This study investigated how baseball players generate large angular velocity at each joint by coordinating the joint torque and velocity-dependent torque during overarm throwing. Using a four-segment model (i.e., trunk, upper arm, forearm, and hand) that has 13 degrees of freedom, we conducted the induced acceleration analysis to determine the accelerations induced by these torques by multiplyi...

Interindividual variability in performance of fast movements is commonly explained by a difference in maximal muscle-shortening velocity due to differences in the proportion of fast-twitch fibers. To provide a better understanding of the capacity to generate fast motion, this study aimed to 1) measure for the first time in vivo the maximal fascicle-shortening velocity of human muscle; 2) evalua...

BACKGROUND To analyse the effect of real-time kinematic feedback (KRTF) when learning two ankle joint mobilisation techniques comparing the results with the traditional teaching method. METHODS Double-blind randomized trial. SETTINGS Faculty of Health Sciences. PARTICIPANTS undergraduate students with no experience in manual therapy. Each student practised intensely for 90 min (45 min for...

It is demonstrated using conventional uid theory that angular momentum can be injected into a single component plasma con ned in a Penning-Malmberg trap via an externally generated, oscillating, non-axisymmetric, electric eld. The torque exerted on the plasma by the electric eld is a highly non-monotonic function of the plasma angular rotation velocity. The torque vs. angular velocity curve is ...

A Massive Compact Halo Object (Macho) that lenses a background star will magnify different parts of the rotating stellar disk by varying amounts. The differential magnification will cause a shift in the centroid of the star’s spectral lines during the lensing event. The shift is proportional to the ratio of the stellar radius to the projected separation of the Macho from the star. It therefore ...

Soft neurological signs (SNS) are evident in the motor performance of children and disappear as the child grows up. Therefore SNS are used as criteria for evaluating age-appropriate development of neurological function. The aim of this study was to quantify SNS during arm movement in childhood. In this study, we focused on pronation and supination, which are arm movements included in the SNS ex...

This article provides reasoning and research of spatial mechanisms. The creation the first simple Bennett mechanism obtained through pyramid its base sides is described. In pyramid, angles inclination heights are determined to obtain standard equalities. Thanks all parameters, theoretical link lengths that have practical values determined. All parameters length presented on structural diagram f...

We present self-consistent numerical simulations of the sun’s convection zone and radiative interior using a two-dimensional model of its equatorial plane. The background reference state is a one-dimensional solar structure model. Turbulent convection in the outer convection zone continually excites gravity waves which propagate throughout the stable radiative interior and deposit their angular...