Margaret L. McNeely

Effects of exercise on breast cancer patients and survivors: a systematic review and meta-analysis

Background: Physical exercise has been identified as a potential intervention to improve quality of life in women with breast cancer. We sought to summarize the available evidence concerning the effects of exercise on breast cancer patients and survivors. Methods: We searched the Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, CINAHL, PsychINFO, CancerLit, PEDro and SportDiscus as well as conference proceedings, clinical practice guidelines and other unpublished literature resources. We included only randomized controlled trials that examined exercise interventions for breast cancer patients or survivors with quality of life, cardiorespiratory fitness or physical functioning as primary outcomes. We also extracted data on symptoms of fatigue, body composition and adverse effects. Results: Of 136 studies identified, 14 met all the inclusion criteria. Despite significant heterogeneity and relatively small samples, the point estimates in terms of the benefits of exercise for all outcomes were positive even when statistical significance was not achieved. Exercise led to statistically significant improvements in quality of life as assessed by the Functional Assessment of Cancer Therapy–General (weighted mean difference [WMD] 4.58, 95% confidence interval [CI] 0.35 to 8.80) and Functional Assessment of Cancer Therapy–Breast (WMD 6.62, 95% CI 1.21 to 12.03). Exercise also led to significant improvements in physical functioning and peak oxygen consumption and in reducing symptoms of fatigue. Interpretation: Exercise is an effective intervention to improve quality of life, cardiorespiratory fitness, physical functioning and fatigue in breast cancer patients and survivors. Larger trials that have a greater focus on study quality and adverse effects and that examine the long-term benefits of exercise are needed for this patient group.

Randomized Controlled Trial of the Effects of Aerobic Exercise on Physical Functioning and Quality of Life in Lymphoma Patients

PURPOSE Lymphoma patients commonly experience declines in physical functioning and quality of life (QoL) that may be reversed with exercise training. PATIENTS AND METHODS We conducted a randomized controlled trial in Edmonton, Alberta, Canada, between 2005 and 2008 that stratified 122 lymphoma patients by major disease type and current treatment status and randomly assigned them to usual care (UC; n = 62) or 12 weeks of supervised aerobic exercise training (AET; n = 60). Our primary end point was patient-rated physical functioning assessed by the Trial Outcome Index-Anemia. Secondary end points were overall QoL, psychosocial functioning, cardiovascular fitness, and body composition. RESULTS Follow-up assessment for our primary end point was 96% (117 of 122) at postintervention and 90% (110 of 122) at 6-month follow-up. Median adherence to the supervised exercise program was 92%. At postintervention, AET was superior to UC for patient-rated physical functioning (mean group difference, +9.0; 95% CI, 2.0 to 16.0; P = .012), overall QoL (P = .021), fatigue (P = .013), happiness (P = .004), depression (P = .005), general health (P < .001), cardiovascular fitness (P < .001), and lean body mass (P = .008). Change in peak cardiovascular fitness mediated the change in patient-rated physical functioning. AET did not interfere with chemotherapy completion rate or treatment response. At 6-month follow-up, AET was still borderline or significantly superior to UC for overall QoL (P = .054), happiness (P = .034), and depression (P = .009) without an increased risk of disease recurrence/progression. CONCLUSION AET significantly improved important patient-rated outcomes and objective physical functioning in lymphoma patients without interfering with medical treatments or response. Exercise training to improve cardiovascular fitness should be considered in the management of lymphoma patients.

The Addition of Manual Lymph Drainage to Compression Therapy For Breast Cancer Related Lymphedema: a Randomized Controlled Trial

AbstractPurpose. The purpose of this investigation was to compare the reduction in arm lymphedema volume achieved from manual lymph drainage massage (MLD) in combination with multi-layered compression bandaging (CB) to that achieved by CB alone. Methods and materials. Fifty women with lymphedema (mean age of 59 years ± 13 years) were randomly assigned to 4 weeks of combined MLD/CB or CB alone. The primary study endpoint was the reduction in arm lymphedema volume, which was determined by water displacement volumetry and measurement of circumference. Independent assessors, blinded to subject treatment assignment, performed the outcome measurements. Results. Arm lymphedema volume decreased significantly after 4 weeks irrespective of treatment assignment (p < 0.001). Individuals with mild lymphedema receiving combined MLD/CB had a significantly larger percentage reduction in volume compared to individuals with mild lymphedema receiving CB alone, and compared to individuals with moderate or severe lymphedema receiving either treatment. Conclusion. These findings indicate that CB, with or without MLD, is an effective intervention in reducing arm lymphedema volume. The findings suggest that CB on its own should be considered as a primary treatment option in reducing arm lymphedema volume. There may be an additional benefit from the application of MLD for women with mild lymphedema; however, this finding will need to be further examined in the research setting.

