Outline Week 4, Lecture 1 [F'07]

Outline Week 4, Lecture 1 [F'07] - HHS 231 Fall 2007...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
HHS 231 Fall 2007 Outline for Week 4, Lecture 1 “The Hows and Whys of Muscular Fitness Muscular Strength and Endurance Muscular strength = the amount of force a muscle can produce with a single maximum effort Muscular endurance = the ability of a muscle or group of muscles to sustain a level of muscular force (remain contracted) or to contract repeatedly Muscle Physiology Muscles consist of many… muscle fibers (cells) connected in bundles Muscle fibers are made up of Myofibrils Strength training increases… the size of muscle fibers and muscle architecture = hypertrophy Inactivity… reverses the process = atrophy Anatomy of Skeletal Muscle: Types of Muscle Fibers Slow-twitch fibers Are fatigue resistant Don’t contract as rapidly and forcefully as fast-twitch fibers Rely primarily on oxidative energy system Are used predominantly in aerobic activities Fast-twitch fibers Fatigue more quickly than slow-twitch fibers Contract rapidly and forcefully Rely more on nonoxidative energy system Are used predominantly in anaerobic activities Coordination of Muscle Contractions: Motor Units Motor Unit: a motor neuron and all the muscle fibers it is connected to
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
As more force is needed… more motor units are recruited Physiological Effects of Strength Training
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/16/2008 for the course HHS 231 taught by Professor Catherineboshuizen during the Fall '08 term at Oregon State.

Page1 / 5

Outline Week 4, Lecture 1 [F'07] - HHS 231 Fall 2007...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online