Abstract 13156: Life-long Training Volume Alters the Hemodynamic Response during Maximal Exercise in Healthy Older Adults.
Purpose: While previous studies have shown that maximal oxygen uptake (VO2max) is increased with exercise training in healthy older adults (>60 years), the effect of training volume (number of sessions/wk) over a life-time on maximal exercise hemodynamics has not been clearly elucidated.
Hypothesis: VO2max will be increased with training volume, which in turn will be associated with a larger maximum stroke volume.
Methods: VO2max, maximum cardiac output (C2H2 rebreathing) during treadmill or cycle exercise, and body composition (underwater weighting) was collected in 91 healthy trained and untrained older individuals. These included 27 untrained subjects who had consistently (>20 years) performed <2 sessions/wk (Q1), 16 subjects who performed 2–3 sessions/wk (Q2), 23 subjects who performed 4–5 sessions/wk (Q3) and 25 Masters Athletes who performed 6 or more sessions/wk plus regular competitors (Q4).
Results: Irrespective of scaling unit, VO2max increased with training volume. Maximum cardiac output (Qc) was greater in Quad 4 compared to the other 3 groups (Table 1). Similarly, cardiac power and peak stroke volume was greater in Quad 4 compared to the other groups, and these differences remained when indexed to levels of lean body mass (LBM) (all p< 0.001). Systemic arterio-venous oxygen difference (A-VO2diff) was greater in Quad 3 (16.9 ± 2.5 ml/100ml) and Quad 2 (15.0 ± 2.5 ml/100ml) compared to Quad 1 (p< 0.001 and p= 0.07 respectively).
Conclusion: VO2max increased with life-time training volume; however this was only associated with a larger stroke volume in Masters Athletes, while an increased peripheral oxygen utilization seems more important for the increased VO2max in older adults who have performed lifelong training of 2–5 sessions/wk.
- © 2010 by American Heart Association, Inc.