Exercise-induced energy expenditure: implications for exercise prescription and obesity.
OBJECTIVE
Walking is commonly recommended to help with weight management. We measured total energy expenditure (TEE) and its components to quantify the impact of increasing exercise-induced energy expenditure (ExEE) on other components of TEE.


METHODS
Thirteen obese women underwent an 8-week walking group intervention. TEE was quantified using doubly labeled water, ExEE was quantified using heart rate monitors, daily movement was assessed by accelerometry and resting metabolic rate was measured using indirect calorimetry.


RESULTS
Four of the 13 participants achieved the target of 1500kcalwk(-1) of ExEE and all achieved 1000kcalwk(-1). The average ExEE achieved by the group across the 8 weeks was 1434+/-237kcalwk(-1). Vigorous physical activity, as assessed by accelerometry, increased during the intervention by an average of 30min per day. Non-exercise activity thermogenesis (NEAT) decreased, on average, by 175kcald(-1) (-22%) from baseline to the intervention and baseline fitness was correlated with change in NEAT.


CONCLUSIONS
Potential alterations in non-exercise activity should be considered when exercise is prescribed. The provision of appropriate education on how to self-monitor daily activity levels may improve intervention outcomes in groups who are new to exercise.


CONCLUSIONS
Strategies to sustain incidental and light physical activity should be offered to help empower individuals as they develop and maintain healthy and long-lasting lifestyle habits.
Colley
Rachel C
RC
Children's Hospital of Eastern Ontario Research Institute, Ottawa, Canada. rcolley@cheo.on.ca
Hills
Andrew P
AP
King
Neil A
NA
Byrne
Nuala M
NM
D000054:Acceleration; D000328:Adult; D000704:Analysis of Variance; D001481:Basal Metabolism; D037001:Directive Counseling / Q000379:methods*; D004734:Energy Metabolism; D015444:Exercise; D005260:Female; D015438:Health Behavior; D006266:Health Education; D006339:Heart Rate; D006801:Humans; D009043:Motor Activity; D009765:Obesity / Q000517:prevention & control*; D010349:Patient Compliance; D010353:Patient Education as Topic / Q000379:methods*; D016730:Program Development; D015397:Program Evaluation; D011446:Prospective Studies; D013223:Statistics as Topic; D022722:Thermogenesis