Reliability of VALD DynaMo dynamometer to assess upper and lower body isometric strength in healthy adults

Tyler Collings; Benjamin I Goodlich; Andrea H Hams; Matthew N Bourne

doi:10.1016/j.ptsp.2025.08.005

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Reliability of VALD DynaMo dynamometer to assess upper and lower body isometric strength in healthy adults

Journal article

Open access

Peer reviewed

Reliability of VALD DynaMo dynamometer to assess upper and lower body isometric strength in healthy adults

Tyler Collings, Benjamin I Goodlich, Andrea H Hams and Matthew N Bourne

Physical Therapy in Sport, Vol.75, pp.135-143

2025

DOI: https://doi.org/10.1016/j.ptsp.2025.08.005

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Abstract

Sports medicine

Dynamometry

force platforms

grip strength

handheld

isometric mid-thigh pull

measurement properties

validity

Objectives This study aimed to evaluate the intrarater within-day and between-day absolute agreement reliability of DynaMo Max and DynaMo Plus handheld dynamometers for upper and lower body isometric strength assessments compared to existing devices. Design Repeated measures study. Setting Two laboratory sessions, seven days apart. Participants Twenty healthy, recreationally active adults (40% female; age = 29.1 ± 5.8 years). Main Outcome Measures Intraclass correlation coefficients (ICC), coefficient of variation, and Bland-Altman plots and 95% limits of agreement for fourteen isometric strength tests. Results DynaMo Max exhibited excellent between-day and within-day reliability (ICC >0.90) for 21 of 24 (88%) upper and lower body isometric strength tests. Tests using tension were more reliable than those using compression. DynaMo Plus demonstrated similar reliability to the Jamar Hydraulic device for grip strength, although limits of agreement were -7.4 to 7.7 kg. DynaMo Max measured peak IMTP force with high levels of agreement to the ForceDecks (R2=0.99, -22 to 95 N). Conclusions DynaMo Plus and Max are reliable tools for isometric strength assessments of upper and lower body muscle groups. Tension tests are recommended over manually resisted compression tests. DynaMo Max and Plus are accurate and reliable options for IMTP and grip strength testing, respectively.

Details

Title: Reliability of VALD DynaMo dynamometer to assess upper and lower body isometric strength in healthy adults
Authors: Tyler Collings (Corresponding Author) - Griffith University
Benjamin I Goodlich (Author) - University of the Sunshine Coast, Queensland, School of Health - Physiotherapy
Andrea H Hams - Griffith University
Matthew N Bourne - Griffith University
Publication details: Physical Therapy in Sport, Vol.75, pp.135-143
Publisher: Elsevier Ltd
Date published: 2025
DOI: 10.1016/j.ptsp.2025.08.005
ISSN: 1873-1600; 1466-853X
Grant note: This research was funded by VALD who provided equipment and data collection costs.
Organisation Unit: School of Health - Physiotherapy
Language: English
Record Identifier: 991154338502621
Output Type: Journal article

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