Why "just rest it" is often the wrong advice for a musculoskeletal injury
By Dr Kimberley Wells, MBBS FACSEP · 26 May 2026 · 4 min read
Complete rest used to be the default recommendation for most musculoskeletal injuries. It was simple, easy to communicate, and difficult to argue with: if something hurts when you move it, stop moving it. The evidence has moved on considerably from that position, and in most clinical scenarios prolonged rest is not neutral. It actively works against recovery.
Where the rest advice came from
The RICE acronym (Rest, Ice, Compression, Elevation) was the standard first-aid framework for soft tissue injuries for decades. It was coined in the late 1970s and became embedded in sports medicine education, physiotherapy training, and lay health advice. The "Rest" component in particular became generalised well beyond its original context of acute injury first aid into a default recommendation for ongoing injury management.
There are several reasons rest became the default. It is protective in the very early phase of an acute injury. It is safe in the sense that it avoids the risk of making things worse through inappropriate loading. And it requires nothing from the clinician in terms of designing a graduated programme. The problem is that appropriate in the first 48 to 72 hours after an acute injury is not the same as appropriate for the weeks and months that follow.
The RICE framework itself has since been revised. The sports medicine community has largely moved to frameworks like PEACE and LOVE (Protect, Elevate, Avoid anti-inflammatories, Compress, Educate; then Load, Optimism, Vascularisation, Exercise), which explicitly acknowledge that active rehabilitation supersedes rest in the medium and longer term.
What happens with too much rest
Musculoskeletal tissues respond to the loads placed on them. Tendons, muscles, cartilage, bone, and ligaments all adapt to mechanical stress: they become stronger and more capable when loaded appropriately, and they lose capacity when unloaded. This is not a minor effect. Studies of immobilisation consistently show that tendon stiffness and muscle cross-sectional area decline measurably within weeks of complete rest.
For tendons specifically, prolonged rest tends to perpetuate or worsen tendinopathy rather than resolve it. Tendon tissue requires cyclical loading to stimulate collagen remodelling. Without that stimulus the disorganised tissue characteristic of tendinopathy does not resolve, and the tendon's capacity to tolerate load does not improve.
There are also secondary effects of prolonged rest that matter clinically: cardiovascular deconditioning, weight change, sleep disruption, and the well-documented relationship between physical inactivity and low mood. For someone who is active by identity, an instruction to rest completely can have consequences that extend beyond the injured tissue.
The optimal loading principle
Optimal loading is the clinical principle that replaces "rest it." The idea is straightforward: injured tissue needs to be loaded at a level that stimulates adaptation without overloading the structure to the point of further damage. The load is neither zero nor unrestricted. It is calibrated to what the tissue can tolerate at each stage of recovery, then progressively increased as capacity improves.
In practice this looks different depending on the tissue and the injury. For a quadriceps tendinopathy, optimal loading might begin with isometric contractions (no joint movement, just muscle contraction against resistance), progressing through isotonic exercises and eventually sport-specific loading. For a muscle strain, early range-of-motion work within pain limits is typically appropriate before progressing to strengthening. For a stress fracture of bone, it means a graduated return to weight-bearing rather than absolute non-weight-bearing for longer than is necessary.
The common thread is that the programme is active rather than passive, and that the dose of load is matched to where the tissue is in its recovery rather than to a fixed protocol or a blanket restriction. This is part of what a return to sport assessment addresses, and it is also central to the approach to exercise as medicine for conditions that are not sports injuries per se.
Using pain as a guide
One of the barriers to optimal loading is uncertainty about how to interpret pain during rehabilitation. If something hurts when you exercise it, is that harmful or expected? The answer is context-dependent, but there is a practical framework that is useful for most musculoskeletal conditions.
Pain during loading should generally be kept at or below 3 out of 10 on a simple pain scale. Pain that stays within this range during an exercise, and that settles back to baseline within 24 hours, is generally consistent with acceptable tissue load. Pain that exceeds this level, or that produces a meaningful increase in baseline symptoms the following day, suggests the load was too high and should be reduced before the next session.
This is sometimes called the traffic light rule or the monitoring rule. It gives patients a way to self-regulate their rehabilitation between appointments without the binary of "no pain is acceptable" (which leads to underloading) or "push through it" (which leads to overloading). Most people find it intuitive once it is explained.
There are exceptions. Sharp mechanical pain, pain with a neurological quality, or pain that is worsening progressively despite conservative loading are signals that warrant review rather than self-guided progression. The 0-3/10 rule is a guide for known diagnoses with a rehabilitative plan, not a substitute for assessment when the clinical picture is unclear.
When rest is actually indicated
Rest is appropriate in specific circumstances. In the first 48 to 72 hours after an acute soft tissue injury, protecting the injured area from further load is reasonable while the initial inflammatory phase runs its course. For certain bone stress injuries, particularly complete or high-risk stress fractures, a period of protected weight-bearing or non-weight-bearing is genuinely necessary and the consequence of ignoring it can be significant.
The distinction to draw is between relative rest and absolute rest. For most injuries, relative rest means modifying activity to remove the provocative load while maintaining as much general movement and activity as possible. A runner with Achilles tendinopathy should generally stop running for a period, but does not need to stop walking, swimming, or cycling if those activities are well tolerated. A person with a shoulder rotator cuff injury should avoid overhead lifting but can typically maintain lower limb training without consequence.
Preserving as much activity as possible during injury management is not about ignoring the injury. It is about recognising that the parts of the body that are not injured continue to benefit from movement, and that the general metabolic and psychological benefits of physical activity are worth protecting wherever it is safe to do so.
For information on how the clinic approaches graduated rehabilitation and return to activity, see the return to sport page and the exercise as medicine page.
