DATASET - Validity and reliability of the DynaMo PLUS dynamometer
Description
Dataset used to assess the concurrent validity of the DynaMo PLUS versus isokinetic dynamometry, and to determine its intra- and inter-rater reliability in healthy young adults.
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Steps to reproduce
Data Collection DynaMo PLUS — Testing Positions All measurements were performed using the "make test" technique, where the participant exerts maximal isometric force against the dynamometer, which is held stationary by the evaluator. This technique was selected due to its superior inter-tester reproducibility compared to the "break test" for Handheld Dynamometry (HHD) assessments (Stark et al., 2011). Isometric strength for the target lower limb muscle groups was assessed following manufacturer guidelines and established protocols (Lipovšek et al., 2022). To ensure accurate torque calculations (N·m), the lever arm was systematically measured as the distance between the anatomical joint axis and the point of force application on the device. Knee: Knee flexors were tested in a prone position with the knee flexed to 90°. The dynamometer was placed on the posterior surface of the lower leg, 6 cm proximal to the lateral malleolus. For knee extensors, participants sat at the edge of the table with the knee flexed to 90° and arms crossed over the chest. The dynamometer was placed on the anterior aspect of the lower leg, 6 cm proximal to the lateral malleolus, with a stabilization strap secured around the table. Ankle: Ankle dorsiflexors were assessed in a supine position with legs extended and heels resting on the table. The dynamometer was placed on the dorsal surface of the foot, between the cuneiforms and the metatarsal heads. Ankle plantar flexors were assessed in a seated position with the knee at 90°. While this position ensures consistency with manufacturer guidelines, it is noted to limit gastrocnemius contribution due to muscle shortening at this joint angle (see Discussion). Humac Norm — Testing Positions Isokinetic evaluations were conducted using the Humac Norm isokinetic dynamometer. Standardized testing positions were strictly maintained according to manufacturer guidelines to ensure reliability and optimal participant stabilization (Computer Sports Medicine Inc., 2024). Knee: Participants were seated with hips and knees flexed at 90°. To prevent compensatory movements, the trunk was stabilized with a thoracic strap, and participants grasped the side handles. The dynamometer axis was aligned with the lateral femoral condyle, with the lever arm secured just proximal to the ankle. Both muscle groups were evaluated using three 5-second maximal voluntary contractions, separated by 2-minute rest intervals. Ankle: Participants were seated with hips and knees at 90° and the foot in neutral alignment. The foot was secured to the device footplate with straps to prevent heel lift or tibial movement. The dynamometer axis was aligned with the lateral malleolus, isolating the tibialis anterior for dorsiflexion and the gastrocnemius-soleus complex for plantar flexion.
Institutions
- Centro de Investigação Interdisciplinar Egas MonizSetúbal, Caparica