Endocrinological Support Therapy After Military Operations
Intense physical stress, such as military field operations, can leave the body completely drained of energy, muscle power, and natural hormones. This trial investigates whether a hormone injection can help healthy men recover more quickly after heavy physical exertion. Researchers are testing Nebido, a long-acting form of testosterone, against an inactive salt water (saline) injection. Participants will receive one of these treatments after completing demanding military activities. The study team will track how quickly their bodies bounce back by measuring leg power, grip strength, pull-ups, and cycling sprints. They will also look at body composition, hormone levels in blood tests, and mental focus. The goal is to understand if temporary hormone therapy can safely protect muscle mass, restore physical performance, and sharpen mental alertness after severe physical strain.
At a glance
What is this study about?
When people push their bodies through extreme physical stress—such as continuous military exercises or heavy operational training—their muscles break down, energy stores empty out, and natural hormone levels drop sharply. This deep physical exhaustion can lead to prolonged weakness, fatigue, and slower reaction times, which can take weeks or even months to fully heal.
This study is looking at whether temporary hormone therapy can help speed up this natural recovery process. Specifically, the researchers want to see if an injection of Nebido (a medical form of testosterone) helps restore strength and energy faster than the body could manage on its own, compared to a harmless dummy injection made of salt water.
During the trial, researchers will measure several key areas of recovery. They will test explosive muscle power using jumping and leg-press exercises, assess endurance through pull-ups and intense cycling tests, and check mental sharpness using quick reaction puzzles. They will also run regular blood tests to check how hormone levels recover over time.
While this study focuses on military operations, understanding how the body recovers from severe physical exhaustion could offer valuable insights for medicine in the future. It could help researchers learn more about helping people bounce back from severe illness, major surgery, or extreme physical trauma where muscle loss is a serious concern.
Key takeaways
- The study tests whether a hormone injection helps healthy men recover faster after extreme physical exhaustion.
- Participants will receive either the hormone Nebido (testosterone) or a plain salt water dummy injection.
- Recovery will be tracked through leg power, grip strength, cycling tests, blood samples, and mental focus tasks.
- Only healthy men aged 18 and older who have taken part in military exercises can join.
- Taking part is completely voluntary, and participants can leave the study at any time.
Who may be eligible?
This trial is open to healthy adult men aged 18 and older. Because the study focuses on how bodies recover from severe physical strain, participants do not need to have any illness or long-term medical condition to take part.
Only men are being recruited for this specific trial. This is because the study involves testosterone treatment and focuses on male hormone balance after strenuous military work.
To be considered, individuals must be fit enough to take part in intense physical fitness tests, such as sprinting on an exercise bike, jumping, and lifting weights. The research team will review each person's general health before they can join to make sure it is safe for them 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 a man aged 18 or older?
- Are you in generally good health with no major medical conditions?
- Are you currently serving in or taking part in strenuous military operations?
- Are you able and willing to perform intense physical fitness and strength tests?
- Are you comfortable receiving an injection and having routine blood tests?
What does participation involve?
If you take part in this study, you will first undergo a health check to make sure you are fit to participate. Following an intense military operational exercise, you will be randomly assigned to receive either an injection of Nebido (testosterone) or an inactive salt water injection (placebo).
Over the course of the study, you will attend several assessment sessions. During these visits, researchers will test your physical fitness using jumps on special pressure plates, leg presses, medicine ball throws, pull-ups, and short cycling sprints. You will also complete simple computer-based puzzles to measure your reaction time, attention, and mental processing speed.
The team will take small blood samples to check hormone levels such as testosterone and cortisol, and use body scanning scales to track changes in muscle and body fat. You will also fill out questionnaires about how recovered and energetic you feel. The study team will explain the exact schedule and total number of weeks you will need to attend before you agree to join.
Potential risks and benefits
Locations (1)
- —UnverifiedNorway
Common questions
What is Nebido?
Nebido is a long-acting prescription medicine that contains testosterone, a hormone naturally produced in the body that supports muscle growth, bone health, and energy levels.
Will I know which injection I am getting?
No. In this type of trial, neither you nor the doctors usually know whether you are receiving Nebido or the inactive salt water injection, which keeps the test results completely fair and unbiased.
Are the fitness tests dangerous?
The physical tests—such as jumping, leg presses, and cycling—are very demanding and will push you to your limits, but they are carried out under the supervision of trained fitness and medical experts.
Do I have to pay to take part?
No. You will not have to pay for the study medication, health checks, or fitness assessments involved in the research.
Can I stop taking part if I change my mind?
Yes. You have the right to withdraw from the trial at any point, for any reason, without it affecting your regular medical care or career.
How to find out more
Always speak to your GP or specialist before deciding to take part in a study.
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