Results

American College of Cardiology Foundation

12/04/2019 | Press release | Distributed by Public on 12/04/2019 13:41

Exercise Before, During, and After Cancer Therapy

Introduction

Early detection of cancer and its effective management have considerably improved the 5-year disease-survival rates of common malignancies. However, cancer and its treatment have physical, psycho-physical, and psychological adverse effects. These can be acute or short-duration symptoms that develop before or during cancer therapy, chronic symptoms that persist for months or years during cancer treatment, and late symptoms that develop months or years after treatment. These symptoms (Table 1) adversely affect the quality of lives of patients with cancer.1-3

Table 1: Symptoms of Cancer and Cancer Therapy1-3

Symptom Type With Examples Acute Chronic Late
Physical: Bone loss and metastases, changes in body composition (metabolic syndrome, weight gain), loss of appetite, cachexia, cardiovascular disease (CVD), lymphedema, peripheral neuropathy, nausea/vomiting, diarrhea, dyspnea, constipation, hair loss, sore mouth, and sweating Nausea, vomiting, skin rashes, peripheral neuropathy, hair loss, decline in physical function Lymphedema, peripheral neuropathy, infertility, changes in body composition, pre-mature menopause, cardio-vascular complications Osteoporosis, osteopenia, cardiovascular complications (arrhythmias, arterial hypertension, coronary artery disease (CAD), diastolic dysfunction, heart failure, interstitial myocardial fibrosis, myocardial dysfunction, peripheral vascular disease, pulmonary hypertension, thromboembolism, stroke, and valvular disease)
Psycho-physical: Pain, fatigue, decreased muscle strength, inactivity, drowsiness, and insomnia (sleep disturbance) Pain, fatigue Fatigue Fatigue
Psychological: Depression, anxiety, quality of life (QOL), and self-esteem Anxiety, depression, changes in self-esteem and body image, decline in emotional function Depression

Several reviews, meta-analyses, and studies have shown that non-pharmacological interventions such as healthy diet, yoga, and exercise are positively associated with improved survival and QOL and reduction in some cancer-associated symptoms (fatigue, pain, constipation, dyspnea, and weight and sleep problems) and cardiovascular outcomes in patients with cancer.1,3-14 Therefore, oncologists should incorporate these non-pharmacological interventions into the treatment paradigm of their patients with cancer. Exercise can be prescribed right at the time of diagnosis of cancer and through the treatment and post-treatment as well. Oncologists should therefore be aware of the different exercise types, their benefits, and their timing in the patient's journey. They should, however, know that there is no evidence showing that exercise has beneficial effect on symptoms like nausea/vomiting, diarrhea, or loss of appetite.2

Also, cancer and CVD have several common risk factors such as smoking, diabetes, obesity, hypertension, and metabolic syndrome.15 Additionally, anti-cancer anthracycline-based chemotherapies, monoclonal antibodies such as trastuzumab, and radiation therapies that oncologists regularly prescribe are known to have cardiac toxicities.16 Cardiologists form an integral part of the cardio-oncology team to preempt, diagnose, and treat cardiovascular side effects of oncologic treatments.17 Cardiologists are well-versed with cardiac rehabilitation non-pharmacological intervention models such as prescribed exercise, education, counseling, and lifestyle modifications. They can work with oncologists to incorporate these models in the cancer setting as well.8 Oncologists should collaborate with cardiologists, physiotherapists, dieticians, psychologists, and others to form a multidisciplinary team that looks at the exercise and diet aspects of patients with cancer. The physiotherapist in the cardio-oncology team should also be able to recognize when the prescribed exercise starts exhausting their patient and to change its type and intensity without majorly affecting its benefits, where possible. This review is an attempt to educate the cardio-oncology team about the types of exercises that can be prescribed to patients with cancer, when the exercises can be prescribed, exercise intensity, and the benefits provided by these exercises in alleviating the side effects of cancer and its treatment and in improving the cardiovascular fitness of the patients with cancer and survivors of cancer.

