Effects of 24 weeks strength training with and without unstable devices on strength, flexibility and quality of life in older women: A secondary analysis from randomized controlled trial

Abstract

BACKGROUND: Combining strength training (ST) with unstable surfaces (US) is a promising complementary approach to traditional ST to optimize muscle strength and balance in different populations. OBJECTIVE: To evaluate the effects of traditional ST and ST+US on grip strength, flexibility and quality of life in older women. METHODS: Fifty-eight older women were randomly assigned into ST (n= 22), ST+US (n= 22) or control (n= 14) group. Exercise groups performed whole-body, moderate-intensity strength exercises, thrice a week during 24-weeks. ST+US participants performed the same exercise prescription progressively adding unstable surfaces and devices. Dependent variables (grip strength, flexibility and health-related quality of life) were measured at baseline, 12-weeks and after 24-weeks of intervention. RESULTS: At completion of 24-weeks, compared with control group, traditional ST promote flexibility gains [SRT =+ 5.42 cm (95% CI = 1.01 to 9.83)]. Both training regimes improved quality of life [ST =+9.50 (95% CI = 1.80 to 17.20); ST+US =+ 15.23 (95%CI = 7.37 to 23.08). No significant between-group difference was observed for grip strength at completion of the intervention. CONCLUSION: Traditional strength exercises were effective to improve flexibility and health-related quality of life among healthy older women. Combining unstable devices with traditional exercise did not provide additional gains in order to promote flexibility and quality of life.