Quantitative Model of Sustained Physical Task Duration at Varying Altitudes

Medicine and Science in Sports and Exercise
Beth A BeidlemanS R Muza

Abstract

The objective of this study is to develop a quantitative model that can be used before ascent to altitude (ALT) to predict how much longer a sustained physical task would take for unacclimatized individuals in the early hours of exposure. Using multiple linear regression, we analyzed time-trial (TT) performance on 95 unacclimatized men (n = 83) and women (n = 12) at sea level (SL) and at an ALT ranging from 2500 to 4300 m. The TT was initiated within 4 h of ascent to ALT. The independent variables known before ascent were as follows: ALT, age, height, weight, sex, SL peak oxygen uptake, SL task duration time, and body mass index (BMI) classification (normal weight vs overweight). The dependent variable was the percent increase in TT duration from SL to ALT. The most significant factor in the model was ALT (P = 0.0001), followed by BMI classification (P = 0.0009) and the interaction between BMI classification and ALT (P = 0.003). The model is as follows: percent increase in TT duration = [100 + e(-1.517+1.323 (ALT)+3.124 (BMI class)-0.769 (ALT) (BMI class)]. The percent increase in TT duration in overweight individuals was 129% greater than for normal-weight individuals at 3000 m. However, as ALT increased beyond 3000 m, the dis...Continue Reading

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Citations

Apr 30, 2014·Extreme Physiology & Medicine·Beth A BeidlemanStephen R Muza
Nov 16, 2018·Medicine and Science in Sports and Exercise·Robert W KenefickCharles S Fulco
Jul 31, 2020·Journal of Applied Physiology·Roy M SalgadoRobert W Kenefick
Jan 1, 2017·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Beth A BeidlemanMichael N Sawka

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