Although a single bout of continuous exercise (≥30 min) reduces postprandial triglyceride (TG), little evidence is available regarding the effect of multiple short (≤10 min) bouts of exercise on postprandial TG in individuals at increased risk of cardiovascular diseases. This study compared the effect of different patterns of walking on postprandial TG in postmenopausal, older women with hypertriglyceridemia.
Twelve inactive women (aged 71 ± 5 yrs, mean ± S.D.) with hypertriglyceridemia (fasting TG ≥ 1.70 mmol/L) completed three, one-day laboratory-based trials in a random order: 1) control, 2) continuous walking, and 3) multiple short bouts of walking. On the control trial, participants sat in a chair for 8 hours. For the walking trials, participants walked briskly in either one 30-min bout in the morning (0900-0930) or twenty 90-sec bouts over 8 hours. Except for walking both exercise trials mimicked the control trial. In each trial, participants consumed a standardized breakfast (0800) and lunch (1100). Venous blood samples were collected in the fasted state and at 2, 4, 6 and 8 h after breakfast.
The serum TG incremental area under the curve was 35% and 33% lower on the continuous and multiple short bouts of walking trials than the control trial (8.2 ± 3.1 vs 8.5 ± 5.4 vs 12.7 ± 5.8 mmol[BULLET OPERATOR]8h/L respectively, main effect of trial: ES = 0.459, P = 0.001).
Accumulating walking in short bouts limits postprandial TG in at-risk, inactive older women with fasting hypertriglyceridemia.
Address for Correspondence: Masashi Miyashita, PhD. Waseda University, Faculty of Sport Sciences, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan, TEL/FAX: +81-4-2947-6774. E-mail: email@example.com
This study was supported by the Waseda University Grant for Special Research Projects (2016B-258, 2016-2017) and MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2015-2019 from the Ministry of Education, Culture, Sports, Science and Technology (S1511017). David Stensel acknowledges support from the National Institute for Health Research (NIHR) Leicester Biomedical Research Centre, which is a partnership between University Hospitals of Leicester NHS Trust, Loughborough University and the University of Leicester. All authors declare that there is no conflict of interest. The results of the present study do not constitute endorsement by ACSM. All authors declare that the findings of the present study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.
Accepted for Publication: 18 August 2017
© 2017 American College of Sports Medicine