Different patterns of brisk walking are equally effective in decreasing postprandial lipaemia

Abstract

OBJECTIVE: To compare the effects of different patterns of brisk walking on day-long plasma triacylglycerol concentrations in sedentary adults. DESIGN: A three-trial, repeated measures design in which subjects were studied in the fasted state and throughout a day during which they consumed three standardized, mixed meals. On different occasions, subjects undertook no exercise (control), walked briskly for 10 min before each meal (short walks) or walked briskly for 30 min before breakfast (long walk). SUBJECTS: Seven postmenopausal sedentary women and three sedentary men aged between 34 and 66 y, with body mass index between 24 and 35 kgam 2 . MEASUREMENTS: Plasma concentrations of triacylglycerol, non-esteri®ed fatty acids, glucose and insulin, metabolic rate and whole-body substrate oxidation in the fasted state and at hourly intervals for 3 h after each meal. RESULTS: Postprandial plasma triacylglycerol concentrations were lower (P 0.009) during the walking trials than during the control trial (average values: control 2.08 AE 0.28 mmolal; short walks 1.83 AE 0.22 mmolal; long walk 1.84 AE 0.22 mmolal (mean AE s.e.) but did not differ between the two patterns of walking. The difference between control and walking trials increased as successive meals were consumed (interaction of trialÂmeal P 0.03). Plasma triacylglycerol concentration increased during the 3 h after breakfast, changed little after lunch and decreased after the evening meal (interaction of mealÂtime P 0.001). When both walking trials were treated as one condition, walking increased postprandial fat oxidation (average values: control, 0.066 AE 0.009 gamin; walking 0.074 AE 0.008 gamin; P`0.01). CONCLUSIONS: Thirty minutes of brisk walking, undertaken in one session or accumulated throughout a day, reduces postprandial plasma triacylglycerol concentrations and increases fat oxidation.

Effects of continuous versus accumulated activity patterns on postprandial triacylglycerol concentrations in obese men

“…5 Previous studies have compared the effects of accumulated/intermittent exercise (bouts lasting 10-30 min each bout) with an equivalent volume of one continuous exercise on postprandial TAG concentrations. 7,9,10 The reduction in postprandial TAG concentrations with both patterns of exercise demonstrated in the present study is consistent with the findings of previous studies employing young, active individuals 9 and middle-age, sedentary individuals. 10 To our knowledge, the present study is the first to examine Accumulating exercise and postprandial lipaemia M Miyashita the effects of accumulating short (3 min) bouts of activity on postprandial lipaemia in obese men.…”

“…7,9,10 The reduction in postprandial TAG concentrations with both patterns of exercise demonstrated in the present study is consistent with the findings of previous studies employing young, active individuals 9 and middle-age, sedentary individuals. 10 To our knowledge, the present study is the first to examine Accumulating exercise and postprandial lipaemia M Miyashita the effects of accumulating short (3 min) bouts of activity on postprandial lipaemia in obese men. Data from the present study extend the findings of the previous study 11 by demonstrating that the recommended volume of activity (0.84 MJ ¼ 200 kcal) accumulated through multiple short bouts of moderate intensity activity is as effective in lowering postprandial TAG concentrations as 30 min of an equivalent volume of activity performed in one continuous bout in inactive obese men.…”

“…Thus, the findings may not be applicable to the public at large. Nonetheless, one study which supports the notion that the findings of the present study are applicable to the general public is that of Murphy et al 10 Their study demonstrated that 30 min of brisk walking equivalent to 60% of maximum oxygen uptake accumulated throughout the day (10 min  3) or in one continuous session (30 min), performed by sedentary middle-aged individuals reduces postprandial plasma TAG concentrations measured over a 12-h period compared with a control trial. The reduction of postprandial TAG concentrations was comparable in both exercise trials as is the case in the present study.…”

“…5 The effectiveness of accumulating short bout of exercise to reduce postprandial lipaemia (it is considered an emerging risk factor for cardiovascular disease 6 (CVD)) has been examined in previous studies. [7][8][9][10][11][12] Four studies have reported that the reduction in postprandial triacylglycerol (TAG) concentrations was comparable for accumulated (bouts lasting 3-30 min each bout) versus an equivalent volume of continuous activity [9][10][11] or even greater with accumulated (bouts lasting 10 min each bout) versus an equivalent volume of continuous exercise. 7 Although all four studies have provided support for the concept of accumulation, the acute effects of accumulating exercise in bouts shorter than 10 min per session throughout the day on postprandial TAG concentrations in obese individuals has not been determined.…”

“…7 Although all four studies have provided support for the concept of accumulation, the acute effects of accumulating exercise in bouts shorter than 10 min per session throughout the day on postprandial TAG concentrations in obese individuals has not been determined. It is important to address this issue as the subjects in previous studies, 7,9,11 with exception of one study, 10 were healthy individuals. Thus, the findings needs to be generalized, to less active, overweight/obese individuals at more risk of CVD because perturbations in TAG concentrations following meals are more likely to be exaggerated in such individuals compared with their healthy peers.…”