Typically, compound movements are closed chain
, which essentially means the hands or feet are in contact with either the ground or with a machine.
However, in closed chain
position in which the hand is holding onto a stable object or surface, the distal attachment is more resistant to moving; for this reason, the proximal attachment usually moves instead, creating a reverse action.
A feedback loop is a closed chain
of causal connections among the elements of a system that is activated when one element meets a certain parameter and sets off a prescribed action.
As eruption continuing in the Kilauuea, the Hawaii Volcanoes National Park has closed Chain
of Craters Road and all east rift zone and coastal trails.
For the first problem (battery-bulb), 13 pairs produced a closed chain
, corresponding to the model of the closed electric circuit, four pairs produced the correct chain, two came up with a chain that had the right structure but the wrong terms and one pair constructed a chain that we were unable to place in any of the foregoing categories.
exercises more closely mimic the demands of running.
maneuvers can be used to compensate for inadequacies at a weak link in the chain.
Since the model contained a closed chain
(both feet were attached to the ground, creating a closed chain
bounded by the legs, ground, and pelvis), only 9 of the 15 DOFs were independent--6 in the legs and 3 at the ball joint between the trunk and the pelvis.