Yoga is an ancient Eastern science that incorporates stress-reduction techniques such as regulated breathing, visual imagery, and meditation, as well as various postures. Hatha yoga is one type of yoga. Yoga has been examined as an intervention for anxiety, depression, chemotherapy-induced nausea and vomiting, hot flashes, cognitive impairment, sleep-wake disturbances, pain, and fatigue in patients with cancer. It has also been examined as an intervention for caregiver strain and burden.
Buffart, L.M., van Uffelen, J. G., Riphagen, I. I., Brug, J., van Mechelen, W., Brown, W. J., & Chinapaw, M. J. (2012). Physical and psychosocial benefits of yoga in cancer patients and survivors, a systematic review and meta-analysis of randomized controlled trials. BMC Cancer, 12, 559.
STUDY PURPOSE: Evaluate effects of yoga on physical and psychosocial symptoms
TYPE OF STUDY: Meta Analysis & Systematic Review
DATABASES USED: AMED, CINAHL, British Nursing Index, CENTRAL, EMBASE, PEDro, psycINFO, PubMed and SPORT-Discus
KEYWORDS: States detailed search profiles available on request
INCLUSION CRITERIA: RCT, adults with any cancer diagnosis, yoga intervention including physical postures, control group non exercise
EXCLUSION CRITERIA: Yoga included as part of a larger intervention such as mindfulness based stress reduction were excluded
TOTAL REFERENCES RETRIEVED : N = 1909
EVALUATION METHOD AND COMMENTS ON LITERATURE USED Study method quality evaluated using a Delphi list previously developed and tested. Low quality defined as <50% of possible total score.
FINAL NUMBER STUDIES INCLUDED; N(studies) = 13
SAMPLE RANGE ACROSS STUDIES, TOTAL PATIENTS INCLUDED IN REVIEW: Range 18-128
KEY SAMPLE CHARACTERISTICS: 12 studies involved breast cancer patients, 1 was in lymphoma
PHASE OF CARE: Multiple phases of care
Physical outcomes: Pain was evaluated in 4 studies, meta analysis of 2 of these showed a large effect size (d=-0.63, 95% CI -0.98, -0.31)
Psychosocial outcomes: Reduced anxiety (d=-0.77; 095% CI -1.08, -0.46) fatigue (d=-.051, 95% CI -0.79,-0.22) Effects on sleep disturbance were small and insignificant.
Dropout rates ranged from 0-38%
Interventions ranged from planned 6 -15 sessions. Some studies involved supervised yoga classes, and some involved home practice only. Studies involved patients in active treatment and others involved cancer survivors who had completed treatment.
Findings suggest that yoga may be helpful to reduce anxiety and fatigue in patients with cancer.
States 3 studies included participant blinding or double blinding – it is unclear how a participant would not know they were receiving a yoga intervention. Varied methods of measurement were used in the studies included – there is no description of how these were handled in meta analysis. There is no report of heterogeneity findings. Most studies were very small sample sizes. There was a wide range of drop -out rates and no information about how this was handled in analysis. Studies did not include attentional control conditions, so it is unclear how much effect was due to group support versus the actual yoga activity. No differentiation was made between group session interventions versus patients who did home practice alone after instruction.
Findings do not provide strong support for effectiveness of yoga for sleep. Findings do suggest that yoga may be helpful for patients to reduce anxiety and fatigue. Nurses can support involvement in this type of activity for patients who are interested in participating in yoga.
Chiu, H.Y., Chiang, P.C., Miao, N.F., Lin, E.Y., & Tsai, P.S. (2014). The effects of mind-body interventions on sleep in cancer patients: A meta-analysis of randomized controlled trials. Journal of Clinical Psychiatry, 75, 1215–1223.
