PURPOSE: For patients starting a cardiac rehabilitation program, exercise intensity often is set 20 beats per minute above the standing resting heart rate (RHR+20) or in a range of 11 to 13 on Borg's Scale for Rating of Perceived Exertion (RPE 11-13). The purpose of this study was to determine the actual exercise intensity, expressed as a percentage of peak oxygen uptake reserve (%VO2R) using these techniques. METHODS: For this study, 11 new referrals to a phase 2 cardiac rehabilitation program voluntarily underwent a symptom-limited exercise test and a field test that consisted of self-paced over-the-ground walking for 10 minutes at levels corresponding to RPE 11-13 and RHR+20. During both tests, gas exchange data were obtained via the Cosmed K4b and heart rate via the Polar monitor. RESULTS: The mean %VO2R at RHR+20 (41.8 +/- 12.3%) and RPE 11-13 (71 +/- 15.3% mL.kg.min) were significantly different. Exercise at RHR+20 resulted in 4 of the 11 patients (36%) exercising at less than 40% VO2R, 6 of the patients (55%) exercising at 40% to 60% VO2R, and 1 of the patients (9%) exercising at more than 60% VO2R. Exercise at RPE 11-13 resulted in 1 of the 11 patients (9%) exercising at less than 40% VO2R, 1 of the patients at exercising at 40% to 60% VO2R (9%), and 9 of the patients (82%) exercising at more than 60% VO2R. CONCLUSIONS: The results of this study indicate that using RHR+20 or RPE 11-13 to prescribe exercise intensity during over-the-ground walking for phase 2 cardiac rehabilitation patients results in substantial intersubject variability and raises questions about the safety and efficacy of these approaches.
PURPOSE: For patients starting a cardiac rehabilitation program, exercise intensity often is set 20 beats per minute above the standing resting heart rate (RHR+20) or in a range of 11 to 13 on Borg's Scale for Rating of Perceived Exertion (RPE 11-13). The purpose of this study was to determine the actual exercise intensity, expressed as a percentage of peak oxygen uptake reserve (%VO2R) using these techniques. METHODS: For this study, 11 new referrals to a phase 2 cardiac rehabilitation program voluntarily underwent a symptom-limited exercise test and a field test that consisted of self-paced over-the-ground walking for 10 minutes at levels corresponding to RPE 11-13 and RHR+20. During both tests, gas exchange data were obtained via the Cosmed K4b and heart rate via the Polar monitor. RESULTS: The mean %VO2R at RHR+20 (41.8 +/- 12.3%) and RPE 11-13 (71 +/- 15.3% mL.kg.min) were significantly different. Exercise at RHR+20 resulted in 4 of the 11 patients (36%) exercising at less than 40% VO2R, 6 of the patients (55%) exercising at 40% to 60% VO2R, and 1 of the patients (9%) exercising at more than 60% VO2R. Exercise at RPE 11-13 resulted in 1 of the 11 patients (9%) exercising at less than 40% VO2R, 1 of the patients at exercising at 40% to 60% VO2R (9%), and 9 of the patients (82%) exercising at more than 60% VO2R. CONCLUSIONS: The results of this study indicate that using RHR+20 or RPE 11-13 to prescribe exercise intensity during over-the-ground walking for phase 2 cardiac rehabilitation patients results in substantial intersubject variability and raises questions about the safety and efficacy of these approaches.
Authors: Gordon R Reeves; David J Whellan; Pamela Duncan; Christopher M O'Connor; Amy M Pastva; Joel D Eggebeen; Leigh Ann Hewston; Timothy M Morgan; Shelby D Reed; W Jack Rejeski; Robert J Mentz; Paul B Rosenberg; Dalane W Kitzman Journal: Am Heart J Date: 2016-12-28 Impact factor: 4.749
Authors: Johannes Scherr; Bernd Wolfarth; Jeffrey W Christle; Axel Pressler; Stefan Wagenpfeil; Martin Halle Journal: Eur J Appl Physiol Date: 2012-05-22 Impact factor: 3.078
Authors: Helen H Host; Catherine E Lang; Mary W Hildebrand; Dequan Zou; Ellen F Binder; Carolyn M Baum; Kenneth E Freedland; Nancy Morrow-Howell; Eric J Lenze Journal: Phys Occup Ther Geriatr Date: 2014-06
Authors: Amy M Pastva; Pamela W Duncan; Gordon R Reeves; M Benjamin Nelson; David J Whellan; Christopher M O'Connor; Joel D Eggebeen; Leigh Ann Hewston; Karen M Taylor; Robert J Mentz; Paul B Rosenberg; Dalane W Kitzman Journal: Contemp Clin Trials Date: 2017-10-25 Impact factor: 2.226