Pneumatic Resistance

Pneumatic Resistance

 

one of the main elements of pneumatic automatic control; impedes the free flow of air or a gas to produce a pressure gradient.

The total pressure gradient in a pneumatic resistance is made up of the gradients in the individual areas of the flow (at the input, the output, and inside the element). A distinction is made between constant resistances, which are nonadjustable or manually adjustable, and variable resistances, which are automatically controlled. Nonadjustable constant resistances are usually made in the form of a very constricted channel of constant cross section and a certain fixed length. Adjustable constant resistances are made in the form of a “fixed seat-movable part” combination, such as cone-cone or cone-cylinder; the relative position of the parts, which is selected during adjustment, controls the cross section of the resistance’s passage and hence the pressure drop. The cross section is unchanged during operation in all constant pneumatic resistances.

Variable pneumatic resistances are made mainly with nozzle-baffle, sphere-cone, and sphere-cylinder combinations; their passage cross section varies during operation. The parameters of a pneumatic resistance depend to a great extent on the nature of the gas flow (laminar or turbulent).

T. K. BERENDS

References in periodicals archive ?
Although the use of self-regulated pneumatic resistance equipment for older adults appears theoretically justified, limited research is available to empirically assess the impact of such an intervention on specific variables related to physical function in older adults.
A repeated measures controlled design was employed whereby participants were invited to take part in a 10 week intervention and allocated to either the control or pneumatic resistance based exercise group.
A waiting list of community dwelling individuals expressing interest in attending the pneumatic resistance training classes was used to recruit the intervention group, while a purposive sampling approach was taken to subsequently recruit a matched control group.
The positive findings related to lower extremity muscle function, indicate that pneumatic resistance training may be considered a suitable and effective intervention for use in this group, particularly as performance on this test has been shown to be reflective of a number of parameters related to physical function [20].
From a practical point of view, results from this study do appear to indicate that pneumatic resistance exercise is a suitable and effective intervention for use in this population; however the mode of delivery may depend on the specific requirements of the group.
In conclusion, results of this study support the use of self-regulated pneumatic resistance exercise, although further consideration may be required in relation to delivery mode.
Strength training is done with state-of-the-art computerized pneumatic resistance machines for smoother workouts and accurate monitoring.