Walking and Running Economy: Inverse Association with Peak Oxygen Uptake

• Autores: Brandon J. Sawyer, Jason R. Blessinger, Brian Irving, Arthur L. Weltman, James T. Patrie, Glenn A. Gaesser
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 42, Nº. 11, 2010, págs. 2122-2127
• Idioma: inglés
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• Dialnet Métricas: 3 Citas
• Resumen

  • Purpose: The purpose of this study was to test the hypothesis that V?O is positively correlated with the regression coefficients of the curve-linear relationship between V?O and speed during a protocol consisting of submaximal walking and running.

    Methods: Nineteen healthy men (mean ± SD: age = 26.4 ± 6.4 yr, height = 179.9 ± 7.2 cm, weight = 77.7 ± 8.7 kg, % fat = 16.3 ± 7.3) and 21 healthy women (age = 25.6 ± 4.9 yr, height = 167.2 ± 5.4 cm, weight = 61.6 ± 7.7 kg, % fat = 24.0 ± 6.8) underwent an incremental treadmill test to determine V?O and on two separate days performed an exercise protocol consisting of treadmill walking on a level grade at 2.0 mph (54 m·min ), 3.0 mph (80 m·min ), and 4.0 mph (107 m·min ) and running at 6.0 mph (161 m·min ). Subjects exercised for 5 min at each velocity, with 3 min of rest in between each exercise bout. Pulmonary ventilation ( ) and gas exchange were measured breath-by-breath each minute. The average of V?O values obtained during the last 2 min of exercise for both exercise sessions was used in polynomial random coefficient regression analysis.

    Results: In the polynomial random coefficient regression analysis for walking speeds only, both linear ( = 0.31, = 0.053) and quadratic ( = 0.35, = 0.029) coefficients were modestly correlated with V?O . Steady-state V?O during walking at 3.0 and 4.0 mph and running at 6.0 mph was also modestly correlated with V?O ( = 0.30-0.48).

    Conclusions: The results confirm our hypothesis and suggest that, as walking speed increases, the increase in V?O is positively correlated with the V?O . Our findings are consistent with the notion that cardiorespiratory fitness and exercise economy are inversely related.