Ratings of perceived exertion at anaerobic threshold in patients with coronary artery disease

Abstract

The study aimed to identify and compare the ratings of perceived exertion (RPE) at the ventilatory anaerobic threshold (VAT) in healthy subjects and patients with coronary artery disease (CAD). A total of 30 male subjects took part in the study and were divided into three groups: a control group (CG) composed of 10 healthy participants; a group composed of 10 participants diagnosed with CAD beta-blocker user (G-DACb); and a group composed of 10 participants with CAD non-beta-blocker user (G-DAC). The participants performed a cardiopulmonary exercise test (CPET) with continuous type ramp protocol to determine the VAT, through the visual graphical analysis (loss of parallelism between the oxygen uptake and the carbon dioxide output). During CPET, before the end of each one-minute period, the subjects were asked to rate dyspnea (RPE-D) and leg fatigue (RPE-L) on the Borg CR-10 scale. After the VAT was determined, the score that the participants gave on the Borg CR10 scale was verified. CG participants showed higher workload, oxygen uptake, carbon dioxide output, ventilation and heart rate at the VAT compared to the G-DAC and G-DACb (p<0.05). However, regarding the RPE-L and the RPE-D, no significant difference between the groups were observed (p<0.05). Values between five and six on Borg CR-10 scale matched the VAT in the subjects studied. However, other parameters must be concomitantly used for prescribing exercise intensity in physical training protocols, at levels close to the VAT for patients with CAD.

Metabolic equivalents fail to indicate metabolic load in post-myocardial infarction patients during the modified Bruce treadmill walking test

“…A study by Scherr et al 28 comparing graded exercise RPE values of coronary artery disease (CAD) patients (n=146, mean age 66 years, BMI 26.7 and 2 hours of weekly exercise) with non-cardiac participants (n=2560), using the Borg 6–20 scale, 19 showed CAD patients significantly under-rated RPE at blood lactate values of 3.0 and 4.0 mmoL/L compared with non-cardiac controls (3 mmoL/L: CAD, 12.0±1.7 vs total cohort, 13.0±1.9 RPE, p<0.001; 4 mmoL/L: CAD, 14.0±1.7 vs total cohort, 14.2±1.9 RPE, p<0.01). Forti 29 also found male CAD patients (mean age 56 years, n=10, taking beta-blockers, and n=10, not taking beta-blockers) to report significantly lower RPE values (Borg CR 10 scale) 30 during cycle ergometry compared with n=10 non-cardiac patients (RPE: 4.9, 5.9 and 6.5, respectively). Additionally, Joo et al 31 reported there is to be substantial intersubjective variability from n=11 cardiac patients (of mix condition and gender taking beta-blockers) during overground walking at RPE 11–13 19 from the 6–20 scale in relation to predetermined % V O 2 reserve ( V O 2 R).…”

The Borg CR-10 scale is suitable to quantify aerobic exercise intensity in women with fibromyalgia syndrome

“…However, it has been shown that groups with different characteristics (e.g., male and female, active and sedentary, etc.) have similar RPE values at certain times of the exercise such as VAT and exercise peak [9][10][11] . The authors reported that the fact that RPE at VAT does not vary among individuals with different characteristics enables its use as complementary tool for physical exercise prescription.…”

“…In this sense, some authors have proposed the Borg CR-10 scale as a complementary tool to determine the workload related to VAT [9][10][11] . In addition, RPE has been used to prescribe exercise intensity, especially during non-supervised exercises, as it increases the accuracy and assertiveness in keeping the prescribed exercise intensity 6,11,12 .…”

“…In this sense, some authors have proposed the Borg CR-10 scale as a complementary tool to determine the workload related to VAT [9][10][11] . In addition, RPE has been used to prescribe exercise intensity, especially during non-supervised exercises, as it increases the accuracy and assertiveness in keeping the prescribed exercise intensity 6,11,12 . Therefore, determining RPE corresponding to VAT and determining if the RPE behavior during incremental exercise test in women with FMS differs from healthy individuals is relevant to improve the effectiveness of non-supervised exercises for this population.…”

Non spirographic or noninvasive methods to estimate anaerobic treshold

“…In other hand no differences were noticed in women in physical activity level in Borg´s scale, both groups showed AnT closed to level 5 in Borg´s 10 points scale (Zamunér et al, 2011). In coronary artery disease patients show 5-6 values in ventilator anaerobic threshold determination, and results may be explained by their physical condition (Forti, Zamunér, Kunz, Salviati, Nery, & Silva, 2014) In heart failure patients the exercise guided by the Borg scale maintains the patient's HR between the anaerobic threshold in the exercise training zone important parameter in this populations (Carvalho, Bocchi, & Guimarães, 2009) and its use its recommended in physicians, physical therapist and medical staff for determining the intensity of resistance exercise in clinical practice (Mahler & Rostan, 1990; Morishita, Yamauchi, Fujisawa, & Domen, 2014)…”