PHASE OF CARE: Multiple phases of care
The primary outcome was a change in a sleep parameters. The results of the meta-analysis indicated that MBIs had a medium effect size on the improvement of sleep quality, and this effect persisted up to three months after treatment. The weighted mean effect size was -0.43 (95% CI, -0.24 to -0.62), and the long-term effect size (up to three months) was -0.29 (95% CI, -0.52 to -0.06). The sensitivity analysis revealed that MBIs had a significant effect on sleep (g = -0.33, p < 0.001). The moderating effects of components of the intervention, methodologic features, subject characteristics, and the quality of the studies on the relationship between MBIs and sleep were not found (all p values > 0.05). The main interventions used in included studies in which yoga and mindfulness-based stress reduction were employed. Some studies involved the use of meditation, hypnosis, or sleep hygiene interventions. Yoga interventions yielded an effect size similar to that of other individual interventions (g = -0.40, p = 0.71).
This meta-analysis suggested that MBIs yield a medium effect size on sleep quality, and its effects are maintained for up to three months.
Although there was a comprehensive review of the literature, the selection criteria may have limited the studies included in the review, and the search strategies may have influenced the articles obtained. Only RCTs with MBIs reporting improved sleep outcomes may have been published, and studies with negative results may have been missed, causing a publication bias. Analysis was only done across all studies, which had substantially different interventions, some of which included cognitive behavioral therapy, which is shown to be effective in sleep improvement. The validity of calculating results across studies with very different interventions is questionable. Different methods of measurement were used in some studies as well. The included studies all lacked attention control.
The findings of this meta-analysis support the implementation of MBIs into multimodal approaches to managing sleep quality in patients with cancer; however, it should be recognized that this pooled analysis was done across specific interventions that were very different from each other, and there are multiple limitations that affect the strength of these conclusions.
Sharma, M., Haider, T., & Knowlden, A.P. (2013). Yoga as an alternative and complementary treatment for cancer: A systematic review. Journal of Alternative and Complementary Medicine, 19, 870-875.
STUDY PURPOSE: To determine the efficacy of yoga as a treatment option in cancer
TYPE OF STUDY: Systematic review
DATABASES USED: CINAHL, MEDLINE, and Alt Healthwatch
KEYWORDS: Yoga and cancer and intervention or program
INCLUSION CRITERIA: Quantitative design; measured anxiety, depression, sleep disturbance, pain, quality of life, and/or stress as an outcome; published since 2010; English language; included any form of yoga as part of or the entire treatment of cancer
EXCLUSION CRITERIA: Not quantitative design
TOTAL REFERENCES RETRIEVED: N = 135
EVALUATION METHOD AND COMMENTS ON LITERATURE USED: No specific method of evaluating study quality is reported.
PHASE OF CARE: Multiple phases of care
APPLICATIONS: Pediatrics
Of four studies examining effect on anxiety, two showed no effect and two showed a significant positive effect. One of these was a positive effect on parents. Two studies showed a positive effect for fatigue, and one showed no effect for fatigue. There were no effects seen for depression. One study showed a positive effect for sleep, and one showed no effect for sleep. One study of 18 breast cancer survivors showed a postitive effect for fatigue immediately after the intervention. Six of the studies used a randomized controlled trial (RCT) design. Duration and dosing of the yoga intervention varied substantially across studies. All of the studies used an instructor for the duration of the intervention. Methods of measurement used varied.
Insufficient evidence exists to draw firm conclusions about yoga’s role and effect in cancer treatment.
There were few studies, and most had very small sample sizes. No information regarding the quality of the studies was included, other than general design, as this included both RCTs and quasiexperimental studies.
There is limited evidence regarding the effects of yoga as a complementary approach in cancer treatment.
Zhang, J., Yang, K.H., Tian, J.H., & Wang, C.M. (2012). Effects of yoga on psychologic function and quality of life in women with breast cancer: A meta-analysis of randomized controlled trials. Journal of Alternative and Complementary Medicine, 18, 994-1002.
