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

Michael J. Simmonds, Clare L. Minahan, Kevin R. Serre, Gregory C. Gass, Sonya M. Marshall-Gradisnik, Luke J. Haseler, Surendran Sabapathy

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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.

Original languageEnglish
Pages (from-to)87-99
Number of pages13
JournalClinical Hemorheology and Microcirculation
Volume51
Issue number2
DOIs
Publication statusPublished - 2012

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Hemorheology
Type 2 Diabetes Mellitus
Walking
Heart Rate
Exercise
Cell Aggregation
Erythrocytes
Gases
Prescriptions
Oxygen

Cite this

Simmonds, Michael J. ; Minahan, Clare L. ; Serre, Kevin R. ; Gass, Gregory C. ; Marshall-Gradisnik, Sonya M. ; Haseler, Luke J. ; Sabapathy, Surendran. / 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. In: Clinical Hemorheology and Microcirculation. 2012 ; Vol. 51, No. 2. pp. 87-99.
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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. / Simmonds, Michael J.; Minahan, Clare L.; Serre, Kevin R.; Gass, Gregory C.; Marshall-Gradisnik, Sonya M.; Haseler, Luke J.; Sabapathy, Surendran.

In: Clinical Hemorheology and Microcirculation, Vol. 51, No. 2, 2012, p. 87-99.

Research output: Contribution to journalArticleResearchpeer-review

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