Abstract 18439: Improved Physical Capacity but Unaltered Left Ventricular Mass and Function at Rest Following a 12-Week Indoor Cycling Intervention in Previously Sedentary Women
Introduction: The amount of physical training needed to elicit effects on cardiac dimensions and function in previously sedentary subjects has not been well established, depending on i.a. that longitudinal studies are lacking. We aimed to investigate effects of regular indoor cycling on cardiac function and dimensions in previously sedentary females
Methods: Fourty-two healthy females without regular participation in aerobic exercise within the past year were equally divided into an exercise (EX) and a control (CON) group. During 12 weeks, EX completed 2.6 (1.8-4.1) regular indoor cycling classes per week, each 45 to 60 minutes, at a local gym. Before and after the intervention, subjects were examined with echocardiography and a maximal bicycle exercise test.
Results: There were no baseline differences between EX and CON groups in age (34±7 vs. 35±6 yrs, p=0.618), bodyweight (71±11 vs. 66±13 kg, p=0.151) or body surface area (BSA, 1.80±0.13 vs. 1.73±0.17 m2, p=0.150). There were no statistically significant changes in bodyweight or BSA in either group over the 12 weeks. After the intervention, higher exercise capacity and lower heart rate at rest and on a standardized submaximal work load were seen in the EX group, while unchanged in the CON group (Figure 1, table). At baseline, there were no differences in cardiac dimensions or function between groups. No measure of systolic or diastolic function did change following training in the EX group, and BSA-indexed LV mass remained unchanged (Figure 1). Minimal, but statistically significant differences following training were seen in LV internal diameter in diastole (+3%, p=0.001) and in systole (+5%, p=0.001).
Conclusions: Participation in regular indoor cycling classes 2-3 days a week for 12 weeks was feasible and sufficient to improve physical capacity. While minor differences in LV dimensions were seen following training, it did not elicit changes in LV mass or function.
Author Disclosures: K. Hedman: None. N. Bjarnegård: None. T. Länne: None.
- © 2016 by American Heart Association, Inc.