Gait initiation and dynamic balance control in Parkinson's disease.
Below-knee amputees lose the functional use of the ankle muscles, which are critical during walking to provide body support, forward propulsion, leg-swing initiation and mediolateral balance.
Three-dimensional (3D) forward dynamics simulations of amputee and non-amputee walking were generated to identify muscle and prosthesis contributions to amputee walking mechanics, including the subtasks of body support, forward propulsion, leg-swing initiation and mediolateral balance.
The time interval between fall initiation (loss of balance) to fall impact ranged from about 700 ms (for a rapid trip) to 3000 ms (for a fall related to incorrect weight shifting); and the corresponding number of video frames ranged from 10 – 45.
In order to further test the concept of balance between initiation and development, we decided to artificially perturb the primordium initiation process and study the consequences on the development process.
There was a significant difference in cumulative fluid balance at initiation of RRT between hospital survivors and non-survivors.
Lastly, we used gravistimulated plants to further study the balance between initiation and emergence and showed that gravistimulation enhances emergence.
This is consistent with the existence of a balance between initiation and emergence that was predicted by the model and observed in the mutant analysis.
Moreover, the global qualitative behaviour of the model (balance between initiation and emergence) was preserved over a large range of parameters values, supporting the idea that the behaviour of the system itself derives from its governing rules and concepts.
Several types of proangiogenic mediators have been identified to control and balance the initiation and maintenance of angiogenesis.
A controlled balance between initiation and downregulation of immune responses (peripheral tolerance) is important for maintaining immune homeostasis, whereas dysfunctional immune regulation may lead to chronic inflammation or autoimmunity [ 29].
