Reduced fat oxidation rates during submaximal exercise in adolescents with Crohn's disease.

Abstract:

BACKGROUND:Children with Crohn's disease (CD) suffer from malnutrition. Understanding substrate utilization during exercise may help patients with CD sustain a healthy active lifestyle without compromising nutrition. The aim of this study was to determine whether substrate utilization and bioavailability during exercise are altered in children with CD compared with controls. METHODS:Seven children with CD (mean age ± SD: 15.2 ± 2.3 yr) and 7 controls (14.4 ± 2.3 yr) were matched by sex and biological age. Participants completed 60 minutes of cycling at an intensity equivalent to 50% of their peak mechanical power. Rates of total fat and carbohydrate (CHO) oxidation, the amount of fat and CHO oxidized, and the contribution of fat and CHO to total energy expenditure were calculated from expired gases collected during exercise. Blood was collected before, during, and at the end of exercise and analyzed for insulin, free fatty acids, and glucose. RESULTS:Whole-body fat oxidation rate (expressed in mg · kg(-1) of body weight per min) during exercise was lower in children with CD (5.8 ± 1.0) compared with controls (8.0 ± 2.2, P < 0.05). Children with CD relied significantly more on CHO, with approximately 10% greater contribution toward total energy expenditure (P < 0.05) than controls. There were no differences in plasma insulin, free fatty acids, or glucose between the groups. CONCLUSIONS:Fat metabolism during exercise seems to be impaired in children with CD. A greater reliance on CHO is required to meet the energy demands of submaximal exercise.

journal_name

Inflamm Bowel Dis

authors

Nguyen T,Ploeger HE,Obeid J,Issenman RM,Baker JM,Takken T,Parise G,Timmons BW

doi

10.1097/01.MIB.0000436958.54663.4f

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

2659-65

issue

12

eissn

1078-0998

issn

1536-4844

journal_volume

19

pub_type

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