Grip strength in healthy Israeli adults: Comparison to internationally reported normative data

Abstract

BACKGROUND: Grip strength is frequently used in research and clinical work and is commonly compared to normative data in clinical settings. To enable accurate interpretation of grip strength values, normative reference values should be close to the demographic, occupational, cultural and geographic characteristics of the individual tested. OBJECTIVE: Investigate the effects of gender, age, work-group and hand dominance on grip strength for the Israeli population, and to compare the grip strength to two normative studies from the United States. METHODS: A cross sectional study. The grip strength of 637 healthy adults was measured using a Jamar dynamometer. The effects for age, gender, hand dominance, and work strain were investigated. Israeli sample results were compared to US norms. RESULTS: Within the Israeli sample, a significant age effect was found for both men and women. This effect was most apparent among the 70+ age groups, in which grip strength was weaker than all the other groups. Males were significantly stronger than females, in both hands, and the dominant hand was significantly stronger, regardless of gender. Results also demonstrated a medium to large effect for type of work on grip strength portraying high manual strain workers to have stronger grip strength. Overall, the grip strength in the Israeli sample was weaker than both US samples. CONCLUSION: Clinicians should be cautious when comparing grip strength to published norms from a different culture/geographical region. The amount of manual strain invested in various occupational roles should be considered in the assessment and intervention process.