Masters Bodybuilding Over 40: How to Compete Well

Health checks before you start a prep

A contest prep is a long period of low energy intake, and it changes how your body works. Even in young, healthy competitors, the changes can be large:

• In a case study of a natural bodybuilder in his mid-20s (Rossow and colleagues, 2013, International Journal of Sports Physiology and Performance), resting heart rate fell from 53 to 27 beats a minute and blood pressure from 132/69 to 104/56 during prep. His testosterone fell to about a quarter of its starting level.
• In 27 female fitness competitors studied by Hulmi and colleagues (2017, Frontiers in Physiology), resting heart rate and systolic blood pressure fell during the diet and were still lower than at the start about four months after the show. Testosterone and thyroid hormone were still slightly low too.

After 40, more people have conditions or take medicines that interact with those changes. Before you start, see your doctor or GP, and tell them you are planning a long, hard diet, especially if you:

• have a heart condition, high blood pressure, diabetes, or kidney or liver problems;
• take any regular medicines, including for blood pressure, blood sugar, mood or hormones;
• have a history of disordered eating;
• have joint problems or an old injury that limits your training.

A baseline set of blood tests before prep, arranged and interpreted by your doctor, gives you something to compare against if you feel unwell later.

What changes in prep after 40

Recovery

You may feel you take longer to recover than you did at 25, but the research is less clear than you might expect. A 2023 scoping review by Hayes and colleagues (Sports Medicine - Open) found the studies on recovery from resistance exercise in older adults used very different methods and gave inconsistent results, with little data on women.

What we do know is that some choices make recovery harder at any age. In a 2017 study by Morán-Navarro and colleagues (European Journal of Applied Physiology), taking every set to failure slowed recovery by up to 24 to 48 hours in trained men, compared with doing the same work while stopping short. On a diet, that cost is harder to pay. In prep:

• Stop most sets about 1 to 3 reps short of failure.
• Cut sets before you cut weight when recovery starts to slide.
• Keep hard cardio to a minimum. A 2015 review of contest prep training by Helms and colleagues (Journal of Sports Medicine and Physical Fitness) recommends using the lowest frequency and duration of cardio that still lets you lose fat, because more cardio interferes more with strength training. Daily steps are easier to recover from.
• Protect your sleep. The American Academy of Sleep Medicine and the Sleep Research Society recommend 7 or more hours a night for adults.

Joints

Late in prep, low calories and heavy weights can make old aches louder. Choose exercises that let you train hard without pain: machines, dumbbells and neutral grips often help. The NHS describes exercise, including strengthening exercise, as one of the most important treatments for osteoarthritis, but sharp or worsening pain is a reason to stop that exercise and get it checked by a doctor or physiotherapist.

Hormones

The NHS says testosterone levels in men fall by about 1% a year from around the age of 30 to 40, which is unlikely to cause problems in itself, and that menopause usually happens between 45 and 55. Prep itself pushes hormones down further, as the studies above show. For women past the menopause, missed periods are no longer a warning sign, so watch for other signs that the diet has gone too far: dizziness, poor sleep, low mood, and training falling apart. Hormone treatment is a decision for you and your doctor, not for your coach or the gym.

Muscle and protein

A 2018 meta-analysis by Morton and colleagues (British Journal of Sports Medicine) found that the benefit of extra protein for building muscle got smaller with age, so getting enough matters more, not less. For lean lifters dieting for a show, a 2014 review by Helms, Aragon and Fitschen (Journal of the International Society of Sports Nutrition) suggests about 2.3 to 3.1 g of protein per kg of lean body mass a day. That is higher than the 1.6 to 2.2 g per kg of body weight this site suggests for most people, because it is worked out from lean mass and aimed at very lean dieters, who risk losing the most muscle. Spread it across your meals. Building muscle after 40 covers training and protein in the off-season.

Give yourself more time

The 2014 Helms review recommends losing about 0.5 to 1% of body weight a week to hold on to as much muscle as possible. In the Chappell study of 51 natural bodybuilders at a UK final, prep lasted 22 weeks on average, give or take 9. After 40, with work, family and joints to look after, aim for the longer end and the slower rate, and add 2 to 4 spare weeks for stalls, illness and life. The free contest prep calculator works out your start date from your show date.

Starting early means you can diet steadily rather than crash at the end, when muscle loss and fatigue are highest.

Peak week: keep it simple

The research behind dramatic peak week tricks is thin. When Mitchell and colleagues (2017, Sports) interviewed seven experienced natural bodybuilders, aged 22 to 65, loading and then cutting water came up in every interview, and it had not worked well enough for those who tried it to keep doing it. The three who had tried salt tricks found them inconsistent and stopped. The 2014 Helms review warns that dehydration can be dangerous.

That matters more over 40. If you take medicines for blood pressure or heart conditions, or anything that affects your fluid balance, do not change your water or salt intake for a show without your doctor's agreement. Diuretics are banned in drug-tested competition and are on the World Anti-Doping Agency's Prohibited List, as of October 2026. If your doctor has prescribed a diuretic, for blood pressure for example, keep taking it as prescribed, raise any questions with your doctor, and ask your federation about medical exemptions. The safest peak week changes as little as possible.

After the show

Recovery after a prep is measured in months, not days. In the Hulmi study, some hormones were still slightly low about four months after the show, and in the Rossow case study strength had not fully returned after six. Plan to bring calories back up straight after the show, and give yourself a proper off-season before the next one. Post-show recovery covers how.

How coaching helps masters competitors

Prep after 40 has to fit around a career, a family and older joints, and it has to be safe as well as effective. With one-to-one contest prep coaching from CoachAk, your training program is written around your schedule, experience, equipment and injury history, with sets, reps, effort targets and coaching cues for every exercise, and you can send form-check videos for feedback. Your calorie, macro, step and cardio targets live in a private app and are updated as your body responds. The weekly check-in takes about three minutes and covers your weight, training and nutrition adherence, steps, sleep, energy, hunger, stress and digestion, with optional body measurements and progress photos. CoachAk replies with written feedback on what changes next week and why, and you can message your coach directly, with photos and voice notes. Medical decisions stay with your doctor.

If you are planning to compete as a masters athlete, apply for coaching.