Estudo do limiar anaeróbico ventilatório em adolescentes com peso normal e excesso de peso
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Data
2012-03-16
Autores
Gomes, Kamilla Bolonha
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Editor
Universidade Federal do Espírito Santo
Resumo
The aim of this study was to identify and compare the values of cardiorespiratory
variables at ventilatory anaerobic threshold (VAT) of adolescents of both genders
with normal weight, overweight and obesity. The participants were 311 adolescents
aged among 10 and 14 years (163 girls and 148 boys), students in the municipality of
Vitória/ES. We measured body weight and height to calculate body mass index
(BMI). From the classification by BMI, the criteria of the World Health Organization
(2007), adolescents were divided into groups: normal weight (NWG), overweight
(OWG) and obesity (OG). They underwent a resting electrocardiogram, and then
performed the cardiopulmonary exercise test on a treadmill (Inbrasport Super ATL)
using ergospirometer MedGraphics Corporation (MGC) and performing the ramp
protocol, consisting in a progressive increase speed and incline of the treadmill. The
VAT was identified by the V-slope method and/or the ventilatory equivalent of oxygen
(VE/VO
2). To assess cardiorespiratory fitness in VAT the following variables were
analyzed: oxygen consumption (VO2 L.min
-1
and ml.kg
-1
.min
-1
), carbon dioxide
production (VCO2 L.min
-1
), respiratory exchange ratio (RER), minute ventilation (VE
L.min
-1
), heart rate (HR beats.min
-1
), VE/VO
2, ventilatory equivalent for carbon
dioxide (VE/VCO2), percentage of maximal O
2 (%VO2max VAT
) and maximal HR
(%HR
max VAT
) and speed (km/h). Statistical analysis was performed one-way ANOVA
for comparisons of cardiorespiratory variables and the variable related to the
workload between the three BMI classifications and classifications of BMI in each
gender; Student's t test for comparisons between genders considering p < 0.05 for
statistical significance. The main results were: VO2 VAT (ml.kg
-1
.min
-1
) was higher for
NWG compared to OWG and OG (20.0 ±7.3; 16.5 ±5.9 and 13, 6 ±3.2, respectively),
there was no statistical difference between OWG and OG for VO2 VAT (ml.kg
-1
.min
-1
),
there was no statistical difference between groups for FC
VAT
, HRmax, %HRmax,
RTRVAT and VelVAT
; when comparing gender, the boys had the highest averages for
NWG VO2 VAT (L.min
-1
and ml.kg
-1
.min
-1
), VCO
2 VAT (L.min
-1
), RTR
VAT, VE
VAT (L.min
-1
)
and speed (km/h) than girls the same group, there was no statistical difference
between genders in OWG, except for VO2max
(higher in boys than in girls), and OG,
except for %HRmax VAT
(higher in girls than in boys). It can be concluded from this
study that overweight adolescents had impaired cardiorespiratory fitness
(submaximal level) compared to normal weight adolescents. The overweight
adolescents are similar to obese, cardiorespiratory responses in terms of the VAT,
showing that the former present a cardiorespiratory fitness as low as the last. Boys
and girls with overweight showed no differences in cardiorespiratory responses in
LAV, signaling the reduction of gender differences in this age group, usually found in
adolescents with normal weight due to the process of growth and maturational status.
Descrição
Palavras-chave
Anaerobic threshold , Adolescent , Obesity , Physical fitness , Limiar anaeróbio , Adolescentes , Obesidade , Aptidão física
Citação
GOMES, Kamila Bolonha. Estudo do limiar anaeróbico ventilatório em adolescentes com peso normal e excesso de peso. 2012. 59 f. Dissertação (Mestrado em Estudos Pedagógicos e Culturais da Educação Física) - Universidade Federal do Espírito Santo, Vitória, 2012.