Weight lifting in women with breast-cancer-related lymphedema

The evolution of mindfulness-based physical interventions in breast cancer survivors

Survivors of breast cancer are faced with a multitude of medical and psychological impairments during and after treatment and throughout their lifespan. Physical exercise has been shown to improve survival and recurrence in this population. Mind-body interventions combine a light-moderate intensity physical exercise with mindfulness, thus having the potential to improve both physical and psychological sequelae of breast cancer treatments. We conducted a review of mindfulness-based physical exercise interventions which included yoga, tai chi chuan, Pilates, and qigong, in breast cancer survivors. Among the mindfulness-based interventions, yoga was significantly more studied in this population as compared to tai chi chuan, Pilates, and qigong. The participants and the outcomes of the majority of the studies reviewed were heterogeneous, and the population included was generally not selected for symptoms. Yoga was shown to improve fatigue in a few methodologically strong studies, providing reasonable evidence for benefit in this population. Improvements were also seen in sleep, anxiety, depression, distress, quality of life, and postchemotherapy nausea and vomiting in the yoga studies. Tai chi chuan, Pilates, and qigong were not studied sufficiently in breast cancer survivors in order to be implemented in clinical practice.

Implementing the exercise guidelines for cancer survivors

In 2009, the American College of Sports Medicine convened an expert roundtable to issue guidelines on exercise for cancer survivors. This multidisciplinary group evaluated the strength of the evidence for the safety and benefits of exercise as a therapeutic intervention for survivors. The panel concluded that exercise is safe and offers myriad benefits for survivors including improvements in physical function, strength, fatigue, quality of life, and possibly recurrence and survival. Recommendations for situations in which deviations from the US Physical Activity Guidelines for Americans are appropriate were provided. Here, we outline a process for implementing the guidelines in clinical practice and provide recommendations for how the oncology care provider can interface with the exercise and physical therapy community.

The role of obesity in cancer survival and recurrence

Obesity and components of energy imbalance, that is, excessive energy intake and suboptimal levels of physical activity, are established risk factors for cancer incidence. Accumulating evidence suggests that these factors also may be important after the diagnosis of cancer and influence the course of disease, as well as overall health, well-being, and survival. Lifestyle and medical interventions that effectively modify these factors could potentially be harnessed as a means of cancer control. However, for such interventions to be maximally effective and sustainable, broad sweeping scientific discoveries ranging from molecular and cellular advances, to developments in delivering interventions on both individual and societal levels are needed. This review summarizes key discussion topics that were addressed in a recent Institute of Medicine Workshop entitled, "The Role of Obesity in Cancer Survival and Recurrence"; discussions included (i) mechanisms associated with obesity and energy balance that influence cancer progression; (ii) complexities of studying and interpreting energy balance in relation to cancer recurrence and survival; (iii) associations between obesity and cancer risk, recurrence, and mortality; (iv) interventions that promote weight loss, increased physical activity, and negative energy balance as a means of cancer control; and (v) future directions.

Pilates for breast cancer survivors

Pilates has been advocated for rehabilitation of breast cancer survivors despite little scientific evidence. The authors of this article have examined the feasibility of a Pilates program in postmastectomy breast cancer survivors and the impact on physical and psychological parameters. Fifteen breast cancer survivors were recruited in a one-arm study of 12 weeks of Pilates exercises. The authors assessed recruitment, adherence, and attrition, and measured changes in shoulder and neck range of motion, posture, height, arm volume, quality of life, mood, and body image from pre- to postintervention. Of 26 eligible patients, 15 enrolled, 13 completed the study, and 10 performed more than 50% of the recommended sessions. Statistically significant improvements emerged for shoulder abduction and internal rotation on the affected side, neck rotation toward the unaffected side, and neck flexion. The affected side arm volume and the interlimb volume discrepancy increased. Significant improvements were reported in quality of life, mood, and body image. The improvements in physical and psychological outcomes are promising and deserve further evaluation in a randomized, controlled study. The increase in affected arm volume also warrants additional investigation.

Safety of weightlifting among women with or at risk for breast cancer-related lymphedema: musculoskeletal injuries and health care use in a weightlifting rehabilitation trial

INTRODUCTION

It has been noted that only 14% of all clinical trials are translated into practice. The objective of this paper is to promote translation of an efficacious rehabilitative exercise program for breast cancer survivors by clarifying for clinicians the safety profile of participants (e.g., rates of musculoskeletal injury and referral to medical professionals), and to use this evidence to make recommendations on the appropriate training of health and fitness staff who would be capable of safely, effectively, and sustainably delivering the program.

METHODS

Breast cancer survivors with and at risk for lymphedema were randomized to twice-weekly weightlifting or standard care for 1 year. An injury survey and health care evaluation were administered after 1 year and in 3-month intervals, respectively.

RESULTS

The cumulative incidence and rate of injury were higher in the weightlifting than in the control group. The injury rates were 2.3 and 0.3 per 1,000 bouts of weightlifting among breast cancer survivors with and at risk for lymphedema, respectively. Among breast cancer survivors with or at risk for lymphedema, 20.9% in the weightlifting group had an encounter with a health care provider that required cessation or dose modification of weightlifting.

