There is one short report published in EMJ Nov 2014 or 2014;31:939-941 – is done by looking at collapse patterns of an athlete during Sudden Cardiac Arrhythmia or Arrest on the field of play.
The method used- Youtube was searched for video clips clearly depicting the sequence of an athlete’s collapse of cardiac origin.
the Conclusions- on the field athletes displaying bowing and or kneeling positions followed by a collapse should be assumed to have a life threatening cardiac event. So a track side Dr should look for these signs and if present should hurry up to the athlete with a defibrillator.
one of the you tube videos was www.youtube.com/watch?v=5Xb0L59DjZg.
this one shows a very sudden dramatic collapse , where the player just falls on his face like a rag doll