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Tuesday, April 22, 2014

Barbell Deadlift Analysis


Barbell Deadlift 

Description

The client flexes at the hip and knee while keeping the back and arms straight. The client grips the barbell. In an upward motion, while driving through the heels, the client extends the hips forward until a standing position is achieved. The client reverses the sequence and lowers the barbell to the floor and repeats for desired number of repetitions. Lift the weight by driving the hips forward and avoid pulling with the lower back.


Analysis

The barbell deadlift is a closed kinetic chain exercise due to the feet and barbell both being in contact (fixed) with the floor at the starting position. This exercise is divided into two phases: the lifting phase and the lowering phase.


Joints

The wrist is in flexion through the lifting phase and the lowering phase of the exercise.

The elbow remains in extension through the lifting phase and the lowering phase of the exercise.

The hip is in extension during the lifting phase and in flexion during the lowering phase of the exercise.

The knee is in extension during the lifting phase and in flexion during the lowering phase of the exercise.


Agonist muscles used during concentric contraction or lifting phase of the exercise:

Wrist: (mainly in an isometric contraction) flexor pollicus longus, flexor digitorum superficialis, flexor digitorum profundus, palmaris longus, flexor carpi ulnaris, flexor carpi radialis.

Trunk: (mainly in an isometric contraction) erector spinae and quadratus lumborum.

Hip: bicep femoris, semitendinosus, semimembranosus and gluteus maximus.

Knee: vastus lateralis, vastus intermedius, vastus medialis, rectus femoris.


Agonist muscles used during the eccentric contraction or lowering phase of the exercise:

Wrist: (mainly in an isometric contraction) flexor pollicus longus, flexor digitorum superficialis, flexor digitorum profundus, palmaris longus, flexor carpi ulnaris, flexor carpi radialis.

Trunk: (mainly in an isometric contraction) erector spinae and quadratus lumborum.

Hip: bicep femoris, semitendinosus, semimembranosus and gluteus maximus.

Knee: vastus lateralis, vastus intermedius, vastus medialis, rectus femoris.

References:

Floyd, R.T., 2012. Manual of Structural Kinesiology. Ch 13.

Eric Dempsey
Master Sergeant, U.S. Army Retired
NASM Certified Personal Trainer & Weight Loss Specialist
Graduate Student in Exercise Science at CAL U
Dempsey’s Resolution Fitness
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