CONCLUSION

Despite the demonstrated efficacy of weightlifting, musculoskeletal injuries and other health problems did occur. Therefore, for the successful translation of this rehabilitative intervention into clinical practice, health and fitness professionals working with breast cancer survivors need the knowledge, skills, and abilities that clarify their scope of practice to address these health care needs.

Nutrition and physical activity guidelines for cancer survivors

Cancer survivors are often highly motivated to seek information about food choices, physical activity, and dietary supplements to improve their treatment outcomes, quality of life, and overall survival. To address these concerns, the American Cancer Society (ACS) convened a group of experts in nutrition, physical activity, and cancer survivorship to evaluate the scientific evidence and best clinical practices related to optimal nutrition and physical activity after the diagnosis of cancer. This report summarizes their findings and is intended to present health care providers with the best possible information with which to help cancer survivors and their families make informed choices related to nutrition and physical activity. The report discusses nutrition and physical activity guidelines during the continuum of cancer care, briefly highlighting important issues during cancer treatment and for patients with advanced cancer, but focusing largely on the needs of the population of individuals who are disease free or who have stable disease following their recovery from treatment. It also discusses select nutrition and physical activity issues such as body weight, food choices, food safety, and dietary supplements; issues related to selected cancer sites; and common questions about diet, physical activity, and cancer survivorship.

"We're All in the Same Boat": A Review of the Benefits of Dragon Boat Racing for Women Living with Breast Cancer

This narrative review summarizes findings from quantitative and qualitative research literature that has been published over the past 15 years since an initial, community-based pilot study first challenged the long-held medical belief that vigorous, upper-body exercise would lead to lymphedema in women who were at risk due to treatments for breast cancer. Dragon boat racing originated in China more than 2000 years ago and has become a popular recreational and competitive support around the world. From the advent of the world's first breast cancer survivor dragon boat team, Abreast in a Boat launched in Vancouver, British Columbia, in 1996, there are now more than 140 breast cancer survivor dragon boat teams paddling and competing in 12 different countries. The wealth of quantitative and qualitative research that has ensued since that pilot study further supports the initial hypothesis that resistance exercise, for example, dragon boat paddling, is not only safe for women recovering from conventional breast cancer therapies but also shows that dragon boating has been embraced as a complementary exercise therapy by the cancer survivors participating in this magical sport.

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

BACKGROUND

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.

METHODS

Relevant health science databases (2001-2011) were searched to identify CPGs on breast cancer rehabilitation for the following impairments: upper extremity restrictions, lymphedema, pain, fatigue, chemotherapy-induced peripheral neuropathy, treatment-related cardiotoxicity, bone health, and weight management.

RESULTS

Recommendations from 19 relevant CPGs were first summarized by impairment within tables; commonalities across guidelines, within each impairment, were then synthesized within the article. The CPGs were rated using the Appraisal of Guidelines for Research and Evaluation II (AGREE II); wide variability was noted in rigor of development, clarity of presentation, and stakeholder involvement. The most rigorous and comprehensive of those rated was the adult cancer pain guideline from the Scottish Intercollegiate Guidelines Network.

CONCLUSIONS

Based on a large body of evidence published in recent years, including randomized trials and systematic reviews, there is an urgent need for updating the guidelines on upper extremity musculoskeletal impairments and lymphedema. Furthermore, additional research is needed to provide an evidence base for developing rehabilitation guidelines on management of other impairments identified in the prospective surveillance model, eg, arthralgia.

Prevalence of breast cancer treatment sequelae over 6 years of follow-up: the Pulling Through Study

BACKGROUND

There is a need to better describe and understand the prevalence of breast cancer treatment-related adverse effects amenable to physical therapy and rehabilitative exercise. Prior studies have been limited to single issues and lacked long-term follow-up. The Pulling Through Study provides data on prevalence of adverse effects in breast cancer survivors followed over 6 years.

METHODS

A population-based sample of Australian women (n = 287) diagnosed with invasive, unilateral breast cancer was followed for a median of 6.6 years and prospectively assessed for treatment-related complications at 6, 12, and 18 months and 6 years after diagnosis. Assessments included postsurgical complications, skin or tissue reaction to radiation therapy, upper-body symptoms, lymphedema, 10% weight gain, fatigue, and upper-quadrant function. The proportion of women with positive indication for each complication and 1 or more complication was estimated using all available data at each time point. Women were only considered to have a specific complication if they reported the highest 2 levels of the Likert scale for self-reported issues.

RESULTS

At 6 years after diagnosis, more than 60% of women experienced 1 or more side effects amenable to rehabilitative intervention. The proportion of women experiencing 3 or more side effects decreased throughout follow-up, whereas the proportion experiencing no side effects remained stable around 40% from 12 months to 6 years. Weight gain was the only complication to increase in prevalence over time.

CONCLUSIONS

These data support the development of a multidisciplinary prospective surveillance approach for the purposes of managing and treating adverse effects in breast cancer survivors.

