Deliberate hyperventilation technique linked to mental break before police standoff

The B.C. RCMP Divisional Headquarters is seen in Surrey, B.C., on Thursday, Jan. 11, 2024. THE CANADIAN PRESS/Ethan Cairns

CHILLIWACK - A British Columbia man who began to deliberately hyperventilate himself daily before suffering a mental breakdown was sentenced to four years in prison last month after shooting at police in a 2022 standoff.

A psychological assessment found Daniel Hackl's breakdown was likely triggered by "holotropic breathwork," a therapeutic practice involving heavy, rapid breathing exercises that can exacerbate certain mental health conditions. 

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