Concentric/ Eccentric

T or F GA eccentric contractions are easy to do?

False, GA eccentric does not exist!

T or F Concentric contractions occur only with resistance?

False, with or without resistance

Eccentric Descending Wall Squat describe what happens reverse muscle action?

Force= gravity, Resistance= Muscle (origin)

Eccentric contraction normally occur coming out of the ?

Function

• Gluteus medius, eccentric contraction position GM?

GM: supine as the glut med slows the movement of the leg from an ABD position to neutral (45 to 0) (requires external or manual resistance with hand on lateral distal femur)

GM position quads Concentric?

Side lying as the knee extends from 135 to 0/ Standing hip 90 abduction- knee extension. 135-0

Describe the position for the gluteus Medius to perform hip ABD GA?

Sidelying HIP ABD (bottom leg moves off table down toward floor) from 0-45 Hand stand, person hanging onto pole sideways

Describe the position for the gluteus medius to perform hip abduction AG?

Sidelying hip ABD (top leg moves toward the ceiling) from 0 to 45 / Standing 0-45

T or F Apply resistance to the same area regardless of whether you are strengthening a muscle concentrically or eccentrically. Determine hand placement for a concentric contraction, and your and placement stays the same for an eccentric contraction.

TRUE ALL DAY

3 rules to know about concentric/eccentric contractions and gravity?

1. The body position is the same for both concentric and eccentric contractions AG 2. The body position is the same for both concentric and eccentric contractions GM 3. There is no such thing as an eccentric contraction GA

What is a eccentric contraction simple?

A lengthening contraction

If you put the pt in prone, you are now working the hamstrings ?

AG

Example: Gluteus Medius performs Hip?

Abduction

AN AG position in the same for concentric and eccentric contractions?

Concentric hip flexion AG - short sitting | Eccentric hip flexion AG - short sitting

Lets talk about wall slides and reverse muscle action. Explain the ascending part of a wall slide squat? Starting with knees bent to standing straight.

CKC, Quad providing knee extension, but the Femur is moving on the Tibia, Origin moves twoard the insertion

A shortening in the muscle during the contraction?

Concentric

A GM position is the same for concentric and eccentric contractions. DF GM?

Concentric ankle DF GM- Sidelying | Eccentric ankle DF GM sidelying

• Quadriceps femoris at the knee: a______ contraction occurs when you perform knee extension. Patient position causes the muscle to extend the knee AG, GA, or GM.

Concentric contraction

Gluteus medius, eccentric contraction position GA?

DOES NOT EXIST!

Quadriceps femors position GA eccentric contraction?

IT DOESN'T EXIST

Describe position of concentric contraction for the quadriceps AG?

Short sitting as the knee extends from 90-0

GA position Quads Concentric?

Prone as the knee extends from 90 to 0 / standing knee 90-0

Reading Card: - A LAQ in S/L would be gravity minimized for both concentric and eccentric. See rule 2. With the pt in S/L extending the knee would be a GM concentric contraction for the quads, and if you wanted to give manual resistance, it would be on the anterior portion of the lower leg. The eccentric portion would be the movement from 0* of knee extension to knee flexion, with resistance at the anterior lower leg ("resist me but let me win").

Reading Card: - A LAQ in S/L would be gravity minimized for both concentric and eccentric. See rule 2. With the pt in S/L extending the knee would be a GM concentric contraction for the quads, and if you wanted to give manual resistance, it would be on the anterior portion of the lower leg. The eccentric portion would be the movement from 0* of knee extension to knee flexion, with resistance at the anterior lower leg ("resist me but let me win").

Reading Card: A LAQ in sitting is a concentric contraction of the quads AG. You are activating the quad to extend the knee, which lifts the lower leg against the force of gravity.

Reading Card: A LAQ in sitting is a concentric contraction of the quads AG. You are activating the quad to extend the knee, which lifts the lower leg against the force of gravity.

Reading card: Gluteus medius: an eccentric contraction occurs when you perform hip ABD (You must begin in the shortened range and end in the lengthened range). Patient position causes the muscle to ABD the hip eccentrically AG (the force the muscle is resisting is gravity) or GM (the force the muscle is resisting is external - manual).

Reading Card: Gluteus medius: an eccentric contraction occurs when you perform hip ABD (You must begin in the shortened range and end in the lengthened range). Patient position causes the muscle to ABD the hip eccentrically AG (the force the muscle is resisting is gravity) or GM (the force the muscle is resisting is external - manual).

Reading Card:- The eccentric portion of the LAQ (going from 0* of knee extension to 90* of flexion in sitting) is also AG. Gravity wants to force the leg down, but the muscle is resisting that pull and bringing the lower leg down slowly. See rule one. This is also why the force in an eccentric contraction is the gravity and the resistance is the muscle. The muscle is resisting the pull of gravity and controlling how fast you lower the leg.

Reading Card:- The eccentric portion of the LAQ (going from 0* of knee extension to 90* of flexion in sitting) is also AG. Gravity wants to force the leg down, but the muscle is resisting that pull and bringing the lower leg down slowly. See rule one. This is also why the force in an eccentric contraction is the gravity and the resistance is the muscle. The muscle is resisting the pull of gravity and controlling how fast you lower the leg.

Describe the motion of the muscle during a concentric contraction?

Starts in a lengthened range and then ends in the shortened range

*Describe mm range where an eccentric contraction starts out?

Starts out shortened range and ends in the lengthened range.

Basic rule for AG with concentric and eccentric?

They must be in the same position for AG position to work.

During an eccentric contraction the muscle attempts to resist movement or an external force, causing the motion?

To be slowed

T or F Eccentric contractions are not utilized in GA positions since there is nothing to resist?

True

T or F when you are applying manual resistance; place hand on the same side of the body as where the muscle lies?

True

Rule of thumb when describing a GM eccentric contraction. What do you always add at the end?

With Resistance

For Quads (knee extension) quads are on ______ femur, place hands on ____ distal tibia for eccentric resistance

anterior

Hip ABD - glut med is on _____ femur, place hands on _____ distal femur

lateral

Elbow ext - triceps are on ____ humerus, place hands on ____ distal forearm

posterior

Quadriceps femors position AG eccentric contraction?

short sitting as the muscle slows the movement from ext to flex from 0 to 90

Gluteus medius, eccentric contraction position AG?

sidelying hip ABD (top leg moves from ceiling down toward table) from 45

• Quadriceps femors position GM eccentric contraction?|

sidelying with top leg supported; quads of top leg slow the movement from ext to flex from 0 to 135 (requires external or manual resistance with hand on anterior distal tibia)

Describe the position for the gluteus Medius to perform hip ABD GM?

supine hip ABD from 0 to 45