Logan Steele
Cancer patients often experience muscle loss due to the disease itself or as a side effect of treatment. However, research suggests that building and preserving muscle mass through strength training may improve cancer prognosis and help patients withstand the side effects of cancer treatment. Additionally, physical exercise has been associated with a reduced risk of certain types of cancer and lower total cancer mortality. The exact mechanisms by which exercise and muscle mass influence cancer progression are still being elucidated, but studies suggest that exercise and muscle-derived factors can create an unfavorable environment for cancer development and progression.
| Characteristics | Values |
|---|---|
| Muscle-strengthening activities | Associated with a 10-20% lower risk of all-cause mortality |
| Muscle-strengthening activities | Associated with a 26% lower incidence of kidney cancer |
| Muscle-strengthening activities | Associated with lower total cancer mortality |
| Muscle wasting | Has a negative effect on treatment toxicity and cancer prognosis |
| Resistance training | Can increase muscle mass or counteract muscle wasting |
| Musclin | Enhances aerobic capacity |
| Musclin | Implicated in cancer-related muscle cachexia |
| Cachexia | A muscle-wasting disease with no approved treatment drug in the United States |
| Cachexia | Affects up to 80% of cancer patients |
| Cachexia | Responsible for up to 30% of all cancer-related deaths |
| Sarcopenia | Progressive loss of muscle mass, strength, and physical functioning |
| Sarcopenia | Common among cancer patients and survivors |
| Cytokines | May cause skeletal muscles to wither |
| Exercise | May counter muscle loss and lessen the intensity of treatment side effects |
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What You'll Learn
Muscle-strengthening exercises reduce the risk of cancer
Muscle-strengthening exercises are essential for overall health and well-being, and they may also play a role in cancer prevention and treatment. While the exact mechanisms are still being explored, research suggests that muscle-strengthening exercises can reduce the risk of developing cancer and improve outcomes for those undergoing cancer treatment.
Several studies have investigated the link between muscle-strengthening activities and cancer incidence and mortality. A systematic review and meta-analysis of observational studies published in the International Journal of Behavioral Nutrition and Physical Activity in 2021 analyzed data from over 1.2 million participants. The results indicated that muscle-strengthening activities were associated with a 26% lower incidence of kidney cancer compared to low levels of muscle-strengthening activities. Additionally, higher levels of muscle-strengthening activities were linked to a lower overall cancer mortality rate, with a hazard ratio of 0.87.
Another study, published in the British Journal of Sports Medicine, found that adults who engaged in 30 to 60 minutes of muscle-strengthening exercises each week had a 10 to 20% reduction in mortality risk from all causes, including cancer. This study also reported a reduced risk of developing other health conditions such as cardiovascular disease and diabetes. However, it is important to note that this particular study did not find a risk reduction for specific types of cancer, such as colon, kidney, bladder, and pancreatic cancer.
The potential benefits of muscle-strengthening exercises in cancer prevention and treatment may be attributed to several factors. Physical activity, including muscle-strengthening exercises, has been shown to have systemic anti-inflammatory effects, which can counteract the inflammation caused by cancer and its treatments. Additionally, skeletal muscle secretes bioactive molecules, such as myokines and muscle-enriched miRNAs (myomiRs), which have potential anticancer properties. These molecules can fight against tumorigenesis and create an unfavorable environment for cancer progression.
Furthermore, building and maintaining muscle mass during cancer treatment can be advantageous. Research suggests that having good muscle mass may improve cancer prognosis and help individuals better withstand the side effects of cancer treatments, such as muscle wasting (cachexia) and metabolic alterations. Thus, muscle-strengthening exercises may be a valuable adjunct to traditional cancer therapies, enhancing overall health and potentially improving outcomes.
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Physical exercise provides benefits against cancer
Physical exercise provides significant benefits in the fight against cancer. Research has shown that muscle-strengthening exercises can lower the risk of developing cancer, improve prognosis, and help patients withstand the side effects of cancer treatments.
Muscle cells produce nutrients as they break down proteins, a process called autophagy. Cancer may take advantage of this process to promote cancer cell growth. Additionally, cancer and its treatments can cause inflammation, leading to cachexia, a muscle-wasting condition. Exercise, particularly resistance and strength training, can help counteract muscle loss and improve physical function in cancer patients. It can also enhance blood flow, regulate blood sugar, and release endorphins, reducing the intensity of treatment side effects.
Furthermore, skeletal muscle secretes bioactive molecules (myokines and muscle-enriched miRNAs, or myomiRs) through contraction, which fight against tumorigenesis and disease progression. Exercise promotes beneficial expression patterns of circulating miRNAs, increasing the production of tumor suppressors and inactivating tumor promoters, creating an unfavorable environment for cancer progression.
While the exact mechanisms are still being elucidated, physical activity has been associated with a reduced risk of certain types of cancer, such as kidney cancer, and a lower overall cancer mortality rate. Combined muscle-strengthening and aerobic activities may provide the greatest reduction in total cancer mortality, with 30-60 minutes of muscle-strengthening exercises per week being recommended to lower the risk of all-cause mortality.
In conclusion, physical exercise plays a crucial role in preventing and combating cancer. It helps to improve muscle mass, reduce inflammation, and create an environment hostile to cancer progression. By incorporating muscle-strengthening exercises into their routines, individuals can lower their risk of developing cancer and improve their prognosis if diagnosed.