Alberta Physical Activity and Breast Cancer Prevention Trial: Sex Hormone Changes in a Year-Long Exercise Intervention Among Postmenopausal Women

PURPOSE We examined how an aerobic exercise intervention influenced circulating estradiol, estrone, sex hormone-binding globulin (SHBG), androstenedione, and testosterone levels, which may be involved in the association between physical activity and breast cancer risk. METHODS A two-center, two-arm randomized controlled trial of exercise was conducted in 320 postmenopausal, sedentary women age 50 to 74 years. Participants were randomly assigned to a 1-year aerobic exercise intervention of 225 min/wk (n = 160) or to a control group who maintained their usual level of activity (n = 160). Baseline, 6-month, and 12-month assessments of estrone, estradiol, androstenedione, and testosterone were quantified by radioimmunoassay after extraction, and SHBG was quantified by an immunometric assay. Intent-to-treat analyses were performed using linear mixed models. RESULTS Blood data were available on 309 women (96.6%) at 12 months. Women in the intervention group exercised an average of 3.6 d/wk for 178 min/wk. At 12 months, statistically significant reductions in estradiol (treatment effect ratio [TER] = 0.93; 95% CI, 0.88 to 0.98) and free estradiol (TER = 0.91; 95% CI, 0.87 to 0.96) and increases in SHBG (TER = 1.04; 95% CI, 1.02 to 1.07) were observed in the exercise group compared with the control group. No significant differences in estrone, androstenedione, and testosterone levels were observed between exercisers and controls at 12 months. CONCLUSION This trial found that previously sedentary postmenopausal women can adhere to a moderate- to vigorous-intensity exercise program that results in changes in estradiol and SHBG concentrations that are consistent with a lower risk for postmenopausal breast cancer.

Effect of Exercise on Upper Extremity Pain and Dysfunction in Head and Neck Cancer Survivors A Randomized Controlled Trial

Shoulder pain and disability are well recognized complications associated with surgery for head and neck cancer. This study was designed to examine the effects of progressive resistance exercise training (PRET) on upper extremity pain and dysfunction in postsurgical head and neck cancer survivors.

Changes in insulin resistance indicators, IGFs, and adipokines in a year-long trial of aerobic exercise in postmenopausal women

Physical activity is a known modifiable lifestyle means for reducing postmenopausal breast cancer risk, but the biologic mechanisms are not well understood. Metabolic factors may be involved. In this study, we aimed to determine the effects of exercise on insulin resistance (IR) indicators, IGF1, and adipokines in postmenopausal women. The Alberta Physical Activity and Breast Cancer Prevention Trial was a two-armed randomized controlled trial in postmenopausal, inactive, cancer-free women. A year-long aerobic exercise intervention of 225 min/week (n=160) was compared with a control group asked to maintain usual activity levels (n=160). Baseline, 6- and 12-month serum levels of insulin, glucose, IGF1, IGF-binding protein 3 (IGFBP3), adiponectin, and leptin were assayed, and after data collection, homeostasis model assessment of IR (HOMA-IR) scores were calculated. Intention-to-treat analyses were performed using linear mixed models. The treatment effect ratio (TER) of exercisers to controls was calculated. Data were available on 308 (96.3%) women at 6 months and 310 (96.9%) women at 12 months. Across the study period, statistically significant reductions in insulin (TER=0.87, 95% confidence interval (95% CI)=0.81–0.93), HOMA-IR (TER=0.86, 95% CI=0.80–0.93), and leptin (TER=0.82, 95% CI=0.78–0.87), and an increase in the adiponectin/leptin ratio (TER=1.21, 95% CI=1.13–1.28) were observed in the exercise group compared with the control group. No significant differences were observed for glucose, IGF1, IGFBP3, adiponectin or the IGF1/IGFBP3 ratio. Previously inactive postmenopausal women who engaged in a moderate-to-vigorous intensity exercise program experienced changes in insulin, HOMA-IR, leptin, and adiponectin/leptin that might decrease the risk for postmenopausal breast cancer.

