[Changes in neuromuscular conduction of workers depending on age].

Background: The research was conducted to determine the effect of age on potential functional changes occurring through the transmission of nerve impulses in the motor nerves supplying selected muscles of the lower limb. The nerve conduction parameters in the lower limb were measured, as well as the ability to control muscle tension with pressure on the foot pedal.

Material and methods: The study included a group of 54 men, differentiated by age. During the research, the speed of nerve conduction, amplitude and latency of the motor response in the tibial and peroneal nerves were measured. During the RAMP-contraction test, the EMG signal was recorded from the tibialis anterior muscles and the gastrocnemius muscles of the medial head.

Results: The results of the research showed that with age the ability to control muscle tone decreases, the speed of transmission of electrical impulses decreases, the motor response is delayed and its amplitude is significantly lower than in the case of younger people.

Conclusions: The deterioration of neuromuscular conduction observed with age and a reduction in the ability to control the generated value of muscle strength may result in a deterioration of the ability to operate equipment or drive vehicles. From the point of view of prolonging the activity in working life, identifying all factors limiting the functioning of an older employee in the work environment may be the basis for creating guidelines and recommendations helpful in the design of devices and workstations for older employees. Med Pr. 2022;73(5):417-25.