Creatine During Injury and Immobilisation

Nearly all creatine research examines what happens when you supplement and train. A smaller and more surprising literature looks at what happens when you can't.

The results are among the more interesting in the field.

What happens to muscle when you stop using it

Disuse atrophy is fast. Immobilisation — a cast, a brace, bed rest after surgery — produces measurable losses in muscle cross-sectional area and strength within days, with the greatest rate of loss early on.

The mechanisms include reduced muscle protein synthesis, increased breakdown, and neural changes affecting the ability to recruit the muscle.

For anyone recovering from an injury or an operation, that loss is the problem to be managed — and it's harder to reverse than to prevent.

The immobilisation research

Work by Hespel and colleagues examined creatine supplementation during a period of leg immobilisation followed by rehabilitation training.

The findings: creatine supplementation was associated with better preservation of muscle size during immobilisation and with greater recovery of muscle mass and strength during the subsequent rehabilitation period, compared with placebo. The study also reported changes in markers associated with muscle growth regulation.

Other work in this area, including research by Johnston and colleagues examining upper limb immobilisation, has reported similar patterns of attenuated loss.

The literature is small, and not every study has found the effect. But the direction is consistent enough to be worth taking seriously, and the outcome — retaining muscle you'd otherwise lose — matters more to someone in a cast than a few extra reps matters to a lifter.

Why it might work without training

Two plausible mechanisms, neither fully established.

Cell volumisation. Creatine draws water into muscle cells, and increased cell volume appears to act as an anabolic signal — a swollen cell behaves as though it's in a growth-favourable state, influencing protein synthesis and breakdown signalling. In a limb that isn't receiving mechanical stimulus, that may partially substitute for one.

Improved rehabilitation quality. Once you can train again, creatine's usual mechanism applies — more work per session during rehab, which accelerates recovery.

The second is less speculative than the first and probably accounts for a good share of the effect.

Who this is relevant to

• Post-surgical recovery, particularly orthopaedic — ACL reconstruction, shoulder repair, fracture fixation
• Limb immobilisation in a cast or brace
• Extended bed rest or hospitalisation
• Any injury preventing training for several weeks

Worth noting that the same mechanism is part of why creatine plus resistance training has become interesting in older adults, where preserving function is the objective rather than performance. See creatine after 50.

The important caveat

This is where it needs saying clearly.

If you're recovering from surgery or a significant injury, talk to your surgeon, physician or physiotherapist before starting any supplement. Not as a formality — there are real reasons:

• Post-surgical patients frequently have altered kidney function, are on medications, or have monitoring in place that creatine's effect on serum creatinine would complicate. See creatine and blood tests.
• Your care team may have specific protocols, and adding something they don't know about is unhelpful.
• Reduced mobility changes hydration and digestion, which is relevant with a polyol-sweetened product — three gummies contain 9 g of sugar alcohols. See the maltitol post.

The research is encouraging. It's not a reason to self-prescribe during medical recovery.

What matters more during injury recovery

Three things with stronger evidence than any supplement:

Protein intake. Requirements may be elevated during recovery, and adequate protein is central to limiting muscle loss. Creatine contributes none — our panel declares 0 g.

Total energy intake. Under-eating during recovery accelerates muscle loss. The instinct to cut calories because you're not training is counterproductive.

Doing whatever you're cleared to do. Even partial loading, isometrics on the uninjured side, or training other body parts helps considerably. Your physiotherapist's programme is the intervention; everything else supports it.

The summary

A small but interesting literature suggests creatine may limit muscle loss during immobilisation and improve recovery during rehabilitation. It's one of the more compelling applications outside performance — and one that specifically requires a conversation with your care team first.

General information about a natural health product, not medical advice.