作者: P. N. Ainslie , I. T. Campbell , K. N. Frayn , S. M. Humphreys , D. P. M. Maclaren
DOI: 10.1152/JAPPL.2002.92.1.179
关键词:
摘要: The physiological and metabolic demands of hill walking have not been studied systematically in the field despite potentially deleterious consequences activity sustained over an entire day. On separate occasions, 13 subjects completed a self-paced walk 12 km, consisting range gradients terrain typical mountainous walk. During walk, continuous measurements rectal (T(re)) skin (T(sk)) temperatures respiratory gas exchange were made to calculate total energy expenditure. Blood samples, for analysis metabolites hormones, taken before breakfast lunch immediately after first 5 km (100- 902-m elevation), T(re) increased (36.9 +/- 0.2 38.5 0.4 degrees C) with subsequent decrease mean T(sk) from this time point. decreased by approximately 1.0 C during 30-min stop lunch, it continued further 0.5 recommenced. intake both [5.6 0.7 (SE) MJ] was lower than expended [14.5 MJ; P < 0.001] 12-km Despite difference expenditure, blood glucose concentration maintained. major source enhanced fat oxidation, probably adipose tissue lipolysis reflected high plasma nonesterified fatty acid concentrations. observations varying thermoregulatory responses negative balance incurred It is concluded that recreational can constitute significant strain on participants.