Progressive Muscle Relaxation for Anxiety: What the Trials Show

Progressive muscle relaxation is one of the oldest structured techniques for managing anxiety, predating CBT by several decades. Its longevity reflects genuine utility — it works in the moment — but the evidence for lasting clinical benefit deserves the same careful examination as any other intervention.

What PMR is

Developed by Edmund Jacobson in the 1930s, PMR involves systematically tensing and then releasing different muscle groups while attending to the contrast between tension and relaxation. A typical session works through 10–16 muscle groups over 15–30 minutes. With practice, the process is shortened to rapid relaxation cues.

The logic is straightforward: anxiety is associated with muscle tension; deliberately releasing that tension produces a physiological state incompatible with the anxiety response. This is similar to the logic behind breathing exercises, targeting a different pathway to the same parasympathetic activation.

What the evidence shows

A meta-analysis of 27 relaxation training studies (predominantly PMR) found medium-to-large effects on anxiety compared with control conditions [1]. This sounds impressive, but most comparisons were with no-treatment or waiting-list controls, which inflate apparent benefit through the same mechanisms that inflate placebo responses in drug trials.

The picture is more complicated when PMR is compared with active treatments:

PMR versus CBT. In several trials, PMR or applied relaxation was used as the comparison condition for CBT. A meta-analysis of these direct comparisons found that relaxation was somewhat less effective than cognitive therapy for panic disorder, but equivalent to cognitive therapy for GAD [3]. This suggests relaxation may be a reasonable treatment specifically for GAD but less adequate for other anxiety disorders.

Applied relaxation for GAD. The most relevant evidence comes from applied relaxation (AR), which builds on PMR. Borkovec and Costello’s trial found that applied relaxation was comparable to CBT for GAD at one-year follow-up [5]. This is one of the stronger findings for a relaxation-based approach.

Mechanisms

How PMR reduces anxiety involves both peripheral and central pathways [4]:

Peripheral: Reduced muscle tension decreases proprioceptive feedback to the brain that signals threat or arousal. The “body relaxed, therefore safe” signal is real.

Autonomic: PMR reduces sympathetic nervous system activity and increases parasympathetic tone, similar to slow breathing.

Cognitive: Focusing attention on muscle sensations provides an attentional alternative to worry. Whether this is a genuine cognitive mechanism or simply distraction is debated.

Expectation: People expect relaxation exercises to reduce anxiety, and this expectation alone contributes to the effect, the same issue that complicates interpretation of mindfulness research.

A comparison of PMR, deep breathing and guided imagery found all three reduced self-reported anxiety and physiological arousal, with no clear superiority of any one technique [6]. This suggests the common relaxation factor may be more important than the specific technique.

PMR’s role in treatment

In current practice, PMR most often appears as:

• A component of applied relaxation protocols
• A comparison condition in CBT trials (which paradoxically generates evidence for it)
• A self-help technique recommended alongside other strategies
• A component of broader relaxation training programs

It is rarely offered as a standalone treatment for anxiety disorders in specialist services, where CBT is the standard first-line approach. But for GAD specifically, applied relaxation appears in some guidelines as an alternative when CBT is not available or preferred.

Questions to ask about PMR research

1. Was PMR tested alone or as part of applied relaxation or another package?
2. Was the comparison group a waiting list, active control or established treatment?
3. Were participants diagnosed with an anxiety disorder or self-referred?
4. How long was follow-up after the intervention ended?
5. Did the effect survive comparison with active placebo conditions?

What remains uncertain

Whether PMR works through its proposed muscle-tension mechanism or through non-specific factors (time, attention, expectation, general relaxation) has not been definitively established. Whether regular PMR practice produces lasting changes in anxiety vulnerability — as opposed to providing temporary relief — needs longer-term evidence. Whether modern technology-delivered PMR (apps, audio guides) is equivalent to therapist-taught PMR is assumed but not demonstrated.

Trying PMR. Progressive muscle relaxation is free, safe and easy to learn. Audio guides are widely available. It’s a reasonable tool for managing acute anxiety and physical tension. For clinical anxiety disorders, it works best as part of a broader treatment approach. If anxiety is affecting your daily life, talk to a GP or mental health professional. If you are in crisis or thinking about harming yourself, contact emergency services or a crisis line now: in the US, call or text 988; in the UK and Ireland, Samaritans on 116 123.