摘要:

ABSTRACTEWART, C. K. Psychological effects of resistive weight training: implications for cardiac patients.Med. Sci. Sports Exerc., Vol. 21, No. 6, pp. 683–688, 1989. Cardiac patients' perceptions of their physical capabilities (“self-efficacy”) often exert greater influence over their return to normal activities than does their actual medical status. The first part of this review explains how self-efficacy perceptions are formed and how participation in resistive weight training can promote adherence to safe and effective exercise. The second part of the paper reviews data showing how exercise contributes to emotional well-being and reports changes in self-efficacy and negative affect that recently have been found to accompany strength gains achieved in circuit weight training.

ISSN:0195-9131    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

ABSTRACTHURLEY, B. F. Effects of resistive training on lipoprotein-lipid profiles: a comparison to aerobic exercise training.Med. Sci. Sports Exerc., Vol. 21, No. 6, pp. 689–693, 1989. A recent surge of cross-sectional and longitudinal studies dealing with resistive training and lipid profiles have produced conflicting results. The majority of cross-sectional studies demonstrate a reduced HDL cholesterol level or elevated total cholesterol to HDL ratio in strength trained athletes as compared with endurance trained athletes. Because of selection biases from many of these studies, there is a lack of control for factors that may influence lipids and lipoproteins, such as age, body composition, diet, and anabolic-androgenic steroid use. Most investigators have reported improved lipoprotein-lipid profiles from resistive training programs. However, many of these studies have design flaws or limitations that make their conclusions questionable. The most serious design flaws include the combination of no control group and only one blood sample taken before and after training, the use of subjects who have low risk profiles, and the lack of control for dietary effects. In a recent study in which we attempted to control for these factors, no changes in lipid profiles were observed after 20 wk of resistive training among individuals at risk for coronary heart disease (CHD). A group serving as reference controls who participated in aerobic-type exercise training during the same time period reduced their plasma triglyceride levels but did not alter their cholesterol or lipoprotein levels. No changes in any lipids or lipoproteins were observed in a group of inactive controls. Thus, resistive training does not appear to alter lipoprotein-lipid profiles among individuals at risk for CHD.

ISSN:0195-9131    

出版商:OVID    

年代:1989

数据来源: OVID

摘要:

ABSTRACTEFFRON, M. B. Effects of resistive training on left ventricular function.Med. Sci. Sports Exerc., Vo. 21, No. 6, pp. 694–697, 1989. Although several studies have evaluated the effects of endurance training on left ventricular (LV) function, few studies have looked at resistive training effects. Acute isometric exercise increases blood pressure and has little effect on LV function, causing only mild increases in ejection fraction and stroke volume index. However, acute isometric exercise does increase LV diastolic diameter to a lesser extent than dynamic exercise. Most studies of resistive training on LV function have been cross-sectional or short term (10 to 12 wk) training studies on athletes and suggest that increases in LV wall thickness and mass are dependent upon the intensity and duration of training. Most resistive training studies show no increase in left ventricular volume, as can be seen in endurance trained athletes. Despite the increase in LV mass with resistive training, indices of LV systolic and diastolic function do not change. In hypertensive and cardiac patients with normal LV function at rest, resistive training increases LV mass index without deleterious effects on LV systolic and diastolic function. However, in patients with abnormal resting LV function, resistive training can have adverse effects on LV systolic function. Overall, moderate levels of resistive training can be a useful adjunct to cardiac rehabilitation programs, with the caveat that it be used with caution in patients with abnormal LV function at rest.

ISSN:0195-9131    

出版商:OVID    

年代:1989

数据来源: OVID

ISSN:0195-9131    

出版商:OVID    

年代:1989

数据来源: OVID