A prospective model of care for breast cancer rehabilitation: function

A significant proportion of adult breast cancer survivors experience deficits in function and restriction in participation in life roles that may remain many years after diagnosis. Function is a complex construct that takes into account the interactions between an individual, their health condition, and the social and personal context in which they live. Research to date on limitations in activities of daily living, upper extremity function, and functional capacity in breast cancer survivors illustrates the need for prospective measurement of function using measures that are sensitive to the unique issues of breast cancer survivors and the need for the development of effective rehabilitation interventions to improve function. Limitations in function have a significant impact on quality of life, but less is known about the implications on return to work and survival, as well as the impact of other comorbidities and aging on the function limitations in breast cancer survivors. This review provides a rationale for the integration of measures of function into breast cancer care to more fully appreciate the functional limitations associated with breast cancer diagnosis and treatment and to aid in the development of better rehabilitation care for breast cancer survivors.

Patient perspectives on breast cancer treatment side effects and the prospective surveillance model for physical rehabilitation for women with breast cancer

Women's experience of breast cancer is complex, affecting all aspects of life during and after treatment. Patients' perspectives about common impairments and functional limitations secondary to breast cancer treatment, including upper extremity motion restriction, lymphedema, fatigue, weight gain, pain, and chemotherapy-induced peripheral neuropathy, are addressed. Women often report being uninformed regarding these side effects and surprised that they do not always disappear after treatment, but remain part of their lives. Breast cancer patients express strong, unmet needs for education, information, and intervention for these side effects. Evidence suggests that rehabilitation and exercise are effective in preventing and managing many physical side effects of breast cancer treatment. Nevertheless, few women are referred to rehabilitation during or after treatment, and fewer receive baseline assessments of impairment and function to facilitate early detection of impairment and functional limitations. The prospective surveillance model of rehabilitation will serve the needs of women with breast cancer by providing education and information about treatment side effects, reducing the incidence and burden of side effects through early identification and treatment, and enhancing access to timely rehabilitation. Integration of exercise as a component of the model benefits patients at every phase of survivorship, by addressing individual concerns about exercise during and after treatment and highlighting the important contribution of exercise to overall health and survival. The prospective surveillance model of rehabilitation can meet the evident and often expressed needs of survivors for information, guidance, and intervention--thus addressing, and potentially improving, overall quality of life for individuals diagnosed with and treated for breast cancer.

The effect of yoga on women with secondary arm lymphoedema from breast cancer treatment

Background

Women who develop secondary arm lymphoedema subsequent to treatment associated with breast cancer require life-long management for a range of symptoms including arm swelling, heaviness, tightness in the arm and sometimes the chest, upper body impairment and changes to a range of parameters relating to quality of life. While exercise under controlled conditions has had positive outcomes, the impact of yoga has not been investigated. The aim of this study is to determine the effectiveness of yoga in the physical and psycho-social domains, in the hope that women can be offered another safe, holistic modality to help control many, if not all, of the effects of secondary arm lymphoedema.

Methods and design

A randomised controlled pilot trial will be conducted in Hobart and Launceston with a total of 40 women receiving either yoga intervention or current best practice care. Intervention will consist of eight weeks of a weekly teacher-led yoga class with a home-based daily yoga practice delivered by DVD. Primary outcome measures will be the effects of yoga on lymphoedema and its associated symptoms and quality of life. Secondary outcome measures will be range of motion of the arm and thoracic spine, shoulder strength, and weekly and daily physical activity. Primary and secondary outcomes will be measured at baseline, weeks four, eight and a four week follow up at week twelve. Range of motion of the spine, in a self-nominated group, will be measured at baseline, weeks eight and twelve. A further outcome will be the women’s perceptions of the yoga collected by interview at week eight.

Discussion

The results of this trial will provide information on the safety and effectiveness of yoga for women with secondary arm lymphoedema from breast cancer treatment. It will also inform methodology for future, larger trials.

Trial registration

ACTRN12611000202965

Factors that affect decisions about physical activity and exercise in survivors of breast cancer: a qualitative study

BACKGROUND

Exercise has many benefits for survivors of breast cancer, yet only half of this population regularly exercise. Fear has been identified as a barrier to exercise for people with neuromusculoskeletal conditions but has been minimally explored in women with breast cancer.

OBJECTIVES

The purposes of this study were: (1) to investigate factors that affected decisions about physical activity and exercise in survivors of breast cancer and (2) to determine whether fear was a factor.

DESIGN

This investigation was a grounded-theory qualitative study. Qualitative data were triangulated with data from 2 quantitative scales that measured participants' beliefs about exercise and their activity levels.

METHODS

Thirty-four survivors of breast cancer in 8 focus groups participated in semistructured interviews that were recorded, transcribed, and coded. Concept maps created for each group were merged to develop themes. Beliefs about physical activity and exercise were assessed with the Decisional Balance Scale. The Rapid Assessment of Physical Activity was used to assess behaviors regarding physical activity and exercise before and after the breast cancer diagnosis.

