Actively Recruiting

Phase 2
Age: 50Years +
All Genders
ID06811324

The Effects of Tirzepatide on Muscle and Vascular Function in Obese Older Adults

Led by The University of Texas Health Science Center at San Antonio · Updated on 2026-04-15

20

Participants Needed

1

Research Sites

8 weeks

Total Duration

On this page

AI-Summary

What this Trial Is About

This research aims to study the effects of tirzepatide, a new medication approved for type 2 diabetes and obesity, on muscle mass and function in older adults with obesity. The study focuses on people aged 50 and older, especially since weight loss from tirzepatide might include loss of muscle, which can cause weakness and frailty. The study is a pilot, single-arm, open-label trial conducted in South Texas, where obesity and related diseases are common among aging adults. Participants will self-administer tirzepatide once a week by injection, starting at 2.5 mg with dose increases monthly up to 10 mg or the highest tolerated dose. The treatment period lasts for 6 months. The trial evaluates how tirzepatide affects muscle mass, strength, and vascular health during this time. During the study, participants will undergo assessments of muscle mass, muscle strength, and lower extremity function at the start and after 6 months of treatment. Researchers will monitor changes in these outcomes to understand the impact of tirzepatide on muscle and vascular health. Participants are expected to comply with fasting and other study procedures, and the total duration of involvement is 6 months.

CONDITIONS

Brief Title

Effects of Tirzepatide on Muscle and Vascular Health in Obese Older Adults

Who Can Participate

Age: 50Years +
All Genders

Eligibility Criteria

Eligible

You may qualify if you...

  • Men and postmenopausal women aged 50 years or older
  • Body Mass Index (BMI) of 30 kg/m² or higher
  • Untreated hemoglobin A1c less than 6.5% at baseline
  • Willingness and ability to follow all study procedures, including fasting when required
  • Able to give informed consent and participate in all study assessments
Not Eligible

You will not qualify if you...

  • Active type 2 diabetes mellitus or use of glucose-lowering medications
  • Body Mass Index (BMI) of 40 kg/m² or higher
  • Moderate to severe gastroesophageal reflux disease
  • Unable to comply with treatment protocol or understand consent
  • Chronic Kidney Disease Stage 4
  • Elevated liver enzymes (AST > 33 U/L or ALT > 36 U/L)
  • Active pregnancy
  • Personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2 syndrome
  • Personal history of gastroparesis or diabetic retinopathy
  • Known serious allergy to tirzepatide or GLP-1 receptor agonists
  • Current treatment with GLP-1 receptor agonist therapy

AI-Screening

AI-Powered Screening

Complete this quick 3-step screening to check your eligibility

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Your Study Journey

Screening

Duration - 2 to 4 weeks

Participants are screened for eligibility to participate in the trial.

1 visit (in-person)

Treatment

Duration - 6 months

Participants receive weekly self-administered injections of Tirzepatide with dose escalation monthly up to a target dose or maximum tolerated dose.

Weekly visits for 6 months

Trial Site Locations

Total: 1 location

1

University of Texas Health Science Center at San Antonio

San Antonio, Texas, United States, 78229

Actively Recruiting

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Research Team

S

Suha Soni

How is the study designed?

Study Type

INTERVENTIONAL

Masking

NONE

Allocation

NA

Model

SINGLE_GROUP

Primary Purpose

OTHER

Number of Arms

1

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Published Research Related To This Trial

GLP-1 Receptor Agonists for the Reduction of Atherosclerotic Cardiovascular Risk in Patients With Type 2 Diabetes.

Nikolaus Marx, Mansoor Husain, Michael Lehrke...

https://pubmed.ncbi.nlm.nih.gov/36508493

The age-related loss of skeletal muscle mass and function: Measurement and physiology of muscle fibre atrophy and muscle fibre loss in humans.

D J Wilkinson, M Piasecki, P J Atherton

https://pubmed.ncbi.nlm.nih.gov/30048806

Tirzepatide after intensive lifestyle intervention in adults with overweight or obesity: the SURMOUNT-3 phase 3 trial.

Thomas A Wadden, Ariana M Chao, Sriram Machineni...

https://pubmed.ncbi.nlm.nih.gov/37840095

Prevalence of Cardiometabolic Diseases Among Racial and Ethnic Subgroups in Adults - Behavioral Risk Factor Surveillance System, United States, 2013-2021.

Alain K Koyama, Kai McKeever Bullard, Fang Xu...

https://pubmed.ncbi.nlm.nih.gov/38271277