Zobrazeno 11 - 20
of 50
pro vyhledávání: '"Martin Lakie"'
Publikováno v:
The Journal of Physiology. 589:307-324
Non-technical summary Homeostasis, the physiological control of variables such as body position, is founded on negative feedback mechanisms. The default understanding, consistent with a wealth of knowledge related to peripheral reflexes, is that feed
Autor:
Martin Lakie
Publikováno v:
Experimental Physiology. 95:441-450
Shooting ability is compromised by involuntary movement. Some of this movement is physiological tremor. Tremor size has a demonstrable inverse correlation with shooting performance. Consequently, factors which affect tremor size should affect shootin
Publikováno v:
Journal of Neurophysiology. 102:460-474
Proprioception comes from muscles and tendons. Tendon compliance, muscle stiffness, and fluctuating activity complicate transduction of joint rotation to a proprioceptive signal. These problems are acute in postural regulation because of tiny joint r
Publikováno v:
The Journal of Physiology. 587:1343-1365
Human balance is commonly described using linear-time-invariant (LTI) models. The feedback time delay determines the position of balance in the motor-control hierarchy. The extent of LTI control illuminates the automaticity of the control process. Us
Publikováno v:
Medicine & Science in Sports & Exercise. 41:198-204
Undisturbed human standing is primarily characterized by sway of the whole body about the ankle joints and is regulated primarily by the calf muscles. Traditionally, in accord with normal ideas of postural control, ankle stiffness, enhanced by spindl
Publikováno v:
The Journal of Physiology. 584:677-692
Using short duration perturbations, previous attempts to measure the intrinsic ankle stiffness during human standing have revealed a substantial stabilizing contribution (65–90% normalized to load stiffness ‘mgh’). Others regard this method as
Publikováno v:
The Journal of Physiology. 584:661-675
During human standing, tonic ankle extensor torque is required to support the centre of mass (CoM) forward of the ankles, and dynamic torque modulation is required to maintain unstable balance. Passive mechanisms contribute to both but the extent is
Publikováno v:
The Journal of Physiology. 577:417-432
While standing naturally and when manually or pedally balancing an equivalent inverted pendulum, the load sways slowly (characteristic unidirectional duration ∼1 s) and the controller, calf muscles or hand, makes more frequent adjustments (characte
Autor:
Ian D. Loram, Martin Lakie
Publikováno v:
The Journal of Physiology. 577:403-416
Ten subjects balanced their own body or a mechanically equivalent unstable inverted pendulum by hand, through a compliant spring linkage. Their balancing process was always characterized by repeated small reciprocating hand movements. These bias adju
Publikováno v:
Journal of neurophysiology. 113(2)
Two frequency peaks of variable preponderance have been reported for human physiological finger tremor. The high-frequency peak (20–25 Hz, seen only in postural tremor) is generally attributed to mechanical resonance, whereas the lower frequency pe