Johansen Jan-Michael, Sunde Arnstein, Helgerud Jan, Støren Øyvind
Department of Sports, Physical Education and Outdoor Studies, University of Southeastern Norway, Bø, Norway.
Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
Front Physiol. 2022 Feb 28;13:829758. doi: 10.3389/fphys.2022.829758. eCollection 2022.
To investigate the relationships between maximal aerobic speed (MAS), lactate threshold in per cent of peak oxygen uptake (LT) and velocity at LT (LT) in cross-country skiers. Secondly, we aimed to explore the fit of an equation previously used in cyclists and runners in a cohort of well-trained, competitive cross-country skiers for calculation of LT. Thirdly, we aimed to investigate if a new LT could still be calculated after a period of regular training only by providing a new MAS.
Ninety-five competitive cross-country skiers (65 males and 30 females) were tested for maximal oxygen uptake (VO), peak oxygen uptake in double poling (DP-VO), oxygen cost of double poling (C), LT, and LT. Thirty-five skiers volunteered to be tested 3 months later to evaluate potential changes in LT and LT.
Velocity at LT was mainly determined by MAS ( = 0.88, < 0.01). LT did not show a significant impact on LT. The product of MAS·LT precisely predicted LT at baseline ( = 0.99, SEE = 2.4%), and by only measuring MAS, a new LT could be accurately calculated ( = 0.92, SEE = 6.8%) 3 months later in a sub-set of the initial 95 skiers ( = 35).
The results suggest that LT has minor impact on LT in DP tested in a laboratory. LT seemed to be predominantly determined by MAS, and we suggest to put more focus on MAS and less on LT and LT in regular testing to evaluate aerobic performance capacity in DP.
研究越野滑雪运动员的最大有氧速度（MAS）、以最大摄氧量百分比表示的乳酸阈值（LT）以及乳酸阈值时的速度（LT）之间的关系。其次，我们旨在探讨先前用于自行车运动员和跑步运动员的一个方程在一组训练有素的竞技越野滑雪运动员中计算LT的适用性。第三，我们旨在研究在经过一段时间的常规训练后，是否仅通过提供新的MAS仍可计算出新的LT。
对95名竞技越野滑雪运动员（65名男性和30名女性）进行了最大摄氧量（VO）、双杖滑雪时的最大摄氧量（DP-VO）、双杖滑雪的氧耗（C）、LT和LT测试。35名滑雪运动员自愿在3个月后接受测试，以评估LT和LT的潜在变化。
LT时的速度主要由MAS决定（=0.88，<0.01）。LT对LT没有显著影响。MAS·LT的乘积在基线时能精确预测LT（=0.99，标准误=2.4%），并且仅通过测量MAS，在最初95名滑雪运动员的一个子集（=35）中，3个月后可以准确计算出新的LT（=0.92，标准误=6.8%）。
结果表明，在实验室测试的双杖滑雪中，LT对LT的影响较小。LT似乎主要由MAS决定，我们建议在常规测试中更多地关注MAS，而减少对LT和LT的关注，以评估双杖滑雪中的有氧运动能力。
