BPK 142 Lecture Notes - Lecture 13: Freediving Blackout, Lung Volumes, Unconsciousness

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 142
• Professor: Mike Walsh

Document Summary

Week 12: cold environments and human performance: heat balance deltatc ~= m - e +/- r +/- cd +/- cv. Cv = convection: mechanisms of heat loss, radiation - exchange of electromagnetic energy waves emitted from 1 object & absorbed by another. At room temp and naked, 60 % of your heat loss will be by radiation. Manhattan effect infrared heat given off by cement this makes the air 5 degrees hotter than surrounding areas: conduction transfer of heat within a substance, molecule by molecule. Occurs whenever two surfaces with differing temperatures are in direct contact. Metal & plastic chair: why do i feel a difference in temperature: metal chair will conduct heat away from skin faster than a plastic chair, we"re losi(cid:374)g heat rapidl(cid:455). It is (cid:374)ot colder, but it feels colder. Still air is an excellent insulator, while water is an excellent conductor. Heat conduction in water is about 25 times greater than in air (cid:271)e(cid:272)ause .