RESULTS

Participants generally believed that exercise was beneficial (Decisional Balance Scale score: X=28.1 [of a maximum score of 44], SD=7.6, range=10-43). Participants decreased the amount of physical activity or exercise during treatment but increased the amount of exercise beyond prediagnosis levels after treatment (Rapid Assessment of Physical Activity score: median=6, range=2-7). Three prominent themes described participants' behaviors regarding physical activity or exercise: values and beliefs about exercise, facilitators and barriers that were both similar to those affecting the general population and cancer specific, and lack of or inaccurate information about safe exercise.

CONCLUSIONS

Survivors who were active were not afraid to exercise. However, concern about lymphedema and knowledge about safe and effective exercise programs influenced choices regarding physical activity and exercise.

A prospective study of breast lymphedema: frequency, symptoms, and quality of life

Although lymphedema of the arm is a well-known complication of breast and axillary surgery, breast lymphedema has received scant attention. We sought to prospectively characterize breast lymphedema's incidence, associated symptoms, clinical course, and impact on quality of life. Subjects were enrolled prospectively from a consecutive sample of patients undergoing non-mastectomy breast procedures (excisional biopsy or wide local excision ± lymph node removal) and followed for signs and symptoms of lymphedema in the operated breast. Symptoms and distress were serially assessed with 11-point linear analog scales. Breast lymphedema was diagnosed independent of symptoms, based on the distribution and degree of edema and erythema. One hundred twenty-four women were followed for a median of 11 months, and breast lymphedema was diagnosed in 38 (31%) women. Breast lymphedema was more frequent after breast surgery with axillary node removal (49%) compared to breast surgery alone (0%), p < 0.0001. Breast lymphedema involved multiple quadrants in most women and was characterized by edema in 100% and erythema in 79%. Patients with breast lymphedema were significantly more likely than women without breast lymphedema to report symptoms of breast heaviness (65% vs 22%, p < 0.0001), redness (62% vs 29%, p = 0.0006), and swelling (59% vs 22%, p < 0.0001), but symptom-associated distress was low overall. Three of 32 breast lymphedema patients with clinical follow-up developed chronic edema. Breast lymphedema occurs in approximately one-half of women who undergo breast surgery with axillary node removal. The condition is characterized by diffuse skin edema and erythema as well as self-reported symptoms with a low level of distress.

Connexin 47 mutations increase risk for secondary lymphedema following breast cancer treatment

PURPOSE

Secondary lymphedema is a frequent complication of breast cancer associated with surgery, chemotherapy, or radiation following breast cancer treatment. The potential contribution of genetic susceptibility to risk of developing secondary lymphedema following surgical trauma, radiation, and other tissue insults has not been studied.

EXPERIMENTAL DESIGN

To determine whether women with breast cancer and secondary lymphedema had mutations in candidate lymphedema genes, we undertook a case-control study of 188 women diagnosed with breast cancer recruited from the University of Pittsburgh Breast Cancer Program (http://www.upmccancercenter.com/breast/index.cfm) between 2000 and 2010. Candidate lymphedema genes, GJC2 (encoding connexin 47 [Cx47]), FOXC2, HGF, MET, and FLT4 (encoding VEGFR3), were sequenced for mutation. Bioinformatics analysis and in vitro functional assays were used to confirm significance of novel mutations.

RESULTS

Cx47 mutations were identified in individuals having secondary lymphedema following breast cancer treatment but not in breast cancer controls or normal women without breast cancer. These novel mutations are dysfunctional as assessed through in vitro assays and bioinformatics analysis and provide evidence that altered gap junction function leads to lymphedema.

CONCLUSIONS

Our findings challenge the view that secondary lymphedema is solely due to mechanical trauma and support the hypothesis that genetic susceptibility is an important risk factor for secondary lymphedema. A priori recognition of genetic risk (i) raises the potential for early detection and intervention for a high-risk group and (ii) allows the possibility of altering surgical approach and/or chemo- and radiation therapy, or direct medical treatment of secondary lymphedema with novel connexin-modifying drugs.

Physical activity for cancer survivors: meta-analysis of randomised controlled trials

OBJECTIVE

To systematically evaluate the effects of physical activity in adult patients after completion of main treatment related to cancer.

DESIGN

Meta-analysis of randomised controlled trials with data extraction and quality assessment performed independently by two researchers.

DATA SOURCES

Pubmed, CINAHL, and Google Scholar from the earliest possible year to September 2011. References from meta-analyses and reviews.

STUDY SELECTION

Randomised controlled trials that assessed the effects of physical activity in adults who had completed their main cancer treatment, except hormonal treatment.

RESULTS

There were 34 randomised controlled trials, of which 22 (65%) focused on patients with breast cancer, and 48 outcomes in our meta-analysis. Twenty two studies assessed aerobic exercise, and four also included resistance or strength training. The median duration of physical activity was 13 weeks (range 3-60 weeks). Most control groups were considered sedentary or were assigned no exercise. Based on studies on patients with breast cancer, physical activity was associated with improvements in insulin-like growth factor-I, bench press, leg press, fatigue, depression, and quality of life. When we combined studies on different types of cancer, we found significant improvements in body mass index (BMI), body weight, peak oxygen consumption, peak power output, distance walked in six minutes, right handgrip strength, and quality of life. Sources of study heterogeneity included age, study quality, study size, and type and duration of physical activity. Publication bias did not alter our conclusions.

