Revealed: gambling logos and ads seen up to every 13 seconds during big sports games in US

Critics warn of top sports becoming a second-by-second gambling opportunity' as new study shared with the Guardian reveals scale of marketing blitz

Hockey fans are bombarded with gambling logos and adverts - sometimes as often as every 13 seconds - during TV coverage of high-profile games, according to exclusive research shared with the Guardian.

Viewers of June's Stanley Cup finals encountered an average of 3.5 marketing messages from betting firms every minute, a new study by the University of Bristol found.