Testosterone 'Muscle Memory' may help aging men stay stronger longer
NCT ID NCT05964920
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times
Summary
This study looked at whether giving older men testosterone for a few weeks, with or without resistance exercise, could create a lasting 'muscle memory' that makes it easier to regain muscle later. Forty-five sedentary men aged 55-70 received either testosterone or placebo injections, some also did supervised weight training. After a break, all men retrained to see if prior testosterone exposure boosted their results. The goal is to understand if a short hormone boost can have long-term benefits for muscle health in aging.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- Testosterone undecanoate (Nebido) injections
- What this could lead to
- If it works, this could point toward a way to help older men maintain muscle strength and function more easily after a short course of testosterone.
- What could go wrong
- This is a small, early-stage study (45 men) focused on understanding mechanisms, not proving a treatment. Results may not apply to women or younger people, and testosterone carries risks like hormonal side effects.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Norwegian School of Sport Sciences
Oslo, Oslo, 0863, Norway
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