Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state
BackgroundThe metabolic impact of pre-exercise feeding of protein or carbohydrate on fat oxidation and energy expenditure rates, especially, in females, is poorly understood.MethodsRecreationally active females (n = 15, 32 ± 10 years, 164.8 ± 5.6 cm, 63.5 ± 9.3 kg, 23.4 ± 3.2 kg/m2) completed four t...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Sports and Active Living |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fspor.2022.1070477/full |
| _version_ | 1797952104956952576 |
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| author | Kayla M. Ratliff Chad M. Kerksick Jessica M. Moon Anthony M. Hagele Johnathan L. Boring Kylie Walden Connor J. Gaige Richard A. Stecker Kyle L. Sunderland Petey W. Mumford |
| author_facet | Kayla M. Ratliff Chad M. Kerksick Jessica M. Moon Anthony M. Hagele Johnathan L. Boring Kylie Walden Connor J. Gaige Richard A. Stecker Kyle L. Sunderland Petey W. Mumford |
| author_sort | Kayla M. Ratliff |
| collection | DOAJ |
| description | BackgroundThe metabolic impact of pre-exercise feeding of protein or carbohydrate on fat oxidation and energy expenditure rates, especially, in females, is poorly understood.MethodsRecreationally active females (n = 15, 32 ± 10 years, 164.8 ± 5.6 cm, 63.5 ± 9.3 kg, 23.4 ± 3.2 kg/m2) completed four testing sessions in a randomized, double-blind, crossover fashion after fasting overnight. Participants ingested isovolumetric and isoenergetic solutions containing either 25 g of whey protein, casein protein, carbohydrate (CHO), or a non-caloric placebo (PLA). Participants then completed 60 min of treadmill exercise at 15% below ventilatory threshold 30 min after ingestion. Respiratory exchange ratio (RER) was evaluated throughout exercise and resting energy expenditure (REE) was assessed pre-exercise, and 0-, 60-, and 120-min post-exercise.ResultsA significant condition x time interaction was observed for RER (p = 0.008) during exercise, with CHO exhibiting higher RER values (vs. PLA) at four time points. A significant main effect for condition was observed for carbohydrate (p = 0.001) and fat (p = 0.02) oxidation rates during exercise, with fat oxidation rates being higher in PLA vs. CHO (p = 0.01). When total fat oxidized was calculated across the entire exercise bout, a significant main effect for condition was observed (p = 0.01), with PLA being greater than CHO (p = 0.04). A significant condition x time interaction (p = 0.02) was found for both absolute and normalized REE, with casein and whey protein having significantly higher values than CHO (p < 0.05) immediately post-exercise.ConclusionWhen compared to a fasted control (PLA), consuming CHO, but not protein, decreased total fat oxidation prior to a 60-min bout of moderate-intensity exercise in females. |
| first_indexed | 2024-04-10T22:42:10Z |
| format | Article |
| id | doaj.art-d50bb796afc34d3d8fe93642637fd4ee |
| institution | Directory Open Access Journal |
| issn | 2624-9367 |
| language | English |
| last_indexed | 2024-04-10T22:42:10Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Sports and Active Living |
| spelling | doaj.art-d50bb796afc34d3d8fe93642637fd4ee2023-01-16T04:55:27ZengFrontiers Media S.A.Frontiers in Sports and Active Living2624-93672023-01-01410.3389/fspor.2022.10704771070477Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted stateKayla M. RatliffChad M. KerksickJessica M. MoonAnthony M. HageleJohnathan L. BoringKylie WaldenConnor J. GaigeRichard A. SteckerKyle L. SunderlandPetey W. MumfordBackgroundThe metabolic impact of pre-exercise feeding of protein or carbohydrate on fat oxidation and energy expenditure rates, especially, in females, is poorly understood.MethodsRecreationally active females (n = 15, 32 ± 10 years, 164.8 ± 5.6 cm, 63.5 ± 9.3 kg, 23.4 ± 3.2 kg/m2) completed four testing sessions in a randomized, double-blind, crossover fashion after fasting overnight. Participants ingested isovolumetric and isoenergetic solutions containing either 25 g of whey protein, casein protein, carbohydrate (CHO), or a non-caloric placebo (PLA). Participants then completed 60 min of treadmill exercise at 15% below ventilatory threshold 30 min after ingestion. Respiratory exchange ratio (RER) was evaluated throughout exercise and resting energy expenditure (REE) was assessed pre-exercise, and 0-, 60-, and 120-min post-exercise.ResultsA significant condition x time interaction was observed for RER (p = 0.008) during exercise, with CHO exhibiting higher RER values (vs. PLA) at four time points. A significant main effect for condition was observed for carbohydrate (p = 0.001) and fat (p = 0.02) oxidation rates during exercise, with fat oxidation rates being higher in PLA vs. CHO (p = 0.01). When total fat oxidized was calculated across the entire exercise bout, a significant main effect for condition was observed (p = 0.01), with PLA being greater than CHO (p = 0.04). A significant condition x time interaction (p = 0.02) was found for both absolute and normalized REE, with casein and whey protein having significantly higher values than CHO (p < 0.05) immediately post-exercise.ConclusionWhen compared to a fasted control (PLA), consuming CHO, but not protein, decreased total fat oxidation prior to a 60-min bout of moderate-intensity exercise in females.https://www.frontiersin.org/articles/10.3389/fspor.2022.1070477/fullproteinfemalesfasted exercisenutrient timingweight lossdiet |
| spellingShingle | Kayla M. Ratliff Chad M. Kerksick Jessica M. Moon Anthony M. Hagele Johnathan L. Boring Kylie Walden Connor J. Gaige Richard A. Stecker Kyle L. Sunderland Petey W. Mumford Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state Frontiers in Sports and Active Living protein females fasted exercise nutrient timing weight loss diet |
| title | Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state |
| title_full | Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state |
| title_fullStr | Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state |
| title_full_unstemmed | Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state |
| title_short | Metabolic impact of feeding prior to a 60-min bout of moderate-intensity exercise in females in a fasted state |
| title_sort | metabolic impact of feeding prior to a 60 min bout of moderate intensity exercise in females in a fasted state |
| topic | protein females fasted exercise nutrient timing weight loss diet |
| url | https://www.frontiersin.org/articles/10.3389/fspor.2022.1070477/full |
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