Zanders BRƗ1, Harty P Ɨ1, Stecker RƗ1, Rodriguez AƗ1, Currier B*1, Smith C Ɨ1 and Kerksick CMǂ1, FACSM. 1Exercise and Performance Nutrition Laboratory, School of Health Sciences, Lindenwood University, St. Charles, MO USA

PURPOSE: To assess changes in energy expenditure across an entire NCAA division II collegiate women’s basketball season. METHODS: Female collegiate basketball players (19.8 ± 1.3 years, 173.9 ± 13.6 cm, 74.6 ± 9.1 kg, 27.1 ± 3.2 % fat, 53.9 ± 6.4 mL/kg/min, n=13) were outfitted on five different occasions throughout the entire competitive season with heart rate activity monitors for four consecutive days to determine activity energy expenditure. The five monitoring periods were broken down in phases that correlated to the time of the season. Phase I: beginning of the season, phase II: early-middle of season, phase III: mid-late, phase IV: end of the competitive season. Dietary logs, sleep, soreness and recovery surveys were completed on the days when the monitors were worn. At the beginning and end of the competitive season, resting metabolic rate assessments were completed while body composition was determined using DEXA. Data was analyzed using one-factor repeated measures ANOVA. RESULTS: Resting metabolic rate was determined to be 1,829 ± 185 kcals/day (32.7 ± 3.7 kcal/kg/day). Estimated total daily energy expenditure tended to change throughout the season (p = 0.059). Post-hoc analysis revealed that phase III, energy expenditure levels tended to be less than phase I (3,064 ± 361 vs. 2,850 ± 159, p = 0.087) and phase IV being less than phase I (2,674 ± 216, p = 0.001). Mean changes in activity energy expenditure decreased non-significantly across the season (p = 0.17). Physical activity levels (TDEE / REE) also tended to change over the season (p = 0.060). Phase III (1.62 ± 0.15, p = 0.077) tended to be less while phase IV (1.52 ± 0.17, p = 0.001) was significantly less than phase I (1.75 ± 0.27). Energy balance experienced statistically non-significant reductions (p = 0.64), with phase IV energy balance tending to be less (p = 0.074) than phase I. Energy availability (kJ/kg FFM) was calculated and did not change statistically (p = 0.81). The average number of meals (3.7 ± 0.7, p = 0.025) changed while the average hours of sleep non-significantly increased (6.5 ± 0.41, p = 0.16). CONCLUSIONS: Across the season, energy expenditure levels in NCAA division II female collegiate basketball players decreased, but this was countered with a reduction in energy intake. Consequently, energy balance levels were positive at all points, but also decreased as the season progressed as did energy availability levels. Finally, female collegiate basketball players averaged 6.5 hours of sleep and 3.7 meals per day, both representing areas of improvement from a health and recovery perspective.

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