[1] Uppsala Univ, Dept Physiol, Uppsala, Sweden
[2] Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden
[3] Swedish Sch Sports & Hlth Sci, Astrand Lab Work Physiol, Stockholm, Sweden
[4] Karolinska Univ Hosp, Dept Anesthesia & Intens Care, Stockholm, Sweden