Exercise Training Induced Cardioprotection with Moderate Hyperglycemia versus Sedentary Intensive Glycemic Control in...

Area of Science:

• Cardiovascular disease research
• Exercise physiology
• Diabetes mellitus management

Background:

• Intensive insulin therapy (IIT) is standard for type 1 diabetes mellitus (T1DM) to prevent cardiovascular disease (CVD), but can cause weight gain and insulin resistance.
• Conventional insulin therapy (CIT) with high-intensity aerobic training (AThigh) is used to prevent hypoglycemia during exercise.
• Resistance training (RT) may further mitigate hypoglycemia risk during exercise in T1DM.

Purpose of the Study:

• To compare the cardioprotective effects of CIT with AThigh against IIT in T1DM.
• To determine if combining RT with AThigh (ART) offers similar cardioprotection as AThigh alone.

Main Methods:

• Diabetic male Sprague-Dawley rats (n=44) with streptozotocin-induced T1DM were divided into D-IIT, D-CIT, D-AThigh, D-RT, and D-ART groups.
• Blood glucose was managed with insulin. Exercise protocols included treadmill running (AThigh), weighted ladder climbs (RT), and alternating daily (ART) for 12 weeks.
• Cardioprotection was assessed via ischemia-reperfusion (I-R) injury.

Main Results:

• Cardioprotection against I-R injury was comparable between the D-AThigh and D-IIT groups.
• High-intensity aerobic training (AThigh) in T1DM led to improved glycemia.
• Resistance exercise (RT) in T1DM enhanced insulin sensitivity.

Conclusions:

• Exercise, including AThigh, is a viable strategy for achieving cardioprotection in T1DM patients.
• Both AThigh and IIT provide cardioprotection, with unique benefits for glycemia and insulin sensitivity, respectively.
• Exercise programming for T1DM should consider factors beyond glycemic control for optimal outcomes.