P852Linking myocardial mechanical function to exercise performance: a cardiopulmonary stress echo study in first time London marathon participants. (28th August 2018) - Van Zalen, J J; D'Silva, A; Badiani, S; Bhuva, A; Jones, S; Torlasco, C; Hughes, A D; Manisty, C; Sharma, S; Moon, J C; Lloyd, G