Abstract
The main objective of the present study was to determine whether a structured, laboratory-based exercise task would modify the energy expenditure (EE) and the pattern of spontaneous physical activity (PA) of obese boys on the day of an exercise laboratory visit and on the following day. Fourteen 10- to 15-y-old moderately obese (36.6 ± 3.3% fat) boys volunteered. They each had three laboratory visits, 1 wk apart. In one visit, they performed a strenuous 50-min cycling task; in another, a 30-min medium-intensity cycling task; and in another (which served as placebo), they did not exercise. PA was monitored the day before (d 1), during (d 2), and after (d 3) each laboratory visit by use of a heart rate monitor and a 12-h recall interview. EE was calculated from minute-by-minute heart rate and each child's predetermined relationship between oxygen uptake and heart rate. EE and PA were analyzed from 1300 to 1900 h each day using 15-min intervals. EE tended to decrease (p < 0.087) in the afternoon of all d 2 compared with d 1, and it increased on d 3 after the medium-intensity exercise (p < 0.0005). EE during d 2 and 3 combined, compared with d 1, decreased after the high-intensity exercise (534.2 versus 564.3 kJ/h, p < 0.05). It increased after the medium-intensity exercise (561.8 versus 526.7 kJ/h, p = 0.052) and was not affected after the placebo visit (589.4 versus 574.3 kJ/h). Time spent outdoors was consistently reduced on the day of laboratory visit compared with the day before and after the visit, regardless of the contents of intervention In conclusion, a single laboratory visit is followed by a reduction in EE and PA on the day of intervention. However, its effect on EE the following day may be dose dependent: medium-intensity exercise induces an increase in EE, but high-intensity exercise causes a decrease in EE. One implication is that intervention by physical training should employ medium-intensity exercise to enhance the EE of obese boys.
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Abbreviations
- bpm:
-
heart beats per minute
- EE:
-
energy expenditure
- HR:
-
heart rate
- OUT:
-
time spent outdoors
- PA:
-
physical activity
- V˙:
-
oxygen uptake
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Acknowledgements
The authors thank Eric Duku, Mike Riddell, and Randy Calvert for their valuable comments and suggestions.
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Supported by a grant from the Canadian Fitness and Lifestyle Research Institute.urrent address [S.K.]: Klinik für Kinder & Jugendliche, Stadtspital Triemli, Zürich, Switzerland.urrent address [H.H.]: Univ.-Kinderklinik, 97080 Würzburg, Germany.
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Kriemler, S., Hebestreit, H., Mikami, S. et al. Impact of a Single Exercise Bout on Energy Expenditure and Spontaneous Physical Activity of Obese Boys. Pediatr Res 46, 40–44 (1999). https://doi.org/10.1203/00006450-199907000-00007
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DOI: https://doi.org/10.1203/00006450-199907000-00007
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