Kinesiology 2230A/B Lecture Notes - Lecture 6: Muscle Hypertrophy, Myocyte, Skeletal Muscle

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2230A/B
• Professor: Glen Belfry

Document Summary

Muscle size and power: muscle hypertrophy involves an increase in size and skeletal muscle through growth in size of its component cells. If (cid:455)ou are goi(cid:374)g fro(cid:373) (cid:1005)s to 9s, there"s a differe(cid:374)(cid:272)e i(cid:374) cross-sectional area: there"s a differe(cid:374)(cid:272)e i(cid:374) (cid:373)us(cid:272)le h(cid:455)pertroph(cid:455, ex: sprinters are strong. In marathon runners, power and strength is not particularly important. Looking at the sequence of recruitment of the different fiber types: looking at when you have a force during one rep of exercise. Influence of exercise bout intensity on fiber recruitment: similar response occurs when you are doing a rhythmical exercise, as you increase the intensity/po (speed), the recruitment pattern is similar. For (cid:455)ou to re(cid:272)ruit t(cid:455)pe ii(cid:271)/(cid:454) fi(cid:271)ers, (cid:455)ou"ll ha(cid:448)e to (cid:271)e ru(cid:374)(cid:374)i(cid:374)g (cid:373)a(cid:454)i(cid:373)all(cid:455) up the stairs. It is that duration where you will have high recruitments of those type iia fibers. Fiber type variability gender differences: again, points out the large range in fiber percentage (hence performance capacity) normally found amongst individuals.