Young man in vigorous good health with right ventricular dilatation on echocardiogram

patient is a fighter pilot

• Describes disproportionate increase in pulmonary artery pressure and right ventricular work during exercise. [101]
• The right ventricle increases in size during prolonged exercise (the Ironman triathlon), whereas the left ventricle's size decreases. [102]
• The cross-sectional area of the proximal right coronary artery was 40% larger (p<0.01) in a group of ultradistance runners, versus a control group of inactive men. [103]
• Editorial on the Haskell paper. "It is intriguing to hypothesize that the increase in the right coronary artery area in these ultrmarathoners may be due to chronic hypertrophy of the right ventricle as opposed to the left ventricle in response to prolonged and intense endurance training." [104]
• The following is idle speculation: This article reports a positive correlation between testosterone and spatial abilities. Could this carry over to pilots, who need good spatial abilities? If so, could it influence the sex ratio of their offspring? [105]
• Excess of females, only after onset of multiple sclerosis in the father and, to a lesser degree, the mother. [107]
• Excess of females. [108]
• Twice as many females as males were born to diabetic mothers. [109]
• First of 4 letters about the Rjasanowski article. [110]
• The odds of having a son increase when the father is older than the mother, and increase in proportion to the difference. Interestingly, the age difference was maximal in 1947 (in Liverpool, at least), which might explain the falling proportion of male births since 1950. The age of the parents alone has a weak effect on the child's gender. [111]
• Fails to confirm findings of the Manning paper above. [112]
• This paper and the Bernstein paper debate factors affecting sex ratios in mammalian offspring. [113]
• Debates the James paper. Interesting discussion of sex ratio genes. [114]
• Declining proportion of males since 1951. [118]
• Declining proportion of males since 1950. [119]
• Declining proportion of males since 1950. Emphasizes that male proportion increased dramatically during World War II, so post-1950 trends may have element of regression-to-the-mean. [120]