Stress on American Football coaches became the major topic in American sports after two of them collapsed in recent days, one undergoing heart surgery on Monday and the other still in hospital.
Denver Broncos coach John Fox underwent aortic valve surgery after collapsing on a golf course as his team enjoyed a week off, while the Houston Texans' Gary Kubiak will be hospitalised until at least Wednesday to undergo tests after suffering the same fate at halftime of his team's home loss to Indianapolis on Monday.
58-year-old Fox has worked for seven NFL teams since his first assistant coaching job in the league in 1989.
52-year-old Kubiak has guided the Texans for seven years after spending the previous 11 as the Broncos offensive coordinator.
It is not known what caused his collapse.
