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Different Patterns of Walking and Postprandial Triglycerides in Older Women

KASHIWABARA, KYOKO1; KIDOKORO, TETSUHIRO2; YANAOKA, TAKUMA1,3; BURNS, STEPHEN F.4; STENSEL, DAVID J.5; MIYASHITA, MASASHI6

Medicine & Science in Sports & Exercise: January 2018 - Volume 50 - Issue 1 - p 79–87
doi: 10.1249/MSS.0000000000001413
Applied Sciences

Purpose 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 for cardiovascular diseases. This study compared the effects of different patterns of walking on postprandial TG in postmenopausal, older women with hypertriglyceridemia.

Methods Twelve inactive women (mean age ± SD, 71 ± 5 yr) with hypertriglyceridemia (fasting TG ≥1.70 mmol·L−1) completed three, 1-d 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 h. For the walking trials, participants walked briskly in either one 30-min bout in the morning (0900–0930 h) or twenty 90-s bouts over 8 h. Except for walking, both exercise trials mimicked the control trial. In each trial, participants consumed a standardized breakfast (0800 h) and lunch (1100 h). Venous blood samples were collected in the fasted state and at 2, 4, 6, and 8 h after breakfast.

Results The serum TG incremental area under the curve was 35% and 33% lower on the continuous and multiple short bouts of walking trials than that on the control trial (8.2 ± 3.1 vs 8.5 ± 5.4 vs 12.7 ± 5.8 mmol per 8 h·L−1, respectively; main effect of trial: effect size = 0.459, P = 0.001).

Conclusions Accumulating walking in short bouts limits postprandial TG in at-risk, inactive older women with fasting hypertriglyceridemia.

1Graduate School of Sport Sciences, Waseda University, Saitama, JAPAN; 2Institute of Health and Sports Science and Medicine, Juntendo University, Chiba, JAPAN; 3Research Fellow of Japan Society for the Promotion of Science, Tokyo, JAPAN; 4Physical Education and Sports Science Academic Group, Nanyang Technological University, SINGAPORE; 5National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UNITED KINGDOM; and 6Faculty of Sport Sciences, Waseda University, Saitama, JAPAN

Address for correspondence: Masashi Miyashita, Ph.D., Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan; E-mail: m.miyashita@waseda.jp.

Submitted for publication March 2017.

Accepted for publication August 2017.

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© 2018 American College of Sports Medicine