Abstract:
OBJECTIVE:This study investigated the contributions of physical fitness and body composition to 24-h fat oxidation in adults under sedentary conditions in a whole-room calorimeter. METHODS:The following measurements were studied in 109 adults (49 male/45 female) at least 36 h after a bout of exercise: 1) aerobic fitness level assessed by VO2max, 2) body composition determined by underwater weighing, 3) resting metabolic rate (RMR) after an overnight fast, and 4) 24-h energy expenditure (EE) and substrate oxidation determined in a whole-room calorimeter. While in the calorimeter, subjects were provided with a diet (15% protein, 30% fat, and 55% carbohydrate) estimated to produce energy balance on a sedentary day and of similar nutritional composition to their daily dietary intake. RESULTS:We found strong negative correlations between VO2max and % body fat in both male and female subjects, but no relationship between VO2max and 24-h EE under the sedentary conditions of this study. In male subjects, VO2max (mL O2 x kg(-1) fat-free mass x min(-1)) was negatively related to fat oxidation (r = -0.397, P < 0.005), and fat oxidation was more closely related to fat mass (r = 0.434, P < 0.0002) than to fat-free mass (r = 0.165, NS). In contrast, none of these relationships were significant in females. CONCLUSION:The results show that in male subjects under sedentary conditions, 24-h fat oxidation is positively related to body fat mass and negatively related to VO2max (the marker used here for level of physical fitness). This supports our hypothesis that regularly active males maintain lower body fat stores as the low contribution to daily fat oxidation from a lower body fat mass is counterbalanced by the high contribution to fat oxidation from daily physical activity. The lack of a relationship between VO2max and 24-h EE under the sedentary conditions of this study suggests that the major effects of physical activity on total daily EE and fat oxidation may occur during and relatively quickly after an exercise bout. Further, these data also suggest that cessation of regular exercise will likely be associated with a high risk of positive fat balance and weight gain.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Kriketos AD,Sharp TA,Seagle HM,Peters JC,Hill JOdoi
10.1097/00005768-200004000-00013subject
Has Abstractpub_date
2000-04-01 00:00:00pages
805-11issue
4eissn
0195-9131issn
1530-0315journal_volume
32pub_type
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journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
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journal_title:Medicine and science in sports and exercise
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pub_type: 杂志文章,随机对照试验
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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journal_title:Medicine and science in sports and exercise
pub_type: 临床试验,杂志文章
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,随机对照试验
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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更新日期:1991-02-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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更新日期:2009-06-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,多中心研究,随机对照试验
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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更新日期:2009-05-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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更新日期:2003-03-01 00:00:00