Abstract
PURPOSE: Patients with type 2 diabetes normally display higher baseline sympathetic activity compared to normal people. Exercise training is recommended for normalization of glycemic control for normal people and type 2 diabetes patients. However, insulin sensitivity could be affected by situational sympathetic modulation. To determine the time effect of 90-min swimming (∼3000 M) on insulin sensitivity and its relation to heart rate variability (HRV). METHODS: Eight adolescent swimmers enrolled in this study. All participants were swam at pool temperature of 26 degree C under overnight fasting condition. HRV,blood glucose and insulin concentrations were measured 1 h and 24 h after swimming. RESULTS: The results showed that glucose and insulin levels were not significantly altered. HOMA-IR was significantly decreased from 1.81±0.43 to 0.86±0.10 (P< 0.05). HF power was not altered from 1 h until 24 h after exercise, whereas the LF/HF was significantly lowered from 1.08±0.05 to 0.53±0.24 (P<0.05). CONCLUSIONS: Insulin sensitivity was significantly lowered 24 h after prolonged swimming compared to 1 h value,and this decrease appears to be associated with reduced sympathetic activity.
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