[1] Univ British Columbia, Sch Rehabil Sci, Vancouver, BC V6T 2B5, Canada
[2] Univ British Columbia, Sch Human Kinet, Vancouver, BC V6T 1Z3, Canada
[3] Univ British Columbia, Allan McGavin Sports Med Ctr, Vancouver, BC V6T 1Z3, Canada
[4] Univ Hosp Freiburg, Div Pneumol, Dept Internal Med, D-79102 Freiburg, Germany
[5] Univ Hosp Freiburg, Div Rehabiliat & Prevent Sports Med, Dept Internal Med, D-79102 Freiburg, Germany
[6] Univ Innsbruck Hosp, Dept Internal Med, Div Cardiol, A-6020 Innsbruck, Austria