Research Blog

ADHD is inhibited by sport participation

Children participating in organized sports are less likely to report ADHD symptoms even after controlling for overall physical activity.

ADHD is a disease with symptoms defined by its name, inattention and hyperactivity, with onset in childhood. Although symptoms present in childhood, the disease can often go undiagnosed into adulthood. ADHD can be particularly debilitating, leading to decreased classroom productivity and worse job performance. It's thought that TV and other electronics have contributed to the rise of ADHD. One recently published study out of Australia found that children ages 9-11 who participated in organized sports were less likely to have ADHAD symptoms. (Associations between organised sport participation and classroom behavior outcomes among primary school-aged children, 2019. Watson A, et al.). This association held up even after adjusting for overall physical activity.

The authors suggest that parents may have another reason to consider organized sports as a means of physical activity for their children. 

Prostate Cancer Decreases with Fitness


Prostate cancer occurs at lower rates and has reduced mortality in those who are physically active. 

Prostate cancer is the most common cancer to afflict American men, with one in six men being diagnosed with prostate cancer at some point during their lifetime. Adding it all up, over 200,000 Americans are diagnosed with prostate cancer every year. Fortunately, the prognosis of prostate cancer is relatively good, especially if diagnosed early. Nonetheless, prostate cancer remains the second most common cause of cancer death in males (second to lung cancer, the number one cause of cancer fatalities in both men and women, but ahead of colorectal cancer). 

Risk factors for prostate cancer include increased age and black race. Asian men are at reduced risk. In addition to their higher incidence of prostate cancer, black men tend to develop more aggressive forms of prostate cancer. These risk factors are not modifiable, are there any modifiable risk factors?

Diet and exercise have both been found to be associated with risk of developing prostate cancer. Diets high in fat have been shown to increase risk of prostate cancer. One epidemiological study found Hawaiians were far more likely to develop prostate cancer if they had high dietary intake of beef or high-animal fat products (Animal fat consumption and prostate cancer: a prospective study in Hawaii, 1994. Le Marchand, et al.). Subsequent studies have supported this association between high-fat diet and prostate cancer. 

Two studies have found prostate cancer to be reduced with physical activity. Although smoking has been linked with many cancer, it has not been linked with prostate cancer. One study found that there was a reduction in the incidence of prostate cancer in individuals who reported participating in vigorous physical activity. (Does physical activity reduce the risk of prostate cancer? A systemic review and meta-analysis, 2011. Liu, et al.). This link was particularly strong for individuals who reported physical activity at work. Another study demonstrated a reduced risk of fatal prostate cancer in individuals who reported physical activity (Risk factors for prostate cancer incidence and progression in the health professionals follow-up study, 2007. Giovannucci, et al.).

Although smoking has been linked with many types of cancer, it has not been linked with prostate cancer. 

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