Abstract
We compared the effects of prolonged sitting with the effects of sitting interrupted
by regular walking and the effects of prolonged sitting after continuous walking on
postprandial triglyceride in postmenopausal women. 15 participants completed 3 trials
in random order: 1) prolonged sitting, 2) regular walking, and 3) prolonged sitting
preceded by continuous walking. During the sitting trial, participants rested for
8 h. For the walking trials, participants walked briskly in either twenty 90-sec bouts
over 8 h or one 30-min bout in the morning (09:00–09:30). Except for walking, both
exercise trials mimicked the sitting trial. In each trial, participants consumed a
breakfast (08:00) and lunch (11:00). Blood samples were collected in the fasted state
and at 2, 4, 6 and 8 h after breakfast. The serum triglyceride incremental area under
the curve was 15 and 14% lower after regular walking compared with prolonged sitting
and prolonged sitting after continuous walking (4.73±2.50 vs. 5.52±2.95 vs. 5.50±2.59 mmol/L∙8 h
respectively, main effect of trial: P=0.023). Regularly interrupting sitting time with brief bouts of physical activity
can reduce postprandial triglyceride in postmenopausal women.
Key words
postprandial period - sedentary lifestyle - short bouts of walking
