Although acute exercise affects daily energy intake, exercise has to
be sustained over time to favorweight losswhich questioned the nutritional
adaptations to long termexercise. In 2009, Caudwell and collaborators
tested the effects of a 12-week physical activity program
(approximate energy expenditure of 500 kcal per week) [4]. The authors
concluded that physical activity alone was not enough to induce
weight loss mainly because of a possible compensatory response to exercisewith
somepatients decreasing their fruit and vegetable consumption
and increasing their total energy intake [4]. This increased energy
intake with exercise could be explained by the extremely powerful appetite
system mechanisms that tend to protect individuals against
under-eating andweight loss [2]. Previously published data in obese adolescents
showed that a 6-week exercise programincreased hunger and
decreased fullness but the authors did not assess energy intake [9].
The nutritional (energy intake and appetite) adaptations to an exercise
program are of particular interest in terms of weight loss achievement,
but show an important inter-individual variability [9,10] with
some patients recruiting adaptive mechanisms to oppose the negative
or reduced energy balance induced by exercise [17]. To date no data
are available examining the possible nutritional adaptations to an exercise
program in obese youth. Accordingly, the aim of this study was to
test the impact of a 10-week aerobic program on obese adolescents' energy
intake and weight loss. Extrapolating from the literature, we hypothesize
that adolescents will not show significant changes in energy
intake or weight loss in response to the exercise intervention.
Although acute exercise affects daily energy intake, exercise has to
be sustained over time to favorweight losswhich questioned the nutritional
adaptations to long termexercise. In 2009, Caudwell and collaborators
tested the effects of a 12-week physical activity program
(approximate energy expenditure of 500 kcal per week) [4]. The authors
concluded that physical activity alone was not enough to induce
weight loss mainly because of a possible compensatory response to exercisewith
somepatients decreasing their fruit and vegetable consumption
and increasing their total energy intake [4]. This increased energy
intake with exercise could be explained by the extremely powerful appetite
system mechanisms that tend to protect individuals against
under-eating andweight loss [2]. Previously published data in obese adolescents
showed that a 6-week exercise programincreased hunger and
decreased fullness but the authors did not assess energy intake [9].
The nutritional (energy intake and appetite) adaptations to an exercise
program are of particular interest in terms of weight loss achievement,
but show an important inter-individual variability [9,10] with
some patients recruiting adaptive mechanisms to oppose the negative
or reduced energy balance induced by exercise [17]. To date no data
are available examining the possible nutritional adaptations to an exercise
program in obese youth. Accordingly, the aim of this study was to
test the impact of a 10-week aerobic program on obese adolescents' energy
intake and weight loss. Extrapolating from the literature, we hypothesize
that adolescents will not show significant changes in energy
intake or weight loss in response to the exercise intervention.
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