Estimation de la consommation pic d’oxygène par la perception de l’effort chez des patients obèses et diabétiques de type 2

Abstract

ObjectivesThe main objectives of this study were: 1) to assess the validity of predicting peak oxygen uptake (.VO2peak) from ratings of perceived exertion (RPE) during a sub-maximal graded exercise test (GXT), in obese patients with diabetes, and 2) to compare the accuracy of predictions obtained from RPE ≤ 15 and RPE ≤ 17. Materials and methods: Seventeen obese women with type 2 diabetes performed GXT to volitional exhaustion, in which oxygen uptake (.VO2) and RPE were measured. Individual linear regressions between.VO2 and RPE, that were collected during the first stages of GXT (RPE ≤ 15 and RPE ≤ 17), were extrapolated to RPE = 20 in order to predict.VO2peak. Results: Actual (12.7 ± 3.6 ml.min−1.kg−1) and predicted.VO2peak from RPE ≤ 15 and RPE ≤ 17 (13.1 ± 3.7 and 13.3 ± 3.8 ml.min−1.kg−1, respectively) were not significantly different. The actual.V O2peak were significantly correlated to the predicted.VO2peak from RPE ≤ 15 and RPE ≤ 17 (R = 0.89 and R = 0.92, respectively). The 95% limits of agreement analysis were −0.4 ± 3.4 and −0.6 ± 3.0 ml.min−1.kg−1 for the predictions from RPE ≤ 15 and RPE ≤ 17, respectively.ConclusionResults suggested that the RPE ≤ 15 provide accurate.V O2peak prediction in obese women with type 2 diabetes. However, the accurate of predictions was improved when the.VO2peak was predicted from RPE ≤ 17. Consequently, RPE may be used to predict.VO2peak and to decrease the risk of cardio-vascular complications during GXT.