Incretin-Based Weight Loss Pharmacotherapy: Can Resistance Exercise Optimize Changes in Body Composition?

Purpose of the review?

Evaluate whether resistance exercise can optimize body composition during incretin-based weight-loss pharmacotherapy.

Why did the authors perform this review?

Incretin medications cause substantial weight loss but also significant lean body mass loss.

What concern prompted this review?

Loss of skeletal muscle during pharmacologic weight loss.

What did the authors want to determine?

Whether resistance exercise can preserve muscle while maintaining weight-loss benefits.

Primary clinical question?

Can resistance exercise reduce lean mass loss associated with incretin-based medications?

What body composition change is the review focused on?

Preserving lean mass while maximizing fat loss.

What medications are discussed in the review?

Incretin-based weight-loss medications (GLP-1 receptor agonists and dual/triple incretin agonists).

Examples of GLP-1 receptor agonists?

Semaglutide and liraglutide.

Examples of newer incretin medications?

Tirzepatide and retatrutide.

What is the major benefit of incretin medications?

Significant weight loss and improved cardiometabolic health.

What is the major drawback of incretin medications?

Significant loss of lean body mass.

Why is lean mass important?

Maintains strength, metabolism, mobility, balance, and independence.

What happens if excessive lean mass is lost?

Increased risk of sarcopenia, frailty, weakness, and functional decline.

What exercise intervention do the authors recommend?

Progressive resistance training.

Why is resistance training recommended?

It stimulates muscle protein synthesis and preserves lean mass.

How does resistance training affect strength?

Increases muscle strength and functional performance.

How does resistance training affect body composition?

Helps maintain muscle while promoting greater fat loss.

How does resistance training improve long-term outcomes?

Improves long-term weight maintenance and reduces functional decline.

Main conclusion of the review?

Resistance training should accompany incretin-based pharmacotherapy to preserve muscle and optimize body composition.

What is the authors’ overall recommendation?

Combine incretin medications with progressive resistance exercise rather than medication alone.

What is the biggest clinical implication?

Weight loss should prioritize preserving muscle, not just reducing body weight.

What is the PT implication?

Prescribe progressive resistance training early for patients taking incretin-based weight-loss medications.

What is the take-home message?

Incretin medications are most effective when paired with resistance exercise to maximize fat loss and preserve muscle.

Why is this article important for PTs?

PTs play a key role in preventing muscle loss and maintaining function during pharmacologic weight loss.