期刊名称：Journal of the International Society of Sports Nutrition
电子版ISSN：1550-2783
出版年度：2014
卷号：11
期号：1
页码：12
DOI：10.1186/1550-2783-11-12
语种：English
出版社：BioMed Central
摘要：The effects of running and cycling on changes in hydration status and body composition during a 24-hour race have been described previously, but data for 24-hour ultra-mountain bikers are missing. The present study investigated changes in foot volume, body composition, and hydration status in male and female 24-hour ultra-mountain bikers. We compared in 49 (37 men and 12 women) 24-hour ultra-mountain bikers (ultra-MTBers) changes (Δ) in body mass (BM). Fat mass (FM), percent body fat (%BF) and skeletal muscle mass (SM) were estimated using anthropometric methods. Changes in total body water (TBW), extracellular fluid (ECF) and intracellular fluid (ICF) were determined using bioelectrical impedance and changes in foot volume using plethysmography. Haematocrit, plasma [Na+], plasma urea, plasma osmolality, urine urea, urine specific gravity and urine osmolality were measured in a subgroup of 25 ultra-MTBers (16 men and 9 women). In male 24-hour ultra-MTBers, BM (P 0.05). A significant correlation was found between post-race BM and post-race FM (r = 0.63, P 0.05). Absolute ranking in the race was related to Δ%BM (P 0.05). Male and female 24-hour ultra-MTBers experienced a significant loss in BM and FM, whereas SM remained stable. Body weight changes and increases in plasma urea do not reflect a change in body hydration status. No oedema of the lower limbs occurred.
关键词：Body mass ; Fat mass ; Hydration ; Foot volume
