Poor Handgrip Strength And Risk Of Falls In Older Women

Abstract

RESULTS: Six healthy males completed this study (age: 26 ± 3 years, V O2max: 56 ± 9 mL∙ kg ∙ min). V E was matched well between EX and HYP (EX-30%: 53 ± 10 vs. HYP-30%: 56 ± 14; EX-60%: 86 ± 14 vs. HYP-60%: 87 ± 18; EX-90%: 159 ± 31 vs. HYP-90%: 142 ± 40 L∙ min , all p > 0.05). BFI-VL increased from 0.15 ± 0.09 μM·second at rest to 2.57 ± 1.10 μM·second 1 during the EX-30% trial and 0.44 ± 0.23 μM·second during the HYP-30% trial and did not significantly increase thereafter in either condition. No interaction effect was observed between condition and intensity, however, BFI-VL was significantly greater in the EX trials compared to the HYP trials (p < 0.05). BFI-SCM increased slightly from 0.87 ± 0.48 μM·second to 1.01 ± 0.54 and 1.67 ± 1.54 μM·second in the EX-30% and HYP-30% trials respectively. We observed no effects of condition or intensity when measuring BFI-SCM (p > 0.05). At rest BFI-7IC was 0.84±0.59 μM·second and in the EX-30% and HYP-30% trials increased to 1.20 ± 0.75 and 1.26 ± 0.60 μM·second, respectively. No differences in BFI-7IC were observed between condition or intensity (p > 0.05). CONCLUSION: Previous studies have shown that during heavy whole-body exercise there exists a competition for blood flow between the locomotor and respiratory muscles during heavy, whole-body exercise. In this study, BFI-SCM was similar between exercise and hyperpnea mimicking trials across a range of ventilations, suggesting blood flow to accessory respiratory muscles is preserved during exercise. Funding: NSERC