Energy availability describes the amount of dietary energy remaining for physiological functionality after the energy cost of exercise is deducted. The physiological and hormonal consequences of low energy availability (LEA) are well established, but the impact of LEA on physical activity behavior outside of exercise and, specifically, nonexercise activity thermogenesis (NEAT) has not been systematically examined. The authors conducted a secondary analysis of a repeated-measures crossover study in which recreationally trained young men (n = 6, 25 ± 1.0 years) underwent two 4-day conditions of LEA (15 kcal·kg fat-free mass⁻¹ ·day⁻¹) with and without endurance exercise (LEA + EX and LEA EX) and two energy-balanced control conditions (CON + EX and CON EX). The duration and intensity of physical activity outside of prescribed exercise were assessed using the SenseWear Pro3 armband. LEA did not alter NEAT (p = .41), nor time spent in moderate to vigorous (p = .20) and low-intensity physical activity (p = .17). However, time spent in low-intensity physical activity was lower in LEA + EX than LEA − EX (13.7 ± 0.3 vs. 15.2 ± 0.3 hr/day; p = .002). Short-term LEA does not seem to impact NEAT per se, but the way it is attained may impact physical activity behavior outside of exercise. As the participants expended similar amounts of energy during NEAT (900–1,300 kcal/day = 12.5–18.0 kcal·kg fat-free mass⁻¹·day⁻¹) and prescribed exercise bouts (15.0 kcal·kg fat-free mass⁻¹·day⁻¹), excluding it as a component of energy expenditure may skew the true energy available for physiological functionality in active populations.

能量可用性描述了在扣除运动的能量成本后剩余的用于生理功能的膳食能量量。低能量可用性 (LEA) 的生理和荷尔蒙后果已得到充分证实，但 LEA 对运动之外的身体活动行为的影响，特别是非运动活动产热 (NEAT) 的影响尚未得到系统检查。作者对一项重复测量交叉研究进行了二次分析，在该研究中，受过娱乐训练的年轻男性（n  = 6, 25 ± 1.0 岁）接受了两次为期 4 天的 LEA 条件（15 kcal·kg 无脂肪质量^-1 ·day ^-1) 有和没有耐力运动（LEA + EX 和 LEA EX）和两种能量平衡控制条件（CON + EX 和 CON EX）。使用 SenseWear Pro3 臂章评估规定锻炼之外的身体活动的持续时间和强度。LEA 没有改变 NEAT ( p  = .41)，也没有改变中度到剧烈 ( p  = .20) 和低强度体育活动 ( p  = .17) 的时间。然而，LEA + EX 的低强度体力活动时间低于 LEA - EX（13.7 ± 0.3 对 15.2 ± 0.3 小时/天；p = .002)。短期 LEA 似乎不会影响 NEAT 本身，但它的实现方式可能会影响运动之外的身体活动行为。由于参与者在 NEAT（900-1,300 kcal/天 = 12.5-18.0 kcal·kg 无脂肪质量^-1 · 天^-1）和规定的运动回合（15.0 kcal·kg 无脂肪质量^-1 ·day ^-1 )，将其作为能量消耗的组成部分排除在外，可能会歪曲活跃人群中可用于生理功能的真实能量。