%DT) was the optimal work-rate for lactate removal; moreover none of the studied active work-rate showed further lactate decrease after the 20th minute of recovery.

摘要

目的

据报道，在最大摄氧量（VO₂max）的30%至70%之间的工作强度下，乳酸清除效果最佳。然而，最近有人建议，不应以VO₂max的百分比来量化运动强度，而应根据经过验证的代谢参考点，如个体无氧阈（IAT）和个体通气阈（IVT）来确定。本研究的目的是通过计算IAT与IVT之间的差值（DT），然后选择IVT + 50%DT、IVT和IVT - 50%DT的工作强度，来研究低于IAT的不同恢复工作强度对乳酸清除的影响。

方法

八名男性铁人三项运动员（VO₂max为69.7±4.7，VO₂IAT为52.9±4，VO₂IVT为41.1±4.7 mL·kg⁻¹·min⁻¹），在以IAT与VO₂max差值的75%在跑步机上跑6分钟后，按随机顺序进行以下30分钟的恢复治疗：1）以IVT（加50%DT）强度跑步，2）以IVT强度跑步，3）以IVT（减50%DT）强度跑步，4）被动恢复。在恢复的第1、3、6、9、12、15、20、25、30分钟测量血乳酸。