Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
School of Sport Sciences, Faculty of Health Sciences, UiT The Arctic University of Norway, Tromsø, Norway.
Eur J Appl Physiol. 2021 Aug;121(8):2229-2241. doi: 10.1007/s00421-021-04689-2. Epub 2021 Apr 24.
This study aimed to compare physiological factors and cycle characteristics during cross-country (XC) roller-skiing at matched inclines and speeds using the double-poling (DP) and diagonal-stride (DS) sub-techniques in junior female and male XC skiers.
Twenty-three well-trained junior XC skiers (11 women, 12 men; age 18.2 ± 1.2 yr.) completed two treadmill roller-skiing tests in a randomized order using either DP or DS. The exercise protocols were identical and included a 5 min warm-up, 4 × 5 min submaximal stages, and an incremental test to exhaustion, all performed at a 5° incline.
No significant three-way interactions were observed between sex, submaximal exercise intensity, and sub-technique. For the pooled sample, higher values were observed for DP versus DS during submaximal exercise for the mean oxygen uptake kinetics response time (33%), energy cost (18%), heart rate (HR) (9%), blood lactate concentration (5.1 versus 2.1 mmol·L), rating of perceived exertion (12%), and cycle rate (25%), while cycle length was lower (19%) (all P < 0.001). During the time-to-exhaustion (TTE) test, peak oxygen uptake ([Formula: see text]Opeak), peak HR, and peak oxygen pulse were 8%, 2%, and 6% lower, respectively, for DP than DS, with a 29% shorter TTE during DP (pooled data, all P < 0.001).
In well-trained junior XC skiers, DP was found to exert a greater physiological load than DS during uphill XC roller-skiing at submaximal intensities. During the TTE test, both female and male athletes were able to ski for longer and reached markedly higher [Formula: see text]Opeak values when using DS compared to DP.
本研究旨在比较使用双支撑（DP）和对角步（DS）两种支撑技术在匹配坡度和速度下进行越野（XC）滚轴滑雪时，青少年男、女 XC 滑雪者的生理因素和周期特征。
23 名训练有素的青少年 XC 滑雪者（11 名女性，12 名男性；年龄 18.2±1.2 岁）以随机顺序使用 DP 或 DS 完成了两次跑步机滚轴滑雪测试。运动方案完全相同，包括 5 分钟热身，4×5 分钟亚最大强度阶段，以及递增至力竭的测试，所有测试均在 5°的坡度上进行。
未观察到性别、亚最大运动强度和支撑技术之间存在显著的三向交互作用。对于 pooled 样本，在亚最大运动强度下，DP 相对于 DS 观察到更高的值，包括平均摄氧量动力学响应时间（33%）、能量消耗（18%）、心率（HR）（9%）、血乳酸浓度（5.1 与 2.1mmol·L）、感知运动强度（12%）和周期率（25%），而周期长度更短（19%）（所有 P<0.001）。在力竭时间（TTE）测试中，DP 比 DS 的峰值摄氧量（[Formula: see text]Opeak）、峰值 HR 和峰值氧脉搏分别低 8%、2%和 6%，DP 的 TTE 短 29%（pooled data，所有 P<0.001）。
在训练有素的青少年 XC 滑雪者中，在亚最大强度下进行 XC 滚轴滑雪时，DP 比 DS 产生更大的生理负荷。在 TTE 测试中，女性和男性运动员使用 DS 滑雪的时间都更长，并且与 DP 相比，达到了明显更高的 [Formula: see text]Opeak 值。
