Randy Oldman
"In 2006, Radcliffe learned that she and Gary Lough, her husband and manager, were expecting their first child. She continued to run during her pregnancy, but modified her usually grueling training. Radcliffe gave birth to a daughter, Isla, on January 17, 2007."
"Blood volume rises about 60 percent during pregnancy, mimicking the effects of blood doping in which greater blood volume allows more oxygen to be carried to the muscles. Muscles use oxygen to produce ATP or adenosine triphosphate, which fuels muscle contractions. (The volume and speed of this process is aerobic power or VO2max)."
http://www.biography.com/people/paula-radcliffe-13762207#2004-olympic-games-and-setbacks