Weight loss associated with exercise training restores ventilatory efficiency in obese children
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/10/2012
18/10/2012
2009
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Resumo |
The purpose of this study was to test the hypothesis that in obese children: 1) Ventilatory efficiency (VentE) is decreased during graded exercise; and 2) Weight loss through diet alone (D) improves VentE, and 3) diet associated with exercise training (DET) leads to greater improvement in VentE than by D. Thirty-eight obese children (10 +/- 0.2 years; BMI > 95(th) percentile) were randomly divided into two Study groups: D (n=17; BMI = 30 +/- 1 kg/m(2)) and DET (n = 21; 28 +/- 1 kg/m(2)). Ten lean children were included in a control group (10 +/- 0.3 years; 17 +/- 0.5 kg/m(2)). All children performed maximal treadmill testing with respiratory gas analysis (breath-by-breath) to determine the ventilatory anaerobic threshold (VAT) and peak oxygen consumption (VO(2) peak). VentE was determined by the VE/VCO(2) method at VAT. Obese children showed lower VO(2) peak and lower VentE than controls (p < 0.05). After interventions, all obese children reduced body weight (p < 0.05). D group did not improve in terms of VO(2) peak or VentE (p > 0.05). In contrast, the DET group showed increased VO(2) peak (p = 0.01) and improved VentE(Delta VE/VCO(2) = -6.1 +/- 0.9; p = 0.01). VentE is decreased in obese children, where weight loss by means of DET, but not D alone, improves VentE and cardiorespiratory fitness during graded exercise. |
Identificador |
INTERNATIONAL JOURNAL OF SPORTS MEDICINE, v.30, n.11, p.821-826, 2009 0172-4622 http://producao.usp.br/handle/BDPI/17330 10.1055/s-0029-1233486 |
Idioma(s) |
eng |
Publicador |
GEORG THIEME VERLAG KG |
Relação |
International Journal of Sports Medicine |
Direitos |
restrictedAccess Copyright GEORG THIEME VERLAG KG |
Palavras-Chave | #childhood obesity #physical activity #ventilatory response #cardiorespiratory fitness #ANAEROBIC THRESHOLD #OVERWEIGHT CHILDREN #ADOLESCENT FEMALES #AEROBIC FITNESS #CYCLE EXERCISE #BLOOD-PRESSURE #PERFORMANCE #RESPONSES #GROWTH #SHUNT #Sport Sciences |
Tipo |
article original article publishedVersion |