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The purpose of this investigation is to propose a method for determining resultant joint moments from a Biodex System 3 isokinetic dynamometer. Previous investigations using a dynamometers determined that measured moments from a dynamometer do not equate to the moment applied by the joint. Using Biodex System 3 dimensions and equipment, the proposed method corrects for gravity, acceleration and inertia moments, and relative angular movement between the dynamometer and the joint axis of rotation for the knee and ankle. The current method includes gravitations correction using a 3rd order polyfit method to a 4°/s passive trial, and inclusion of inertial moments from the dynamometer arm and limb segment. A method is also proposed to correct for gravitational moments, acceleration and inertia moments, and distal joint moments while testing the hip. Previously proposed methods are then compared to the proposed method in isometric and isokinetic exertions. The comparison to a known moment concluded that the results for the isometric exertion are accurate for the proposed method. If the torque measurements from the dynamometer are independent of the velocity, as reported by the manufacturer, the validation of the proposed method for isometric testing holds true for isokinetic as well. The results from isokinetic testing show reasonable results for determining the resultant joint moments. The proposed method can be simplified for clinical or experimental testing. If inertial and acceleration moments are not of concern, than using the propsed gravitational correction will account for the COM (Center of Mass). No additional measurements of the limb segement and dynamometer attachment are needed. The proposed method is recommended for Biodex System 3 isokinetic dynamometer correction in obtaining resultant joint moments at the knee, ankle, and hip. / Master of Science

The aim of my diploma thesis was engineering design of 4x4 chassis dynamometer model at 1:10 scale for presentation purpose and for testing RC cars models. The first part describes the current types of chassis dynamometers. The main goal of the thesis was designed the model itself in order to produce some parts of the dynamometer using 3D printing. The work also includes production drawings of individual parts and economic estimate of the entire production.

Call number: LD2668 .T4 1964 P29 / Master of Science

Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains vii, 56 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 48-50).

The purpose of this research was twofold: 1) Develop a controlled-release ergometer for the measurement of musculo-tendinous stiffness of the knee flexors and 2) Compare results of the measurement of musculo-tendinous stiffness obtained via controlled-release method and oscillation method. Each purpose was addressed in a separate research paper. Research paper one describes the successful modification of a Cybex NORM isokinetic ergometer for use in controlled-release experiments. The modifications include not only the ones to the Cybex, but also the design of an instrumented leg cuff and software to collect and analyze the data from the experiment. The stiffness values obtained from this technique compared favorably, when considering morphological differences, to those obtained from controlled-release experiments of the ankle joint. The main difficulty encountered in this experiment was the lack of information obtained from low end of the stiffness-moment curve. In research paper two, both techniques were successfully used to measure stiffness of the knee-flexors and no significant difference was found between the two methods, (p = 0.157). However, it was clear that each technique has its advantages and disadvantages in regard to what part of the stiffness-moment curve they are able to measure. Due to the inability of participants to perform the oscillation technique with high loads, this technique is best suited to measure stiffness of lightly loaded systems.On the other hand, the controlled-release technique provided a good representation of the high, linear end of the stiffness-moment curve, but was unable to provide good information about the toe-region of the stiffness-moment curve. / School of Physical Education

Thesis (M.S.)--Ohio University, 2002. / Title from PDF t.p.

Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains xii, 105 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 96-100).

The purpose of this study was to explore utility of handgrip strength measured by the hand-grip dynamometer for assessment of nutritional status in protein-calorie malnutrition. The first study included six subjects (all right-handed), who had grip strength measured daily for five days, then weekly for three weeks. Intra-individual variability was approximately 10%. No learning or training effect was observed. Change in leg position from feet on the floor to elevation of feet made no significant difference in grip-strength measurement. In Phase Two, 43 healthy adult subjects (three left-handed) prior to elective surgery, height was significantly related to handgrip strength (r = 0.82, p < 0.001). Males were stronger than females. After surgery, the non-dominant hand lost significant strength (2.68 kilograms) and recovered more quickly than the dominant hand. Multiple regression analyses provided predictive equations for pre-surgery left hand-grip strength using age, sex, and height (R² = 0.77); from age, sex, hand measured, and grip strength two days after surgery or three days after surgery (R² = 0.89 for each). Ten sequential grip-strength measurements analyzed by repeated measures analysis of variance with orthogonal comparisons showed a difference in measurements between hands as well as before and after surgery. The slope of the measurement line was more linear before and three days after surgery, but more quadratic in shape two days after surgery. The effects seen by type of surgery were inversion of the slope of right hand sequential measurements two days after knee surgery and before-surgery drop and increase from trial five to trial seven in left hand sequential measurements of knee and vaginal hysterectomy subjects. In a six-month-long case study, grip-strength measurements were followed in a seriously-ill 68-year-old patient hospitalized for surgical repair of hiatal hernia and mucous fistula who underwent several periods of nutritional depletion. Grip strength varied throughout the period (although not differently from healthy subjects), but did not directly parallel changes in serum albumin or prealbumin. The conclusion was that hand strength measured by the handgrip dynamometer did not change enough with fasting and surgery from normal day-to-day variability to be useful for nutritional assessment.

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