Exercise and Its Impact on Colon Cancer Growth

Research Findings from The Journal of Physiology

Recent research published in The Journal of Physiology has uncovered a significant connection between exercise and reduced tumor growth in colon cancer. As the baby-boomer generation ages, the median age of the global population rises, leading to an increased risk of chronic diseases, including cancer. Colon cancer, specifically, is the third most commonly diagnosed cancer and the fourth leading cause of colorectal mortality worldwide.

Colon Cancer Trends in High-Income Countries

An article in the BMJ Journal highlights colon cancer as a clear indicator of societal and economic changes in various countries. The incidence of colon cancer is rapidly increasing in nations that were previously not associated with high rates, mirroring trends seen in wealthier countries. In these high-income regions, promoting healthy behaviors, such as regular exercise, is recommended, yet full implementation remains a challenge across the population.

Study Design and Methodology

The study focused on male colon cancer survivors over 40 years old who had completed radiation therapy, chemotherapy, or surgical treatment within the last month. Participants engaged in either acute or chronic high-intensity interval exercise (HIIE) sessions, each lasting approximately 38 minutes, conducted three times a week for four weeks.

Blood samples were collected at baseline and post-exercise to analyze the impact of HIIE on colon cancer cell growth. In the acute group, samples were taken before the session, immediately after, and two hours post-exercise. For the chronic group, samples were collected before the intervention and after the exercise session.

Effects of Exercise on Colon Cancer Cell Growth

Analysis revealed several systemic changes following acute HIIE sessions. Researchers noted a temporary increase in systemic cytokine concentrations, which appeared to correlate with the suppression of colon cancer cell proliferation. However, this effect diminished two hours post-exercise, suggesting that regular exercise may provide repeated acute benefits that deter colon cancer growth. Notably, the chronic HIIE group did not exhibit the same positive results.

Insights from the Research Team

Interestingly, there was no significant reduction in cancer cells within the chronic intervention group. Researchers attributed this lack of change to stable levels of specific markers, such as IGF1 and insulin, which could inhibit tumor initiation and enhance insulin sensitivity. Lead researcher James Devin stated, “We have shown that exercise may play a role in inhibiting the growth of colon cancer cells. After an acute bout of HIIT, there were specific increases in inflammation, which are hypothesized to be involved in reducing the number of cancer cells.” This study is groundbreaking in demonstrating acute changes in colon cancer tumor growth following an HIIE session, aligning with findings from other cancer types.

Limitations of the Study

Several limitations were acknowledged in this pilot study. The findings were constrained by a small participant pool, and additional extraneous factors that may have influenced colon cancer cell growth were not thoroughly examined. Furthermore, the absence of a control group limited comparative analysis of the results.

Conclusion: Implications for Future Research

Despite the limitations, this study adds to the existing body of knowledge regarding the benefits of regular exercise. It holds promise for future health initiatives aimed at combating the global challenge of cancer as a chronic disease.

References

Arnold, M., Sierra, M. S., Laversanne, M., Soerjomataram, I., Jemal, A., & Bray, F. (2017). Global patterns and trends in colorectal cancer incidence and mortality. Retrieved from https://gut.bmj.com/content/66/4/683

Devin, J. L., Hill, M. M., Mourtzakis, M., Quadrilatero, J., Jenkins, D. G., & Skinner, T. L. (2019). Acute high intensity interval exercise reduces colon cancer cell growth. The Journal of Physiology. doi:10.1113/jp277648

Turan, J. (2019). Colon cancer growth reduced by exercise. Retrieved from https://www.eurekalert.org/pub_releases/2019-02/tps-ccg022619.php