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Biomedical subjects

J Babic

Publications and source records attributed to J Babic.

11 recordsLinked to original sources
PubMed2001

Stability analysis of four-point walking.

The aim of the experiment reported here was to determine the static and dynamic stability of two-point stance phases when walking on hands and knees at different speeds. In addition, we defined the methods and predicted the consequences of including two-point stance phases into crutch assisted functional electrical stimulation (FES) walking. Crawling on hands and knees was performed at three speeds by five healthy male persons. With twelve joint-position markers placed on the subject, we determined two stability indices for every instant of gait. We analysed the peak values of these two indices during the two-point stance phases. The results indicate that we have to ensure the proper position of the centre of gravity to increase the speed of walking. To reach speeds, lower than 0.6 m/s, it is not necessary to include statically unstable phases. The shift of the centre of gravity towards and across the leading stability edge can result in getting into the dynamically unstable state. Considering the results we can effectively introduce two-point stance phases into crutch assisted FES walking and therefore increase the speed and energy effectiveness of walking

Biomechanical Phenomena↗
PubMed1976

Reduction of incidence and mortality of respiratory distress syndrome by adminstration of hydrocortisone to mother.

Hydrocortisone (100 mg in a single injection) was given to 120 pregnant women with threatened premature delivery. None was given to a control group of 40 mothers. Orciprenaline was also given to all the mothers to inhibit uterine activity. The administration of hydrocortisone did not accelerate delivery and in the treated group 55 babies were eventually born at term; none died or had perinatal complications. 65 babies were born prematurely, and yielded these conclusions; if the mother received hydrocortisone less than 24 hours before delivery it had little or no influence on the incidence of and mortality from the respiratory distress syndrome (RDS). If birth occurred more than 24 hours after hydrocortisone injection, the incidence and mortality from RDS were lowered. Prolonged rupture of membranes had no effect on the mortality rate from RDS. It was concluded that hydrocortisone administered to mothers with threatened delivery is an effective means of mitigating the incidence and severity of RDS in infants.

Acid-Base Equilibrium↗