STUDY PURPOSE: To evaluate the effects of yoga in women with breast cancer
TYPE OF STUDY: Meta-analysis and systematic review
DATABASES USED: PubMed, EMBASE, Cochrane Library, Chinese Biomedical Literature Database, and Chinese Digital Journals Database
KEYWORDS: Yoga or asana and breast cancer, and additional breast cancer terms
INCLUSION CRITERIA: Randomized controlled trial (RCT) comparing yoga or yoga-based intervention with a control group
EXCLUSION CRITERIA: Studies that included yoga as part of a larger intervention
TOTAL REFERENCES RETRIEVED: N = 86
EVALUATION METHOD AND COMMENTS ON LITERATURE USED: Cochrane handbook was used for evaluation of methodological quality. Randomization was unclear in all but one study, and only one study blinded investigators. Three studies did not report complete outcome data, and dropouts were substantial percentages of the sample in all studies
Anxiety was measured in two studies, and meta-analysis showed no significant effect. Depression was measured in two studies, and meta-analysis showed no significant effect of yoga on depression. Fatigue was examined in five studies with no significant effect shown in meta-analysis. Sleep was measured in two studies with no significant effect shown in meta-analysis. Overall, quality of life was the only outcome measure in which a significant effect was seen from meta-analysis (SMD = 0.27, p = .03).
Insufficient evidence exists to advocate for the use of yoga in patients with breast cancer. No significant effects were seen related to anxiety, depression, sleep disturbance, or fatigue in these patients.
A small number of studies were included, and all had methodological limitations. Yoga interventions differed and varied in frequency and duration.
Insufficient evidence exists to show a benefit of yoga for women with breast cancer. High quality research is needed to evaluate the effects of yoga for symptom management.
Bower, J. E., Garet, D., Sternlieb, B., Ganz, P. A., Irwin, M. R., Olmstead, R., & Greendale, G. (2012). Yoga for persistent fatigue in breast cancer survivors: a randomized controlled trial. Cancer, 118, 3766–3775.
To examine, relative to a health education control, the feasibility and efficacy of an Iyengar yoga intervention for breast cancer survivors with persistent posttreatment fatigue.
Outcome assessors of the performance tasks were blinded to group assignment. The intervention was briefly but fully described, and then participants were randomly assigned to a group that received a 12-week, Iyengar-based yoga intervention or a group that received 12 weeks of a health education (control group).
The study was a randomized, controlled trial.
Relative to the control group, fatigue severity in the intervention group declined significantly (p = 0.032) from baseline to posttreatment and over the three-month follow-up. In addition, relative to the control group, the yoga group had significant (p = 0.011) increases in vigor. Both groups had positive changes in symptoms of depression and perceived stress (p < 0.05). The authors noted no significant changes in sleep or physical performance.
One adverse protocol-related event occurred: a participant with a history of back problems experienced a back spasm in yoga class. After evaluation by her physician, she returned to class.
A targeted yoga intervention led to a significant reduction in fatigue and improvement in vigor among breast cancer survivors with persistent fatigue symptoms. This conclusion should be understood in the context of the study: participants were relatively healthy and without comorbid conditions found in the general population.
This study offered minimal conclusive data in support of the intervention. Preliminary findings indicated that the yoga intervention is feasible and safe and has a positive effect on fatigue. A larger trial that includes participants with common comorbid conditions—a study more representative of the general population of women with breast cancer posttreatment—is warranted. Secondary outcomes included vigor, symptoms of depression, sleep, perceived stress, and physical performance.
Carson, J. W., Carson, K. M., Porter, L. S., Keefe, F. J., & Seewaldt, V. L. (2009). Yoga of Awareness program for menopausal symptoms in breast cancer survivors: results from a randomized trial. Supportive Care in Cancer, 17, 1301–1309.
The study evaluated the effects of a yoga intervention on menopausal symptoms among breast cancer survivors.
Patients were randomized to the yoga intervention or a wait-list control group. The intervention consisted of eight weekly, 120-minute, group classes led by a certified yoga instructor. Classes were videotaped and reviewed. Sessions involved 40 minutes of stretching poses, 10 minutes of breathing techniques, 25 minutes of meditation, 20 minutes of study of pertinent topics, and 25 minutes of group discussion. CD recordings were provided for home practice. Application of concepts to daily life were assigned weekly. Assessments were performed at baseline, posttreatment, and three months postintervention. Wait-list controls were reminded about the assessments they needed. Patients kept daily diaries to rate hot flashes and daily use of yoga.
