Insulin sensitivity in joggers: evaluation by mini-dose insulin infusion test

Area of Science:

• Metabolism and Endocrinology
• Exercise Physiology

Background:

• Insulin resistance is a key factor in metabolic disorders.
• Physical activity is known to influence insulin sensitivity.

Purpose of the Study:

• To evaluate insulin sensitivity in joggers using a mini-dose insulin infusion test.
• To compare insulin sensitivity between joggers and healthy non-joggers.

Main Methods:

• A mini-dose insulin infusion test was administered to seven joggers.
• Results were compared to 22 healthy non-joggers matched for body weight.
• Insulin sensitivity index was calculated based on glucose decline and insulin increase.

Main Results:

• Joggers showed a significantly higher insulin sensitivity index (0.098 +/- 0.009) compared to controls (0.057 +/- 0.005).
• While glucose decline was similar, joggers had a smaller incremental rise in steady-state insulin levels, suggesting increased insulin turnover.
• The mini-dose insulin infusion test proved effective in differentiating insulin sensitivity.

Conclusions:

• Regular jogging enhances overall insulin sensitivity.
• The mini-dose insulin infusion test is a practical method for assessing training-induced changes in insulin sensitivity.