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The H reflex is a delayed response, used in electromyography, which gives us information about the state of nerve fibers in their most proximal levels. In this project, the H reflex was recorded from normal subjects, their traits were studied, their physiological meaning was analyzed; latency along with the amplitude of the reflex was linked to some of the subject’s characteristics such as sex, height, weight and age. This study started by selecting a sample of 100 normal subjects between the ages of 20 and 24 and 20 subjects between the ages of 30 and 69. The height and weight was measured, and H reflex of each subject was recorded bilaterally. Next, we studied the relationship that could be established between variables found in what determines the H reflex and the subject’s parameters. Z Test was carried out in order to compare the results from different groups. The statistical difference was analyzed considering 95 % reliability. The programs Epi Info and Excel were used to calculate the correlation coefficients between the determined variables. A strong correlation was found between the latency of the H reflex with each subject’s height (r = 0.81) and age (r = 0.58). Also, an inverse correlation was found between each subject’s age and the magnitude of the H wave. No significant difference was found among the sex of the subjects, not even in the latency bilateral in the same subject. The difference between latencies based in the height is explained by the longitude of the reflex arch and differences found by age are due to neuronal loss. The coefficient of lineal regression was found to establish a formula which helps predict the latency of H reflex if the height and age of the subject are known. With this project, the H reflex results of the Panamanian population were standardized; which will be of great use in the diagnosis, prognosis and in early therapeutic decision making which will, without a doubt, decrease the enormous economic losses that labor incapacity produces because of radiculopathies.