CONCLUSIONS

Physical activity has positive effects on physiology, body composition, physical functions, psychological outcomes, and quality of life in patients after treatment for breast cancer. When patients with cancer other than breast cancer were also included, physical activity was associated with reduced BMI and body weight, increased peak oxygen consumption and peak power output, and improved quality of life.

Symptom management in gynecologic malignancies

Patients with gynecologic cancer experience significant symptom burden throughout their disease course and treatment, which negatively impacts their quality of life. The most common symptoms in gynecologic cancer include pain, fatigue, depression and anxiety. Palliative care, including symptom management, focuses on the prevention and relief of suffering and improvement in quality of life, irrespective of prognosis. In a comprehensive cancer care model, palliative care, including symptom management, is offered concurrently with anticancer therapies throughout the disease course, not just at the end of life and not only once curative attempts have been abandoned. Good symptom management begins with routine symptom assessment and use of a standardized screening tool can help identify patients with high symptom burden. Literature regarding epidemiology, assessment and management of pain, fatigue, nausea/vomiting, lymphedema, ascites, depression, anxiety and sexual dysfunction in gynecologic oncology patients will be reviewed in this article.

Community-based exercise program effectiveness and safety for cancer survivors

PURPOSE

Clinical trials have demonstrated the benefits of exercise for cancer survivors. This investigation determined the effectiveness and safety of a disseminated community-based exercise program for cancer survivors who had completed treatment.

METHODS

Personal trainers from regional YMCAs received training in cancer rehabilitation and supervised twice-a-week, 12-week group exercise sessions for survivors. At baseline and post-program, validated measures assessed patient-reported outcomes (PRO) and physiologic measurements.

RESULTS

Data were collected from 221 survivors from 13 YMCA sites and 36 separate classes. All participants had data available at one time point, while matched baseline and post-program PRO and physiologic data were available for 85% (N = 187). Participants with matched data were largely female (82%), with mean age of 58 (range, 28-91 years). Time since diagnosis ranged from 1 to 48 (mean, 5.6 years), and mean time since last treatment was 3.0 (range, 1-33 years). Physiological improvements were significant in systolic (P < 0.001) and diastolic (P = 0.035) blood pressure, upper and lower body strength, the 6-min walk test (P = 0.004), and flexibility (P < 0.001). Participants reported improvements in overall health-related quality of life (P < 0.001), social support (P = 0.019), body pain (P = 0.016), fatigue (P < 0.001), insomnia (P < 0.001), and overall musculoskeletal symptoms (P = <0.001). Few injuries or lymphedema events occurred during classes.

CONCLUSIONS

Community-based exercise groups for cancer survivors of mixed diagnoses and ages, who have completed active treatment, have physiologic and psychosocial benefits, and are safe.

IMPLICATIONS FOR CANCER SURVIVORS

Survivors may expect significant benefit from participating in a community-based exercise program tailored to meet their individual needs as a survivor.

Systematic review: conservative treatments for secondary lymphedema

BACKGROUND

Several conservative (i.e., nonpharmacologic, nonsurgical) treatments exist for secondary lymphedema. The optimal treatment is unknown. We examined the effectiveness of conservative treatments for secondary lymphedema, as well as harms related to these treatments.

METHODS

We searched MEDLINE®, EMBASE®, Cochrane Central Register of Controlled Trials®, AMED, and CINAHL from 1990 to January 19, 2010. We obtained English- and non-English-language randomized controlled trials or observational studies (with comparison groups) that reported primary effectiveness data on conservative treatments for secondary lymphedema. For English-language studies, we extracted data in tabular form and summarized the tables descriptively. For non-English-language studies, we summarized the results descriptively and discussed similarities with the English-language studies.

RESULTS

Thirty-six English-language and eight non-English-language studies were included in the review. Most of these studies involved upper-limb lymphedema secondary to breast cancer. Despite lymphedema's chronicity, lengths of follow-up in most studies were under 6 months. Many trial reports contained inadequate descriptions of randomization, blinding, and methods to assess harms. Most observational studies did not control for confounding. Many studies showed that active treatments reduced the size of lymphatic limbs, although extensive between-study heterogeneity in areas such as treatment comparisons and protocols, and outcome measures, prevented us from assessing whether any one treatment was superior. This heterogeneity also precluded us from statistically pooling results. Harms were rare (< 1% incidence) and mostly minor (e.g., headache, arm pain).

CONCLUSIONS

The literature contains no evidence to suggest the most effective treatment for secondary lymphedema. Harms are few and unlikely to cause major clinical problems.

