EDKP 395 Lecture Notes - Lecture 14: Metabolic Disorder, Vastus Lateralis Muscle, Quadriceps Femoris Muscle

• School: McGill University
• Department: Kinesiology and Physical Ed
• Course: EDKP 395
• Professor: Mark Brawley

Document Summary

Impact of muscle oxygenation on muscle metabolic and contractile function: the o2. Alterations in o2 delivery (secondary to changes in muscle blood flow and/or arterial o2 content) evoke changes in muscle pcello2. Mus(cid:272)le adjusts its fo(cid:396)(cid:272)e p(cid:396)odu(cid:272)tio(cid:374) a(cid:374)d po(cid:449)e(cid:396) output (cid:894)i. e. , atp de(cid:373)a(cid:374)d(cid:895) to (cid:862)conform(cid:863) to o2 delivery (pcello2) at a constant motor drive. Muscle metabolic environment is unaltered under conditions of constant motor drive. Ho(cid:449) is (cid:373)us(cid:272)le for(cid:272)e produ(cid:272)tio(cid:374) a(cid:374)d v"o2 maintained during voluntary exercise when. During voluntary exercise, humans must muscle activation (i. e. , recruit more and bigger motor units) to maintain a given level of muscle force production / power output when muscle o2 delivery is reduced. However, this must occur at the expense of muscle metabolic and contractile function (i. e. , accumulation of metabolites leading to fatigue) as well as symptoms of muscular fatigue/discomfort. I(cid:373)pa(cid:272)t of mus(cid:272)le o(cid:454)(cid:455)ge(cid:374)atio(cid:374) o(cid:374) mus(cid:272)le meta(cid:271)oli(cid:272) a(cid:374)d co(cid:374)tra(cid:272)tile fu(cid:374)(cid:272)tio(cid:374): the (cid:862)net dri(cid:448)e.