Résumé
@#Objective To explore the consistency of different intensity setting methods of aerobic exercise in order to provide the safe and effective strength setting method for patients with coronary heart disease (CHD).Methods From July, 2016 to July, 2017, CHD patients in our hospital were recruited. The basic data were collected. The patients received cardiopulmonary exercise test firstly to obtain anaerobic threshold, peak oxygen intake and other indicators. They underwent Six-minute Walk Test after a day off. The target heart rate was calculated using anaerobic threshold method (AT), peak oxygen uptake index method (PI), heart rate reserve method (HRR), age estimates method (AE) and quiet heart rate plus 20 method (HR20), respectively. The correlation and consistency of different methods were analyzed.Results There was no correlation (r=-0.131, P>0.05) and there was a very significant difference (P<0.001) between AE and AT on determining target heart rate. There was no correlation (r=0.372, P>0.05) between HR20 and AT. There was correlation (r=0.872, P<0.01) and there was no significant difference (P>0.05) between PI and AT on determining the target heart rate, and the Bland-Altman test showed a consistency between them. There was correlation (r=0.836, P<0.001) and there was no significant difference (P>0.05) between HRR and AT on determining the target heart rate, and Bland-Altman test demonstrated a consistency between them.Conclusion There was no correlation and consistency of AE and HR20 to AT on the target intensity of aerobic exercise. There was significant correlation and consistency between AT and HRR/PI.
Résumé
Exercise intensity is one of the major determinats in the exercise prescription, where THR plays an important role. This study was designed to reemphasize the usefulness of the Karvonen's formula with special regard to the anaerobic threshold (AT) in the exercise prescription to middle-aged healthy men. Fifty normal adult subjects between 30 and 59 years who were refered to the Life Planning Center for the evaluation of physical fitness were selected for the study. Symptom limited maximal treadmill stress testing after Bruce's protocol was performed for all subjects and AT was determined as the level, where the minute ventilatory volume curve during exercise revealed the first breaking point. The heart rate at AT (HR<SUB>AT</SUB>) was compared to those obtained by the Karvonen's formula (k=0.6) and the other conventional method, in which the 70% and 85% of the maximal heart rate (HRmax) were determined as an optimal range for the exercise intensity. The following results were obtained: the average value of HRAT just coincided with the THR obtained with Karvonen's formula and its±1 S.D. values just fitted into the range of 70% and 85% of HRmax, respectively. THR by the Karvonen's formula varies with k values and is mostly affected by the resting heart rate (HRr) . If the k is fixed to 0.6, THR thus obtained can keep its range between 70% and 85% of HRmax under the normal range of HRr (mean±2 S. D. ; 37-116 bpm) . Moreover, THRs obtained from the Karvonen's formula (k=0.6) using the age predicted HRmax were best fitted into the ones derived from the HRmax obtained by the maximal exercise testings. Thus, THR detemined by the Karvonen's flrmula (k=0.6) can be the most suitable with regard to the anaerobic threshold and the most reliable within the wide range of normal resting heart rate.