Masashi Miyashita1, Yuka Hamada2,3, Kyoko Fujihira2,3, Chihiro Nagayama2, Masaki Takahashi4, Stephen F Burns5, Alice E Thackray6, David J Stensel6. 1. Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan. m.miyashita@waseda.jp. 2. Graduate School of Sport Sciences, Waseda University, Tokorozawa, Saitama, 359-1192, Japan. 3. Research Fellow of Japan Society for the Promotion of Science, Tokyo, 102-0083, Japan. 4. Organization for University Research Initiatives, Waseda University, Singapore, 139651, Singapore. 5. Physical Education and Sports Science Academic Group, National Institute of Education, Nanyang Technological University, Singapore, 637616, Singapore. 6. National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Abstract
PURPOSE: Dietary replacement of an acute exercise-induced energy deficit offsets the postprandial triglyceride (TG)-lowering effect of exercise in young boys and middle-aged men. It is unclear whether these findings are observed when exercise is accumulated in older adults. This study examined the effect of accumulating short bouts of exercise, with and without dietary replacement of an exercise-induced energy deficit, on postprandial TG in older women. METHODS: Seventeen older women (≥ 65 years) underwent three, 8-h trials: (1) control, (2) accumulated walking and (3) accumulated walking with energy replacement. During the control trial, participants rested for 8 h. The accumulated walking trials comprised twenty 1.5 min brisk walking bouts performed at a pre-determined self-selected pace separated by 15 min seated rest. In each trial, participants consumed a standardised breakfast and lunch. The breakfast in the accumulated walking with energy replacement trial included replacement of the energy deficit (0.62 MJ, 149 kcal) induced by exercise. Venous blood samples were collected fasted and at 2, 4, 6 and 8 h after breakfast. RESULTS: Time-averaged postprandial serum TG concentrations over 8 h were lower after accumulated walking than control and accumulated walking with energy replacement (mean ± SD: 1.46 ± 0.93 vs 1.71 ± 1.01 vs 1.60 ± 0.98 mmol/L, respectively: main effect of trial p = 0.017). There was little difference between control and accumulated walking with energy replacement. CONCLUSIONS: Replacing the energy expenditure induced by accumulating 30 min of brisk walking in short (1.5 min) bouts diminishes the postprandial TG-lowering effect in older women.
PURPOSE: Dietary replacement of an acute exercise-induced energy deficit offsets the postprandial triglyceride (TG)-lowering effect of exercise in young boys and middle-aged men. It is unclear whether these findings are observed when exercise is accumulated in older adults. This study examined the effect of accumulating short bouts of exercise, with and without dietary replacement of an exercise-induced energy deficit, on postprandial TG in older women. METHODS: Seventeen older women (≥ 65 years) underwent three, 8-h trials: (1) control, (2) accumulated walking and (3) accumulated walking with energy replacement. During the control trial, participants rested for 8 h. The accumulated walking trials comprised twenty 1.5 min brisk walking bouts performed at a pre-determined self-selected pace separated by 15 min seated rest. In each trial, participants consumed a standardised breakfast and lunch. The breakfast in the accumulated walking with energy replacement trial included replacement of the energy deficit (0.62 MJ, 149 kcal) induced by exercise. Venous blood samples were collected fasted and at 2, 4, 6 and 8 h after breakfast. RESULTS: Time-averaged postprandial serum TG concentrations over 8 h were lower after accumulated walking than control and accumulated walking with energy replacement (mean ± SD: 1.46 ± 0.93 vs 1.71 ± 1.01 vs 1.60 ± 0.98 mmol/L, respectively: main effect of trial p = 0.017). There was little difference between control and accumulated walking with energy replacement. CONCLUSIONS: Replacing the energy expenditure induced by accumulating 30 min of brisk walking in short (1.5 min) bouts diminishes the postprandial TG-lowering effect in older women.
Authors: Justin R Trombold; Kevin M Christmas; Daniel R Machin; Douglas W Van Pelt; Ting-Heng Chou; Il-Young Kim; Edward F Coyle Journal: Med Sci Sports Exerc Date: 2014-11 Impact factor: 5.411
Authors: M Miyashita; K Edamoto; T Kidokoro; T Yanaoka; K Kashiwabara; M Takahashi; S Burns Journal: Int J Sports Med Date: 2015-10-28 Impact factor: 3.118
Authors: Chihiro Nagayama; Stephen F Burns; David J Stensel; Alice E Thackray; Masaki Takahashi; Masashi Miyashita Journal: BMJ Open Sport Exerc Med Date: 2020-12-16