PHTY102 Lecture Notes - Lecture 7: Contracture, Confidence Interval, Spasm
PHTY week 7 LB Principles of Passive Movement II
Passive movement
- Movement of a joint or body segment by a force external to the body, without
active, voluntary muscle contraction by the individual
oIe. Therapist moves joint/body segment for individual
- Greater range of joint movement is able to be achieved than by volitional effort
What is happening when we perform passive movements?
- Passive extensibility of skeletal muscles – lengthening without muscle activation
- Passive extensibility is an important component of total muscle function – it allows
for the maximal length of both non-activated and activated muscles (Gajdosik 2001)
- Passive forces increase exponentially (curvilinear increase) as the muscle is stretched
to its maximal length
Length-tension curve
- As muscle is passively lengthened from its resting position it reaches a point where
the first passive resistance to the movement (stretch) can be felt and measured ie.
Initial passive resistance (R1)
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- As the muscle is lengthened beyond this initial length, greater passive resistance is
recorded until a maximal passive resistance is reached (R2) ie. End of range
- Stretch beyond this point may result in rupture at the ends of the muscle fibres
Total Components of a Length-Tension Curve
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Document Summary
Phty week 7 lb principles of passive movement ii. Movement of a joint or body segment by a force external to the body, without active, voluntary muscle contraction by the individual: ie. Greater range of joint movement is able to be achieved than by volitional effort. Passive extensibility of skeletal muscles lengthening without muscle activation. Passive extensibility is an important component of total muscle function it allows for the maximal length of both non-activated and activated muscles (gajdosik 2001) Passive forces increase exponentially (curvilinear increase) as the muscle is stretched to its maximal length. As muscle is passively lengthened from its resting position it reaches a point where the first passive resistance to the movement (stretch) can be felt and measured ie. initial passive resistance (r1) As the muscle is lengthened beyond this initial length, greater passive resistance is recorded until a maximal passive resistance is reached (r2) ie. end of range.
