Zobrazeno 21 - 30
of 50
pro vyhledávání: '"Martin Lakie"'
Publikováno v:
The Journal of Physiology. 564:281-293
In humans, during standing the calf muscles soleus and gastrocnemius actively prevent forward toppling about the ankles. It has been generally assumed that these postural muscles behave like springs with dynamic stiffness reflecting their mechanical
Autor:
Martin Lakie, Ian D. Loram
Publikováno v:
Physiology News. :19-22
Publikováno v:
The Journal of Physiology. 556:683-689
In human standing, gravity causes forward toppling about the ankle joint which is prevented by activity in the soleus and gastrocnemius muscles. It has long been assumed that when people sway forwards the calf muscles are stretched and conversely tha
Publikováno v:
The Journal of Physiology. 551:357-370
These experiments were prompted by the recent discovery that the intrinsic stiffness of the ankle is inadequate to stabilise passively the body in standing. Our hope was that showing how a large inverted pendulum was manually balanced with low intrin
Autor:
Ian D. Loram, Martin Lakie
Publikováno v:
The Journal of Physiology. 540:1111-1124
In standing, there are small sways of the body. Our interest is to use an artificial task to illuminate the mechanisms underlying the sways and to account for changes in their size. Using the ankle musculature, subjects balanced a large inverted pend
Publikováno v:
Exercise and sport sciences reviews. 42(3)
Explanation of motor control is dominated by continuous neurophysiological pathways (e.g., transcortical, spinal) and the continuous control paradigm. Using new theoretical development, methodology, and evidence, we propose intermittent control, whic
Publikováno v:
The Journal of Physiology. 532:879-891
Using the ankle musculature, subjects balanced a large inverted pendulum. The equilibrium of the pendulum is unstable and quasi-regular sway was observed like that in quiet standing. Two main questions were addressed. Can subjects systematically chan
Autor:
Martin Lakie, N. Combes
Publikováno v:
The Journal of Physiology. 523:515-522
A postural hand tremor of enhanced size was induced in eleven subjects. There was rhythmic activity in the posturally active extensor muscles synchronised to the tremor oscillation, which implied an oscillatory modulation of motor neurones. The subje
Autor:
Martin Lakie, N. Combes
Publikováno v:
Experimental Physiology. 84:807-810
SUMMARY The thresholds for detection of a tremor-like movement are described. Detection is poorest at frequencies which correspond to natural tremor. The results are in accord with the failure of persons often to notice that their hands are tremulous
Autor:
Martin Lakie, Kenneth S. Campbell
Publikováno v:
The Journal of Physiology. 510:941-962
The precise control of posture and movement imposes severe constraints on the human neuromuscular system. In particular, to maintain stability, the motor control system must continually react to proprioceptive feedback as the body is perturbed by unp