Department of Kinesiology, University of New Hampshire, Durham, New Hampshire 03824, USA.
J Strength Cond Res. 2010 Jan;24(1):120-7. doi: 10.1519/JSC.0b013e3181c3b429.
The purpose of this study was to examine the effects of level vs. graded skate skiing on capillary blood lactate (B(La)), heart rate (HR), oxygen consumption (V(O2)), and training intensity prescriptions. Eleven Nordic skiers completed 2 submaximal skate roller skiing treadmill protocols during which intensity was increased either by grade (G(inc)) or by speed (S(inc)). The protocols were compared for prethreshold BLa, HR, and V(O2) at lactate threshold (LT) and the HR/V(O2) relationship. Additionally, double-pole (primarily upper body) and skating (arms and legs combined) protocols were used to measure peak V(O2) and peak HR. Heart rate and V(O2) at LT were lower during G(inc) compared with S(inc) (154.9 +/- 6.8 b.min(-1) vs. 162.0 +/- 9.1 b.min(-1) and 46.3 +/- 2.8 ml.kg(-1).min(-1) vs. 49.1 +/- 1.6 ml.kg(-1).min(-1), respectively, both p < 0.01). Pre-threshold B(La) and the HR/V(O2) relationship were not different between the submaximal protocols. V(O2) and HRpeak were higher in skating compared with double poling (64.6 +/- 1.8 ml.kg(-1).min(-1) vs. 60.3 +/- 2.8 ml.kg(-1).min(-1), 192.6 +/- 5.8 b.min(-1) vs. 187.8 +/- 6.7 b.min(-1), respectively, both p < 0.01). Greater reliance on upper-body musculature during graded skiing and its associated lower aerobic capacity increases B(La) when compared with level skiing. The leftward shift in the B(La) vs. intensity curve during uphill skiing should be recognized to properly prescribe training intensity as well as interpret laboratory results.
本研究的目的是检验定坡度和分级坡度滑雪对毛细血管血乳酸（B(La)）、心率（HR）、耗氧量（V(O2))和训练强度处方的影响。11 名北欧滑雪者完成了 2 个次最大强度的滑雪滚轴跑步机测试，其中强度分别通过坡度（G(inc)）或速度（S(inc)）增加。比较了两种方案在乳酸阈（LT）时的预阈 BLa、HR 和 V(O2)，以及 HR/V(O2)关系。此外，还使用双杖（主要是上半身）和滑冰（手臂和腿部结合）方案来测量最大摄氧量和最大心率。与 S(inc)相比，G(inc)时的 LT 时的 HR 和 V(O2)更低（分别为 154.9 +/- 6.8 b.min(-1) 与 162.0 +/- 9.1 b.min(-1)，46.3 +/- 2.8 ml.kg(-1).min(-1) 与 49.1 +/- 1.6 ml.kg(-1).min(-1)，均 p < 0.01）。次最大方案之间的预阈 B(La)和 HR/V(O2)关系没有差异。与双杖相比，滑冰时的 V(O2)和 HRpeak 更高（分别为 64.6 +/- 1.8 ml.kg(-1).min(-1) 与 60.3 +/- 2.8 ml.kg(-1).min(-1)，192.6 +/- 5.8 b.min(-1) 与 187.8 +/- 6.7 b.min(-1)，均 p < 0.01）。与平地滑雪相比，分级滑雪时更多地依赖上半身肌肉，其相关的低有氧能力增加了 B(La)。在上坡滑雪时 B(La)与强度曲线的左移应该被认识到，以便正确地规定训练强度和解释实验室结果。
