This BMJ study found that police officers’ risk of sudden cardiac death (SCD) was 34 to 69 times higher during restraints or altercations; 32 to 51 times higher during pursuits; 20 to 23 times higher during physical training; and 6 to 9 times higher during medical or rescue operations, as compared with routine or non-emergency activities. The researchers also found that SCD accounts for up to 10% of all U.S. on-duty police deaths.



References:

Law enforcement duties and sudden cardiac death among police officers in United States: case distribution study. BMJ 2014; 349 doi: http://dx.doi.org/10.1136/bmj.g6534 (Published 18 November 2014).
http://www.bmj.com/content/349/bmj.g6534