ДИНАМІКА ЗМІН ТОНЗОМЕТРИЧНИХ ПОКАЗНИКІВ КІНЦІВОК ЩУРІВ ПІСЛЯ ДІЇ УДАРНО-ХВИЛЬОВОГО ВПЛИВУ

Abstract Blast injuries often lead to complex injuries that can affect the functioning of the neuromuscular complex, including both the spinal cord and peripheral nerves. Understanding these reactions allows medical professionals to better assess the extent of the damage and determine treatment tactics. The study of the reactions of the neuromuscular complex helps to identify the mechanisms of the body’s adaptation to injury. This may include neuroplasticity, regeneration and recovery processes, which are critically important for the rehabilitation of patients. Therefore, the study of the reactions of the neuromuscular complex in blast injury of the spinal cord is critically important for improving treatment, rehabilitation and overall understanding of the mechanisms behind these complex injuries. Purpose of the work. To determine the forces of voluntary muscle efforts under conditions of blast injury. The work used strain gauge methods that allowed us to quantitatively assess the force of contractions of the extensor muscles of the hind limbs and flexors of the forelimbs of rats under shock wave exposure. Results and their discussion. it was found that with gradual loading on the first day, a decrease of 10.77 % was observed, on the seventh day – 16.92 %, and on the fourteenth day, a recovery of 3.08 %. The jerk force on the first day increased by 7.89 %, on the seventh day – a decrease of 2.63 %, on the fourteenth day – a recovery of 1.32 %. When calculating the relative force on the first day, a decrease of 10.77 %, on the seventh day – 16.93 %, on the fourteenth day – a recovery of 3.04 %. The jerk force on the first day increased by 7.9 %, on the seventh day – decreased by 2.63 %, on the fourteenth day – recovered by 1.33 %. Therefore, in conditions of injury, the jerk force may be temporarily higher due to the activation of the body’s protective mechanisms. This may be useful in some situations, but it is important to consider that such activation may lead to further damage to the muscles or tissues. The increase in muscle strength in jerks on the first day after spinal cord injury may be associated with several factors. First, the injury may activate residual neurons, which leads to spontaneous activity and temporary recovery of some functions. Second, reflexes may recover even if the upper nerve pathways have been damaged.