Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine · 2025
Reliability of VALD DynaMo dynamometer to assess upper and lower body isometric strength in healthy adults.
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Collings Tyler J, Goodlich Benjamin I, Hams Andrea H, Bourne Matthew N
Аннотация
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.
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.