Military training is characterized by high daily energy expenditures which are difficult to match with energy intake, potentially resulting in negative energy balance (EB) and low energy availability (EA). The aim of this study was to quantify EB and EA during British Army Officer Cadet training. Thirteen (seven women) Officer Cadets (mean ± SD: age 24 ± 3 years) volunteered to participate. EB and EA were estimated from energy intake (weighing of food and food diaries) and energy expenditure (doubly labeled water) measured in three periods of training: 9 days on-camp (CAMP), a 5-day field exercise (FEX), and a 9-day mixture of both CAMP and field-based training (MIX). Variables were compared by condition and gender with a repeated-measures analysis of variance. Negative EB was greatest during FEX (−2,197 ± 455 kcal/day) compared with CAMP (−692 ± 506 kcal/day; p < .001) and MIX (−1,280 ± 309 kcal/day; p < .001). EA was greatest in CAMP (23 ± 10 kcal·kg free-fat mass [FFM]⁻¹·day⁻¹) compared with FEX (1 ± 16 kcal·kg FFM⁻¹·day⁻¹; p = .002) and MIX (10 ± 7 kcal·kg FFM⁻¹·day⁻¹; p = .003), with no apparent difference between FEX and MIX (p = .071). Irrespective of condition, there were no apparent differences between gender in EB (p = .375) or EA (p = .385). These data can be used to inform evidenced-based strategies to manage EA and EB during military training, and enhance the health and performance of military personnel.

军事训练的特点是每日能量消耗高，难以与能量摄入相匹配，可能导致负能量平衡（EB）和低能量可用性（EA）。本研究的目的是量化英国陆军军官学员培训期间的 EB 和 EA。十三名（七名女性）军官学员（平均 ± SD：年龄 24 ± 3 岁）自愿参加。EB 和 EA 是根据在三个训练期间测量的能量摄入（食物和食物日记的称重）和能量消耗（双重标记的水）来估计的：9 天的营地 (CAMP)、5 天的野外锻炼 (FEX)、以及为期 9 天的 CAMP 和实地培训 (MIX) 混合。变量通过条件和性别与重复测量方差分析进行比较。负 EB 在 FEX 期间最大（-2，p  < .001）和 MIX（-1,280 ± 309 kcal/天；p  < .001）。与 FEX (1 ± 16 kcal·kg FFM ^-1 ·day ^-1 ; p  = .002)相比，CAMP (23 ± 10 kcal·kg 游离脂肪质量 [FFM] ^-1 ·day ^-1 )的 EA 最高，并且MIX (10 ± 7 kcal·kg FFM ^-1 ·day ^-1 ; p  = .003)，FEX 和 MIX 之间没有明显差异 ( p  = .071)。无论条件如何，EB ( p  = .375) 或 EA ( p = .385)。这些数据可用于为军事训练期间管理 EA 和 EB 的循证策略提供信息，并提高军事人员的健康和绩效。