Document Detail

The effect of advice to walk 2000 extra steps daily on food intake.
MedLine Citation:
PMID:  16911238     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: It is currently unclear how physical activity and diet interact within the ranges of activity seen in the general population. This study aimed to establish whether a small, acute, increase in physical activity would lead to compensatory change in energy intake and nutrient balance, and to provide power analysis data for future research in this field. METHOD: Twelve participants were studied over 7 days of habitual activity and 2 weeks after instruction to increase physical activity by 2000 steps per day. Physical activity was assessed using a diary, the 'activPAL' activity monitor and a pedometer. Dietary analyses from prospective food diaries were compared between the first and third weeks. RESULTS: Participants increased step-counts (+2600 steps per day, P = 0.008) and estimated energy expenditure (+300-1000 kJ day(-1), P = 0.002) but did not significantly change their energy intake, dietary composition or number of meals per day. From reverse power analysis 38 participants would be needed to exclude a change in energy intake of 400 kJ day(-1) with 90% power at P < 0.05; 400 kJ day(-1) would compensate for a 2000 steps per day increase in physical activity. CONCLUSION: These results did not demonstrate any compensatory increase in food consumption when physical activity was increased by walking an average of 2600 additional steps per day. Power analysis indicates that a larger study (n = 38) will be necessary to exclude such an effect with confidence.
A-A Koulouri; W W Tigbe; M E J Lean
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of human nutrition and dietetics : the official journal of the British Dietetic Association     Volume:  19     ISSN:  0952-3871     ISO Abbreviation:  J Hum Nutr Diet     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-08-16     Completed Date:  2006-12-05     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8904840     Medline TA:  J Hum Nutr Diet     Country:  England    
Other Details:
Languages:  eng     Pagination:  263-6     Citation Subset:  IM    
Department of Human Nutrition, Division of Developmental Medicine, University of Glasgow, Glasgow, UK.
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MeSH Terms
Energy Intake / physiology*
Evidence-Based Medicine
Exercise / physiology*
Exercise Therapy*
Health Promotion
Obesity / prevention & control,  therapy*
Statistics as Topic
Comment In:
J Hum Nutr Diet. 2006 Aug;19(4):249-51   [PMID:  16911236 ]

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