Progressive Muscle Relaxation and Guided Imagery
Progressive Muscle Relaxation and Guided Imagery
Progressive muscle relaxation (PMR) is a technique of alternately tensing and relaxing muscles groups in sequence throughout the body. When going through muscle groups, individuals can start with the head and neck and progress to the feet, or vice versa. Similarly individuals may do one side of the body at a time, or both sides at the same time. Listening to a prerecorded script may be used to guide individuals through the process. Addition of guided imagery to PMR involves use of mental visualization and use of imagination to enhance relaxation and alter specific experiences and may or may not include direct suggestion. Individuals may use recorded scripts to guide the creation of mental images. Guided imagery can integrate techniques founded in multiple psychological theory and hypnotherapy. PMR with guided imagery has been examined for effectiveness in patients with cancer for chemotherapy-induced nausea and vomiting, anxiety, fatigue, sleep-wake disturbances, and pain.
Effectiveness Not Established
Bardia, A., Barton, D.L., Prokop, L.J., Bauer, B.A., & Moynihan, T.J. (2006). Efficacy of complementary and alternative medicine therapies in relieving cancer pain: A systematic review. Journal of Clinical Oncology, 24, 5457–5464.doi: 10.1200/JCO.2006.08.3725
To evaluate the efficacy of various complementary and alternative medicine (CAM) therapies to reduce cancer pain
The type of article is systematic review.
- Databases searched were MEDLINE, EMBASE, CINAHL, Allied and Complementary Medicine (AMED), and the Cochrane Library up to August 2005. Investigators also searched reference lists from articles to identify relevant studies.
- Search keywords were cancer, pain and alternative medicine, and neoplasm, as well as terms for major individual CAM therapies.
- Studies were included in the review if they were randomized clinical trials (RCTs) that had a CAM intervention for cancer pain.
- Exclusion criteria were not cited.
The initial search identified 101 articles, of which investigators excluded 85. Investigators included an additional two articles, which were found through manual scans of reference lists. Investigators appraised articles by using the Jadad scale.
- The final sample included 18 studies reporting on 1,499 patients.
- The average sample included less than 100 patients; median sample size was 54 patients.
- Acupuncture: Investigators evaluated three trials, of which one was a high-quality study that used auricular acupuncture to treat 90 patients. Compared to the placebo group, the treatment group had a significant decrease in pain intensity that lasted two months.
- Mind-body interventions: Investigators assessed five trials. Two of these were trials of intermediate quality in which support groups were effective in decreasing pain. Interventions included group supportive psychotherapy, hypnosis, and support groups. Two trials concluded that relaxation and imagery were effective in reducing pain. Researchers obtained no greater relief by adding cognitive behavioral therapy to relaxation or imagery.
- Music: Assessment revealed that the three trials were of poor quality. Results were mixed. Effects measured were of very short duration.
- Herbal mixtures: Two trials examined different herbal supplements. Both trials were of poor quality, and one did not report actual statistical results. Authors could draw no meaningful conclusions from this information.
- Massage therapy: The four trials involving massage therapy had mixed results in terms of efficacy. Most of these trials had very small sample sizes, and none found intervention effects that lasted longer than four weeks.
- Healing touch or Reiki: Two trials involved these interventions. Results did not warrant conclusions about effectiveness.
The result of this systematic review was that none of these interventions can be recommended as effective. The most promising therapies appear to be mind-body interventions. In particular, hypnosis and relaxation might have some effect in decreasing cancer pain. Effect may be limited by cognitive impairment caused by cancer or cancer treatment. Support groups may have some positive effects. Whether these benefits are due to increased patient awareness, with more frequent visits to care providers, better compliance with medication regimens, or as a result of group interaction and social or emotional support is unclear. One study found that benefit occurred only in those patients who were more distressed at baseline. It is possible that effect sizes of therapies may be more discernible among patients with higher pain ratings, demonstrating a floor effect related to the symptom of pain.
- Most trials were of low quality, with missing data and incomplete reporting. This fact made extracting sufficient usable information difficult.
- Few studies in the analysis examined a specific intervention.
Current evidence does not support the efficacy of the cited CAM interventions in the management of pain of patients with cancer. Methodologically strong research that incorporates appropriate attentional and sham controls, sufficient sample sizes, and longer duration of follow-up is needed.
