Joint and movement type

1. Joint and movement type Movements of synovial joints

2. Muscle contraction types • Concentric contraction – force is greater than resistance: muscle contracts and becomes shorter • Isometric contraction – force and resistance is equal: muscle stays same length • Eccentric contraction – force is less than resistance: muscle contracts but lengthens • Isotonic contraction – force remains constant during movement (concentric or eccentric contraction) • Isokinetic motion – constant speed of body segment around joint during muscle contraction • Muscle relaxation – contractile units in muscle are not connecting (myosin heads), contraction force is zero

4. Axes of rotation and planes of movement of the human body. System of naming the movements of the body’s segments greatly assists the description and analysis of motion among sport scientists, PE teachers, coaches and sport medicine practitioners There are three fundamental axes of rotation • The Anteroposterior axis (going front to back) • The Transverse axis (going from side to side) • The Vertical (longitudinal) axis (going from top to bottom) For the rotation of the body these axes pass through the center of mass For the rotation around the joints the axes pass through the joint’s center Synovial joints have axes of rotation around which rotation to movement is permitted. Non-axial - gliding joints (carpals), no axis of rotation Uniaxial - hinge joints (elbow) and pivot joints, only one axis of rotation Biaxial - condylar (knee) and saddle joints, two axes, joints can move two different ways Traxial – ball and socket joints (shoulder), three axes, permit the greatest movement

5. Axes and planes Movement patterns and body planes

6. Movements of the body segments at the joints are given particular names. The reference axis and planes are defined below. The movements are assumed to start with the body in the anatomical position. With the individual; standing upright, facing straight ahead with feet parallel and palms facing forward. Sports, exercise and health science. Page 83-84

7. Agonistic muscle action • Muscles never work alone. In order for a coordinated movement to be produced, the muscles must work together in a group or team, with several muscles working at any one time. • The muscle that produces the desired movement is called the agonist or prime mover. The muscle that produces the opposite movement in order for the agonist to lengthen again is called the antagonist. For example the biceps brachii produces flexion in the elbow and the triceps produce extension in the elbow. • Fixators or stabilizers are muscle that stabilize the origin of the agonist so that the agonist can achieve maximum and effective contraction • Synergist or neutralizers are muscles that, in the same movement, prevent any undesired movements which may occur. Reciprocal inhibition – when the agonist contracts, it usually forces the antagonist to relax: it inhibits the antagonist from contracting Reciprocal: Mathematics (of quantity or function) Related to another so that their product is unity Latin; Re = back Pro = forward

8. Antagonistic pairings Pectoralis / Trapezius Rectus Abdominis / Erector Spinae Anterior deltoids / Posterior deltoids Latissimusdorsi / Deltoids Quadriceps / Hamstring group Tibialis anterior / Gastronemius and Soleus Biceps brachii / Triceps brachii Wrist flexors / Wrist extensors

9. DOMS Delayed Onset Muscle Soreness Muscle soreness occurring at least one day after exercise, possibly caused by structural damage within muscle membranes. Delayed onset muscle soreness is a normal response to unusual exertion and is part of an adaptation process that leads to greater stamina and strength as the muscles recover and build (hypertrophy). Delayed onset muscle soreness is thought to be a result of microscopic tearing of the muscle fibers. The amount of tearing (and soreness) depends on how hard and how long you exercise and what type of exercise you do. Any movement you aren't used to can lead to DOMS, but eccentric muscle contractions (movements that cause muscle to forcefully contract while it lengthens) seem to cause the most soreness. How can you prevent it?