Key result
Athletes with type I diabetes and HbA1c <7% achieved greater peak exercise VO2, workload, heart rate, stroke volume, and cardiac output compared to those with HbA1c >7% (P<0.05).
Why the study?
Does glycemic control affect cardiopulmonary exercise responses in highly trained athletes with type I diabetes?
Does glycemic control affect cardiopulmonary exercise responses in highly trained athletes with type I diabetes?
Poor glycemic control impairs cardiopulmonary exercise responses in highly trained athletes with type I diabetes, whereas those with good control achieve responses similar to athletes without diabetes.
Glycemic optimization may aid exercise capacity in T1D athletes; hypothesis-generating and should not yet change practice.
PURPOSE: This study aimed to (a) examine the influence of type I diabetes on the cardiopulmonary exercise response in trained subjects and (b) determine whether glycemic control affects these responses. METHODS: The cardiopulmonary responses to maximal incremental cycle ergometry were compared in 12 Ironman triathletes with type I diabetes and 10 age- and sex-matched control subjects without diabetes. Athletes with type I diabetes were then stratified into low- (glycosylated hemoglobin (HbA1c) < 7%, n = 5) and high-HbA1c (HbA1c > 7%, n = 7) groups for comparison. Cardiac output, stroke volume, arterial blood pressure, and calculated systemic vascular resistance along with airway function were measured at rest and during steady-state exercise. RESULTS: During peak exercise HR, stroke volume and cardiac output were not different between the groups with and without diabetes; however, forced expiratory flow at 50% of the forced vital capacity was lower in subjects with diabetes (P < 0.05). Within the group with diabetes, HbA1c was lower in the low-HbA1c versus high-HbA1c group (6.5 +/- 0.3 vs 7.8 +/- 0.4, respectively; P < 0.05), but training volume was not different. At rest, the low-HbA1c group had greater cardiac output and lower systemic vascular resistance than the high-HbA1c group, and all pulmonary function measurements were greater in the low-HbA1c group (P < 0.05). During peak exercise, the VO2, workload, HR, stroke volume, and cardiac output were greater in the low-HbA1c versus the high-HbA1c group (P < 0.05). In addition, all indices of pulmonary function were higher in the low-HbA1c group (P < 0.05). Finally, within the subjects with diabetes, there was a weak inverse correlation between HbA1c and exercise training volume (r2 = -0.352) and stroke volume (r2 = -0.339). These data suggest that highly trained individuals with type I diabetes can achieve the same cardiopulmonary exercise responses as trained subjects without diabetes, but these responses are reduced by poor glycemic control.
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Baldi et al. (2010) studied this question. Athletes with type I diabetes and HbA1c <7% achieved greater peak exercise VO2, workload, heart rate, stroke volume, and cardiac output compared to those with HbA1c >7% (P<0.05).
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