Benefits of Exercise in Patients With Cancer

Exercise helps in alleviating cancer-related adverse effects, has a beneficial effect on the whole body and cardiovascular health, and seems to slows cancer progression through probably direct action on tumor-intrinsic factors and by possibly improving the efficacy of the anti-cancer treatment.18 Additionally, a review of 100 studies showed that patients who exercise post cancer diagnosis had fewer cancer-related adverse effects and a lower risk of cancer recurrence and mortality compared with patients who either did not exercise or exercised minimally.19 Segal et al. reviewed 2 guidelines, 18 systematic reviews, and 29 randomized controlled trials studying the effect of exercise during active cancer treatment and after it to conclude that exercise is safe in patients with cancer and provides muscular and aerobic fitness and improves QOL.20

Clinicians should be aware that exercise has added benefit in reducing cardiovascular risk in patients with cancer who exercise regularly versus those who do not exercise if other cardiovascular health metrics (like body mass index, blood pressure, total cholesterol, and fasting blood glucose) are under control (Table 2).8,21

Table 2: Clinical and Cardiovascular Benefits of Exercise in Patients With Cancer in Neo-Adjuvant and Adjuvant Setting8

Setting and Cancer Type Beneficial Outcomes of Exercise
Adjuvant Setting
Breast Decreased CVD events and CAD mortality; cardio-respiratory fitness may remain the same, improve, or decrease depending on patient's condition and breast cancer stage; decreased left ventricular ejection fraction
Prostate and Colorectal Cancer Improves cardio-respiratory fitness
Post-Adjuvant Setting
Breast Decreased CVD events and all-cause mortality; cardio-respiratory fitness may improve or remain the same; vascular function improves
Prostate Vascular function and cardio-respiratory fitness improves
Adult Survivors of Childhood Cancers Decreased CVD events and all-cause mortality
Testicular Vascular function and cardio-respiratory fitness improves; improved Framingham risk score
Colorectal Cancer Decrease in all-cause mortality; cardio-respiratory fitness may remain the same, improve, or decrease
Leukemia and Lymphoma Improved cardio-respiratory fitness

Exercise Prescription in Patients With Cancer By Type of Exercise

Clinicians should understand that exercise and physical activity are two distinct entities. Physical activity is any movement by the musculoskeletal system resulting in energy expenditure. Exercise is a planned, structured, and repetitive physical activity that has a purpose and calculated and planned energy expenditure. Exercise can be prescribed during the pre-habilitation phase (time period between cancer diagnosis and initiation of its treatment), habilitation (during treatment), and rehabilitation phase (after therapy in survivors).

How to Decide Which Exercise Will Benefit the Patient

There are various types of exercises (aerobic, resistance, strength, weight and impact, balance, and flexibility and relaxation) that can be prescribed in various combinations depending on the symptoms.

The cardio-oncology team can decide which exercise type will benefit the concerned patient with cancer depending on the patient's physical, psycho-physical, and psychological symptoms (Table 3).1,3 Restorative exercise along with yoga helps significantly improve fatigue, pain, dyspnea, insomnia, constipation, risk for lymphedema, feeling of overall wellbeing, and cognitive and social functioning (p < 0.05).3,14

Table 3: Types of Exercises and Their Effect on Cancer Symptoms and Adverse Effects of Cancer Therapy1

Aerobic Exercise Resistance Exercise Strength Exercise Weight and Impact Exercise Balance Exercise Flexibility and Relaxation Exercise
Physical Aspects
Bone Loss and Disease X X
Muscle and Fat Mass Imbalance X X
Cachexia X X
Peripheral Neuropathy X X
Lymphedema X
Psycho-Physical Aspects
Pain X
Fatigue X X X X
Sleep Disorders X X
Psychological Aspects
Depression, Anxiety X
QOL X X X X
Self-Esteem X

How to Write an Exercise Prescription and Assess Intensity of Exercise

Each exercise prescription should follow the FITT principle and clearly state frequency (the number of times the exercise will be performed per week), intensity, time or duration, and type of exercise.22,23 Intensity of exercise can be measured subjectively by the patient and objectively by the physician or trainer (Figure 1).22,24-26 At each stage, patients should be monitored carefully and the exercise regimen modified based on the patient's physical condition, endurance, and fatigue level along with cardiovascular fitness and presence of cardiovascular risk factors.8,21,23

Figure 1: Measuring Exercise Intensity22,24-26

Exercise Prescription in Patients With Cancer By Exercise Intensity

Usually, patients with cancer can safely perform moderate intensity exercise during and after treatment, and this helps improve their aerobic and muscular fitness and QOL.22 Simple exercises like walking 3-4 days a week can improve functional ability of patients with cancer.3 Compared with high-intensity exercises, moderate-intensity exercise can be sustained over a longer period of time and provide the required protective benefits, including cardiovascular protection.3,8,21,22

