A possible anatomical and biomechanical explanation of the 10% rule used in the clinical assessment of prehensile hand movements and handed dominance.

Unlabelled: A current doctrine in the dynamometric approach to determine lateralization of hand function states that in 10% of cases, the non-dominant hand will be stronger than the dominant hand. In this study, a novel MRI based modelling approach was applied to the first dorsal introsseus muscle (FDI), to determine whether the 10% rule may be applied to the FDI and may be partially explained by the arrangement of the anatomical components of the FDI.

Methods: Initially the force generated by the thumb segment during an isometric pushing task in the horizontal plane was measured from 25 strongly right-handed young males.

[Asymmetry of the viscoelastic properties of the skin and muscle compartments of the left and right hands].

The aim of this research was to discriminate and categorize isolateral stress-strain characteristics contained within the musculocutaneous compartment (MCC) using the model of the first dorsal interosseous muscle (FDI) in vivo. In our approach, the musculocutaneous compartment of the dorsal interosseous muscle was progressively isokinetically compressed by a solid vertical bar with a 0.25 mm incremental step.

[Effect of estrogens on the coronary circulation, cardiac contractile function, and development of reperfusion arrhythmia].

17-beta-estradiolsulfate (17-ES) was shown to exert a distinct vasoconstrictory effect on coronary vessels resulting in a decrease of the force contraction as well indexes of contractility. The distinct antiarrhythmic effect suggests that 17-ES possesses some properties of calcium antagonist.