Adiposity changes after a 1-year aerobic exercise intervention among postmenopausal women: a randomized controlled trial

Objective:We examined the effects of an aerobic exercise intervention on adiposity outcomes that may be involved in the association between physical activity and breast cancer risk.Design:This study was a two-centre, two-armed, randomized controlled trial. The 1-year-long exercise intervention included 45 min of moderate-to-vigorous aerobic exercise five times per week, with at least three of the sessions being facility based. The control group was asked not to change their activity and both groups were asked not to change their diet.Subjects:A total of 320 postmenopausal, sedentary, normal weight-to-obese women aged 50–74 years who were cancer-free, nondiabetic and nonhormone replacement therapy users were included in this study.Measurements:Anthropometric measurements of height, weight and waist and hip circumferences; dual energy X-ray absorptiometry measurements of total body fat; and computerized tomography measurements of abdominal adiposity were carried out.Results:Women in the exercise group exercised a mean of 3.6 days (s.d.=1.3) per week and 178.5 min (s.d.=76.1) per week. Changes in all measures of adiposity favored exercisers relative to controls (P<0.001). The mean difference between groups was: −1.8 kg for body weight; −2.0 kg for total body fat; −14.9 cm2 for intra-abdominal fat area; and −24.1 cm2 for subcutaneous abdominal fat area. A linear trend of greater body fat loss with increasing volume of exercise was also observed.Conclusion:A 1-year aerobic exercise program consistent with current public health guidelines resulted in reduced adiposity levels in previously sedentary postmenopausal women at higher risk of breast cancer.

A pilot study of a randomized controlled trial to evaluate the effects of progressive resistance exercise training on shoulder dysfunction caused by spinal accessory neurapraxia/neurectomy in head and neck cancer survivors

Shoulder dysfunction remains a frequent complication after neck dissection procedures for head and neck cancer.

Randomized Trial of Decongestive Lymphatic Therapy for the Treatment of Lymphedema in Women With Breast Cancer

PURPOSE Because of its morbidity and chronicity, arm lymphedema remains a concerning complication of breast cancer treatment. Although massage-based decongestive therapy is often recommended, randomized trials have not consistently demonstrated benefit over more conservative measures. PATIENTS AND METHODS Women previously treated for breast cancer with lymphedema were enrolled from six institutions. Volumes were calculated from circumference measurements. Patients with a minimum of 10% volume difference between their arms were randomly assigned to either compression garments (control) or daily manual lymphatic drainage and bandaging followed by compression garments (experimental). The primary outcome was percent reduction in excess arm volume from baseline to 6 weeks. RESULTS A total of 103 women were randomly assigned, and 95 were evaluable. Mean reduction of excess arm volume was 29.0% in the experimental group and 22.6% in the control group (difference, 6.4%; 95% CI, -6.8% to 20.5%; P = .34). Absolute volume loss was 250 mL and 143 mL in the experimental and control groups, respectively (difference, 107 mL; 95% CI, 13 to 203 mL; P = .03). There was no difference between groups in the proportion of patients losing 50% or greater excess arm volume. Quality of life (Short Form-36 Health Survey) and arm function were not different between groups. CONCLUSION This trial was unable to demonstrate a significant improvement in lymphedema with decongestive therapy compared with a more conservative approach. The failure to detect a difference may have been a result of the relatively small size of our trial.

Clinical practice guidelines for breast cancer rehabilitation: syntheses of guideline recommendations and qualitative appraisals.

Despite strides in early detection and management of breast cancer, the primary treatments for this disease continue to result in physical impairments for some of the nearly 3 million people diagnosed annually. Over the past decade, evidence‐based clinical practice guidelines (CPGs) have been developed with goals of preventing and ameliorating these impairments. However, translation of these guidelines into clinical practice needs to be accelerated.