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Biomedical subjects

V A Korzhen'iants

Publications and source records attributed to V A Korzhen'iants.

12 recordsLinked to original sources
PubMed1996

[Effects of preliminary loading on dynamic strength of the spine].

The purpose of this work was to evaluate early and delayed effects of static mechanical loading of the spine on human tolerance to the ejection g-loads. Experiments with spine segments showed that static pre-loading equivalent to aerobatic accelerations of 8-10 units leads to relative strengthening of vertebra with low tolerance of the longitudinal shock load. Effect of aerobatic accelerations of 5, 6, 7, and 8 units on ejection g-load tolerance was theoretically evaluated.

Acceleration↗
PubMedDate not supplied

[Human tolerance of the "side-to-side" impact loads].

Three groups of criteria can be used to describe ultimate tolerance of the "side-to-side" impact loads by test-subject as a pre-shock or pre-traumatic margin of relatively safe exposure. These groups include subjective signs, regulatory (bradycardia, extrasystole, brief respiratory disturbances) and spinal biomechanics deviations. Physiological experiments with 12 essentially healthy young male volunteers showed that ultimate tolerance of 0.13- to 0.16-second exposure to lateral impact loads varied within the range from 15 to 30 units as a result of body motion restraint with shoulder and hip belts and was 1.8-fold lower with the waste belt only.

Adolescent↗
PubMedDate not supplied

[Change in the properties of the femoral bones of rats due to exarticulation of the crus and hypokinesia].

Rat experiments demonstrated that unilateral calf exarticulation leading to the loss of the leg weight-bearing function resulted in a decrease of the density, ash content and mineral content in the femoral diaphysis. This manipulation reduced the mechanical strength and did not change the elastic properties of the bone. Histological examinations showed osteoporosis in the cortical plate. Partial maintenance of the weight-bearing function in the animals with bilateral exarticulation of the calf prevented these changes. The results suggest that special steps taken to provide static load on leg may be effective countermeasures against atropic changes in bones devoid of their weight-bearing function.

Amputation, Surgical↗