#099 The Science of Exercise for Cancer | Kerry Courneya, PhD - FoundMyFitness Recap

Podcast: FoundMyFitness

Published: 2025-03-03

Duration: 1 hr 51 min

Guests: Kerry Courneya

Summary

Exercise is not just beneficial for general health; it's a therapeutic intervention in cancer care, improving treatment outcomes and reducing recurrence.

What Happened

Exercise has transitioned from being an optional part of cancer care to a fundamental therapeutic intervention. Dr. Rhonda Patrick and Dr. Kerry Courneya discuss how exercise can recalibrate tumor biology, enhance treatment tolerance, and improve survival outcomes in cancer patients. Dr. Courneya emphasizes that regular physical activity is crucial, with evidence suggesting it can lower the risk of several cancer types, including colon, breast, and endometrial cancers.

Dr. Courneya has contributed significantly to the American Cancer Society's Physical Activity Guidelines for Cancer Survivors, highlighting that even high-risk individuals, such as smokers or those with a family history, can benefit from exercise. He explains that exercise helps manage obesity, a major risk factor for cancer, and its benefits extend to reducing cancer risk irrespective of obesity status.

The episode delves into the mechanisms by which exercise influences cancer prevention and treatment, such as enhancing immune function, improving blood flow to tumors, and reducing circulating tumor cells. Dr. Courneya also points out that vigorous exercise seems to offer the most substantial benefits for cancer prevention compared to moderate-intensity activities.

Exercise is portrayed as a form of 'prehabilitation' for cancer patients, preparing them for rigorous treatments like chemotherapy and radiation by improving their physical fitness and helping manage side effects like fatigue and sleep disturbances. Dr. Courneya highlights the importance of combining aerobic exercise with resistance training to build muscle mass, crucial for survival during cancer progression.

Emerging research suggests that exercise could act as a form of cancer immunotherapy. It enhances drug effectiveness by improving blood flow to tumors, thereby increasing the delivery of chemotherapy drugs and oxygen, making treatments like radiation more effective.

Dr. Courneya discusses new frontiers in exercise oncology, including the potential of high-intensity interval training as a standalone treatment in certain low-grade cancers. He explains how exercise may modify tumor biology and reduce cancer metastasis.

Finally, Dr. Courneya emphasizes that exercise offers psychological benefits, reducing anxiety and fear of cancer recurrence, which are significant concerns for patients. This holistic approach to cancer care underscores exercise as a critical component across the entire continuum of cancer treatment and survivorship.

Key Insights

• Regular physical activity can lower the risk of colon, breast, and endometrial cancers, with vigorous exercise providing the most substantial preventive benefits compared to moderate-intensity activities.
• Exercise acts as a 'prehabilitation' strategy for cancer patients, improving physical fitness to better tolerate treatments like chemotherapy and radiation, while managing side effects such as fatigue and sleep disturbances.
• Emerging research indicates that exercise can enhance the effectiveness of cancer treatments by improving blood flow to tumors, increasing the delivery of chemotherapy drugs and oxygen, and thereby making radiation therapy more effective.
• High-intensity interval training is being explored as a potential standalone treatment for certain low-grade cancers, with evidence suggesting it may modify tumor biology and reduce cancer metastasis.