The study was performed in outpatient clinics at Duke University.
The study was a randomized, controlled trial.
Those in the yoga group had a significantly better decline in hot flash frequency, severity, joint pain, fatigue, and sleep disturbance (p < 0.002). Patients in the control group had significantly better decline in the degree to which they were bothered by symptoms (p < 0.0001). There was no difference in night sweats. Mean yoga practice time spent in use of techniques was associated with less fatigue (p = 0.032). Yoga daily participation ranged from 7.3 to 64.6 minutes. There was a 76% completion rate in the yoga group.
The findings suggested a potential benefit of a group yoga and support intervention for some symptoms in breast cancer survivors.
The findings suggested that yoga and support activities provided in a group setting may help patients with symptoms of hot flashes, sleep deprivation, and fatigue. There was no apparent effect on night sweats.
Chandwani, K.D., Perkins, G., Nagendra, H.R., Raghuram, N.V., Spelman, A., Nagarathna, R., . . . Cohen, L. (2014). Randomized, controlled trial of yoga in women with breast cancer undergoing radiotherapy. Journal of Clinical Oncology, 32, 1058–1065.
To test whether participation in yoga during radiation therapy would have long-term effects on fatigue, depression, and sleep disturbances
Patients were randomly assigned to one of three groups: a yoga group, an exercise group, and a wait list control group. Yoga and exercise groups attended up to three 60-minute sessions per week during six weeks of radiation therapy. These were given one-on-one or in groups according to the patient’s convenience and schedule. Each received a CD and written program manual to encourage at-home practice. The yoga program included warm-up breathing, postures, deep relaxation, alternate nostril breathing, and meditation. The exercise program included exercises specifically recommended for women recovering from breast cancer treatment involving multiple positions and stretching. Study assessments were done at baseline, during the last week of treatment, and at one, three, and six months after treatment.
Greater increases in physical component scores of the SF-36 were seen in the yoga group compared to both other groups at one and three months (p = .01). The yoga group (p = .04) and exercise group (p = .02) had greater reduction in fatigue compared to wait list controls at the end of treatment. These differences were not significant at other time points. Fatigue consistently declined over time in all patient groups. Sleep quality improved in all groups over time with no significant differences between groups.
Both yoga and exercise were associated with reduced fatigue by the end of radiation treatment; however, these effects were not maintained over the following six months.
Findings showed that both yoga and exercise programs during radiation therapy were beneficial in reducing fatigue. Fatigue declined over time in all patients, and effects seen by the end of treatment did not appear to last. The follow-up information here is limited by the high number lost to follow-up, showing the difficulty of conducting longitudinal examination of intervention effects. Nurses can recommend that patients participate in programs such as yoga and exercise during active cancer therapy.
Chaoul, A., Milbury, K., Spelman, A., Basen-Engquist, K., Hall, M.H., Wei, Q., . . . Cohen, L. (2018). Randomized trial of Tibetan yoga in patients with breast cancer undergoing chemotherapy. Cancer, 124, 36–45.
The purpose was to conduct a randomized control clinical trial examining the effects of a Tibetan yoga program compared to stretching and usual care group on sleep and fatigue among patients with breast cancer receiving chemotherapy.
Upon consent, patients completed a seven-day baseline assessment using actigraphy. At completion of baseline, patients were randomized to one of three treatment groups: Tibetan yoga, stretching, or usual care using adaptive randomization, minimization (age, stage of disease, time since diagnosis, baseline fatigue scores, menopausal status, surgical history, and chemotherapy regimen). Tibetan yoga and stretching groups attended four classes with trained instructors that ranged from 75 to 90 minutes each during chemotherapy. Patients then received three in-home booster sessions over six months. During the entire trial, patients were encouraged to practice at home. Long-term follow-up assessments were completed at 1 week and 3, 6, and 12 months postintervention. The usual care group was instructed not to perform yoga during the study period but given the opportunity to participate in yoga classes at the end of the study.
