a Centre for Human Performance , Leeds Beckett University, Institute for Sport, Physical Activity and Leisure , Leeds , UK.
b Leeds Rhinos RLFC , Leeds , UK.
Eur J Sport Sci. 2019 Feb;19(1):123-132. doi: 10.1080/17461391.2018.1527950. Epub 2018 Oct 7.
Due to the unique energetic demands of professional young collision sport athletes, accurate assessment of energy balance is required. Consequently, this is the first study to simultaneously investigate the energy intake, expenditure and balance of professional young rugby league players across a pre-season period. The total energy expenditure of six professional young male rugby league players was measured via doubly labelled water over a fourteen-day assessment period. Resting metabolic rate was measured and physical activity level calculated. Dietary intake was reported via Snap-N-Send over a non-consecutive ten-day assessment period, alongside changes in fasted body mass and hydration status. Accordingly, energy balance was inferred. The mean (standard deviation) difference between total energy intake (16.73 (1.32) MJday) and total energy expenditure (18.36 (3.05) MJday) measured over the non-consecutive ten-day period was unclear (-1.63 (1.73) MJday; ES = 0.91 ± 1.28; p = 0.221). This corresponded in a most likely trivial decrease in body mass (-0.65 (0.78) kg; ES = 0.04 ± 0.03; p = 0.097). Resting metabolic rate and physical activity level across the fourteen-day pre-season period was 11.20 (2.16) MJday and 1.7 (0.2), respectively. For the first time, this study utilises gold standard assessment techniques to elucidate the distinctly large energy expenditures of professional young rugby league players across a pre-season period, emphasising a requirement for equally large energy intakes to achieve targeted body mass and composition adaptations. Accordingly, it is imperative that practitioners regularly assess the energy balance of professional young collision-sport athletes to ensure their unique energetic requirements are achieved.
由于专业年轻碰撞运动运动员的独特能量需求，需要准确评估能量平衡。因此，这是第一项同时研究专业年轻橄榄球联盟运动员在赛季前期间能量摄入、支出和平衡的研究。通过双标记水在 14 天评估期内测量六名专业年轻男性橄榄球联盟运动员的总能量消耗。测量静息代谢率并计算体力活动水平。通过 Snap-N-Send 在非连续的 10 天评估期内报告饮食摄入情况，同时记录空腹体重和水合状态的变化。因此，推断能量平衡。在非连续的 10 天期间测量的总能量摄入（16.73（1.32）MJday）和总能量支出（18.36（3.05）MJday）之间的平均（标准偏差）差异不清楚（-1.63（1.73）MJday；ES=0.91±1.28；p=0.221）。这对应于体重的最可能微不足道的减少（-0.65（0.78）kg；ES=0.04±0.03；p=0.097）。整个 14 天赛季前期间的静息代谢率和体力活动水平分别为 11.20（2.16）MJday和 1.7（0.2）。这项研究首次利用黄金标准评估技术阐明了专业年轻橄榄球联盟运动员在赛季前期间明显较大的能量消耗，强调需要同等大的能量摄入才能实现目标体重和成分适应。因此，从业者必须定期评估专业年轻碰撞运动运动员的能量平衡，以确保满足他们独特的能量需求。
