Pollastri L, Lanfranconi F, Tredici G, Burtscher M, Gatterer H
Department of Health Sciences, University of Milano-Bicocca, Monza, Italy.
Department of Surgery and Translational Medicine, University of Milano-Bicocca, Monza, Italy.
Int J Sports Med. 2016 Apr;37(4):329-33. doi: 10.1055/s-0035-1565105. Epub 2015 Dec 23.
An investigation of whether body water changes during the Giro d'Italia affected average maximal mean power (MMP) of different time durations and to establish whether phase-angle and body cell mass (BCM) are related to MMP in elite cyclists. Approximately 2 h after each stage of the race, a bioelectrical impedance analysis was performed on 8 cyclists and analysed according to bioelectrical impedance vector analyses. Additionally, MMP of different time durations were recorded during each stage. Body mass increased (p<0.001), vector-length shortened (p<0.001) and MMP15 (maximal mean power for 15 s; p=0.043) decreased in the course of the Giro d'Italia. The shortening of the vector was negatively related to MMP10 (r=- 0.749, p=0.032) and MMP15 (r=- 0.735, p=0.038) during stage 16 (heavy mountain-stage) and MMP60 (r=- 0.751, p=0.032), MMP300 (r=- 0.739, p=0.036) and MMP1800 (r=- 0.769, p=0.026) during stage 19 (time-trial). Additionally, the baseline phase-angle and BCM were associated to MMP15 best (r=0.781, p=0.022 and 0.756, p=0.030, respectively). In the course of the Giro d'Italia, MMP15 decreased, indicating progressive fatigue. The vector-length shortening and to some extent the body mass increase indicate that cyclists gained body water during the race. This gain was positively associated with performance during the last stages, possibly due to improved thermoregulation. Furthermore, phase-angle and BCM, shown to be linked to cellular function and to represent metabolic active tissue, reflect individual MMP of short duration in professional road cyclists.
一项关于环意大利自行车赛期间身体水分变化是否会影响不同时长的平均最大平均功率（MMP），以及确定相位角和身体细胞质量（BCM）与精英自行车运动员的MMP是否相关的研究。在比赛每个赛段结束约2小时后，对8名自行车运动员进行生物电阻抗分析，并根据生物电阻抗矢量分析进行分析。此外，在每个赛段记录不同时长的MMP。在环意大利自行车赛过程中，体重增加（p<0.001），矢量长度缩短（p<0.001），MMP15（15秒的最大平均功率；p=0.043）下降。在第16赛段（高山赛段），矢量长度缩短与MMP10（r=-0.749，p=0.032）和MMP15（r=-0.735，p=0.038）呈负相关，在第19赛段（计时赛），与MMP60（r=-0.751，p=0.032）、MMP300（r=-0.739，p=0.036）和MMP1800（r=-0.769，p=0.026）呈负相关。此外，基线相位角和BCM与MMP15的相关性最佳（分别为r=0.781，p=0.022和r=0.756，p=0.030）。在环意大利自行车赛过程中，MMP15下降，表明疲劳逐渐加重。矢量长度缩短以及在一定程度上体重增加表明自行车运动员在比赛期间身体水分增加。这种增加与最后几个赛段的表现呈正相关，可能是由于体温调节改善。此外，相位角和BCM与细胞功能相关且代表代谢活跃组织，反映了职业公路自行车运动员短时间的个体MMP。
