New Findings What is the central question of this study?We compared high‐intensity interval versus continuous training on fasting and postprandial arterial stiffness in people with prediabetes. What is the main finding and its importance?We show, for the first time, that exercise improves the augmentation index during the postprandial state, but not the fasted state, in adults with prediabetes. However, the fasted augmentation index improved in relationship to exercise dose, as assessed by kilocalories per session. Collectively, these findings suggest that short‐term exercise can improve arterial compliance in adults with prediabetes. Therefore, lifestyle interventions designed to reduce arterial stiffness could have considerable clinical impact. Abstract People with prediabetes have elevated risk for cardiovascular disease, in part, owing to arterial stiffness mediated by low insulin sensitivity. However, the effect the intensity and/or amount (i.e. kilocalories per session) of short‐term exercise training on fasting and postprandial arterial stiffness is unknown. We tested the hypothesis that increased intensity and dose (i.e. amount) of exercise would be correlated with reduced fasting and postprandial arterial stiffness in obese adults with prediabetes. After randomization, 31 adults (age 61.4 ± 8.3 years, body mass index 32.1 ± 5.4 kg m−2) with prediabetes performed supervised continuous (CONT; n = 17; 70% of peak heart rate) or interval (INT; n = 14; 3 min at 50% of peak heart rate and 3 min at 90% of peak heart rate) cycling training for 60 min day−1 over 2 weeks. The amount of exercise was calculated using regression equations derived from oxygen uptake (V̇normalO2) and heart rate. Arterial stiffness [augmentation index (AI) and cartoid–femoral pulse wave velocity], insulin and glucose were determined during a 180 min 75 g oral glucose tolerance test (OGTT) and analysed by the total area under the curve (tAUC) pre‐ versus post‐training. The simple index of insulin sensitivity, (SIIS)OGTT, was calculated; aerobic fitness (peak V̇normalO2) and body mass were also assessed. Short‐term training had no effect on weight but did improve peak V̇normalO2 (P = 0.003), glucose tAUC180min (P = 0.01) and insulin sensitivity (P = 0.002), independent of intensity. The CONT and INT exercise significantly reduced AI 2 h postprandial (P = 0.008) and tAUC180min (P = 0.03). Reductions in fasted AI were related to exercise dose (trend: r = −0.37, P = 0.055). Increased peak V̇normalO2 was linked to reduced fasted (r = −0.47, P = 0.01) and tAUC180min AI (r = −0.39, P = 0.05). Decreased AI tAUC180min was correlated with increased insulin sensitivity (r = −0.50, P = 0.009). Short‐term CONT and INT training reduced postprandial arterial stiffness comparably in adults with prediabetes.
Objective: Examine the effect of aerobic exercise (EX) combined with standard medical care (SC) (EX + SC) compared to SC alone on cardiometabolic health and quality of life in relation to surgical outcomes.
We evaluated the effect of preoperative standard medical care (SC) vs. unsupervised aerobic exercise combined with SC (EX + SC) on cardiometabolic health and quality of life (QoL) 30 days after bariatric surgery. Bariatric patients (n = 14, age: 42.3 ± 2.5 years, body mass index: 45.1 ± 2.5 kg/m2) were match‐paired to presurgical SC (n = 7) or EX + SC (n = 7; walking 30 min/day, 5 day/week, 65–85% HRpeak) for 30 days. Body composition, peak cardiorespiratory fitness (VO2peak), QoL, inflammation (adiponectin, leptin, cytokeratin‐18), and a 120 min mixed meal tolerance test was performed to assess aortic waveforms (augmentation index, AIx@75), insulin sensitivity, and glucose total area under the curve (tAUC) at the time of surgery (post‐intervention) and 30 days post‐surgery. EX + SC had significantly higher high molecular weight (HMW) adiponectin (p = 0.01) and ratio of HMW to total adiponectin (p = 0.04) than SC at 30 days post‐surgery, although they significantly (p = 0.006; ES = 1.86) decreased total time spent in moderate to vigorous physical activity (MVPA). SC had a significantly greater increase in VO2peak (p = 0.02; ES = 1.54) and decrease in 120 min AIx@75 (p = 0.02; ES = 1.78) than EX + SC during the post‐surgical period. The increase in MVPA was associated with a reduction in cytokeratin‐18 (r = −0.67, p = 0.02). Increased VO2peak was associated with increased activity/mobility QoL domain (r = 0.52, p = 0.05) and decreased 120 min AIx@75 (r = −0.61, p = 0.03) from surgery to post‐surgery. Preoperative EX + SC did not maintain more favorable cardiometabolic health 30 days post‐operation in this pilot study. However, changes in MVPA appear important for QoL and should be considered in future work.
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