Research Evidence Summaries
Kwekkeboom, K.L., Wanta, B., & Bumpus, M. (2008). Individual difference variables and the effects of progressive muscle relaxation and analgesic imagery interventions on cancer pain. Journal of Pain and Symptom Management, 36, 604–615.doi: 10.1016/j.jpainsymman.2007.12.011
To assess, among hospitalized patients with cancer-related pain, responses to progressive muscle relaxation (PMR) and analgesic imagery, including the impact of these interventions on pain-related distress and perceived control over pain
To examine the influence of ability, outcome expectancy, previous experience, and concurrent symptoms on the effectiveness of the interventions
Intervention Characteristics/Basic Study Process:
Scripts relating to "control conditions," PMR, and guided imagery interventions were recorded on a CD. The recorded voice was male, and the recording did not include music. The day 1 control recording consisted of identification of health team members, explanation of patient rights, and a description of various hospital services. The second control recording described exercise and other activities to maintain strength while hospitalized and presented issues for consideration in discharge planning. The PMR recording guided listeners in tensing and relaxing muscles in a series of 12 major muscle groups from head to feet. The analgesic, or guided imagery, recording asked listeners to scan their bodies to identify areas of pain and to imagine replacing pain with comforting sensations. Then the recording asked listeners to imagine putting their hand in an anesthetic fluid, feeling it go numb, and then transfer the numbness to painful areas of the body. All recordings were of similar length. Trials were done when current pain was rated 2–8 on a 10-point scale. Trials were delayed if patients had received an oral analgesic within one hour or an IV analgesic within 30 minutes. Patients with the option of patient-controlled analgesia were asked to refrain from increasing doses during the 15-minute trial and were maintained on basal continuous infusion. A control trial was the first trial done each day. If pain persisted at the end of the control trial, the research nurse continued with whichever experimental trial was assigned for that day. Two intervention trials were done each day, at least one hour apart. Patients completed pre- and post-trial ratings of pain intensity and related distress. For each outcome measured, scores were averaged across two control, two PMR, and two analgesic imagery trials. In cases where only one trial was completed, this score was used in analysis. Patients were randomly assigned to two different groups. In one group, PMR preceded imagery interventions; in the other, the sequence was reversed. All patients received the same control trials.
- The study reported on a sample of 32 patients.
- Mean patient age was 48.9 years (SD = 16.29 years).
- The sample was 55% female and 45% male.
- Of all patients, 55% had hematologic malignancy.
- All patients were Caucasian.
- The average number of months since diagnosis was 18.36 (SD = 33.32 months). Of all patients, 33% were receiving chemotherapy, 13% were undergoing radiotherapy, and 20% were undergoing combined therapy; 78% were being treated with a combination that included a strong opioid, a weak opioid, and nonopioid medications for pain management.
- Single site
- Inpatient setting
- Academic medical center in the Midwest, United States
The study used a crossover design with control.
- Scale of pain intensity (0 = no pain, 10 = worst pain imaginable)
- Scale of pain distress (0–10)
- Control Subscale of the Survey of Pain Attitudes
- Imaging Ability Questionnaire
- Outcome Expectancy Scale
- Edmonton Symptom Assessment Scale
- Compared to the control conditions, PMR resulted in greater change in pain intensity (Z = –2.15, p < 0.05) and pain-related distress (Z = –1.82, p < 0.05) and greater perceived control over pain (Z = –3.02, p < 0.01).
- Compared to the control conditions, guided imagery resulted in greater change in pain intensity (Z = –2.7, p < 0.01), change in pain-related distress (Z = –2.11, p < 0.05), and greater perceived control over pain (Z = –2.4, p < 0.01).
- PMR was associated with meaningful reduction in pain for 41% of participants. Imagery was associated with meaningful improvement in pain for 52% of patients. Authors defined meaningful improvement as an improvement greater than or equal to 30% reduction in pain intensity along with improvement in pain-related distress or perceived control.
- Compared to other patients in the study, those who experienced meaningful improvement with imagery had greater imaging ability (p < 0.05), more positive outcome expectancy (p < 0.05), and fewer concurrent symptoms (p < 0.05).
- The control condition was associated with some reduction in pain intensity and pain-related distress.
In only 50% of patients did PMR and guided imagery appear to have a more positive short-term effect on pain intensity, pain-related distress, and perceived control of pain than did simple distraction. Variables examined did not appear to influence the effects of PMR, but expectations and number of concurrent symptoms appeared to influence the effects of guided imagery.
- The study had a small sample size, with fewer than 100 participants.
- Interventions had very short-term effects on the outcomes examined. Authors did not state how long patients had been experiencing pain; whether patients were suffering acute, chronic, or episodic pain was unclear.
- Of all patients approached for participation, 41% declined to enter the study.
Despite the crossover design, the study had risk of bias due to several factors.
- Pain intensity measures were self-reported by patients.
- Patients certainly knew the difference between the control and intervention recordings.
- Analysis was limited to comparisons between responders and nonresponders; therefore, the capacity of the investigators to identify influencing variables was limited.
- While changes in pain intensity showed differences that were statistically significant, whether the changes were clinically significant is unclear.
- Many factors can affect the results evaluated (e.g., time of day, nature of hospital care, activities of the day). Investigators could not have accounted for or controlled for these factors.
- The trial was extremely brief, only two days.
PMR and analgesic imagery, facilitated by a recording on CD, might be helpful to some patients to reduce short-term pain intensity, decrease pain-related distress, and increase sense of control over pain. However, much more evidence is needed before investigators can draw firm conclusions. These interventions could be implemented easily in a hospital setting and do not appear to harm patients. They appear to be more effective for individuals with greater ability to imagine, greater expectations of effectiveness, and fewer additional symptoms. This fact might lead clinicians to identify that group of patients most likely to benefit from such interventions.