Functional high-intensity training improves pancreatic β-cell function in adults with type 2 diabetes

Area of Science:

• Endocrinology
• Exercise Physiology
• Metabolic Diseases

Background:

• Type 2 diabetes (T2D) is marked by impaired pancreatic beta-cell function and insulin resistance.
• While aerobic exercise can improve beta-cell function, some T2D patients exhibit 'exercise resistance'.
• Alternative exercise modalities require investigation for their effects on beta-cell function in T2D.

Purpose of the Study:

• To evaluate the impact of a novel 6-week CrossFit functional high-intensity training (F-HIT) intervention on pancreatic beta-cell function.
• To assess changes in insulin secretion, insulin processing efficiency, and body composition in sedentary adults with T2D.

Main Methods:

• Twelve sedentary adults with T2D participated in a 6-week supervised F-HIT program, training 3 days/week.
• The intervention involved functional movements performed at high intensity in varied 10- to 20-minute sessions.
• Oral glucose tolerance tests and anthropometric measurements were conducted pre- and post-intervention.

Main Results:

• The mean disposition index, a measure of beta-cell function, significantly increased post-intervention (P=0.02).
• Fasting proinsulin-to-insulin ratio, indicating beta-cell processing inefficiency, was significantly reduced (P=0.04).
• Significant reductions in total body fat percentage (P=0.003) were observed, with preserved lean body mass.

Conclusions:

• Functional high-intensity training (F-HIT) is an effective exercise strategy for enhancing pancreatic beta-cell function in adults with T2D.
• Improvements in beta-cell function correlated with reductions in abdominal body fat and fasting alkaline phosphatase.
• F-HIT offers a viable alternative for improving metabolic health in T2D patients who may not respond optimally to traditional aerobic exercise.