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Relationship between exercise capacity and glucose tolerance in cystic fibrosis.
Pediatric Pulmonology 2018 Februrary
BACKGROUND: Improved exercise capacity (EC) and normal glucose tolerance (NGT) are independently associated with favorable outcomes in CF, however, little information on this relationship exists in patients with CF.
METHODS: Cardiopulmonary exercise tests, oral glucose tolerance tests (OGTT), and HbA1c values measured within a 12-month period were evaluated on 83 pediatric patients diagnosed with CF. Patients were categorized as having NGT, abnormal glucose tolerance (AGT), or CF-related diabetes (CFRD).
RESULTS: EC decreased as severity of glucose intolerance increased across NGT, AGT, and CFRD groups (P = 0.02). Compared to patients with NGT, patients with CFRD had lower peak VO2 mL/kg/min (33.0 ± 7.3 vs 41.3 ± 9.4, P = 0.01), lower VO2 % (81 ± 20 vs 93 ± 17, P = 0.03), and higher HbA1c (6.9 ± 1.7 vs 5.4 ± 0.4, P < 0.01). There was a positive association with age and FEV1 % with EC in the 17 patients with CFRD. In the 66 patients without diabetes, peak EC was positively associated with FEV1 % and negatively associated with age, fasting insulin, and insulin 120 min. After accounting for age and FEV1 %, multivariate analyses indicated that insulin and glucose values at 120 min predicted EC.
CONCLUSIONS: These data provide evidence that poor glucose tolerance is associated with lower EC in pediatric patients with CF. There was a significant relationship between glucose and insulin values obtained by OGTT with EC in a sample of non-diabetic patients with preserved lung function. Future studies are warranted to confirm these findings and investigate the potential role of exercise in the management or prevention of CFRD.
METHODS: Cardiopulmonary exercise tests, oral glucose tolerance tests (OGTT), and HbA1c values measured within a 12-month period were evaluated on 83 pediatric patients diagnosed with CF. Patients were categorized as having NGT, abnormal glucose tolerance (AGT), or CF-related diabetes (CFRD).
RESULTS: EC decreased as severity of glucose intolerance increased across NGT, AGT, and CFRD groups (P = 0.02). Compared to patients with NGT, patients with CFRD had lower peak VO2 mL/kg/min (33.0 ± 7.3 vs 41.3 ± 9.4, P = 0.01), lower VO2 % (81 ± 20 vs 93 ± 17, P = 0.03), and higher HbA1c (6.9 ± 1.7 vs 5.4 ± 0.4, P < 0.01). There was a positive association with age and FEV1 % with EC in the 17 patients with CFRD. In the 66 patients without diabetes, peak EC was positively associated with FEV1 % and negatively associated with age, fasting insulin, and insulin 120 min. After accounting for age and FEV1 %, multivariate analyses indicated that insulin and glucose values at 120 min predicted EC.
CONCLUSIONS: These data provide evidence that poor glucose tolerance is associated with lower EC in pediatric patients with CF. There was a significant relationship between glucose and insulin values obtained by OGTT with EC in a sample of non-diabetic patients with preserved lung function. Future studies are warranted to confirm these findings and investigate the potential role of exercise in the management or prevention of CFRD.
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