The effect of two structured exercise programmes on the bone mass of 48 healthy postmenopausal white women aged 50-62 was studied after one year. Volunteers were randomised to group 1 (control), group 2 (aerobic exercise), or group 3 (aerobic and strengthening exercises). Before and after the training programme each subject had evaluations of bone mass (determined by neutron activation analysis and expressed as calcium bone index) and maximum oxygen uptake attained on a multistage exercise treadmill test.After one year both exercise groups had higher levels of fitness and greater bone mass than controls. Mean values (2 SEM) for changes in the calcium bone index were -0.011 (0.037), 0-039 (0.035), and 0-066 (0.036) for groups 1, 2, and 3, respectively. Analysis of variance on the observed data and analysis of covariance adjusting changes to the initial mean value for the whole group showed significant differences between each exercise group and the controls but no difference between the exercise groups themselves. Both exercise groups showed a significant improvement in maximum oxygen uptake.This study suggests that exercise may modify bone loss in healthy postmenopausal women.
The efficacy of an exercise program was investigated in a study of 89 post-menopausal women with osteoporosis over a 5-year follow-up period. The study attempted to examine and compare potential differences in bone mineral density (BMD), incidence of fracture, and loss of height, between a group of patients (n = 42) who attended the supervised exercise program in the hospital, and a group (n = 47) who exercised at home. Habitual physical activity, as estimated using the Harvard Alumni Questionnaire, and a Physical Activity Index were combined to obtain an estimate of overall weekly caloric expenditure over the 5-year period. The exercise program involved weight-bearing aerobic activities of moderate intensity, and muscle strengthening exercise using free weights. The mean percentage change for the lumbar BMD was + 4.4% in the hospital group and +3.4% in the home group while for the femoral neck BMD was + 1.1% in the hospital group and -0.9% in the home group. There was a significant reduction in the number of fractures and no significant loss of height over the 5-year follow-up period for both groups. As the correlation between BMD and weekly caloric expenditure of the subjects was not significant, no conclusion can be drawn as to the minimum level of caloric expenditure necessary in order to retard bone loss. It was concluded that for the post-menopausal women with osteoporosis who participated in the program it was possible to stabilize their height and the BMD of the lumbar site, and to reduce fractures over the 5-year study period regardless if they exercised in a supervised or in an unsupervised setting.
The value of a program for the rehabilitation of osteoporotic patients (PRO) was assessed from a 4-year follow up of 139 patients referred to the program over its initial 2 years of operation. The program consisted of educational seminars, social activities and regular exercise supervision. Patients had annual clinical assessments, and bone mass measurements by neutron activation analysis (reported as CaBI). Fitness was assessed by performance on a treadmill (reported in terms of VO2max, ml/kg/min). Seventy-eight of the 139 patients remained in the program over the 4-year follow-up. This unusually high level of commitment to the program is indicative of the psychological value that patients have derived from it. The effect of the program on the osteoporosis process was inconclusive. Group 2, the 37 patients who obtained the greatest improvement in fitness (VO2max > 6 ml/kg/min), had a significantly greater reduction in back pain than did group 1, the 36 with less significant improvement (VO2max < or = 6 ml/kg/min). The bone mass and incidence of vertebral fractures on entry into the program were not significantly different between the two groups. Group 2 had on average a greater increase in bone mass over the 4 years; mean increases in CaBI, (+/- SD) were 0.09 +/- 0.09 and 0.05 +/- 0.10 for groups 2 and 1 respectively. Group 2 had on average fewer new vertebral fractures (0.08 +/- 0.36 and 0.28 +/- 0.75 for groups 2 and 1 respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
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