Lithuanian Sports University, Sporto 6, LT-44221 Kaunas, Lithuania.
Lithuanian Sports University, Sporto 6, LT-44221 Kaunas, Lithuania.
Respir Physiol Neurobiol. 2020 Jul;278:103439. doi: 10.1016/j.resp.2020.103439. Epub 2020 Apr 28.
We examined the effect of age and training status on the oxygen uptake (V˙ O) kinetics of untrained and recreationally trained women. Young (20-35yr), middle-age (40-55yr) and older (58-71yr) recreationally trained (YTR, n = 10; MTR, n = 12; OTR, n = 9) and untrained (YUT, n = 12; MUT, n = 10; OUT, n = 9) women participated in this crossectional study. Breath-by-breath V˙ O and near-infrared-spectroscopy-derived (NIRS) muscle deoxygenation [HHb] were monitored continuously during increasing and constant walking exercises. On-transition V˙ O and [HHb] responses to moderate intensity walking were modeled as mono-exponential. The data were normalized for each subject (0%-100 %), and [HHb]/ V˙ O ratio was calculated as the average [HHb]/ V˙ O during the 20- to 120-s period after the onset of moderate intensity walking exercise. The time constant of V˙ O (τ V˙ O) was longer in OUT(23.8 ± 2.4), MUT(25.4 ± 5.1), YUT(23.1 ± 3.4) than in YTR(16.2 ± 2.0), MTR(16.7 ± 3.9), OTR(16.3 ± 2.8) women (p < 0.05). The [HHb]/ V˙ O ratio in OUT (1.31 ± 0.18) was higher than in YTR(1.08 ± 0.05), MTR(1.13 ± 0.09), YUT(1.12 ± 0.09) (p < 0.05). It is concluded that recreationally trained women had faster V˙ O kinetics along with better matching of O delivery and utilization at the site of gas exchange in the exercising muscles.
我们研究了年龄和训练状态对未经训练和有规律训练的女性的耗氧量（V˙ O）动力学的影响。年轻（20-35 岁）、中年（40-55 岁）和老年（58-71 岁）有规律训练的女性（YTR，n = 10；MTR，n = 12；OTR，n = 9）和未经训练的女性（YUT，n = 12；MUT，n = 10；OUT，n = 9）参加了这项横断面研究。在逐渐增加和恒定步行运动过程中，连续监测逐口气的 V˙ O 和近红外光谱衍生的（NIRS）肌肉去氧合[HHb]。过渡到中等强度步行的 V˙ O 和[HHb]响应被建模为单指数。将数据归一化为每个个体（0%-100%），并计算[HHb]/ V˙ O 比值作为中等强度步行运动开始后 20-120 秒期间的平均[HHb]/ V˙ O。V˙ O 的时间常数（τ V˙ O）在 OUT（23.8 ± 2.4）、MUT（25.4 ± 5.1）、YUT（23.1 ± 3.4）中大于 YTR（16.2 ± 2.0）、MTR（16.7 ± 3.9）、OTR（16.3 ± 2.8）女性（p < 0.05）。OUT 中的[HHb]/ V˙ O 比值（1.31 ± 0.18）高于 YTR（1.08 ± 0.05）、MTR（1.13 ± 0.09）、YUT（1.12 ± 0.09）（p < 0.05）。研究结论表明，有规律训练的女性在进行肌肉锻炼时，V˙ O 动力学更快，并且在氧气输送和利用方面与气体交换部位的匹配更好。
