Well quite a few stalwarts of the amateur game are still fairly active if RRF members are any gauge of such things. I cannot help feeling it's the pro era players that are part of a worrying trend. I wonder if it's not more to do with bulking up their muscle weight to adapt to the higher collision rate in the modern game; rather than the collisions themselves.There have been several studies that focus on the possible adverse effects of creatine use and the heart, kidney or liver function in healthy individuals.
Another discussion on here about Sione Tuitupu Lauaki who was just 35 and his death comes less than two years after the similarly untimely passing of All Blacks great Jerry Collins. The cause of Lauaki death hasn’t been disclosed. Lauaki was forced to end his playing career in 2012 after routine medical tests in France detected kidney and heart problems.
Van der Westhuizen was yet another participant in the 1995 World Cup final to die. Jonah Lomu died of cardiac arrest at 40 in 2015 after a kidney disorder had cut short his career. And Ruben Kruger, the team’s outstanding back row forward, died at 39 in 2010 after a 10-year struggle with brain cancer.
Munster Rugby Union head coach Anthony Foley has died suddenly two weeks short of his 43rd birthday. The condition, acute pulmonary oedema, was caused by "a heart rhythm disorder".
Gardens Rugby Club player Ricardo Kiewiets, 26, from Daleview in Despatch, is believed to have suffered a heart attack within an hour of the match ending.
source Kenya
There are many more less high profile examples out there on the www.