Study Design: Descriptive normative. Introduction: Intrinsic hand strength can be impacted by hand arthritis, peripheral nerve injuries, and spinal cord injuries. Grip dynamometry does not isolate intrinsic strength, and manual muscle testing is not sensitive to change in grades 4 and 5. The Rotterdam Intrinsic Hand Myometer is a reliable and valid test of intrinsic hand strength; however, no adult normative data are available. Purpose of the Study: To describe age- and gender-stratified intrinsic hand strength norms in subjects aged 21 years and above and to determine if factors known to predict grip dynamometry also predict measures of intrinsic hand strength. Methods: Three trials of 5 measures of maximal isometric intrinsic strength were performed bilaterally by 607 “healthy-handed” adult males and females. Average strength values were stratified by age and gender. Data were analyzed to determine the influence of demographic and anthropometric variables on intrinsic strength. Results: Intrinsic strength generally followed age and gender trends similar to grip dynamometry. Age, gender, body mass index, and the interaction between gender and body mass index were predictors of intrinsic strength, whereas in most cases, the hand being tested did not predict the intrinsic strength. Discussion: With the addition of these findings, age- and gender-stratified hand intrinsic strength norms now span from age 4 through late adulthood. Many factors known to predict grip dynamometry also predict intrinsic myometry. Additional research is needed to evaluate the impact of vocational and avocational demands on intrinsic strength. Conclusions: These norms can be referenced to evaluate and plan hand therapy and surgical interventions for intrinsic weakness.
Bibliographical noteFunding Information:
Funding: This project was supported, in part, by grant 1UL1RR033183 from the National Center for Research Resources, United States and by grant 8UL1TR000114-02 from the National Center for Advancing Translational Sciences, United States of the National Institutes of Health, United States to the University of Minnesota Clinical and Translational Science Institute (CTSI), United States. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the CTSI or the National Institutes of Health. The University of Minnesota CTSI is part of a National Clinical and Translational Science Award (CTSA) consortium created to accelerate laboratory discoveries into treatments for patients.
© 2019 Hanley & Belfus
- Reference values
- Rotterdam intrinsic hand myometer
PubMed: MeSH publication types
- Journal Article