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首页> 外文期刊>Medicine and science in sports and exercise >Evaluation of stress responses to interval training at low and moderate altitudes.
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Evaluation of stress responses to interval training at low and moderate altitudes.

机译：评估在低海拔和中等高度进行间歇训练时的压力反应。

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PURPOSE: The purpose of the present field study was to explore whether extensive interval training (IT) performed with a similar behavior of blood lactate (LA) at an altitude of 1800 m (ALT) and near sea level (SL) goes along with a comparable hormonal, metabolic, and acute phase response in highly trained endurance athletes. METHODS: Twelve distance runners (VO2 64.6 +/- 6.9 mL.kg(-1) ) performed IT (10 x 1000 m, 2-min rest) at SL with a running velocity (V) corresponding to 112% of the individual anaerobic threshold (IAT). After an acclimatization period of 7 d, IT was repeated with a lower V (107% IAT) at ALT. Blood samples were drawn at rest, 0, 0.3, 3, and 24 h after IT. LA during IT was similar at SL and ALT (5.4 +/- 1.3/5.3 +/- 1.2 mmol.L(-1)), whereas HR tended to be higher at SL. RESULTS: Postexercise rises in plasma noradrenaline (NA), NA sulfate, adrenaline, glucose, interleukin-6 (IL-6), and neutrophils were significantly more pronounced at ALT. The increase of cortisol and human growth hormone showed an insignificant trend toward higher values at ALT. A slight but significant increase of plasma erythropoietin was only apparent after IT at ALT. No differences between either condition were observed for exercise-related changes in free fatty acids, IL-8, lympho-, or monocyte counts. CONCLUSIONS: In spite of a matched accumulation pattern of LA between ALT and N, stress responses, such as sympathetic activation and hepatic glucose release, still appear to be greater at ALT. This additional impact of moderate ALT on the stress response to IT should be taken into account if repeated training sessions are performed within a short period of time.
机译：目的：本实地研究的目的是探讨在1800 m（ALT）和近海平面（SL）处以类似血乳酸（LA）行为进行的大范围间歇训练（IT）是否与在训练有素的耐力运动员中可比较的激素，代谢和急性期反应。方法：十二名长跑运动员（VO2 64.6 +/- 6.9 mL.kg（-1））在SL下进行IT（10 x 1000 m，静置2分钟），其运行速度（V）相当于单个厌氧菌的112％阈值（IAT）。适应7天后，以ALT较低的V（107％IAT）重复IT。在IT后0、0.3、3和24小时休息时抽取血样。 IT期间的LA与SL和ALT相似（5.4 +/- 1.3 / 5.3 +/- 1.2 mmol.L（-1）），而HR倾向于SL更高。结果：运动后血浆去甲肾上腺素（NA），NA硫酸盐，肾上腺素，葡萄糖，白介素6（IL-6）和中性粒细胞的运动在ALT时明显更为明显。皮质醇和人类生长激素的增加显示了ALT值升高的微不足道的趋势。血浆促红细胞生成素的升高仅在ALT后明显增加。在运动相关的游离脂肪酸，IL-8，淋巴或单核细胞计数变化方面，两种情况均未观察到差异。结论：尽管ALT和N之间的LA积累模式相匹配，但ALT时的应激反应（如交感神经激活和肝葡萄糖释放）似乎仍然更大。如果在短时间内进行重复的训练，则应考虑适度ALT对IT压力反应的这种额外影响。

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