目的:比较自定进度4分钟双极化(DP)时间试验(TTDP)与4分钟对角跨步(DS)时间试验(TTDS)之间的生理反应。峰值摄氧量的相对重要性([公式:见正文]O2峰),厌氧能力,还检查了预测4分钟TTDP和TTDS轮滑性能的总效率(GE)。
方法:16名训练有素的男子越野滑雪者表演,在不同场合的每种子技术中,一个8×4分钟的增量次最大协议,为了评估个体代谢率(MR)与功率输出(PO)的关系,然后是10分钟的被动断裂,然后是TTDP或TTDS,子技术之间的随机顺序。
结果:与TTDS相比,TTDP导致总MR降低10±7%,5±4%的有氧MR降低,30±37%的低厌氧MR,通用电气下跌4.7±1.2个百分点,这导致PO降低32±4%(均P<0.01)。[公式:见正文]O2峰和厌氧能力分别降低4±4%和30±37%,分别,DP优于DS(均P<0.01)。两种时间试验(TT)表现的PO没有显着相关(R2=0.044)。在两个TT期间使用类似的抛物线起搏策略。多变量数据分析使用[公式:见正文]O2peak预测TT性能,厌氧能力,和GE(TTDP,R2=0.974;TTDS,R2=0.848)。变量对[公式:见正文]O2峰的投影值的影响,厌氧能力,GE支持TTDP,分别为1.12±0.60、1.01±0.72和0.83±0.38,和TTDS,分别为1.22±0.35、0.93±0.44和0.75±0.19。
结论:结果表明,越野滑雪者的“代谢概况”和表现能力具有高度的亚技术特异性,并且4分钟TT表现由生理因素区分,例如[公式:见文本]O2peak,厌氧能力,和GE。
OBJECTIVE: To compare physiological responses between a self-paced 4-min double-poling (DP) time-trial (TTDP) versus a 4-min diagonal-stride (DS) time-trial (TTDS). The relative importance of peak oxygen uptake ([Formula: see text]O2peak), anaerobic capacity, and gross efficiency (GE) for projection of 4-min TTDP and TTDS roller-skiing performances were also examined.
METHODS: Sixteen highly trained male cross-country skiers performed, in each sub-technique on separate occasions, an 8 × 4-min incremental submaximal protocol, to assess individual metabolic rate (MR) versus power output (PO) relationships, followed by a 10-min passive break and then the TTDP or TTDS, with a randomized order between sub-techniques.
RESULTS: In comparison to TTDS, the TTDP resulted in 10 ± 7% lower total MR, 5 ± 4% lower aerobic MR, 30 ± 37% lower anaerobic MR, and 4.7 ± 1.2 percentage points lower GE, which resulted in a 32 ± 4% lower PO (all P < 0.01). The [Formula: see text]O2peak and anaerobic capacity were 4 ± 4% and 30 ± 37% lower, respectively, in DP than DS (both P < 0.01). The PO for the two time-trial (TT) performances were not significantly correlated (R2 = 0.044). Similar parabolic pacing strategies were used during both TTs. Multivariate data analysis projected TT performance using [Formula: see text]O2peak, anaerobic capacity, and GE (TTDP, R2 = 0.974; TTDS, R2 = 0.848). The variable influence on projection values for [Formula: see text]O2peak, anaerobic capacity, and GE were for TTDP, 1.12 ± 0.60, 1.01 ± 0.72, and 0.83 ± 0.38, respectively, and TTDS, 1.22 ± 0.35, 0.93 ± 0.44, and 0.75 ± 0.19, respectively.
CONCLUSIONS: The results show that a cross-country skier\'s \"metabolic profile\" and performance capability are highly sub-technique specific and that 4-min TT performance is differentiated by physiological factors, such as [Formula: see text]O2peak, anaerobic capacity, and GE.