'One of the oldest explanations for baldness in the Western world was the "exhaustion of nervous energy"—that is, the health and capability of the nervous system. In the 1881 book,
American Nervousness, George W. Beard[sic] explains that baldness and many other problems increase at the expense of nervous energy due to the stress and strain of modern life:
"The increasing popularity of baldness is one of the minor but most instructive expressions of nerve sensitiveness. Among savages in all parts of the earth baldness is unusual, except in extreme age, and gray hairs come much later than with us.
So common is male baldness in our large cities that what was once a deformity and exception is now almost the rule, and an element of beauty. One may be bald without being very nervous; but the general prevalence of baldness comes from the general prevalence of nervousness." —George M. Beard (1881)
George Beard called the exhaustion of nervous energy "neurasthenia" and in many ways, the theory was the intellectual stepchild to Hans Selye's 1936 work on metabolic stress.
In Beard'
s view,
the person'
s unfavorable environment caused pattern baldness.
Complementing Beard's environmental view of hair loss was the observation that baldness was noted less often among those engaged in manual labor and more frequently among scientists, academics, ministers, lawyers, and legislators. To advocates of the time, this suggested that simple livin' was hair protective and that "brainy types" were more likely to go bald.'
https://www.dannyroddy.com/weblog/mysteriousconductorhaircycleclock
November 10th, 2017:
'Researchers found that people who exercised well over the national physical activity guidelines for many years were more likely to develop coronary artery calcification (CAC) by middle age.
CAC, which is measured using CT scans, indicates that calcium-containing plaques are present in the arteries of the heart — a predictor of heart disease.
The study included almost 3,200 people. Researchers followed them for 25 years, starting when they were young adults.
At the beginning of the study, and during three to eight follow-up visits, participants reported how often and the types of physical activities they participated in.
Researchers used this information to divide participants into three groups: those who met the physical activity guidelines, those who fell below, and those who exceeded it by at least three times.
The U.S. Department of Health and Human Services’ “
2008 Physical Activity Guidelines for AmericansTrusted Source” recommend that adults do at least 150 minutes a week of moderate-intensity, or 75 minutes a week of vigorous-intensity, aerobic activity.
Vigorous-intensity activities include running, biking, swimming, exercise or dance classes, and strenuous sports.
Moderate-intensity activities include walking, hiking, golfing, home exercises, and gardening.
People who exercised three times the recommended amount — or the equivalent of 450 minutes a week of moderate activity — had a 27 percent higher risk of developing CAC during the study period, compared to those who exercised the least.
The effects of extreme exercise were even greater for white participants.
This group had an 80 percent higher risk of developing CAC. The risk was slightly higher for white men than white women.
Statistically, though, the results based on race and gender were only significant for white men. This is probably because the other groups had too few participants.
The study also reinforced the benefits of regularly meeting the physical activity guidelines.
People who exercised less than the recommended amounts were more likely to have high blood pressure and type 2 diabetes in middle age.'
https://www.healthline.com/health-n...lth-problems#Extreme-exercise-may-carry-risks