Several American and Canadian societies recommend 150 minutes of moderate intensity exercise over 3-5 days and at least 2 days devoted to resistance exercise every week. Each exercise session should include a warm-up and a cool-down. The resistance exercise session should involve 2 sets of 8-10 major muscle groups repeated 8-10 times.3,22 Flexibility exercises should also include all major muscle groups, and balance exercise should be included for all elderly patients and for those who have balance issues.3

Exercising in a Supervised Setting

Patients with cancer who are severely debilitated and have other comorbidities or cardiovascular risk factors or have experienced or are at risk of experiencing cardiovascular side effects due to cancer therapy should initially be exercised in a supervised setting by a trained physical therapist. Community-based programs will benefit cancer survivors with least debility.21,27 Exercise programs in a supervised or group setting have multiple benefits and are found to be superior in improving QOL, fatigue, and muscular strength than an individual exercising alone. These programs provide the right motivation, exercise technique, and a safe environment to exercise.20,28

Pre-Exercise Assessment for Patients With Cancer

The next important thing for the cardio-oncology team is to assess the patient's condition to chalk out an exercise regimen that would be beneficial for the patient. The pre-exercise assessment should include the patient's general condition and special considerations (e.g., lymphedema, peripheral neuropathy, cardiovascular risk, musculoskeletal morbidities, cardiac issues, and special situations such as central lines, ostomies, or breast reconstruction) (Table 4).3,8,22

Table 4: Pre-Exercise Assessment of Patients With Cancer8

Normal Testing
Cardiopulmonary Exercise Testing (CPET)
Resting blood pressure (BP) ≤160/90 mmHg (If elevated, recheck after 5 minutes. If still elevated, then reschedule CPET after patient is seen by provider to adjust BP medications.)
Normal BP response to exercise
No inducible ischemia
No atrial or ventricular arrhythmias
Maintain normal O2 saturations
No symptoms (Symptoms such as dyspnea, chest pain, or dizziness or other cardiac symptoms during exercise deemed abnormal by supervising physician.)
6-Minute Walk Test
Resting BP ≤160/90 mmHg (If elevated, recheck after 5 minutes. If still elevated, then reschedule CPET after patient is seen by provider to adjust BP medications.)
Maintain normal O2 saturations
Laboratory Studies
Absence of severe anemia (<8.0 g/dL)
Absolute neutrophil count >500 mm3
Platelet count >50 000/mcL
No Baseline Symptoms
Acute nausea during exercise
Vomiting within 24 hours
Disorientation
Blurred vision
Ongoing Cancer Complications
Acute infection
Acute metabolic disease (Examples include abnormal thyroid function, uncontrolled diabetes mellitus, and electrolyte abnormalities.)
New-onset lymphedema
Mental or physical impairment to exercise
Initial wound healing after surgery
Bone or brain metastasis (For patients with bone or brain metastases, a plan needs to include a consultation with oncology rehabilitation to establish a patient-specific safe exercise plan.)
Displays Exercise Knowledge
Understands functions of aerobic and resistance equipment
Demonstrates correct form on equipment
Understands perceived exertion and heart rate goals; performs exercise accordingly

Barriers to Exercise During Cancer Therapy and Predictors of Adherence

Clinicians should be aware of the challenges and barriers that prevent patients with cancer from adhering to their exercise programs. Exercising can be a challenge in patients with cancer because physical activity decreases during course of disease, resulting in de-conditioning or reduced exercise capacity. Additionally, cancer cells release substances such as circulating cytokines, proteolysis-inducing factor, and lipid-mobilizing factor that impair energy metabolism. Cancer and its treatment can cause anorexia, nausea, vomiting, dehydration, systemic inflammation, oxidative stress, mitochondrial death, and skeletal muscle atrophy, all of which reduce the exercise capacity. Cardiovascular complications of cancer treatment also make exercising difficult.21,29

Apart from this, several oncology care settings lack proper exercise screening, implementation, and referral programs. Oncologists and patients both lack proper guidance and knowledge about exercising, and the multidisciplinary team often does not have a trained physical therapist to guide the exercise sessions.30 Similarly, the multitude of surgical procedures, treatment options and their side effects, types of cancer, and variance in metastatic spread makes it impossible to develop a single exercise protocol/regimen that can be universally followed.23

