Yoga as a Therapy for Adolescents and Young Adults With Cystic Fibrosis: A Pilot Study

Abstract

摘要

SINOPSIS

INTRODUCTION

Cystic fibrosis (CF) is a multisystem, life-shortening, inherited disease that affects approximately 30,000 children and adults in the United States and 70,000 worldwide. Chronic lung disease is the main cause of morbidity and mortality in CF.¹ Despite advances in medical therapy, patients with CF continue to suffer from declining lung function and health-related quality of life (HRQoL).^2,3 Interventions that address not only specific organ problems but also overall HRQoL of CF patients are needed.

The practice of yoga involves breathing, stretching, strengthening, and meditation activities. Yoga programs focus not only on physical fitness but also on control of breathing and stress reduction. These activities are typically done in a structured setting with an instructor and can then be easily incorporated into a patient’s daily living. Research suggests benefits of yoga for various diseases including respiratory, musculoskeletal, and mental health conditions as well as diabetes.^4–8 In the realm of pulmonary diseases, evidence supports the efficacy of yoga in adults and children with asthma^9–12 and adults with chronic obstructive pulmonary disease (COPD).⁴ Yoga has the potential to be beneficial for patients with CF by impacting many aspects of their disease; however, yoga has not previously been investigated in patients with CF.¹³ There are several potential mechanisms by which yoga may benefit patients with CF, including improved airway clearance secondary to deep-breathing exercises and strengthening of respiratory muscles. The potential psychosomatic effects of yoga include stress reduction and an improved sense of wellbeing.

This primary aim of this study was to evaluate safety and tolerability of yoga in CF patients. We hypothesized that a standardized 8-week yoga program would be safe and well tolerated by CF patients. We also evaluated secondary exploratory outcome measures including quality of life, lung function, exercise tolerance, and weight.

METHODS

This was a prospective, single center, pilot study of a standardized yoga program among CF patients aged 12 to 25 years. The study was done in accordance with and approved by the Seattle Children’s Hospital Institutional Review Board (approval number 13424). The main objective was evaluation of safety and tolerability. Secondary exploratory outcome measures included 2 CF-specific HRQoL instruments, the Cystic Fibrosis Quality of Life instrument (CFQ-R)¹⁴ and the CF Respiratory Symptom Diary (CFRSD).¹⁵ Other secondary outcome measures included FEV₁ (forced expiratory volume in 1 sec), single breath Ease of Breathing Score (EOBS, a measure of exercise tolerance),¹⁶ and weight.

Recruitment was done by the research staff by approaching patients in CF clinic and also by a mailed letter informing patients about the study. Patients aged 12 to 25 years with a diagnosis of CF were eligible to enroll if their FEV₁ was >40% predicted at screening (ie, mild to moderate lung disease) and if they provided informed consent. Patients were excluded if they had wheezing or oxygen saturation <90% at screening or if they had initiated antibiotic treatment for an acute respiratory infection within 2 weeks prior to screening. Patients were also excluded due to pregnancy, history of lung transplant, or current enrollment in a therapeutic clinical trial. Patients who had regularly practiced yoga (≥1 time per week) in the month prior to enrollment also were excluded.

Eligible patients were scheduled for a 50-minute yoga session 2 times per week for 8 weeks. Each yoga session was conducted in the Pediatric Clinical Research Center (PCRC) and included only a single participant to avoid the possibility of transmission of infection, as infection among CF patients may be transmitted by contact.

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¹⁷ The sessions were designed by the lead yoga instructor in conjunction with the CF research staff. Yoga sessions are summarized by week in Table 1. The yoga sessions included postures and breathing exercises and were conducted by 4 certified yoga instructors who followed a standardized and structured program to ensure consistency. Importantly, yoga sessions were designed to be safe for a health compromised audience. Home practice was neither encouraged nor discouraged.

Data were collected on all participants at a screening study visit before starting the yoga sessions and an end-of-study visit after completing 8 weeks of yoga sessions. At each of the 2 study visits, the following procedures were performed: vital signs, abbreviated physical exam, spirometry, EOBS, and CFQ-R. At screening and weekly during the intervention, each subject recorded their respiratory symptoms using the CFRSD. Before and after each yoga session, assessments of safety and tolerability were obtained.

Safety and tolerability assessment was comprised of monitoring of vital signs, patient rating of pain and dyspnea, occurrence of adverse events, and adherence to yoga sessions. Vital signs (heart rate, diastolic and systolic blood pressure, and respiratory rate) and oxygen saturation in room air were obtained at each of the 2 study visits. Vital signs and oxygen saturation in room air were also obtained before and after the first 3 yoga sessions. Before beginning each yoga session, participants completed a questionnaire asking about new respiratory symptoms. Chest pain, musculoskeletal pain, and dyspnea were assessed by pain and dyspnea scales before and after each session. If participants reported new respiratory symptoms or rated their degree of dyspnea, chest pain, or musculoskeletal pain in the severe range, the research coordinator or physician was contacted. An adverse event was defined as any medical problem experienced by a participant during the study that was an adverse change from baseline. Potential adverse events related to the practice of yoga were judged to include musculoskeletal adverse experiences including soreness or achiness as a result of the increased use of muscles, and less likely, sprains or strains. Patients with CF often mobilize secretions with activity leading to increased cough and mild dyspnea. Therefore, we felt that it was likely that participants might experience cough or dyspnea during or after a yoga session. Relatedness of any adverse event to study procedures was determined by the principal investigator, and all adverse events were documented in the adverse event log.

