KMID : 1139220210170050362
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Journal of Exercise Rehabilitation 2021 Volume.17 No. 5 p.362 ~ p.368
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Agreement between heart rate at first ventilatory threshold on treadmill and at 6-min walk test in coronary artery disease patients on ¥â-blockers treatment
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Calegari Leonardo
Moreira Igor Falkowski Andrei Reolao Jose Basileu Caon Karsten Marlus Deresz Luis Fernando
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Abstract
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The purpose of this study was to verify the accuracy of the agreement between heart rate at the first ventilatory threshold (HRVT1) and heart rate at the end of the 6-min walk test (HR6MWT) in coronary artery disease (CAD) patients on ¥â-blockers treatment. This was a cross-sectional study with stable CAD patients, which performed a cardiopulmonary exercise test (CPET) on a treadmill and a 6-min walk test (6MWT) on nonconsecutive days. The accuracy of agreement between HRVT1 and HR6MWT was evaluated by Bland?Altman analysis and Lin¡¯s concordance correlation coefficient (rc), mean absolute percentage error (MAPE), and standard error of estimate (SEE). Seventeen stable CAD patients on ¥â-blockers treatment (male, 64.7%; age, 61¡¾ 10 years) were included in data analysis. The Bland?Altman analysis revealed a negative bias of -0.41 ¡¾ 6.4 bpm (95% limits of agreements, -13 to 12.2 bpm) between HRVT1 and HR6MWT. There was acceptable agreement between HRVT1 and HR6MWT (rc = 0.84; 95% confidence interval, 0.63 to 0.93; study power analysis= 0.79). The MAPE of the HR6MWT was 5.1% and SEE was 6.6 bpm. The ratio HRVT1/HRpeak and HR6MWT/HRpeak from CPET were not significantly different (81%¡¾ 5% vs. 81%¡¾ 6%, P= 0.85); respectively. There was a high correlation between HRVT1 and HR6MWT (r= 0.85, P< 0.0001). Finally, the results of the present study demonstrate that there was an acceptable agreement between HRVT1 and HR6MWT in CAD patients on ¥â-blockers treatment and suggest that HR6MWT may be useful to prescribe and control aerobic exercise intensity in cardiac rehabilitation programs.
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KEYWORD
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Heart rate, Ventilatory threshold, 6-Minute walk test, Cardiac rehabilitation, Coronary artery disease
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