PHASE OF CARE: Multiple phases of care
Randomized controlled trial
Of the 352 that completed baseline, 74 were randomized to yoga group, 68 to the stretching, and 85 to the wait-list. There were no group differences noted in demographics in the three sample groups. The dropout rate in each group was similar. PSQI global sleep scores were significantly lower in participants who completed the intervention (p = 0.04). The majority of patients in both intervention groups completed all sessions (73% yoga, 74% stretching). No group differences were noted on completeness and practice in both groups. For main outcomes, no significant differences in sleep or fatigue were noted between groups over time. Within-group differences were noted with PSQI sleep disturbances, where the yoga group had significantly lower disturbances after week 1 postintervention compared to stretching (p = 0.03) and usual care (p=0.02). Actigraphy data showed reduced wake after sleep onset (in minutes) for yoga compared to stretching (p = 0.0003) and usual care (p = 0.0002).
The completion of four sessions of Tibetian yoga provided short-term reduction in subjective and objective sleep outcomes compared to stretching but not to usual care. Practicing outside of the intervention setting showed better outcomes in sleep. There was also support to ensure that yoga instruction occurred in-person to maximize patient outcomes and benefit.
Outcomes from this trial provide nurses with additional evidence that yoga could be beneficial for sleep-wake disturbances. However, the results are viewed with caution as the intervention did not show significant improvement compared to usual care.
Cohen, L., Warneke, C., Fouladi, R. T., Rodriguez, M. A., & Chaoul-Reich, A. (2004). Psychological adjustment and sleep quality in a randomized trial of the effects of a Tibetan yoga intervention in patients with lymphoma. Cancer, 100, 2253–2260.
The Tibetan yoga (TY) intervention involved seven weekly sessions with a yoga instructor who used imagery and exercise and included four aspects: controlled breathing and visualization, mindfulness, two types of posture, and daily practice. Outcomes were psychological adjustment, sleep, and fatigue.
Patients were undergoing the active treatment and long-term follow-up phases of care.
The study used a prospective, quasiexperimental design with two groups, including a wait-list control.
Pittsburgh Sleep Quality Index (PSQI)
The TY group reported significantly lower sleep disturbances scores (total PSQI) at follow-up (5.8 for TY versus 8.1 for the wait-list control). At follow-up, the TY group reported better subjective sleep quality, shorter latency, longer duration, and use of fewer sleep medications.
Cramer, H., Pokhrel, B., Fester, C., Meier, B., Gass, F., Lauche, R., . . . Langhorst, J. (2015). A randomized controlled bicenter trial of yoga for patients with colorectal cancer. Psycho-Oncology, 25, 412–420.
To evaluate the effects of yoga on quality of life, anxiety, depression, and sleep in patients with colorectal cancer.
At week 10, the yoga group had greater decline in anxiety (p = 0.043) and depression (p = 0.038) scores, but, at week 22, there was no difference between groups. At week 10, there were no differences between groups in PSQI scores, however, at week 22, those in the yoga group had better sleep quality (p = 0.043). There was no relationship between home practice time and outcomes. Only about half attended yoga sessions, and average home practice was about one hour per week. There were no significant differences between groups in overall quality of life scores.
Yoga may be helpful to some patients to reduce sleep disturbances.
These results did not show meaningful impact of yoga on anxiety or depression. Yoga was beneficial in terms of improving sleep, although changes seen were small, and findings are limited due to study limitations. Further research in the potential role of yoga for sleep improvement is needed.
Dhruva, A., Miaskowski, C., Abrams, D., Acree, M., Cooper, B., Goodman, S., & Hecht, F. M. (2012). Yoga breathing for cancer chemotherapy-associated symptoms and quality of life: results of a pilot randomized controlled trial. Journal of Alternative and Complementary Medicine, 18, 473–479.