A joint latent variable model approach to item reduction and validation

Many applications of biomedical science involve unobservable constructs, from measurement of health states to severity of complex diseases. The primary aim of measurement is to identify relevant pieces of observable information that thoroughly describe the construct of interest. Validation of the construct is often performed separately. Noting the increasing popularity of latent variable methods in biomedical research, we propose a Multiple Indicator Multiple Cause (MIMIC) latent variable model that combines item reduction and validation. Our joint latent variable model accounts for the bias that occurs in the traditional 2-stage process. The methods are motivated by an example from the Physical Activity and Lymphedema clinical trial in which the objectives were to describe lymphedema severity through self-reported Likert scale symptoms and to determine the relationship between symptom severity and a "gold standard" diagnostic measure of lymphedema. The MIMIC model identified 1 symptom as a potential candidate for removal. We present this paper as an illustration of the advantages of joint latent variable models and as an example of the applicability of these models for biomedical research.

The effect of resistance training on muscle strength and physical function in older, postmenopausal breast cancer survivors: a randomized controlled trial

INTRODUCTION

Older breast cancer survivors (BCS) report more falls and functional limitations than women with no cancer history. Exercise training could reduce risk factors for future falls and disability.

METHODS

We conducted a randomized, controlled trial in 106 early-stage, postmenopausal BCS who were ≥50 years old at diagnosis and post-treatment. Women were randomly assigned to a 1-year resistance + impact exercise program or a stretching placebo program. Endpoints were one repetition maximum bench press and leg press strength, timed five chair stands, 4 m usual walk speed, timed stance tests, handgrip strength, self-report physical function, and fatigue. We also examined the influence of age, adjuvant hormone therapy use, and exercise adherence on study outcomes.

RESULTS

Women in the resistance + impact training program significantly improved maximal leg (p <0 .02) and bench (p <0 .02) press strength compared to the stretching group. Women who attended 50% or more of prescribed resistance training sessions had significantly better changes in maximal strength measures compared to less adherent women.

CONCLUSIONS

Resistance + impact exercise is superior to stretching at improving maximal muscle strength and exercise adherence contributes to the degree of improvement.

IMPLICATIONS FOR CANCER SURVIVORS

Older BCS can safely engage in resistance exercise that improves lower and upper body strength, thereby reducing a risk factor for falls and future disability. However, the ability of resistance training to shift other indices of fall and disability risk, i.e., balance and function, is unclear. Strategies to promote adherence to resistance training could lead to greater improvements in strength.

A randomized trial of exercise on well-being and function following breast cancer surgery: the RESTORE trial

OBJECTIVES

This study aimed to determine the effect of a moderate, tailored exercise program on health-related quality of life, physical function, and arm volume in women receiving treatment for nonmetastatic breast cancer.

METHODS

Women who were within 4-12 weeks of surgery for stage I-III breast cancer were randomized to center-based exercise and lymphedema education intervention or patient education. Functional assessment of cancer therapy-breast cancer (FACT-B), 6-min walk, and arm volume were performed at 3-month intervals through 18 months. Repeated measures analysis of covariance was used to model the total meters walked over time, FACT-B scores, and arm volume. Models were adjusted for baseline measurement, baseline affected arm volume, number of nodes removed, age, self-reported symptoms, baseline SF-12 mental and physical component scores, visit, and treatment group.

RESULTS

Of the recruited 104 women, 82 completed all 18 months. Mean age (range) was 53.6 (32-82) years; 88% were Caucasian; 45% were employed full time; 44% were overweight; and 28% obese. Approximately, 46% had breast-conserving surgery; 79% had axillary node dissection; 59% received chemotherapy; and 64% received radiation. The intervention resulted in an average increase of 34.3 ml (SD = 12.8) versus patient education (p = 0.01). Changes in FACT-B scores and arm volumes were not significantly different.

CONCLUSIONS

With this early exercise intervention after breast cancer diagnosis, a significant improvement was achieved in physical function, with no decline in health-related quality of life or detrimental effect on arm volume.

IMPLICATIONS FOR CANCER SURVIVORS

Starting a supervised exercise regimen that is tailored to an individual's strength and stamina within 3 months following breast cancer surgery appears safe and may hasten improvements in physical functioning.

Risk factors for lymphedema in breast cancer survivors, the Iowa Women's Health Study

Risk factors for lymphedema and related arm symptoms in breast cancer (BC) survivors have not been examined using a large prospective population-based cohort. The Iowa Women's Health Study (IWHS) collected self-reported data for diagnosed lymphedema in 2004, and data for cancer diagnosis, treatment, behavioral and health characteristics between 1986 and 2003. We studied 1,287 women, aged 55-69 at baseline, who developed unilateral BC: n = 104 (8%) with diagnosed lymphedema, n = 475 (37%) with arm symptoms but without diagnosed lymphedema, and n = 708 without lymphedema. Age- and multivariate-adjusted logistic regression models examined risk factors for lymphedema and related arm symptoms (OR [95% confidence interval]). The mean time between BC and the 2004 survey was 8.1 ± 5.0 (mean ± SD) years. After multivariate adjustment, the following cancer characteristics were positively associated with lymphedema: tumor stage (regional vs. in situ: 3.92 [1.61-9.54]), number of excised nodes (highest vs. lowest quintile: 3.52 [1.32-9.34], P (trend) = 0.003), tumor-positive nodes (yes vs. no 2.12 [1.19, 3.79]), and adjuvant chemotherapy (yes vs. no: 3.05 [1.75-5.30]). Several health characteristics were positively associated with lymphedema: baseline body mass index (highest vs. lowest tertile: 3.24 [1.70-6.21]), waist and hip circumference, and general health (fair/poor vs. excellent: 3.44 [1.30-9.06]). Positive associations with arm symptoms were number of excised nodes (highest vs. lowest quintile: 2.38 [1.41-4.03], P (trend) = 0.007), axillary radiation (yes vs. no: 1.72 [1.15-2.57]), and baseline general health (fair/poor vs. excellent: 4.27 [2.60-7.00]). In the IWHS, obesity, poorer general health, and markers of more advanced cancer were risk factors for lymphedema and related arm symptoms in BC survivors.

