Produção Nacional
Revisado por pares
Is The Acsm Recommendations For Exercise Prescription For Obese Adolescents In Accordance With Ventilatory Threshold?
2017; Lippincott Williams & Wilkins; Volume: 49; Issue: 5S Linguagem: Inglês
10.1249/01.mss.0000518949.50262.dc
ISSN1530-0315
AutoresWagner Luiz do Prado, Mara Cristina Lofrano-Prado, Daniel Calado, Antônio Henrique Germano-Soares, James O. Hill, João Paulo Botero, Raphael Mendes Ritti‐Dias,
Tópico(s)Health and Lifestyle Studies
ResumoPURPOSE: To compare heart rate (HR) and oxygen uptake (V[Combining Dot Above]O2) among ACSM recommended intensities for obese adolescents (70% of maximum heart rate - HRmax, 60% of maximum oxygen uptake - V[Combining Dot Above]O2max) and ventilatory threshold 1 (VT1). METHODS: One-hundred and twenty-seven obese adolescents (age=15.2±1.5yrs.; BMI=34.6±3.9 kg/m2; Fat mass=48.8±5.3%) performed an incremental treadmill test. The initial load was set at 3 km/h (3 minutes) and increased 1km/h each minute until exhaustion, while the grade was kept constant at 1%. V[Combining Dot Above]O2 was measured directly in an open circuit respiratory metabolic system (Quark, PFT, Cosmed, Italy). VT1 was determined by visual inspection using Wasserman’s criteria by two independent researchers. ANCOVA adjusted for gender, age and fat percentage was used to compare HR and V[Combining Dot Above]O2 among the three intensities (70%HRmax, 60%V[Combining Dot Above]O2max and VT1), with Tukey test for post-hoc comparisons. RESULTS: VT1 was achieved at 67 ± 9% of V[Combining Dot Above]O2 max (ranging from 45 to 93%). HR at VT1 was higher than HR at 60% V[Combining Dot Above]O2max and 70%HRmax (p<0.05). HR at 60%VO2max was higher than at 70%HRmax (p<0.05%). V[Combining Dot Above]O2 was also higher at VT1 compared to 70%HRmax (p<0.05), with no differences in further comparisons (p<0.05) (Figure 1). CONCLUSION: In obese adolescents, an aerobic exercise prescription based on ACSM recommendations requires lower cardiorespiratory effort than VT1 intensity. The exercise prescription at 60%V[Combining Dot Above]O2max induces higher cardiorespiratory stimulus than at 70%HRmax. Supported by CNPq (grant 477955/2009-6) and FACEPE (grant 0928-4.9/08) Figure 1. Heart rate and oxygen uptake responses at different recommendations for aerobic exercise prescription for obese adolescents
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