To assess the feasibility and effects of pranayama (regulation and expansion of breath) among patients receiving chemotherapy. To test the efficacy of pranayama in alleviating common chemotherapy-associated symptoms (fatigue, sleep disturbance, stress, anxiety, and depression) and improving quality of life (QOL). To evaluate patients' responses to the use of pranayama in alleviating common chemotherapy-associated symptoms affecting QOL.
Participants were randomized 1:1 in blocks of four. The allocation sequence was generated by the study statistician and then transferred to sealed numbered envelopes. The study staff enrolled participants and implemented the allocation sequence, which was concealed from the study staff until study assignment. Blinding of participants was impossible due to the intervention, which consisted of a 60-minute class once per week taught by yoga instructors and twice daily home practice that totaled 20 to 30 minutes per day, along with usual care during two cycles of chemotherapy. The control group received only usual care during the initial cycle of chemotherapy, and the pranayama intervention along with usual care during the second cycle of chemotherapy.
Patients were undergoing the active treatment phase of care.
The study was a randomized, controlled trial.
Sixteen of 18 participants completed all study measures: eight from the control group and eight from the treatment group. The study intervention had no adverse effects. Increased yoga practice was associated with statistically significant reductions in sleep disturbance (p = 0.04) and anxiety (p = 0.04). The mental component of QOL approached statistical significance (p = 0.05).
This was the first study of a pure pranayama intervention for patients with cancer, and it demonstrated that yoga breathing is a feasible and safe intervention for this patient population. Any increase in the yoga breathing practice correlated with improvements of chemotherapy-associated symptoms and QOL. Researchers should confirm these findings by means of a larger study.
Among patients with cancer who are undergoing chemotherapy, pranayama breathing techniques may help decrease sleep disturbance and anxiety and increase the mental component of QOL. Pranayama breathing, supplemented with reminders during and between treatments, seems to be an intervention that is feasible for this group of patients.
Janelsins, M.C., Peppone, L.J., Heckler, C.E., Kesler, S.R., Sprod, L.K., Atkins, J., . . . Mustian, K.M. (2015). YOCAS©® Yoga reduces self-reported memory difficulty in cancer survivors in a nationwide randomized clinical trial: Investigating relationships between memory and sleep. Integrative Cancer Therapies, 15, 263–271.
To investigate the effect of a combined hatha and restorative yoga intervention on memory in cancer survivors and to explore relationships between memory and sleep
YOCAS©® (Yoga for Cancer Survivors) is an instructor-guided standardized program that incorporates movement emphasizing restorative poses, breathing exercises, and mindfulness exercises. The intervention was offered twice a week in the late afternoon or evening over 75 minutes for a total of eight sessions. Although all the group trainers were Registered Yoga Alliance Teachers, they were also required to complete a training session, reviewing a detailed YOCAS©® manual to facilitate standardization across sites.
PHASE OF CARE: Late effects and survivorship
Secondary analysis of a randomized, clinical trial
At baseline, the average score on the MDASI indicated only a mild level of perceived memory problems overall. Although both groups continued to report memory problems as being mild, a significant decrease (p < 0.05) was observed in patients who completed the intervention. This difference continued to be significant when controlling for differences in age, gender, educational level, past treatment regimen, current hormonal therapy, baseline memory, and baseline sleep scores. Of note, those who received the intervention also had improved sleep (p < 0.05), which accounted for approximately 26% of the improvement in memory (p = 0.039).
Although yoga appeared to decrease perceived memory problems, this outcome was based on a single item of the MDASI. Further longitudinal studies designed specifically to measure the effect of yoga on cognitive function as measured by both objective and subjective measures are warranted.
Although this study suggested that yoga may improve patients’ perception of memory problems, some of the benefit was because of better sleep.
Kiecolt-Glaser, J.K., Bennett, J.M., Andridge, R., Peng, J., Shapiro, C.L., Malarkey, W.B., . . . Glaser, R. (2014). Yoga’s impact on inflammation, mood, and fatigue in breast cancer survivors: A randomized controlled trial. Journal of Clinical Oncology. Advance online publication.
