Abstract
Background: We aimed to determine the time course of resting and exercise heart rates (HR); blood pressure (BP), changes in peak VO 2 , time to exhaustion (TTE) and gas exchange threshold (Tge) at a constant weekly exercise time [120 mins] with counterbalanced variations in exercise duration (60 vs. 30min) and weekly visits (2 vs. 4 .wk -1 session per week). Methods: Forty-six women aged 65-74 years were randomly assigned to 2 or 4 sessions.wk -1 ) for six weeks. Results: Principal findings: (i) significant increase in Tge at six weeks, with no significant differences between exercise frequency or duration; (ii) no significant increase in peak values for VO 2 , HR, minute ventilation and respiratory quotient after six weeks exercise training (iii) significant decreases in diastolic blood pressure (DBP) at rest and during exercise only in the 4 sessions.wk -1 group and (iv) significant decrease in systolic blood pressure (SBP) during exercise and post-exercise period for both groups and rapid time course changes in HR and BP. Conclusions: Exercise elicited rapid reductions in HR and SBP during exercise and post-exercise recovery periods for both groups and there was no significant interaction between exercise duration and exercise frequency.
Highlights
In healthy women, aged 65-74 years, with no history of chronic disease, the optimum mix of exercise frequency and exercise duration on select outcome measures for a given exercise intensity, is unclear
While an exercise dose can be prescribed in terms of frequency, duration, intensity and mode of exercise only recently have the exercise dose-response relationships become systematically examined and for those persons with chronic diseases and metabolic syndrome [1,2,3,4,5,6,7]
There was no time course analysis for the reported significant cardiorespiratory changes or for the significant changes associated with metabolic syndrome
Summary
In healthy women, aged 65-74 years, with no history of chronic disease, the optimum mix of exercise frequency and exercise duration on select outcome measures for a given exercise intensity, is unclear. Unclear is the time course for those select outcome measures and when exercise frequency and duration are varied. While an exercise dose can be prescribed in terms of frequency, duration, intensity and mode of exercise (continuous or intermittent) only recently have the exercise dose-response relationships become systematically examined and for those persons with chronic diseases and metabolic syndrome [1,2,3,4,5,6,7]. Methods: Forty-six women aged 65-74 years were randomly assigned to 2 or 4 sessions.wk-1) for six weeks
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