Physical Activity and Breast Cancer Survivorship

The completion of primary treatment for breast cancer has been referred to as a “teachable moment” for health behavior change, suggesting that women are receptive to receiving physical activity counseling. However, the majority of breast cancer survivors are not sufficiently active. Health care providers may play a pivotal role in increasing patients’ physical activity behavior, yet physician counseling for physical activity is not done regularly. One reason for this failure may relate to the limited guidelines put forward to assist health care providers in how best to optimize the benefits of physical activity among breast cancer survivors. To help provide guidelines for physical activity counseling with breast cancer survivors, the authors synthesized evidence-based recommendations based on a review of 30 intervention studies. The evidence on (1) type, (2) intensity, and (3) frequency and duration of physical activity for this population was examined. On the basis of the reviewed studies, the authors find that physical activity programs for breast cancer survivors should include aerobic training at least 3 times/wk for 30 minutes, resistance training 2 to 3 times/wk (6-12 exercises), and flexibility training 3 times/wk for 50 to 60 minutes to obtain health benefits. The provision of these recommendations may facilitate effective and consistent delivery of physical activity counseling to breast cancer survivors.

Lymphedema: a therapeutic approach in the treatment and rehabilitation of cancer patients

Lymphedema therapy has gone by many names in the recent past, being referred to as complex decongestive therapy, complex physical therapy, or decongestive lymphatic therapy, among others. There are two phases of lymphedema treatment: the acute "intensive" phase and the maintenance phase. In the acute phase of treatment, the individual is typically wrapped with medical short-stretch compression bandages; receives a therapeutic exercise routine, skin care, and education; and undergoes manual lymphatic drainage by a specially trained physical therapist or healthcare professional. In the maintenance phase, the goals are for the individual to be able to wear a well-fitted appropriate gradient pressure garment during the day and compression bandaging (or a device that serves as an alternative to bandaging) at night, to maintain good skin care, to continue with therapeutic exercise, and to self-perform manual lymphatic drainage (or use a mechanical device that can perform manual lymphatic drainage) for the area of the body with impaired lymphatics. The effectiveness of the various components in each phase, as well as the motivation and compliance of the patient, differs. Further randomized trials are required to determine which component or combination of components in complex decongestive therapy works most effectively. It is recommended for patients not only to maintain physical activity for its many health benefits but also to facilitate muscle pumping to move lymphatic fluid throughout the body. Knowledge of some of the pathophysiologic mechanisms involved in the development of lymphedema is increasing, and it is possible that current modes of treatment of lymphedema will be augmented by molecular therapies in the future.

Exercise in patients with lymphedema: a systematic review of the contemporary literature

BACKGROUND

Controversy exists regarding the role of exercise in cancer patients with or at risk for lymphedema, particularly breast. We conducted a systematic review of the contemporary literature to distill the weight of the evidence and provide recommendations for exercise and lymphedema care in breast cancer survivors.

METHODS

Publications were retrieved from 11 major medical indices for articles published from 2004 to 2010 using search terms for exercise and lymphedema; 1,303 potential articles were selected, of which 659 articles were reviewed by clinical lymphedema experts for inclusion, yielding 35 articles. After applying exclusion criteria, 19 articles were selected for final review. Information on study design/objectives, participants, outcomes, intervention, results, and study strengths and weaknesses was extracted. Study evidence was also rated according to the Oncology Nursing Society Putting Evidence Into Practice® Weight-of-Evidence Classification.

RESULTS

Seven studies were identified addressing resistance exercise, seven studies on aerobic and resistance exercise, and five studies on other exercise modalities. Studies concluded that slowly progressive exercise of varying modalities is not associated with the development or exacerbation of breast cancer-related lymphedema and can be safely pursued with proper supervision. Combined aerobic and resistance exercise appear safe, but confirmation requires larger and more rigorous studies.

CONCLUSIONS

Strong evidence is now available on the safety of resistance exercise without an increase in risk of lymphedema for breast cancer patients. Comparable studies are needed for other cancer patients at risk for lymphedema.

IMPLICATIONS FOR CANCER SURVIVORS

With reasonable precautions, it is safe for breast cancer survivors to exercise throughout the trajectory of their cancer experience, including during treatment.

