An Analysis of the Variability of Spinal Reflex Thresholds

Fysiologische effecten van manipulatie van de wervelkolom

“…Het vroege werk van Denslow en Korr (Denslow, 1944;Denslow en Clough, 1941;Denslow e.a., 1947) Korr's theorie van het overprikkelbare segment hield in dat een toename van gammamotorneuron activiteit reflexmatig het alfamotorneuron prikkelt en tot hypertonie leidt. Korr stelde dat manipulatie de gewrichtsmobiliteit vergroot door een spervuur aan impulsen te produceren dat de overprikkelbare gammamotorneuronen uitschakelt.…”

Manual treatment of post-whiplash injury

“…This reduction of spinal motion is caused by a hypertonus of the deep muscles supplied from the spinal segment (Denslow, 1944). This hypertonus is thought to be caused by incorrect spinal-cord setting of the gamma neuron control of intrafusal muscle fibres.…”

The Electromyographic Activity of Thoracic Paraspinal Muscles Identified as Abnormal With Palpation

“…1,2,8 Osteopathic researchers, Denslow and Korr et al, [11][12][13][14][15] conducted studies that they claimed provided evidence of increased segmental muscle activity and sympathetic nervous system output at spinal levels associated with clinically detected segmental dysfunctions. Denslow and Clough 11 examined the electromyographic (EMG) activity of the paraspinal muscles in 16 healthy subjects using needle electrodes and reported that spontaneous electrical activity occurred at blesioned segmentsQ detected with palpation but rarely at normal segments.…”

“…Denslow and Clough 11 examined the electromyographic (EMG) activity of the paraspinal muscles in 16 healthy subjects using needle electrodes and reported that spontaneous electrical activity occurred at blesioned segmentsQ detected with palpation but rarely at normal segments. In later studies, Denslow et al 13,14 reported that when pressure was applied to spinous processes, reflex paraspinal activity occurred at lower pressures on segments detected as abnormal with palpation than adjacent, normal segments.…”

“…There is experimental evidence of increased stretch reflexes in animals, 21,22 but researchers have failed to find evidence of it in subjects with low back pain. 23,24 Because of the shortcomings of studies conducted by Denslow et al [11][12][13][14] and the low level of evidence to support the popular notion of muscle spasm as a cause of tissue texture abnormality, there is a need to reinvestigate the EMG activity of paraspinal muscles underlying sites detected as AbPT, using modern techniques. Fine-wire electrodes record EMG activity from a small region of muscle and are commonly used for recording activity from muscles that are small or deep, or from single muscle fibers.…”