Title

Preliminary findings in the heart rate variability and haemorheology response to varied frequency and duration of walking in women 65–74 yr with type 2 diabetes

Date of this Version

1-1-2012

Document Type

Journal Article

Publication Details

Citation only

Simmonds, M.J., Minahan, C.L., Serre, .R., Gass, G.C., Marshall-Gradisnik, S.M., Haseler, L.J., & Sabapathy, S. (2012). Preliminary findings in the heart rate variability and haemorheology response to varied frequency and duration of walking in women 65–74 yr with type 2 diabetes. Clinical Hemorheology and Microcirculation, 51(2), 87-99

Access the journal

2012 HERDC submission. FoR codes: 110799; 111701; 119999

© Copyright IOS Press and The Authors, 2012

ISSN

1875-8622

Abstract

Heart rate variability (HRV) and haemorheology adaptations to 12 wk of varied-dose treadmill walking were investigated in women aged 65–74 yr with type 2 diabetes. Subjects were randomly allocated into two groups where exercise frequency and session duration were manipulated (Group 1 : 2 × 60 min·wk−1 or Group 2 : 4 × 30 min·wk−1), but intensity and accumulated weekly duration of exercise were consistent between groups (100% gas-exchange threshold; 120 min·wk−1).

Twelve weeks of exercise training significantly improved peak oxygen uptake, time to exhaustion, and gas-exchange threshold (p < 0.05), independent of exercise group. Exercise training did not significantly change glycaemic control or body mass. Red blood cell (RBC) aggregation and RBC deformability significantly decreased (p < 0.05) for both groups. No change in HRV was observed for Group 1, whereas several key indicators of HRV were significantly improved in Group 2 (p < 0.05). The present study was the first to report decreased RBC aggregation following an exercise-only intervention and that exercise training improved RBC aggregation without a concomitant improvement in glycaemic control.

The accumulated weekly exercise duration may be the most important training component for the prescription of exercise in older women with type 2 diabetes.

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This document has been peer reviewed.