Kong Zhaowei, Lei On Kei, Sun Shengyan, Li Lei, Shi Qingde, Zhang Haifeng, Nie Jinlei
Faculty of Education, University of Macau, Macao, China.
Institute of Physical Education, Huzhou University, Huzhou, Zhejiang Province, China.
J Exerc Sci Fit. 2022 Apr;20(2):100-107. doi: 10.1016/j.jesf.2022.01.005. Epub 2022 Jan 26.
The purpose of this study was to investigate the effects of repeated sprint interval training (RSIT) under different hypoxic conditions in comparison with normoxic RSIT on cardiorespiratory fitness (CRF) and metabolic health in sedentary young women.
Sixty-two sedentary young women (age: 21.9 ± 2.8 years, peak oxygen uptake [V̇O] 25.9 ± 4.5 ml kg·min) were randomized into one of the four groups, including a normoxic RSIT group (N), RSIT simulating an altitude of 2500 m (H), RSIT simulating an incremental altitude of 2500-3400 m (H) and a non-exercise control group (C). The training intervention (80 × 6 s all-out cycling sprints with 9 s recovery) was performed three times/week for 4 weeks. Anthropometric measures, V̇O, fasting blood glucose and lipids were assessed during the follicular phase of the menstrual cycle before and after the intervention.
Compared with the control group, significant increases in V̇O were found in both hypoxic groups (H: +8.2%, < 0.001, = 0.52; H: +10.9%, < 0.05, = 0.99) but not in the N group (+3.6%, > 0.05, = 0.21) after the intervention, whereas the two hypoxic groups had no difference in V̇O. Blood glucose and lipids, and body composition remained unchanged in all groups.
The present study indicates that combining hypoxia with RSIT can enhance the improvement of CRF compared with normoxic RSIT alone in the sedentary young population. Yet, compared with RSIT under stable hypoxia, incremental hypoxia stress in the short-term does not additionally ameliorate CRF.
本研究旨在调查与常氧重复冲刺间歇训练（RSIT）相比，不同低氧条件下的RSIT对久坐不动的年轻女性心肺适能（CRF）和代谢健康的影响。
62名久坐不动的年轻女性（年龄：21.9±2.8岁，峰值摄氧量[V̇O₂]25.9±4.5 ml·kg⁻¹·min⁻¹）被随机分为四组之一，包括常氧RSIT组（N）、模拟海拔2500米的RSIT组（H₁）、模拟海拔从2500米递增至3400米的RSIT组（H₂）和非运动对照组（C）。训练干预（80次×6秒全力骑行冲刺，恢复9秒）每周进行3次，共4周。在干预前后月经周期的卵泡期评估人体测量指标、V̇O₂、空腹血糖和血脂。
与对照组相比，干预后低氧组（H₁：+8.2%，P<0.001，效应量=0.52；H₂：+10.9%，P<0.05，效应量=0.99）的V̇O₂显著增加，而常氧组（N）无显著增加（+3.6%，P>0.05，效应量=0.21），且两个低氧组的V̇O₂无差异。所有组的血糖、血脂和身体成分均保持不变。
本研究表明，与仅进行常氧RSIT相比，在久坐不动的年轻人群中，低氧与RSIT相结合可增强CRF的改善。然而，与稳定低氧条件下的RSIT相比，短期递增低氧应激并不能额外改善CRF。
