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Walking with blood flow restriction improves the dynamic strength of women with osteoporosis
Pereira Neto EA, Bittar ST, da Silva JCG, Pfeiffer PAS, dos Santos HH, de Sousa MdSC
Revista Brasileira de Medicina do Esporte [Brazilian Journal of Sports Medicine] 2018 Mar-Apr;24(2):135-139
clinical trial
3/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: No. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

INTRODUCTION: Improving strength levels is important to women with osteoporosis. Resistance and aerobic exercise are effective means of reaching this goal; however, the use of low-load exercises with blood flow restriction is an alternative to traditional methods of exercise to achieve the same strength gains in this population. OBJECTIVE: To analyze the chronic effects of aerobic and resistance training combined with blood flow restriction on the maximal dynamic strength (MDS) of women with osteoporosis. METHODS: Twenty women (61.40 +/- 4.63 years of age, 61.82 +/- 12.54 kg, 1.51 +/- 0.05 m, 27.16 +/- 5.55 kg/m2) were randomly assigned to four groups: (1) high-intensity resistance training (HI); (2) low-intensity resistance training with blood flow restriction (LI-BFR); (3) aerobic training with blood flow restriction (ABFR); and (4) control group (CG). Unilateral knee extension MDS was assessed using the one-repetition maximum (1RM) strength test before and after the 6th and 12th weeks of intervention. The data were analyzed using repeated measures analysis of variance (ANOVA) with a Bonferroni post-hoc test performed using SPSS (version 21.0), considering a significance level of p < 0.05 for all tests. RESULTS: Baseline comparisons showed that HI and CG had lower strength levels than LI-BFR and ABFR groups (p < 0.05). The ABFR group exhibited a significant increase in MDS between the 1st and the 6th week (9%, p = 0.001) and between the 1st and the 12th week (21.6%, p = 0.008). The LI-BFR group exhibited increased MDS between the 1st and the 6th week (10.1%, p = 0.001), between the 1st and the 12th week (24.2%, p = 0.003) and between the 6th and 12th week (12.8%, p = 0.030). The HI group exhibited a significant difference between the 1st and the 6th week (38.7%, p < 0.001), between the 1st and the 12th week (62%, p < 0.001) and between the 6th and 12th weeks (17.4%, p = 0.020), whereas the CG had no significant differences between the timepoints (p > 0.05). CONCLUSIONS: ABFR and LI-BFR effectively increased the MDS of women with osteoporosis.

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