Contralateral influences on patellar tendon reflexes in young and old adults
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Differential effects of stimulus characteristics during knee joint perturbation on hamstring and quadriceps reflex responses
2011, Human Movement ScienceCitation Excerpt :This movement could have elicited afferents from the contralateral side of the body which might have influenced quadriceps activation of the investigated leg. Using patellar tendon taps for the conditioning and the test stimulus, Kamen and Koceja found a short latency inhibition of ipsilateral quadriceps responses at 25 ms and a longer latency facilitation at 75 ms after the contralateral conditioning stimulus (Kamen & Koceja, 1989). Assuming that alteration of contralateral quadriceps length due to pelvis rotation starts with the ipsilateral anterior tibial displacement, the short latency inhibition should have influenced the onset of ipsilateral quadriceps responses during P1, while the longer latency facilitation should have been effective during P3.
Aging-related neuromuscular changes characterized by tendon reflex system properties
2005, Archives of Physical Medicine and RehabilitationCitation Excerpt :Clarkson42 did not find any difference in td between young and old, but others reported considerable prolongation in td with aging.6,9 Because the subject’s limb could move freely and the interval from the hammer strike to the onset of limb movement was measured, the td (eg, 83.4ms for the inactive young) reported by Clarkson was far longer than those in 2 other studies6,9 (≈59ms, 55±24.1ms, respectively). Strict isometric conditions were used in the present study to minimize nonreflexive components that may contribute to joint torque and/or latency.
The effect of quadriceps-electrocutaneous stimulation on the T-reflex and the H-reflex of the soleus muscle
2003, Clinical NeurophysiologyDecline in motor functions in aging is related to the loss of NMDA receptors
2001, Brain ResearchCitation Excerpt :The mechanism of muscle stiffness seen in the course of aging is seemingly different. At least two opposite mechanisms, i.e., (1) a decrease in mono- and polysynaptic reflex responses [3,4,17,48,57] and (2) an increase in the muscle resistance to passive movements [57] seem to operate in parallel in the aging human and rat muscles. Our recent study has shown that muscle stiffness in old rats is almost independent of the reflex activity and results from an overgrowth of inflexible connective tissue that replaces active muscle fibers [57].
Age-related muscle stiffness: Predominance of non-reflex factors
1997, NeuroscienceAge-dependent effects of muscle vibration and the Jendrassik maneuver on the patellar tendon reflex response
1996, Archives of Physical Medicine and Rehabilitation