DXA-derived estimates of energy balance and its relationship with changes in body composition across a season in team sport athletes

IF 2.4 3区医学 Q2 SPORT SCIENCES

European Journal of Sport Science Pub Date : 2020-08-01 DOI:10.1080/17461391.2019.1669718

J. Bartlett, Malcolm Hatfield, Ben B Parker, L. Roberts, C. Minahan, J. Morton, H. Thornton

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引用次数: 15

Abstract

Abstract This study examined the relationship between dual-energy x-ray absorptiometry (DXA)-derived estimates of energy balance (EB) and changes in body composition across various seasonal phases in team sport athletes. Forty-five Australian rules footballers underwent six DXA scans across a 12-month period (off-season [OS, Week 0–13], early [PS1, Week 13–22] and late pre-season [PS2, Week 22–31] and early [IS1, Week 3–42] and late in-season [IS2, Week 42–51]). EB (kcal·day−1) was estimated from changes in fat free soft tissue mass (FFSTM) and fat mass (FM) between scans according to a validated formula. An EB threshold of ± 123 kcal·day−1 for >60 days demonstrated a very likely (>95% probability) change in FFSTM (>1.0 kg) and FM (>0.7 kg). There were small to almost perfect relationships between EB and changes in FM (r = 0.97, 95% CI, 0.96–0.98), FFSTM (r = −0.41, −0.92 to −0.52) and body mass (r = 0.27, 0.14–0.40). EB was lowest during PS1 compared to all other phases (range, −265 to −142 kcal·day−1), with no other changes at any time. Increases in FFSTM were higher during OS compared to PS2 (1.6 ± 0.4 kg), and higher during PS1 compared to PS2, IS1, and IS2 (range, 1.6–2.1 kg). There were no changes during in-season (−0.1–0.05 kg). FM decreased only in PS1 compared to all other seasonal phases (−1.8 to −1.0 kg). Assessments of body composition can be used as a tool to estimate EB, which practically can be used to indicate athlete’s training and nutrition behaviours/practices.

查看原文本刊更多论文

dxa衍生的能量平衡估算及其与团队运动运动员整个赛季身体成分变化的关系

摘要:本研究探讨了双能x线吸收仪(DXA)衍生的能量平衡(EB)估计值与团队运动运动员不同季节身体成分变化之间的关系。45名澳式足球运动员在12个月的时间里接受了6次DXA扫描(休赛期[OS, 0-13周]，早期[PS1, 13-22周]和季前赛后期[PS2, 22-31周]和早期[IS1, 3-42周]和赛季后期[IS2, 42-51周])。EB (kcal·day−1)是根据扫描之间无脂肪软组织质量(FFSTM)和脂肪质量(FM)的变化，根据一个经过验证的公式估计出来的。EB阈值为±123 kcal·day−1，持续>60天，表明FFSTM (>1.0 kg)和FM (>0.7 kg)极有可能(>95%概率)发生变化。EB与FM (r = 0.97, 95% CI, 0.96-0.98)、FFSTM (r = - 0.41， - 0.92至- 0.52)和体重(r = 0.27, 0.14-0.40)的变化呈小到近乎完美的关系。与其他所有阶段相比，PS1期间EB最低(范围为- 265至- 142 kcal·day - 1)，其他任何时间均无变化。FFSTM在OS期间的增加高于PS2(1.6±0.4 kg)， PS1期间的增加高于PS2、IS1和IS2(范围1.6 - 2.1 kg)。季节间无变化(−0.1 ~ 0.05 kg)。与所有其他季节相相比，FM仅在PS1阶段下降(−1.8至−1.0 kg)。体成分的评估可以作为评估EB的工具，它实际上可以用来指示运动员的训练和营养行为/实践。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Sport Science 医学-运动科学

CiteScore

6.60

自引率

3.10%

发文量

153

审稿时长

6-12 weeks

期刊介绍： The European Journal of Sport Science (EJSS) is the official Medline- and Thomson Reuters-listed journal of the European College of Sport Science. The editorial policy of the Journal pursues the multi-disciplinary aims of the College: to promote the highest standards of scientific study and scholarship in respect of the following fields: (a) Applied Sport Sciences; (b) Biomechanics and Motor Control; c) Physiology and Nutrition; (d) Psychology, Social Sciences and Humanities and (e) Sports and Exercise Medicine and Health.