Since intrafusal
stretch receptor discharge frequency from Ia afferents can contribute up to 30% of the motoneuron excitation (Gandevia, 2001), SS-induced reductions in afferent excitability could adversely affect muscle force.
A stretch should be held for at least 20 seconds to fire the
stretch receptor that tells the muscle to relax.
An increase in tidal volume relieves air hunger, possibly by increasing pulmonary
stretch receptor cycle amplitude.
(39.) Hunt CC, Kuffler SW:
Stretch receptor discharges during muscle contraction.
Birmingham described the
stretch receptor in the crustacean foregut that functions at different times, either as a strain gauge or a volume sensor.
McIntire, however, doesn't think the flow deforms the membrance enough to activate a
stretch receptor. Instead, he theorizes that large molecules at the cell surface stick out and unravel or undergo some other change in response to flow, and that this change may trigger a response.
Each pair of MROs has two
stretch receptor (SR) neurons, a large, high-threshold phasic neuron and a smaller, low-threshold, tonic one.
There have been no measurements yet made to determine whether either neuro-modulator is released peripherally; however, since the
stretch receptor both contains and responds to each substance, it is possible that GPR2 releases either or both to effect gain control through negative feedback.
What's more, an increase in pulmonary
stretch receptor activity leads to inhibition of cardiac vagal neurons resulting in an elevation of heart rate or sinus tachycardia.
The goal of this research is to understand the functional roles of the thoracic
stretch receptor, especially anteriorly located ones, which would be closely related to segmental movements.
During laryngoscopy with conventional Macintosh blade, its tip is placed in the vallecullae to lift the epiglottis which stimulates the
stretch receptors in the epipharynx.
In the theory, the pelvic floor muscle forces the vaginal membrane to stretch against the suspensory ligaments to stimulate the micturition
stretch receptors. Laxity in the membrane or suspensory ligaments may activate
stretch receptors, which are perceived by the cortex as urgency, frequency, and nocturia untimely.