Isokinetic System Research Articles

Isokinetics in the assessment of rehabilitation: a case report

The purpose of this study was to quantify the rehabilitation of an English First Division soccer player by using the Cybex II Isokinetic system. The subject had received extensive injuries to the right knee during play. Isokinetic measurement permitted the objective assessment of the initial injury and the subsequent quantification of the effectiveness of the rehabilitation programme. The subject was required to repeat the same test protocol on three occasions 12, 20, and 27 weeks post-operatively. At the initial assessment bilateral comparative data provided the physiotherapist with objective rehabilitation targets based on the subject's own muscle function profile. Comparative data was also made available by testing an uninjured ‘control’ subject. In addition to conventional physiotherapeutic techniques, two different isokinetic devices were used in the subject's daily rehabilitative regime. On the final assessment, 27 weeks post-operatively, the subject showed a 344% increase in the peak torque of the quadriceps, and a 302% increase in the peak torque of the hamstrings. Range of movement increased from 40° to 106° and the bilateral deficit was reduced from 70% to 26% in the quadriceps, and from 52% to 16% in the hamstrings.

High Precision 85Kr Monitor

The development of a 85Kr off-gas monitor for nuclear fuel reprocessing plants is presented. Discussed are the parameters used in the design of the monitor, including the sensitivity, the dynamic measurement range, and the radionuclide composition of the off-gas stream. Detailed are the associated isokinetic sampling system, the components of the monitor, and the data acquisition microprocessor. Lastly, 85Kr rel eases measured during in-plant demonstration of the monitor are compared with known 85Kr releases.

Modifications for Enhanced Data Collection and Analysis With the Cybex Isokinetic Dynamometer.

In brief: Two modifications of the standard Cybex II isokinetic dynamometry system permit a more complete evaluation of muscular strength, endurance, and power output, while minimizing manual data analysis. The addition of an X-Y plotter to the Cybex system provides a graphic display that combines torque and joint position on a single graph. Strength data need not be limited to "peak torque" values, because the plotter permits muscular torque output to be analyzed bilaterally through the full range of motion without the need for manually transposing data from strip-chart records. The second modification is a dual-channel reciprocal work integration system that separately measures the muscular work output performed in each rotational direction of joint movement. This allows individual assessments of endurance or power output for each muscle group of a reciprocal pair in a bout of continuous reciprocal exercise.

Radiation Monitoring of Nuclear Power Station Stack Effluents

The key to satisfying Nuclear Regulatory Commission requirements for measuring airborne radioactivity escaping from nuclear power stations is to obtain representative samples. The impact of the problem of representative sampling was evaluated by means of a state-of-the-art survey, which is summarized in this paper. Data obtained from this study showed that there is now a pronounced trend toward the use of flow processing and sampling nozzle arrays rather than reliance upon turbulent mixing and the use of discrete sampling nozzles. An error analysis shows that the chief source of error is an inadequate number of sampling nozzles when nonuniform mixing occurs. Using the Limerick power station stack monitoring system as a model, a design description is given of an isokinetic sampling system using flow processing and sampling nozzle arrays. Potentials for improvement of this system are then discussed.

Microorganisms of the Upper Atmosphere

An aircraft-mounted air-sampling system for the collection of microorganisms from the upper air is described. The system is highly suitable for use in upper air sampling from an aircraft because (i) it is an isokinetic system, (ii) it is simple to operate, (iii) it employs a dry filter, (iv) the volume sampled can be easily determined, and (v) it operates efficiently at all altitudes and ambient temperatures.

Microorganisms of the Upper Atmosphere

An aircraft-mounted air-sampling system for the collection of microorganisms from the upper air is described. The system is highly suitable for use in upper air sampling from an aircraft because (i) it is an isokinetic system, (ii) it is simple to operate, (iii) it employs a dry filter, (iv) the volume sampled can be easily determined, and (v) it operates efficiently at all altitudes and ambient temperatures.