Abstract P140: Change in Cardiorespiratory Fitness in Response to Exercise is Not Required to Observe Improvement in Cardiometabolic Risk Factors in Older Adults
The heterogeneity of response in cardiorespiratory fitness (CRF) to a standardized exercise program is well established and it is often reported that about 10% of the participants will not improve CRF (VO2 peak), the so-called `non-responders` to exercise. In this study we explored whether non-responders with respect to CRF experience health benefit through improvement in cardiometabolic risk factors. The sample included 60 sedentary, obese older (67.1 ± 5.7yr) adults who participated in 6 months of supervised resistance and aerobic exercise (RAE) combined (N= 32) or aerobic exercise (AE) alone (N=28). AE participants exercised 5 days per week for 30 minutes each session. The RAE group performed aerobic exercise 3 days per week and resistance exercise 2 days per week. CRF was measured using a standard treadmill test. Cardiometabolic risk factors measured included fasting triglycerides, total cholesterol, HDL-C, LDL-C, insulin, glucose, systolic and diastolic blood pressure. Mean attendance at the exercise sessions was 93±5% and did not vary by sex or group. Aerobic exercise intensity did not differ between the AE and RAE groups (mean exercise heart rate was 82% of the predicted maximum in both groups). Because the improvement in CRF was not different between groups (P>0.05) data were collapsed across group. The mean increase in CRF was 0.2 ±0.3 L/min. However, for 11 participants CRF did not change (e.g., change in CRF was ≤ 0). The volume (26,034kcal) and intensity (82%maxHR) of exercise performed in non-responders was not different from responders(25,714kcal, 82%maxHR) Despite the absence of change in CRF, significant (P<0.05) reductions in WC (4.3±3.5 cm) and VAT (0.5±0.5 kg) were observed. Further, the improvement in cardiometabolic risk factors in non-responders was not different when compared to responders in all cases except DBP (p<0.001). These observations reinforce the importance of exercise combined with a healthful diet and demonstrate that adopting these behaviors is associated with marked improvement in cardiometabolic risk profile despite the absence of change in CRF in older adults.
- © 2013 by American Heart Association, Inc.