The effect of posture on maximum grip strength measurements

Abstract Introduction/Background The purpose of this study was to compare the grip strength values obtained under four postures, and to identify the position providing the maximum grip strength value. We also explored the effects of different body positions on grip strength measurements and the significance of the selection of measurement position for guiding the screening and diagnosis of sarcopenia. Methodology A total of 764 people (409 males and 355 females) participated in this study. Grip strength was measured in four positions: (1) standing with the elbow fully extended; (2) standing with arms raised; (3) sitting with the elbow flexed 90°; and (4) sitting with the elbow extended. Multiple linear regression model was used to compare the grip strength measurements obtained from these four positions by each hand when considering the influence of age, gender, BMI (body mass index) and other factors. Results Both male and female grip strength values in the standing position with the elbow fully extended were significantly greater than those in other positions. In addition, the grip strength measured by standing posture was generally greater than measured by sitting posture. In contrast, grip strength values in the two sitting positions did not differ significantly. The grip strength of men was generally greater than that of women. Conclusions The findings reveal that grip strength measured while standing with the elbow fully extended is greater than that measured while sitting, which is the posture currently recommended in clinical practice. Clinicians and researchers should choose the appropriate and optimal postures to measure grip strength.