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Obese Patients Decrease Work Rate in Order to Keep a Constant Target Heart Rate.

Lucrezia Zuccarelli1, Alessandro Sartorio, Roberta DE Micheli2

  • 1Department of Medicine, University of Udine, Udine, ITALY.

Medicine and Science in Sports and Exercise
|November 5, 2020
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Summary
This summary is machine-generated.

Obese patients experienced improved exercise tolerance after a 3-week weight loss program. This intervention reduced the heart rate slow component, aiding exercise prescription for better results.

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Area of Science:

  • Exercise Physiology
  • Obesity Research
  • Cardiovascular Health

Background:

  • The
  • slow component
  • of heart rate (HR) kinetics poses challenges for exercise prescription in obese individuals.
  • This phenomenon, observed in healthy subjects, may be exacerbated in obesity.

Purpose of the Study:

  • To investigate the impact of a multidisciplinary body mass reduction program on HR kinetics and exercise tolerance in obese patients.
  • To assess whether the intervention facilitates exercise prescription at fixed HR values.

Main Methods:

  • Sixteen obese males underwent testing before and after a 3-week weight loss intervention.
  • Exercise tests included incremental exercise to exhaustion and constant work rate exercises (moderate and heavy intensity, and HR-clamped).
  • Measurements included peak pulmonary oxygen uptake (V˙O2peak), gas exchange threshold (GET), and HR.

Main Results:

  • V˙O2peak and GET did not significantly change post-intervention.
  • The HR slow component was eliminated during moderate-intensity exercise and reduced during heavy-intensity exercise after the intervention.
  • Work rate adjustments needed to maintain a constant HR decreased significantly post-intervention.

Conclusions:

  • A 3-week body mass reduction program improved exercise tolerance in obese patients by mitigating the HR slow component.
  • The intervention facilitated exercise prescription by enabling a fixed submaximal HR to correspond to a work rate above GET.