Open AccessPrediction equation to estimate heart rate at individual ventilatory threshold in female and male obese adults
Author(s) -
Gian Pietro Emerenziani,
Dafne Ferrari,
Maria Grazia Vaccaro,
Maria Chiara Gallotta,
Silvia Migliaccio,
Andrea Lenzi,
Carlo Baldari,
Laura Guidetti
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0197255
Subject(s) - anthropometry , medicine , heart rate , cardiopulmonary exercise test , obesity , regression analysis , intensity (physics) , linear regression , body mass index , physical therapy , cardiology , blood pressure , vo2 max , statistics , mathematics , physics , quantum mechanics
Objective Prescribing individualized moderate exercise intensity is a useful method to reach positive effects on health status in obese adults. This study aimed to establish a practical reference equation to estimate the heart rate (HR) at individual ventilatory threshold (IVT) (HR IVT ). Methods One hundred sixty-one obese subjects were clinically evaluated and characterized by anthropometric and body composition. Participants performed the six-minute walking test (6-MWT) and the cardiopulmonary exercise test to assess IVT. Multiple regression analysis for HR IVT , including 6-MWT, anthropometric, and body composition parameters, as independent variables, was performed for both gender separately. A cross-validation study was also performed to determine the accuracy of the prediction equation. Results Whereas HR IVT was not significantly different between males (121.5±18.3 bpm) and females (117.6±17.1 bpm), it differently correlated with physical and performance parameters. Therefore, two sex-specific equations were developed including 6-MWT HR and HR rest (R 2 = 0.69 and 0.65 and root mean square errors of 8.8 and 10.1 bpm for females and males, respectively). Conclusion In conclusion, in female and male obese adults, the 6-MWT might be used to predict HR at IVT. These outcomes are useful to prescribe optimal physical activity intensity when gold standard methods (e.g. gas exchange analysis) are unavailable.