Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Martin Lakie"'
Publikováno v:
Experimental Physiology, Vol 109, Iss 5, Pp 729-737 (2024)
Abstract Due to Achilles tendon compliance, passive ankle stiffness is insufficient to stabilise the body when standing. This results in ‘paradoxical’ muscle movement, whereby calf muscles tend to shorten during forward body sway. Natural variati
Externí odkaz:
https://doaj.org/article/de16757c193d4c8ca22e71dbec7c952e
Publikováno v:
The Journal of Physiology. 590:2471-2483
Limb resonance imparts a characteristic spectrum to hand tremor. Movement will alter the resonance. We have examined the consequences of this change. Rectified forearm extensor muscle EMG and physiological hand tremor were recorded. In postural condi
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:
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:
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:
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