User talk:Profcarley

Force Coupling
In the study of kinesiology, one of the most essential components of human interaction and function is that of the shoulder. A critical component to maximizing the shoulder motion is the positioning of the scapula, which contains the socket of the shoulder joint. Our muscles are situated in the front and back of the scapula at varios angles for improved coordination of muscle contractions. Muscle contractions in opposite directions on either side of the scapula's center of mass (COM) will create an event referred to as "force coupling". The term force coupling is defined as "A pure force couple results in rotational motion only, since there are no unbalanced forces. In the musculoskeletal system, all of these condidions are seldom met, so pure force couples are rare" (Oatis, 2004, p. 9). In understanding human movement, the concept of pure force coupling presents a conflict the with normal variety and functional adaptations of the human body. As a result, the term anatomical force coupling is exchanged in recognition of those needs for the variety of interactions in our daily activities. In this context, "two muscles pulling in opposite directions and together causing rotation of the scapula form what is known as an anatomical force couple" (p. 156). The scapula is not the only joint in the body that demonstrates the event of force coupling. The cervical motions are noted as having the capacity for "activation of the trapezius muscle and sternocleidomastoid muscle to create contralateral cervical rotation. These muscle produce opposing force vectors. The interaction of these force vectors produces rotation and is an example of an anatomical force couple. Force couples can theoretically produce pure rotational movements by canceling opposing translatory components. They also can produce motion in directins not available form a signle muscle's line of action" (p. 507-508.).

Oatis, C. A. (2004). Kinesiology: The mechanics and pathomechanics of human movement (2 ed.) Baltimore, MD: Lippincott Willaims & Wilkins Profcarley (talk) 14:59, 6 December 2008 (UTC)

Your article submission Submissions/Force Coupling (Shoulder-Biomechanics)


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Thanks for your submission to Wikipedia, and happy editing. Hasteur (talk) 14:31, 22 July 2013 (UTC)