Lab Report – 365 28/01/16

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πŸŽ“ πŸ“ LAB REPORT-365 πŸ“ πŸŽ“
#28 Mechanical Analysis: Levers, angles and forces during a squat
STRENGTH SCIENCE SEMINAR PREVIEW

The mechanical analysis of the squat concerns the development of rotational forces throughout the range of motion. This force (called moment force), increases as the barbell moves horizontally away from one’s body joint. That distance is called a moment arm. Think about holding a weight with your arms. Imagine doing a front raise with this weight. The higher you raise your arms, the greater the force is in your shoulder joint (moment force), because the weight is getting further away from your shoulder joint horizontally (moment arm).

Apply this knowledge to the squat, especially in the case of a high bar vs. a low bar squat. When analyzing a squat, you must look at all of the levers. The easiest way to think of the levers is to think of the joints. There is the Back, the Hip (Femur), the Knee, and the Ankle (Shank). When performing a High Bar Back Squat, the torso angle remains in fairly upright position, meaning that the hips don’t travel as far posteriorly. However in order to descend further, the knees will travel further anteriorly. If we take into consideration the moment arm in the knee (travelling anterior or knees forward over toes), you are increasing the moment force in the knee. Using our knowledge of anatomy, you will realize that a high bar back squat is a knee/Quadriceps dominant exercise.

A low bar back squat is the opposite. The hip moment arm travels further backwards, whilst the shank/shins stay relatively vertical, making the low bar back squat a more Hip/Posterior Chain dominant exercise.

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