DSpace community: 附設醫院復健部

Heart Rate Responses and Oxygen Consumption during Tai Chi Chuan Practice

Wed, 21 Oct 2009 07:45:09 GMT

title: Heart Rate Responses and Oxygen Consumption during Tai Chi Chuan Practice abstract: Tai Chi Chuan (TCC) is a popular Chinese conditioning exercise, however, its exercise intensity remains controversial. The objective of this study was to determine the, exercise intensity of Yang TCC by measuring heart rate( HR) responses and oxygen consumption ((V) over dot O-2) during practice. Fifteen men aged 39.9 +/- 9.5 yrs (range 26 -56 yrs) participated in this study. Subjects had practiced classical Yang TCC for 5.8 +/- 2.4 years. HR responses and ( V) over dot O-2 were measured during practice of TCC by using a K4 telemetry system. Blood lactate was measured before and immediately after TCC practice. Additionally, breath- by-breath measurement of cardiorespiratory function and sequential determination of blood lactate were performed during the incremental exercise of leg cycling. Measurements obtained during the TCC practice and exercise testing were compared to determine the exercise intensity of TCC . While performing TCC, the mean HR of subjects was 140+ /- 10 bpm, and the mean (V) over dot O-2 was 21.4 +/- 1.5 mL .kg(-1)min(-1). Compared with the data of the exercise test, the FIR during practice was 58% of the heart rate range. Meanwhile, the (V) over dot O-2 during TCC practice was 55% of the (V) over dot O-2peak. Additionally, the level of blood lactate immediately after TCC practice was 3.8 mM, which reflected the level of lactate during TCC, approximated the onset of blood lactate accumulation ( OBLA). The results demonstrate that TCC is an exercise with moderate intensity, and is aerobic in nature.

Relative Exercise Intensity of Tai Chi Chuan Is Similar in Different Ages and Gender

Wed, 21 Oct 2009 07:41:48 GMT

title: Relative Exercise Intensity of Tai Chi Chuan Is Similar in Different Ages and Gender abstract: This study aims to determine the relative exercise intensity of classical Yang Tai Chi Chuan (TCC) in different ages and gender, One hundred TCC practitioners (54 men and 46 women) aged 25 to 80 years participated in this investigation. Men and women were separated into three groups: young (25-44 y/ o), middle-aged (45-64 y/o) and elderly (65-80 y/o). Heart rate (HR) responses during TCC practice were measured by using electrocardiographic telemetry, An exercise test with breath-by-breath measurements of cardiorespiratory function was also performed for each subject during the incremental exercise of leg cycling. Measurements obtained during the TCC practice and exercise testing were compared to determine the exercise intensity of TCC. While performing TCC, the mean HR of men was 141 +/- 12 bpm, 132 +/- 9 bpm and 120 +/- 10 bpm in the young, middle-aged and elderly groups, respectively. Men practiced TCC with mean HR corresponding to 57.8 +/- 3.7%, 56.6 +/- 3.4% and 55.1 +/- 3.1 % of heart rate reserve (HRR) in the three groups. Meanwhile, the mean HR of women was 136 +/- 10 bpm, 126 +/- 11 bpm and 115 +/- 12 bpm in the young, middle-aged and elderly groups, respectively. Women practiced TCC with mean HR corresponding to 52.7 +/- 2.8%, 51.5 +/- 2.6% and 50.3 +/- 2.9% of HRR in the three age groups. The results demonstrate that classical Yang TCC is an exercise with moderate intensity, and its exercise intensity is similar across different ages in each gender. In conclusion, TCC is an aerobic exercise and suitable for participants of different ages and gender to improve their functional capacity.

Improvement of Cardiorespiratory Function after Percutaneous Transluminal Coronary Angioplasty or Coronary Artery Bypass Grafting Bypass Grafting

Wed, 21 Oct 2009 07:39:24 GMT

title: Improvement of Cardiorespiratory Function after Percutaneous Transluminal Coronary Angioplasty or Coronary Artery Bypass Grafting Bypass Grafting　 abstract: Objective: The objective of this study was to investigate the effect of a 3-mo training program for patients with either a percutaneous transluminal coronary angioplasty ( PTCA) or a coronary artery bypass grafting (CABG). Design: Forty-four patients participated in a 3-mo outpatient cardiac rehabilitation program. Graded exercise tests with gas analysis were conducted before and after training to evaluate the changes of cardiorespiratory function. Results: In the pretraining examination, the PTCA group showed a higher peak oxygen uptake (Vo(2peak)) and work rate than the CABG group. In the posttraining examination, the PTCA group increased 14.6% in Vo(2peak). Meanwhile, the CABG group increased 32.8% in Vo(2peak). At the ventilatory threshold, both groups also significantly increased in Vo(2). Conclusions: A 3-mo cardiac rehabilitation program for patients with PTCA or CABG could favorably enhance their cardiorespiratory function. Although the pretraining Vo(2 peak) was lower for the patients with CABG, their training potential was greater, and hence they could achieve a similar level of aerobic capacity as the PTCA group.

Poor Functional Recovery May Indicate Restenosis in Patients after Coronary Angioplasty

Wed, 21 Oct 2009 07:35:55 GMT

title: Poor Functional Recovery May Indicate Restenosis in Patients after Coronary Angioplasty abstract: Objective: To investigate whether poor response to exercise training can detect restenosis in asymptomatic patients after percutaneous transluminal coronary angioplasty (PTCA). Design: Case-control study. Setting: A hospital-based outpatient cardiac rehabilitation program in Taiwan. Participants: Sixteen patients aged 49.7+/-7.8 years who had undergone PTCA and completed a 3-month exercise program. Patients were separated into a restenosis group (n=7; age, 46.4+/-9.8y) and a nortrestenosis group (n=9; age, 52.3+/-12 .9y), according to their angiography follow-up results. The interval between PTCA and angiography ranged from 6 months to 2 years. Intervention: Bicycle exercise workouts were conducted 3 times a week during rehabilitation, with exercise intensity adjusted to each patient's ventilatory threshold. Main Outcome Measures: A graded exercise test with gas analysis was conducted before training, at 6 weeks and at 3 months after training, to evaluate the sequential changes of cardiorespiratory function. Results: After 3 months of training, the nonrestenosis group showed an increase of 30.4% in peak oxygen uptake (VO( 2)peak, P<.05) 13.7% in peak oxygen pulse (P<.05), 22.2% in peak rate- pressure product (P<.05), and 13.6% in peak work rate (P<.05 ). Most of the improvement occurred within the first 6 weeks of training. The restenosis group did not show significant increase in these variables. At the ventilatory threshold, the nonrestenosis group also displayed a significant increase of (V)over dotO(2) oxygen pulse, and work rate. However, the restenosis group showed no improvement after training. Conclusion: Functional recovery appears to be a good indicator of restenosis for patients after PTCA. A poor response to exercise can be noted within 6 weeks of training in PTCA patients with restenosis.