Does human skeletal muscle possess an epigenetic memory of testosterone
This study is investigating whether our muscles have a 'memory' for testosterone. Researchers are interested in how this might relate to problems like muscle weakness associated with ageing, called sarcopenia, where muscles don't respond as well to signals for growth. They are giving some men testosterone injections and others a dummy injection (placebo), with some also doing resistance training (like lifting weights). The goal is to see if testosterone, with or without exercise, helps build or maintain muscle size and strength. The study also looks at changes within the muscle cells themselves to understand the long-term effects of testosterone on muscle 'memory'.
At a glance
What is this study about?
This research is looking into an interesting idea called 'epigenetic memory' in our muscles, specifically how it relates to testosterone. Epigenetics is like a set of instructions that tells our genes what to do, without changing the genes themselves. The study wants to find out if muscles remember past exposure to testosterone, which could be important for how they grow and stay strong. This 'memory' might explain why some people build muscle more easily than others, or why muscles might decline with age, a condition called sarcopenia.
The researchers are studying healthy ageing and sarcopenia because as we get older, our muscles often become weaker and smaller, and they don't respond as well to exercise or protein – this is sometimes called 'anabolic resistance'. Understanding if testosterone leaves a lasting mark or 'memory' in our muscles could help find new ways to keep muscles healthy as we age.
To do this, they are giving some participants a testosterone injection (Nebido) and others a harmless salt water injection (placebo). Some people in both groups will also do resistance exercise, like weight training. They will then measure things like muscle size, strength, and look closely at muscle cells to see if there are any changes in the genetic instructions or fibres. This will help them understand how testosterone, with or without exercise, affects muscle growth and if these effects leave a lasting ‘memory’ in the muscle.
Key takeaways
- The study explores if muscles 'remember' testosterone exposure.
- It aims to understand muscle changes in healthy ageing and weakness (sarcopenia).
- Participants will receive either testosterone or a dummy injection.
- Some participants will also engage in resistance training.
- Measurements include muscle size, strength, and detailed muscle cell analysis.
Who may be eligible?
To take part in this study, you need to be an adult man, aged 18 years or older. There is no upper age limit, so older men are also able to join.
This study is looking for generally healthy individuals, but it's specifically interested in how muscles respond to testosterone, particularly in the context of ageing. You would need to be able to safely receive the study medication and participate in resistance training if assigned to that group.
Your doctor would discuss all criteria with you to make sure it's safe and appropriate for you to participate.
Could this study suit you?
Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.
- Are you an adult man, 18 years or older?
- Are you generally healthy and able to participate in physical assessments?
- Are you able to potentially receive injections?
- Are you able to participate in resistance training if required?
- Do you want to contribute to research on muscle health and ageing?
What does participation involve?
If you decide to take part, you would receive either a testosterone injection or a dummy injection. Some participants will also be asked to do resistance training, which involves exercises like lifting weights. The study will measure your body composition, including fat-free mass, using a special scan called a DEXA. Researchers will also use ultrasound to measure your muscle size. You might also have small muscle samples (biopsies) taken from your leg to look closely at the muscle fibres and cells. Your strength, speed, and power will be assessed using specific exercise machines. There will be several visits to the study clinic over a period of time to complete these assessments. The exact number of visits and the full duration of your participation will be fully explained to you before you agree to join.
Potential risks and benefits
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Common questions
What is 'epigenetic memory'?
It's like your muscle cells remember experiences, such as being exposed to testosterone, which can affect how your genes work without changing the genes themselves.
What is sarcopenia?
Sarcopenia is the natural loss of muscle mass, strength, and function that can happen as people get older.
Will I definitely get testosterone in this study?
No, you might receive a dummy injection (placebo) instead. This helps researchers compare the effects fairly.
Will I have to do exercise?
Some participants will be asked to do resistance training, like weightlifting, as part of the study, while others will not.
How long will the study last for me?
The exact duration of your participation will be clearly explained by the study team, but it will involve several visits over a period of time.
How to find out more
Always speak to your GP or specialist before deciding to take part in a study.
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