Document Detail

Efficiency of oxygen cost during exercise in patients with symptoms of fatigue during physical activities.
MedLine Citation:
PMID:  17718784     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: With growing age, values for oxygen uptake decrease for the same level of exercise. However, some children with normal heart and normal maximal oxygen uptake complain of exertional fatigue. AIM: To evaluate the energy expenditure during submaximal treadmill exercise. SUBJECTS AND METHODS: In 20 children with exertional fatigue (mean age at testing: 7.9 +/- 1.8 years), oxygen uptake and respiratory gas exchange were assessed breath by breath. A graded exercise test was performed until exhaustion. Patients were compared to an age- and gender-matched control group (8.4 +/- 1.9 years, p = 0.45). RESULTS: Maximal oxygen uptake in patients (48.6 +/- 7.1 mL O(2)/min/kg) was similar to normal controls (47.4 +/- 5.2 mL/min/kg, p > 0.25). The inclination of the treadmill at maximal exercise was significantly (p = 0.02) lower in patients (12.6 +/- 4.9%) versus controls (16.0 +/- 3.5%). During submaximal exercise, oxygen uptake (expressed as mL/min/kg or as a percent of maximal oxygen uptake) was significantly higher (p < 0.001) in patients compared to normal controls. CONCLUSION: Children with exertional fatigue as compared to healthy controls, have a higher oxygen uptake for the same level of exercise and therefore perform at each level of exercise closer to their maximal exercise capacity. This may in part explain subjective complaints of poor exercise tolerance.
T Reybrouck; S Vangesselen; L Mertens; M Gewillig
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta paediatrica (Oslo, Norway : 1992)     Volume:  96     ISSN:  0803-5253     ISO Abbreviation:  Acta Paediatr.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-27     Completed Date:  2007-11-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9205968     Medline TA:  Acta Paediatr     Country:  Norway    
Other Details:
Languages:  eng     Pagination:  1311-4     Citation Subset:  IM    
Department of Cardiovascular Rehabilitation, University Hospital Gasthuisberg, University of Leuven, Belgium.
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MeSH Terms
Energy Metabolism / physiology
Exercise Test
Fatigue / metabolism*,  physiopathology*
Mass Spectrometry
Motor Activity*
Oxygen / metabolism*
Oxygen Consumption / physiology*
Pulmonary Gas Exchange / physiology*
Reg. No./Substance:

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