Volunteer experience with Project Concern in Tijuana.
Explore the source record for details and available documents.
Dental Hygienists↗
Biomedical subjects
J L Stephens
Publications and source records attributed to J L Stephens.
The reliability and validity of the Tekdyne hand dynamometer: Part I.
The purpose of this study was to evaluate the reliability of Tekdyne hand dynamometer in a controlled loading environment using the Instron 1331. Test-retest reliability, the intertool reliability of three different Tekdyne hand dynamometers, and the effects of surface area and the configuration of the forces applied to the Tekdyne hand dynamometer were studied. In addition, intertool reliability between a Jamar dynamometer modified with foam padding and the same Jamar dynamometer without padding was calculated to explore this device as an alternative measurement device. Intratool and intertool reliabilities of the three Tekdyne tools were high (ICC = 0.993-10.998, SEM = 0.106-0.045 psi and ICC = 0.995, SEM = 0.080 psi, respectively) when tested on the Instron. Both the surface area and the configuration of the force applied to the Tekdyne dynamometer appeared to influence the output reading of this device. The measurements obtained on the Tekdyne hand dynamometer correlated well with those obtained with the Jamar hand dynamometer when a controlled load was applied (r = 0.988). The Tekdyne hand dynamometer is a reliable tool in a controlled loading environment; however, further study is needed to determine its validity with respect to the Jamar dynamometer for testing human grip strength.
Equipment Design↗
The reliability and validity of the Tekdyne hand dynamometer: Part II.
The purpose of this study was to evaluate the reliability and validity of the Tekdyne hand dynamometer for measuring grip strength as compared with the Jamar dynamometer. Additionally, it was hypothesized that one to six weeks after carpal tunnel release (CTR) grip strength would appear to be greater when tested on a softer tool than when tested on the Jamar dynamometer. The Tekdyne, the standard Jamar instrument (SJ) and a Jamar dynamometer modified with foam padding (MJ) were compared in 48 subjects without upper-extremity abnormality and 30 subjects following open-palm CTR. The Tekdyne and the Jamar hand dynamometers were well correlated in the presence and in the absence of upper-extremity abnormality (r = 0.975 and r = 0.871, respectively). Tekdyne intrasession reliabilities in both the non-surgical group and the surgical group were high (ICC = 0.954, SEM = 0.290 psi and ICC = 0.958, SEM = 0.219 psi). The Tekdyne intersession reliability of the non-surgical group was high (ICC = 0.971, SEM = 0.22 psi). There was no statistically significant difference between the ratios of the non-operated grip strengths across the three measurement devices, suggesting that the softer device did not promote greater force production by the operated hand.
Adult↗