EHS 230 Lecture Notes - Lecture 9: Anatomical Plane, Horizontal Plane, Sagittal Plane
19 Jun 2018
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Lecture 9:
Topics: Resistance training
Mechanical advantage
Types of levers
Body Planes
Types of Levers
First class lever- between 2 levers produces many torques
Second class lever- is at one end
- Muscle has more freedom to move
- least common lever
Third class lever- is at one end close, slightly right of where second class lever is
Not efficient but very common
Resistance training of biomechanics
Musculoskeletal system
- Made up of bones, tendons and muscle to help people move
- Muscles act on bones and initiate joint movement
- Fibers can only contract
- Muscle origin- 1st attachment (arm attached to chest)
- Muscle insertion- 2nd attachment (finger attached to hand)
Agonist- muscles that help movement
Antagonists- muscles that do not generally help with movement
Synergist- two + muscles used for movement
Stabilizer- muscles that support body during movement
Muscle force-
comes directly from muscle
Resistive force- comes from outside of the body and from an object
- Chair is a resistive force while being pushed
Moment arm- smallest distance b/w two locations
Torque- force x moment arm
Lever- stiff body part of body that acts upon applied torque
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
First class lever- between 2 levers produces many torques. Muscle has more freedom to move least common lever. Third class lever- is at one end close, slightly right of where second class lever is. Made up of bones, tendons and muscle to help people move. Muscles act on bones and initiate joint movement. Muscle origin- 1st attachment (arm attached to chest) Muscle insertion- 2nd attachment (finger attached to hand) Antagonists- muscles that do not generally help with movement. Resistive force- comes from outside of the body and from an object. Chair is a resistive force while being pushed. Lever- stiff body part of body that acts upon applied torque. Side to side of a person but vertical. Front to back of a human and vertical. Joints and muscles in body are 3rd class and less than 1. Ma= ratio of muscle"s moment arm to resistive force moment arm. Ma less than 1 is not efficient.
