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Ch. 9 The Muscular System
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook
Chapter 9, Problem L3.4

Chris is training for his black belt in karate and is working on developing a stronger punch. Which muscles do you recommend that he strengthen to improve his punch? Explain.

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Understand the biomechanics of a punch: A punch involves multiple muscle groups working together to generate force, stabilize the body, and deliver the movement effectively. Key components include the upper body, core, and lower body muscles.
Focus on strengthening the pectoralis major: This chest muscle is responsible for horizontal adduction of the arm, which is a primary motion during a punch. Exercises like bench presses and push-ups can target this muscle.
Strengthen the deltoid muscles: The anterior deltoid (front shoulder muscle) plays a significant role in flexing and moving the arm forward during a punch. Overhead presses and front raises are effective exercises for this muscle group.
Develop the triceps brachii: The triceps are responsible for extending the elbow, which is crucial for delivering the final thrust of a punch. Tricep dips and cable tricep extensions are excellent for building strength in this area.
Enhance core stability and rotational strength: The obliques and rectus abdominis are essential for generating rotational power and stabilizing the torso during a punch. Exercises like Russian twists, planks, and medicine ball throws can improve core strength and punching power.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Muscle Groups Involved in Punching

A strong punch primarily involves the coordination of several muscle groups, including the pectorals, deltoids, triceps, and core muscles. The pectorals help in the initial push of the punch, while the deltoids stabilize the shoulder. The triceps extend the arm, and the core muscles provide stability and power through rotational movement.
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Functional Groups

Core Strength and Stability

Core strength is crucial for effective punching as it allows for better transfer of power from the lower body to the upper body. A strong core stabilizes the body during the punch, enabling the fighter to maintain balance and control. Exercises like planks and rotational movements can enhance core strength, contributing to a more powerful punch.
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Explosive Power Training

Explosive power training focuses on developing the ability to exert maximum force in a short amount of time, which is essential for effective striking in martial arts. This can be achieved through plyometric exercises, such as medicine ball throws and jump squats, which enhance muscle recruitment and speed, ultimately improving the force of a punch.
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Related Practice
Textbook Question

Mr. Bell presents with the inability to move certain muscles on one side of his face. You ask him to make various facial expressions and find that on his right side he is unable to purse his lips, pull in his cheeks, elevate his upper lip, and smirk. What muscles is Mr. Bell unable to contract?

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Textbook Question

Ms. Cho presents with muscle pain in the area around her anterior neck and superior chest. She explains that she has had a respiratory infection over the past 2 weeks that made it hard for her to breathe. What is likely causing her muscle soreness? (Hint: Remember that the origin and insertion of some muscles can switch and that one likely has to breathe more deeply with a respiratory infection.)

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Textbook Question

Elise is a competitive gymnast who strained muscles in her left lower limb doing a tumbling pass. She has pain with extension of her leg and inversion of her foot. Which muscles did she potentially strain?

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Textbook Question

Ms. Hendrix suffered a severe hip fracture that required hip replacement surgery. After an extended recovery period, she is undergoing physical therapy to regain strength and mobility.

Which muscles were likely affected by the hip replacement surgery, and to which parts of the bone do they attach?

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Textbook Question

Ms. Hendrix suffered a severe hip fracture that required hip replacement surgery. After an extended recovery period, she is undergoing physical therapy to regain strength and mobility.

Which actions could Ms. Hendrix perform to strengthen these muscles?

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Textbook Question

Match the term with its description:

_____Brevis     

_____Digitorum     

_____Hallucis     

_____Rectus     

_____Flexor      

_____Pronator

a. Related to the fingers/toes

b. Straight

c. Short

d. Decreases the angle between bones

e. Turns palm down

f. Related to the hallux (great toe)

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