Positive exercise history, high motivation level, fewer exercise limitations, and availability of an exercise center close to home are independent predictors of adherence to exercise during cancer treatment. In cancer survivors, adherence to exercise during cancer treatment, high motivation levels, decreased alcohol consumption, availability of physical trainers and training centers, less extensive surgery, family support, and the right patient education predict higher adherence to exercise.31

Strategies to Make Exercise a More Accessible Therapy

A single-center program offering exercise counseling consultation along with cardio-oncology care is beneficial in improving self-reported QOL and physical and psychosocial symptoms in patients with cancer.28 The benefits multiply with each exercise counseling session, stressing the need to integrate exercise counseling into the treatment paradigm of patients with cancer.28

Strategies to improve exercise adherence would need to be constantly researched and various care models developed and tested to see what model works best. Easy access to diverse community-, center-, or home-based exercise programs is required. These programs should be either low cost or fully reimbursed by insurance (Figure 2). To make this possible, there is a need to spread awareness about these programs and their benefits and necessity among patients, oncologists, and policy makers.32

Figure 2: Action Steps to Increase the Availability and Uptake of Multimodal Interventions Including Exercise for Patients With Cancer and Survivors32

Conclusion

This review highlights the importance of exercise as a safe and effective strategy to improve physical, muscular, and cardiovascular fitness in adult patients with cancer and improve their QOL. Multimodal regimens incorporating exercise with nutrition and psychological support need to be tested to find a model that can be universally applied with scope for suitable alterations. Exercise does seem to have some cognitive benefit, and this should continue to be studied in detail. There is still not much clarity on the timing, type, intensity, and frequency of exercise that gives maximum cognitive benefit.33,34 Further research in this area will empower the cardio-oncology team to better adjust exercise in their oncology prescriptions, improve their cardio-respiratory fitness, and reduce associated cardiovascular risk.

References

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Clinical Topics:Arrhythmias and Clinical EP, Cardio-Oncology, Diabetes and Cardiometabolic Disease, Dyslipidemia, Heart Failure and Cardiomyopathies, Prevention, Pulmonary Hypertension and Venous Thromboembolism, Sports and Exercise Cardiology, Vascular Medicine, Atherosclerotic Disease (CAD/PAD), Implantable Devices, SCD/Ventricular Arrhythmias, Atrial Fibrillation/Supraventricular Arrhythmias, Lipid Metabolism, Nonstatins, Novel Agents, Acute Heart Failure, Pulmonary Hypertension, Diet, Exercise, Hypertension, Smoking, Stress, Sleep Apnea, Sports and Exercise and ECG and Stress Testing

Keywords:Cardiotoxicity, Cardiotoxins, Alopecia, Anorexia, Anthracyclines, Arrhythmias, Cardiac, Atrophy, Anxiety, Appetite, Blood Glucose, Blood Pressure, Body Composition, Body Image, Body Mass Index, Bone Diseases, Metabolic, Breast Neoplasms, Brain Neoplasms, Calcium Carbonate, Cachexia, Cardiac Rehabilitation, Cardiovascular Diseases, Cholesterol, Cognition, Chest Pain, Colorectal Neoplasms, Comorbidity, Constipation, Coronary Artery Disease, Counseling, Cytokines, Diabetes Mellitus, Depression, Dehydration, Dizziness, Diarrhea, Early Detection of Cancer, Dyspnea, Electrolytes, Energy Metabolism, Exercise Test, Exercise, Exercise Therapy, Fasting, Hypertension, Hypertension, Pulmonary, Heart Failure, Infertility, Inflammation, Intrinsic Factor, Leukemia, Lymphedema, Lymphoma, Mammaplasty, Menopause, Metabolic Syndrome X, Midazolam, Muscle Strength, Muscle, Skeletal, Motivation, Musculoskeletal System, Nausea, Neoadjuvant Therapy, Nutritionists, Obesity, Osteoporosis, Ostomy, Oxidative Stress, Pain, Patient Care Team, Patient Safety, Peripheral Nervous System Diseases, Peptides, Peripheral Vascular Diseases, Physical Endurance, Physical Therapists, Prostate, Proteolysis, Referral and Consultation, Risk Factors, Quality of Life, Self Report, Sleep Initiation and Maintenance Disorders, Sleep Stages, Smoking, Stroke, Stroke Volume, Survival Rate, Sweating, Thromboembolism, Thyroid Gland, Vomiting, Weight Gain


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