Design and conduct of intervention-based research among cancer survivors

Intervention trials in cancer survivors play an important and growing role in complementing the wealth of knowledge obtained from observational studies about how lifestyle can improve clinical, physiologic, and psychological outcomes. As the number of intervention trials grows, attention to study design and reporting is essential to establishing a high-quality data pool from which to make evidence-based recommendations and guidelines. We highlight several key issues important to the design and interpretation of intervention trials in cancer survivors. Intervention dose and duration both matter in trials of cancer survivors, yet few trials have evaluated different intervention doses and few intervention trials with multiyear follow-up exist. Finally, there is a need for interventions both of longer duration and those that take a practical trials approach and reflect clinical practice to speed implementation within practice and improve outcomes for cancer survivors.

Survivors at higher risk for adverse late outcomes due to psychosocial and behavioral risk factors

Cancer survivors face significant morbidity and mortality associated with their disease and treatment regimens, some of which can be improved through modifying behavioral and psychosocial risk factors. This article examines risk factors for adverse late effects that contribute to morbidity and mortality in cancer survivors, provides a literature review on interventions to modify these risks factors, and summarizes the national recommendations and associated current practices for identifying and managing these risk factors. Finally, future directions for research and clinical practice are discussed.

Exercise for secondary prevention of breast cancer: moving from evidence to changing clinical practice

Relating to the report of Irwin and colleagues in this issue of the journal (beginning on page 522), this perspective discusses exercise training interventions as secondary prevention in breast cancer survivors. Burgeoning observational evidence indicates that prescribing aerobic exercise of 3 hours or more per week could have meaningful mortality and morbidity benefits for breast cancer survivors. Adherence to this exercise prescription, however, will require an infrastructure to guide survivors and to address the common clinical treatment sequelae that might interfere with survivors' ability to regularly perform this level of activity (e.g., symptoms related to estrogen deprivation, arthralgias due to aromatase inhibitors, fatigue, lymphedema, chemotherapy-induced peripheral neuropathy, osteoporosis, upper-extremity functional impairments, and overall functional decline). On the basis of cardiac rehabilitation, a model is proposed to integrate exercise prescription into breast cancer survivor clinical care, with referral to community-based programs for most women.

Effects of early exercise on the development of lymphedema in patients with breast cancer treated with axillary lymph node dissection

PURPOSE

Despite advances in the treatment of breast cancer, there is little research examining the prevention of lymphedema after breast and/or axillary surgery. Currently, there are no national guidelines for activity restrictions; however, many medical providers recommend restricting activity of the surgically affected arm, which can create quality-of-life issues as well as future medical issues for patients with breast cancer.

METHODS

A literature review of several current research articles was performed. This report reviews four studies evaluating the effects of restricted activity versus progressive exercise and stretching activities on development of lymphedema.

RESULTS

The results show that there is no difference in the risk of developing lymphedema when following activity guidelines. All four of the studies reviewed report results of either a decrease in the development of lymphedema or no increased risk of development of lymphedema when early exercise regimens are incorporated into postoperative care.

CONCLUSION

The four research articles show promising results that support future change in practice guidelines. However, none of the studies report follow-up results beyond 2 years. Additionl evaluation to monitor long-term effects is warranted.

Effects of physical activity on common side effects of breast cancer treatment

Motivating women with breast cancer to engage in regular physical activity may be an enormous challenge given the common side effects of breast cancer treatment. The objective of this narrative review is to briefly summarize recent research evidence examining the influence of physical activity on commonly occurring side effects of breast cancer treatment. Overall, current research evidence indicates that regular participation in physical activity after breast cancer diagnosis may mitigate common side effects of breast cancer adjuvant therapy, including fatigue, depression, impaired quality of life, decreased muscular strength, decreased aerobic capacity, and weight gain. Future research could examine the influence that physical activity has on the effectiveness of breast cancer treatment. Implications for health care professionals are discussed.

Priorities for women with lymphoedema after treatment for breast cancer: population based cohort study

OBJECTIVE

To explore the perceived unmet needs among women treated for breast cancer and in whom symptoms and signs indicate the presence of lymphoedema.

DESIGN

Population based cross sectional survey with a purpose designed questionnaire (60 items).

SETTING

Cancer registries of New South Wales, Victoria, and South Australia.

PARTICIPANTS

237 women with symptoms and signs indicative of lymphoedema from an initial 1930 eligible women.

MAIN OUTCOME MEASURE

Unmet needs in the previous month across psychological, health system and information, physical and daily living, patient care and support, sexuality needs, body image, and financial domains.

RESULTS

The 10 items most commonly identified as a "moderate to high current need" included having their doctor and allied health workers being fully informed about lymphoedema, acknowledge the seriousness of the condition, and be willing to treat it. Women also wanted access to up to date treatments, both mainstream and alternative, and financial assistance for their garments. The three factors that explained most of the variance were: information and support (11 items), which accounted for 49% of the variance; body image and self esteem (seven items; 7% variance); and health system (seven items; 5% variance). Examination of these three factors showed that while the levels of need were generally low, they were common.

CONCLUSION

To address the needs of women with lymphoedema and perhaps to prevent progression of lymphoedema, it is important that practitioners do not dismiss mild symptoms and that women are referred to an appropriate specialist.