Insulin sensitivity after maximal and endurance resistance training

Area of Science:

• Endocrinology
• Metabolic Health
• Exercise Physiology

Background:

• Overweight individuals at risk of type 2 diabetes often exhibit impaired glucose tolerance and insulin resistance.
• Lifestyle interventions, including exercise, are crucial for managing metabolic health and preventing diabetes progression.

Purpose of the Study:

• To compare the effects of maximal resistance training (MRT) versus endurance resistance training (ERT) on insulin levels and glucose tolerance.
• To evaluate the efficacy of two distinct resistance training modalities in a population at high risk for type 2 diabetes.

Main Methods:

• Eighteen participants with impaired glucose tolerance were randomized into either an MRT group or a control group.
• The MRT group underwent supervised training (5x3-4 reps, 60-85% 1RM) three times weekly for four months.
• Following a washout period, the control group transitioned to an ERT program (3x12-15 reps, 45-65% 1RM) for four months, with pre-intervention measurements serving as controls.

Main Results:

• Maximal resistance training (MRT) significantly reduced 2-hour glucose and fasting C-peptide levels, alongside decreased insulin resistance.
• Endurance resistance training (ERT) significantly lowered blood insulin levels and positively impacted insulin sensitivity and beta-cell function.
• Both training types demonstrated benefits, with MRT enhancing glucose uptake capacity and ERT improving insulin sensitivity.

Conclusions:

• Both MRT and ERT are effective primary intervention strategies for individuals at risk of developing type 2 diabetes.
• The choice between MRT and ERT may depend on specific metabolic goals, such as improving glucose uptake or insulin sensitivity.
• Resistance training, in general, plays a vital role in mitigating type 2 diabetes risk factors.