Abstract
BackgroundThis study aimed to determine whether sex, hand length and the individual training status affect hand strength and whether these measurements differ if they are recorded using the Jamar dynamometer or a new cylindrical measuring system.MethodsFor this purpose, 152 healthy adults were examined using a new manugraphy measuring system (novel, Munich, Germany) comprising two measuring cylinders of different sizes and a Jamar electronic dynamometer with two grip positions corresponding approximately to the sizes of the cylinders. A descriptive analysis was performed as well as a correlation analysis using the Pearson correlation coefficient. To prepare predictive models, multiple linear regression analyses were carried out to determine factors that influence the force and p ≤ 0.05 was considered statistically significant.ResultsA significant difference in the maximum and mean strength was observed that is dependent on sex, with men stronger than women, in line with expectations, and hand length, with small hands able to exert less force than large hands. No consistent increase in strength could be attributed to repetitive manual loads applied either at work or in leisure activities.ConclusionsBoth measurement techniques yielded similar results, suggesting that manugraphy is well suited for clinical research purposes because it not only takes measurements that are just as reproducible and valid as the conventional measurement technique but in doing so measures not just the total strength of a hand but also enables more precise comparisons of isolated hand regions applying dynamic measurements.
Highlights
This study aimed to determine whether sex, hand length and the individual training status affect hand strength and whether these measurements differ if they are recorded using the Jamar dynamometer or a new cylindrical measuring system
In this study we demonstrated that the manugraphy system measures just as accurately and reproducibly as a Jamar dynamometer and the correlation between the measurements recorded by both devices is high [14]
Big advantage of the manugraphy system is that the measuring device is based on the sum of forces distributed over the surface of a cylinder and allows for differentiated measurement even with low impact forces
Summary
This study aimed to determine whether sex, hand length and the individual training status affect hand strength and whether these measurements differ if they are recorded using the Jamar dynamometer or a new cylindrical measuring system. The manugraphy system (novel biomechanics laboratory, Munich, Germany) works with cylinders that are enclosed in pressure recording mats. This allows highly accurate measurement data to be recorded. Unlike the Jamar dynamometer, the manugraphy system can determine how much force is exerted by different hand regions and fingers during the gripping process [1]. This may enable the complex gripping process to be evaluated with greater precision, even for patients with functional restrictions after a hand injury or as a result of nerve damage, for example. The manugraphy system can add to the understanding of time flow and force distribution during power grip
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