在 2500 米到 4300 米处居住两天不会影响随后在 4300 米处的运动表现。

Two-Day Residence at 2500 m to 4300 m Does Not Affect Subsequent Exercise Performance at 4300 m.

机构信息

Thermal and Mountain Medicine Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA.

出版信息

Med Sci Sports Exerc. 2019 Apr;51(4):744-750. doi: 10.1249/MSS.0000000000001843.

DOI:10.1249/MSS.0000000000001843

PMID:30439786

Abstract

PURPOSE

To determine the efficacy residing for 2 d at various altitudes while sedentary (S) or active (A; ~90 min hiking 2 d) on exercise performance at 4300 m.

METHODS

Sea-level (SL) resident men (n = 45) and women (n = 21) (mean ± SD; 23 ± 5 yr; 173 ± 9 cm; 73 ± 12 kg; V˙O2peak = 49 ± 7 mL·kg·min) were randomly assigned to a residence group and, S or A within each group: 2500 m (n = 11S, 8A), 3000 m (n = 6S, 12A), 3500 m (n = 6S, 8A), or 4300 m (n = 7S, 8A). Exercise assessments occurred at SL and 4300 m after 2-d residence and consisted of 20 min of steady-state (SS) treadmill walking (45% ± 3% SL V˙O2peak) and a 5-mile, self-paced running time trial (TT). Arterial oxygen saturation (SpO2) and HR were recorded throughout exercise. Resting SpO2 was recorded at SL, at 4 and 46 h of residence, and at 4300 m before exercise assessment. To determine if 2-d altitude residence improved 4300 m TT performance, results were compared with estimated performances using a validated prediction model.

RESULTS

For all groups, resting SpO2 was reduced (P < 0.01) after 4 h of residence relative to SL inversely to the elevation and did not improve after 46 h. Resting SpO2 (~83%) did not differ among groups at 4300 m. Although SL and 4300 m SS exercise SpO2 (97% ± 2% to 74% ± 4%), HR (123 ± 10 bpm to 140 ± 12 bpm) and TT duration (51 ± 9 to 73 ± 16 min) were different (P < 0.01), responses at 4300 m were similar among all groups, as was actual and predicted 4300 m TT performances (74 ± 12 min).

CONCLUSIONS

Residing for 2 d at 2500 to 4300 m, with or without daily activity, did not improve resting SpO2, SS exercise responses, or TT performance at 4300 m.

摘要

目的

在不同海拔高度 sedentary（S）或 active（A；~90 分钟徒步旅行 2 天）2 天后，确定在 4300 米海拔高度进行运动表现的疗效。

方法

海平面（SL）居民男性（n=45）和女性（n=21）（平均值±标准差；23±5 岁；173±9 厘米；73±12 千克；V˙O2peak=49±7 mL·kg·min）被随机分配到一个居住组，并在每个组内进行 S 或 A：2500 米（n=11S，8A）、3000 米（n=6S，12A）、3500 米（n=6S，8A）或 4300 米（n=7S，8A）。在 2 天居住后，在 SL 和 4300 米处进行运动评估，包括 20 分钟稳态（SS）跑步机步行（45%±3%SL V˙O2peak）和 5 英里，自我计时跑步时间试验（TT）。在整个运动过程中记录动脉血氧饱和度（SpO2）和心率。在 SL、居住 4 小时和 46 小时以及在运动评估前在 4300 米处记录静息 SpO2。为了确定 2 天的海拔居住是否改善了 4300 米 TT 表现，使用验证的预测模型比较了结果与估计表现。

结果

对于所有组，与 SL 相比，居住 4 小时后静息 SpO2降低（P<0.01），与海拔呈反比，而在 46 小时后没有改善。在 4300 米处，各组之间的静息 SpO2没有差异。尽管 SL 和 4300 米 SS 运动 SpO2（97%±2%至 74%±4%）、心率（123±10 bpm 至 140±12 bpm）和 TT 持续时间（51±9 至 73±16 分钟）不同（P<0.01），但所有组在 4300 米处的反应相似，实际和预测的 4300 米 TT 表现也相似（74±12 分钟）。