Artikel: Effects of Exercise With and Without Energy Replacement on Substrate Utilization in the Fasting State
Journal of the American College of Nutrition. 2020 Jan. 2, v. 39, no. 1
2020
Abstract: Objective: The present study aimed to examine the interactive effect of exercise and energy balance on energy expenditure and substrate utilization. Method: Seven men and 7 women underwent three 2-day experimental protocols in a random order. Each ... ...
Abstract | Objective: The present study aimed to examine the interactive effect of exercise and energy balance on energy expenditure and substrate utilization. Method: Seven men and 7 women underwent three 2-day experimental protocols in a random order. Each protocol consisted of no exercise (NE), exercise only (EO), or exercise with a matched energy replacement (ER) on day 1 followed by metabolic testing that occurred after a 12-hour overnight fasting on day 2. Both EO and ER involved treadmill running at 60% maximal oxygen uptake (VO2max) that induced an energy expenditure of ∼ 500 kcal. The replacement meal used in ER contained ∼ 500 kcal made up of 45% carbohydrate, 30% fat, and 25% protein. During metabolic testing, oxygen uptake (VO2), heart rate (HR), respiratory exchange ratio (RER), and rates of carbohydrate (COX) and fat oxidation (FOX) were determined in three successive 15-minute periods including rest and exercise at 50% and 70% VO2max. Results: No differences in VO2 and HR were found at rest among NE, EO, and ER. However, RER was lower in EO than NE (0.840 ± 0.014 vs 0.889 ± 0.012, p < 0.05), COX (g·min−1) was lower in ER than NE (0.144 ± 0.016 vs 0.197 ± 0.019, p < 0.05), and FOX (g·min−1) was higher in EO or ER than NE (0.054 ± 0.010 or 0.057 ± 0.009 vs 0.034 ± 0.007, p < 0.05). No treatment effects were observed for all variables at either intensity. Conclusions: This study demonstrates that an exercise of moderate intensity can increase resting fat oxidation even when the exercise-induced energy expenditure is balanced by energy intake. This finding suggests that muscle action is vital in augmenting fat utilization. |
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Schlagwörter | carbohydrate content ; carbohydrates ; energy expenditure ; energy intake ; exercise ; fasting ; heart rate ; lipid content ; lipid metabolism ; men ; muscles ; oxygen ; protein content ; women |
Sprache | Englisch |
Erscheinungsverlauf | 2020-0102 |
Umfang | p. 39-46. |
Erscheinungsort | Taylor & Francis |
Dokumenttyp | Artikel |
ZDB-ID | 603204-7 |
ISSN | 1541-1087 ; 0731-5724 |
ISSN (online) | 1541-1087 |
ISSN | 0731-5724 |
DOI | 10.1080/07315724.2019.1605549 |
Datenquelle | NAL Katalog (AGRICOLA) |
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