High Cardiorespiratory Fitness May Shield Men against 9 Types of Cancer

Cardiorespiratory fitness, quantified by the measurement of VO₂ – the maximal volume of oxygen the body can utilize during physical exertion – plays a pivotal role. The higher the VO₂ level, the greater the degree of cardiovascular endurance and resilience exhibited by the circulatory system. Swedish researchers have undertaken extensive investigation into how this health metric influences the risk of developing various forms of cancer.

Insights from the Study

Researchers drew upon data from a comprehensive registry encompassing reference information, medical diagnoses, and fatal incidents among Swedish conscripts. These conscripts commenced their military service between 1968 and 2005.

At the inception of their compulsory service, ranging from ages 16 to 25, the conscripts underwent a standard battery of assessments. This assessment encompassed measurements of height, weight (BMI), blood pressure, muscular strength, and cardiorespiratory fitness.

Conscripts with lower levels of cardiofitness exhibited a somewhat heightened prevalence of obesity. They were also more prone to a history of alcohol and psychoactive substance misuse. Moreover, their parents tended to possess lower educational attainment compared to more cardiorespiratorily robust conscripts.

In total, 365,874 conscripts displayed a low level of cardiorespiratory capacity; 519,652 demonstrated a moderate level; and 340,952 exhibited a high level.

The final analysis comprised over 1 million individuals (1,078,000). Among them, 84,117 (7%) subsequently developed at least one form of cancer during an average monitoring period of 33 years.

Enhanced Cardiorespiratory Fitness Reduces Susceptibility to Multiple Cancer Types

In contrast to individuals with low physical fitness levels during conscription, superior cardiofitness was linked to a diminished risk of developing specific cancer types among men.

1. For rectal cancer – a 5% reduction;
2. For pancreatic cancer – a 12% reduction;
3. For colorectal cancer – an 18% reduction;
4. For brain and cervical cancer – a 19% reduction;
5. For kidney cancer – a 20% reduction;
6. For stomach cancer – a 21% reduction;
7. For esophageal cancer – a 39% reduction;
8. For liver cancer – a 40% reduction;
9. For lung cancer – a 42% reduction.

Study Limitations

This study is an observational analysis, rendering it challenging to establish definitive cause-and-effect relationships. Researchers acknowledge that they did not possess comprehensive data regarding other potentially influential lifestyle risk factors, including diet, alcohol consumption, and smoking. Moreover, they were unable to track changes in cardiorespiratory fitness over time or gather any genetic information about participants.

However, despite these limitations, the findings find resonance in the recommendations put forth by the American Society of Clinical Oncology concerning exercise during cancer treatment, as noted by the scientists.