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Muscle loss during cancer treatment
There are several factors that contribute to muscle loss during cancer treatment. Firstly, cancer treatments themselves, such as chemotherapy, can cause muscle atrophy or wasting. Additionally, the disease itself can lead to muscle loss due to increased muscle protein degradation, impaired muscle protein synthesis, and defective myogenesis. Inflammation caused by cancer and its treatments can also promote cachexia by altering a patient's metabolism, resulting in muscle and fat cells breaking down faster than they can be replenished. This is influenced by chemical messengers called cytokines, which stimulate immune system cells but can also cause skeletal muscles to wither.
The mechanisms underlying cancer-related muscle wasting are not yet fully understood, and discrepancies have been reported between different experimental models and tumor types. However, research suggests that overexpression of Pax7, which regulates muscle stem cell proliferation, impairs the differentiation of these cells into muscle cells in cases of cachexia. When mice with tumors received a treatment that interfered with Pax7 production, they showed an increase in muscle mass.
Despite the challenges, there are strategies that can help mitigate muscle loss during cancer treatment. Exercise, for instance, can play a crucial role in countering muscle loss and improving prognosis. Physical activity has been shown to have systemic anti-inflammatory effects, reducing treatment-related toxicity and enhancing blood flow and blood sugar regulation. Additionally, nutritional interventions are essential to ensuring adequate energy and nutrient supply, which are critical for increasing or stabilizing muscle mass and body weight.
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Cancer treatments cause inflammation, promoting cachexia
Cancer and its treatments can cause inflammation, which may lead to cachexia, a wasting syndrome resulting in dramatic weight and muscle loss. Cachexia is a multifactorial syndrome characterised by a loss of skeletal muscle mass, with or without fat mass loss, resulting in functional impairment and reduced quality of life. It affects up to 80% of cancer patients to some degree and is responsible for up to 30% of cancer-related deaths.
Cancer cachexia is caused by the upregulation of systemic inflammation and catabolic stimuli, leading to the inhibition of protein synthesis and the enhancement of muscle catabolism. Inflammatory pathways play a central role in the mechanisms underlying cachexia. The inflammation causes multiple biological behaviours to go awry, including disruptions in how muscle and fat cells make and use energy, known as metabolism. This disruption creates an environment where muscle and fat cells break down far faster than they can be replenished.
In the state of cancer cachexia, macrophages, mononuclear cells, and lymphocytes release large amounts of inflammatory cytokines, such as tumour necrosis factor-alpha (TNF-α), interleukin-1β, and interleukin-6. These cytokines, which are peptides present in the hypothalamus, promote feeding behaviour and suppress the action of neuropeptide Y as well as the secretion of corticotropin-releasing hormone, an antifeedant hormone. The activation of inflammatory cytokines results from the interactions between cancer cells and host cells.
The mechanisms underlying the development of cachexia are not yet fully understood, but recent progress in biochemical and biological analyses has helped to elucidate them. For example, the involvement of proteolysis-inducing factor (PIF), which is released from tumours and reflects abnormalities of the neuroendocrine system, has been revealed. Additionally, bone has been identified as a repository of certain factors that can induce inflammation and muscle loss, such as the protein RANKL, which may contribute to muscle loss in ovarian cancer, and lipocalin 2, which may fuel cachexia in pancreatic cancer.
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Muscle-strengthening activities and cancer mortality
Muscle-strengthening activities have been associated with a lower risk of kidney cancer and total cancer mortality. A 2021 systematic review and meta-analysis of observational studies found that muscle-strengthening activities were associated with a 26% lower incidence of kidney cancer. The review included 12 studies with a total of 1,297,620 participants and found that muscle-strengthening activities were also associated with lower total cancer mortality, with a hazard ratio of 0.87.
Another study found that combined muscle-strengthening and aerobic activities were associated with a 28% lower total cancer mortality. This suggests that incorporating both types of exercises may provide a greater reduction in cancer mortality. Additionally, muscle-strengthening activities have been linked to reduced all-cause mortality in individuals with chronic obstructive pulmonary disease (COPD).
While the exact mechanisms are not fully understood, physical exercise is known to provide significant benefits in cancer prevention and treatment. Exercise promotes the secretion of bioactive molecules, such as myokines and muscle-enriched miRNAs (myomiRs), which have anticancer properties. These molecules can fight against tumorigenesis and create an unfavorable environment for cancer progression. Furthermore, exercise can enhance blood flow, regulate blood sugar, release endorphins, and reduce inflammation in the body, which are all beneficial during cancer treatment.
Strength training is particularly important for cancer patients as it helps in building and maintaining muscle mass. Cancer and its treatments can lead to muscle loss and cachexia, a muscle-wasting condition affecting up to 80% of cancer patients. By engaging in muscle-strengthening activities, individuals can improve their prognosis and better withstand the side effects of cancer treatments.
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Frequently asked questions
Research shows that muscle-strengthening activities are associated with a reduced risk of cancer. Physical exercise has been shown to provide significant benefits against cancer in terms of prevention and treatment.
Physical activity has been shown to have systemic anti-inflammatory effects in the body. Exercise results in acute responses and/or chronic adaptations of c-miRNA expression that influence cancer development.
Muscle-strengthening activities such as strength training and aerobic exercises have been shown to reduce the risk of cancer incidence and mortality.
