Persistent heart issues forced Brumbies No8 Ita Vaea to retire this week and England test cricketer James Taylor to quit because of heart problems.
Whether those problems would have surfaced if Vaea and Taylor, both young men, were recreational sportsmen has not been revealed but you suspect and hope the fitness levels they've reached to play top-level sport will assist in their recovery.
In recent cases the outcome has not been as fortunate. Former Canadian rugby centre John Cannon died in March aged 35 from a suspected heart attack and Geelong's former Brownlow medallist Paul Couch was out for a cycle that same month and died prematurely at 51.
Last year 29-year-old Welsh league player Danny Jones collapsed in a match and died while 37-year-old former Fiji centre Seru Rabeni died recently.
But Hoani MacDonald, the Southland forward who suffered a heart attack in the 2012 national provincial championship, recovered to start coaching the side.