To assess the effects of yoga on inflammation, mood, and fatigue and to test the hypothesis that yoga would decrease inflammation, depressive symptoms, and fatigue in breast cancer survivors
Women were randomly assigned to the intervention group or a wait-list control group. The intervention consisted of two 90-minute Hatha yoga sessions per week for 12 weeks delivered in a group setting. Sessions were audiotaped, and 50% were randomly assessed for differences from predetermined poses to assess fidelity of the intervention. Yoga teachers called anyone who missed a class. Home practice was encouraged, and all practice times were recorded by participants in weekly logs. Data were collected at baseline, immediately after the intervention, and after three months post-treatment.
Single-blinded, randomized, controlled trial
Patients attended a median of 79% of yoga classes and reported an average of 24.69 minutes of practice per day at home and in class over 12 weeks. Immediately after the intervention, there were no differences between the groups in fatigue; however, in the yoga group, fatigue was significantly lower at three months (Cohen’s d = -0.36, p = 0.002). Vitality in the yoga group was significantly higher immediately post-treatment and at three months (p = 0.01). There were no differences between the groups in depressive symptoms. Immediately postintervention, there were no differences between groups in cytokine levels; however, at three months, the yoga group had significantly lower cytokine levels compared to the control group (p < 0.05). Yoga participants reported improved sleep compared to patients in the control group (p = 0.03).
Yoga was associated with reduced fatigue, increased vitality, improved sleep, and reduced cytokine levels. Yoga did not appear to have an effect on depressive symptoms in this study.
The findings of this study demonstrated that yoga practice was effective in reducing fatigue and improving vitality and sleep in this patient population. Nurses can suggest that patients become involved in yoga practice as a way to manage fatigue and sleep disturbance. These findings also suggest that yoga can have an impact on subclinical inflammation, which may be a mechanism that fuels fatigue and the decline of physical function.
Milbury, K., Chaoul, A., Engle, R., Liao, Z., Yang, C., Carmack, C., . . . Cohen, L. (2014). Couple-based Tibetan yoga program for lung cancer patients and their caregivers. Psycho-Oncology, 24, 117–120.
To examine the feasibility and preliminary efficacy of Tibetan yoga practice as a supportive approach for patients and caregiver dyads during radiation therapy for lung cancer
Participants had two to three weekly sessions of yoga for 45–60 minutes over five to six weeks. The program included deep breathing awareness and visualization, guided meditation, compassion-based meditation, and gentle movements coordinated with specific breathing patterns. Patients and caregivers completed study measures at baseline and at the end of the program.
Single-group, prospective pilot study
Ten of 19 consenting dyads completed the study and attended a mean of 12 sessions (range = 6–15). For patients, there was a significant increase in spiritual well-being (d = 1.12, p = .03), improvement in sleep (d = .60), and depressive symptoms (d = .52). There were small effects for anxiety. For caregivers, there were significant decreases in fatigue (d = .89, p = .03) and anxiety (d = .81, p =.04) and some reduction in sleep disturbance (d = .71, p =.08). Class attendance and home practice frequency was not associated with differences seen in symptoms for either patients or caregivers.
A couple-based yoga program was seen as feasible for patients, including those with advanced disease. Medium effect sizes were seen for depressive symptoms and sleep disturbance.
Couple-based yoga sessions were shown to be feasible, and findings suggest that this type of supportive care during radiation therapy may be beneficial in some patients and caregivers for symptoms of fatigue, anxiety, depression, and sleep disturbances. The high drop-out rate suggests that many patients may not be interested or able to participate in such a program, but for those who are interested, it may be helpful. The fact, however, that the number of sessions attended and frequency of home practice were not related to the magnitude of results seen causes one to question whether it was the yoga practice or general support and attention provided that caused effects.
Mustian, K.M., Sprod, L.K., Janelsins, M., Peppone, L.J., Palesh, O.G., Chandwani, K., . . . Morrow, G.R. (2013). Multicenter, randomized controlled trial of yoga for sleep quality among cancer survivors. Journal of Clinical Oncology, 31, 3233–3241.
