EFTI: Basic Muscle Physiology

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Muscle Strength

specific to the ROM through which it is developed (Principle of Specificity)

should strength train in as many planes of movement as possible

Muscle Endurance

ability to sustain sub-maximal muscular activity

Key structures of the musculoskeletal system? How is skeletal muscle organized?

- Bone
- tendon
- Epimysium
- Permysium
- Fascia; Fasciculus; Fascicles
- Endomysium
- skeletal muscle
- Sarcoplasm
- Myofibril

Epimysium

the outer most layer that surrounds/covers the entire muscle

Permysium

around - (surrounds muscle bundle), the connective tissue that covers the bundles

Endomysium

smallest unit/connective tissue that covers the individual muscle cells

Fascia (Fasciculus), Fascicles

fibrous connective tissue, extends to the tendons which attach to coverings of adjacent muscles: small bundles of fibers wrapped with connective tissue; groups of muscle fibers

Sarcoplasm

the cytoplasm of a muscle fiber (cell)

Myofibril (where the contraction takes place)

are comprised of sarcomeres in series. unit of muscle fiber made up of smaller units that contract (sarcomeres)

Where does muscle contraction take place?

Myofibrils and Sarcomeres
- myofibrils are comprised of sarcomers in series
- sarcomeres are the smallest functional unit of muscle tissue

How does muscle contraction take place

Actin moves towards myosin.

Types of Muscle are there in the human body?

- smooth (blood vessels, bladder, uterus, GI tract)
- cardiac (heart - straited muscle)
- Skeletal (voluntary contol, straited muscle)

Sliding Filament Model

- filament =
- when a muscle contracts its a series of thousands of small units (sarcomeres) shortening
- when sarcomere contracts the thin actin filaments are moved past the think myosin filaments
- this results in a larger region of overlaps between the two sets of filaments, and causes the overall length of the sarcomere to shorten

Motor Unit

The motor neuron and all the muscle fibers it innervates.

The different types of muscle actions and how do they differ from one another?

- ISOmetric (Muscle Tension = Muscle Load); tension is developed in the muscle with no change in muscle length - no movement.

- CONcentric Muscle Tension > Muscle Load; Muscle shortens while developing tension - movement

- ECCentric Muscle Tension < Muscle Load; muscle is trying to shorten but is being forced to lengthen - movement

DOMS and what causes it...

Delayed Onset Muscle Sorenes = Eccentric contration (an performing exercises which the body is not used to) is assicoated with DOMS.
- worse 24-48 hours after workout
- thought to be microscopic tears (microtrauma) to the muscle and swelling in and arouind the muscle

Three types of muscle training...

- ISOtonic Muscle Contraction
- ISOmetric Muscle Contraction
- ISOkinetic Muscle Contraction

ISOtonic Muscle Contraction

- also called dynamic contractions/actions
- Joints are moved through full ROM
- Concentric and Eccentric are isotonic
- Free weights and machines
- force exerted by the muscle is not constant; it varies according to the mechanical advantage of the joint

ISOkinetic

- Contrations during which a muscle contract and shortens at a constant speed
- Requires special equipment that detects when muscle is speeding up and increases the load to slow down again
- rehab settings

ISOmetric

- muscle contracts but doens not shorten (giving no movement)
- used to develop static strength
- muscle gains strength only at the angle you use in the exercise
- isometric training is not sufficient on its own; you need to combine it with isotonic training
- causes an increase in blood pressure and decrease in blood flow to heart (not recommended for clients with heart disease or high blood pressure

Muscle Fiber Types

Born with a predetermined amount of these...
- Type 1 ("slow twitch" or "slow oxidative")
- Type II A ("intermediate" or "fast oxidative")
- Type II B ("fast-twitch" or "fast-glycolytic fibers") - don't use

Type 1 ("slow twitch" or "slow oxidative") - small

- small (fiber size)
- aerobic (predominant energy system)
- slow (speed of shortening)
- good (resistance to fatigue)
- endurance (primary usage)

Type II A ("intermediate" or "fast oxidative")

- intermediate (fiber size)
- intermediate (predominant energy system)
- intermediate (speed of shortening)
- moderate (resistance to fatigue)
- moderate activity (primary usage)

Type II B ("fast-twitch" or "fast-glycolytic fibers") - don't use

- large (fiber size)
- anaerobic (predominant energy system)
- fast (speed of shortening)
- poor (resistance to fatigue)
- speed and power (primary usage)

Rep ranges for various goals:

- power: (single-effort) 1-2; (multi-effort) 3-5
- hypertrophy: 6-12
- strength: < (or equal to) 6
- endurance: > (or equal to) 12

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