Data were summarized using descriptive statistics. Reference equations of Wang¹⁸ and Hankinson¹⁹ were used to calculate FEV₁ percentage–predicted values. Differences in outcome measures between screening and end-of-study visits were analyzed by 2-sided paired sample sign tests (CFQ-R and CFRSD scores) or paired t-tests (lung function, EOBS, and weight). The sample size was based on feasibility constraints for a pilot study rather than statistical power considerations. Analyses were performed using Stata (Release 12.1, College Station, Texas).

RESULTS

Eleven participants, 9 females and 2 males, were enrolled, and 10 completed the study. All were white. Mean (SD) age, FEV₁ percentage–predicted, and body mass index (BMI) were 20.6 (3.9) years, 86.3% (17.0), and 22.7 (2.9), respectively. Adherence to the study protocol was very good: the mean (SD) number of sessions completed was 14.2 (1.3) out of 16 sessions. There were a total of 25 adverse events reported in 8 participants. The most common adverse event reported was cough in 7 (64%) participants. Musculoskeletal pain was reported by 3 individuals. Of the 25 adverse events, only 2 were possibly related to study procedures; those were headache and calf pain and were of mild severity. There were 10 (40%) adverse events of moderate severity, all unrelated to study procedures. There were 2 (8%) serious adverse events (hemoptysis and pulmonary exacerbation); both occurred after enrollment but prior to starting yoga sessions and were unrelated to study procedures. There were no significant changes in the pain or dyspnea scales before and after yoga sessions throughout the study.

Results of the CFQ-R questionnaire at the beginning and end of the study are summarized in Table 2. There was a significant improvement in the mean (SD) CFQ-R respiratory domain score from screening to end of study (67.9 [11.4] to 82.1 [9.9], P=.04). There were no significant changes in the other CFQ-R domain scores, the CFRSD self-reported respiratory symptom score, FEV₁, weight, or EOBS.

DISCUSSION

To our knowledge, this is the first study to evaluate yoga in CF patients. Our primary objective was to evaluate the safety and tolerability of yoga in adolescents and young adults with CF. In this small pilot study, a standardized 8-week yoga program was safe and well tolerated. One event each of calf pain and headache were reported as possibly related to the yoga sessions but did not require intervention or result in cessation of yoga sessions. The participants’ rating of dyspnea and pain did not change over the study period. Importantly, this study followed US CF Foundation infection control guidelines¹⁷ prohibiting individuals with CF from being in the same room in order to prevent transmission of respiratory bacteria between patients. When considering a yoga program for patients with CF, it is of utmost importance that the sessions are individual or that no more than 1 CF patient attends a given session. In addition, this study evaluated CF patients with mild to moderate lung disease (as measured by their FEV₁). Our results may not be generalizable in patients with more advanced disease.

Yoga has been shown to improve quality of life in other obstructive lung diseases such as asthma,²⁰ and quality of life has been found to be associated with other types of physical activity in CF patients.²¹ While our study had limited power to detect an effect of yoga on outcomes, we did see a significant improvement in the Respiratory Domain of the CFQ-R health-related quality of life instrument.

An important finding of this study is that during this 8-week yoga program, the adherence to the twice-weekly yoga sessions was very good. This is at least partly due to the fact that the yoga instructors were well informed about CF prior to the study and the yoga sessions were standardized and designed to be safe.

CONCLUSIONS

This pilot study of a standardized 8-week yoga program in CF adolescents and young adults was safe and well tolerated. Yoga may be considered for CF patients with mild to moderate lung disease. It is suggested that CF patients discuss the potential risks and benefits of yoga with their CF healthcare providers before starting a yoga program. Yoga sessions should include only 1 CF patient due to the possibility of transmitting infection. We hope that this study may be helpful to yoga instructors who are interested in working with CF patients. Larger controlled trials are warranted to determine further benefits of yoga for CF patients.

Acknowledgments

Notes

Disclosures The authors completed the ICMJE Form for Disclosure of Potential Conflicts of Interest and had no conflicts to disclose.

Funding Grant funding awarded by Firland Foundation, Shoreline, Washington. Firland Foundation had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript. Trial registration identification number: ClinicalTrials.gov, NCT01325766

Contributor Information

Jennifer Ruddy, Department of Pediatrics, ProMedica Toledo Children’s Hospital, Ohio (Dr Ruddy), United States.

Julia Emerson, Department of Pediatrics, Seattle Children’s Hospital, University of Washington (Dr Emerson), United States.

Sharon McNamara, Department of Pediatrics, Seattle Children’s Hospital, University of Washington (Dr McNamara), United States.

Alan Genatossio, Department of Pediatrics, Seattle Children’s Hospital, University of Washington (Mr Genatossio), United States.

Cora Breuner, Department of Pediatrics, Seattle Children’s Hospital, University of Washington (Dr Breuner), United States.

Tracy Weber, Whole Life Yoga, Seattle, Washington (Ms Weber), United States.

Margaret Rosenfeld, Department of Pediatrics, Seattle Children’s Hospital, University of Washington (Dr Rosenfeld), United States.

REFERENCES