To determine the effectiveness of a standardized yoga intervention compared to usual care for improving sleep quality among cancer survivors
Patients were stratified by sex and baseline sleep disturbance and randomized to yoga or usual care groups. Patients in the yoga group participated in a program of gentle Hatha yoga and restorative yoga for four weeks. Sessions were provided in community-based sites (e.g., community centers, yoga studios) in groups of 10–15 patients. Study measures were obtained at baseline and at the end of the four-week sessions.
Those assigned to the yoga intervention attended an average of 6.5 of 8 prescribed sessions. Compared to patients in the control group, participants in the yoga program showed greater improvement in global sleep quality (OR 10.79, p = .009), less daytime dysfunction (OR 0.381, p < .001), less sleep medication use (OR 0.561, p = .046), and improvement in subjective sleep quality (OR 0.631, p =.047). Global sleep quality, sleep disturbance, sleep efficiency, and subjective sleep quality also improved in patients in the control group. No significant differences were seen between groups in actigraphy findings.
Participation in group yoga sessions had a positive impact on self-reported sleep quality among cancer survivors.
Findings suggest that participation in group yoga sessions may be effective in improving self-reported sleep quality among cancer survivors. This type of activity may not be acceptable to all patients, given the dropout rates seen in this study. However, for those who are interested in this type of intervention, nurses can let patients know that it can be of benefit.
Rao, R.M., Vadiraja, H.S., Nagaratna, R., Gopinath, K.S., Patil, S., Diwakar, R.B., . . . Nagendra, H.R. (2017). Effect of yoga on sleep quality and neuroendocrine immune response in metastatic breast cancer patients. Indian Journal of Palliative Care, 23, 253–260.
The purpose of this study was to test the effects of a yoga program to determine impact on perceived stress, sleep, diurnal cortisol, and natural killer cell counts in patients with metastatic cancer compared to education and supportive therapy sessions.
Patients with advanced metastatic breast cancer were recruited from a comprehensive cancer center in the medical and radiation outpatient clinics. Consenting patients were randomized to yoga or supportive therapy groups. Providers of oncology care were blinded to group assignment. The yoga program intervention included two sessions a week for 12 weeks. Each session started with a lecture and yoga for 10 minutes followed by 20 minutes of low-impact yoga postures, breathing, and pranayama and relaxation. Then, subjects completed 30 minutes of guided yoga practice by one of two trained instructors. Practicing was encouraged between sessions with instructions and booklets documented in diary logs. The control group completed supportive care sessions, including education and reinforcing social support. Introductory sessions were 60 minutes before starting treatment and during each treatment visit for 15 minutes. Participants could contact counselors at any time with issues or questions. Diary logs were also completed.
Two-arm, prospective randomized control trial
The Pittsburgh Insomnia Rating Scale was used to measure distress related to sleep, sleep parameters, and sleep-related quality of life. Salivary cortisol was measured using oral swab on three consecutive days at three time points. Natural killer cells were collected at baseline and at the end of the study using serum samples to determine immune response. A daily diary was used to document yoga practice in the intervention group and control group.
Of the 91 baseline participants, complete data were analyzed on 66. Reasons for high dropout were listed. No demographic group differences were noted at baseline. Within-group findings included significant decreased distress scores (p = 0.004), decreased sleep distress scores (p = 0.01), improved sleep quality-of-life scores (p = 0.006), improved sleep total distress scores (p = 0.002), decrease in cortisol (p = 0.03), and natural killer cells (p < 0.01) in the yoga group alone. Intervention adherence was 80% attending 24 supervised sessions. Attending more than 20 sessions showed the decreased 9 am cortisol level in the yoga intervention group.
There was evidence to support that yoga could be impacting sleep distress, sleep outcomes, and sleep quality of life, as well as neuroendocrine immune changes providing mechanistic information regarding the benefits of yoga on sleep. Additional research is needed to generalize findings to a wider cancer population.
When recommending yoga as an intervention for sleep, there is a potential impact on subjective sleep outcomes, quality of life, and neuroendocrine responses such as immune function and cortisol levels.