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OBJETIVO: Identificar a variação de percepção sensorial e resposta motora nas diferentes fases do ciclo menstrual (CM). MÉTODO: 30 mulheres com idade entre 18 e 40 anos (23,7 ± 3,60), com índice de massa corporal entre 18,5 e 25kg/m² (21,15 ± 2,32) e CM entre 21-35 dias participaram do estudo. Utilizou-se um gerador de pulso com correntes elétricas pulsadas, freqüência de 50Hz e fases variando em 20 (B20), 50 (B50), 100 (B100), 300 (B300), 500 (B500), 1000 (B1000) e 3000µs (B3000). O limiar de percepção sensorial (LPS) foi identificado como a primeira sensação de corrente ao aumento da intensidade e o limiar de resposta motora (LRM) como a mínima contração muscular detectada. Realizaram-se cinco coletas, sendo uma em cada fase: fase 1- menstrual (F1), fase 2- proliferativa (F2), fase 3- ovulatória (F3), fase 4- lútea (F4) e fase 5- pré-menstrual (F5). A análise dos dados constou do teste de Friedman seguido do teste de Rank, realizados no programa Bioestat 4.0®, com nível de significância de 5%. Resultados: O LPS foi menor na F5 quando comparado às demais fases menstruais, para as correntes B20, B300, B500, B1000, B3000. Para o LRM houve diferença nas correntes B20, B50, B500 e B1000 entre todas as fases com a F5; na corrente B100, entre a F1 e F5; e nas correntes B300 e B3000 entre F1, F2 e F3 com a F5. CONCLUSÕES: O limiar de percepção sensorial e a resposta motora variaram sistematicamente através das fases do CM, influenciando o comportamento sensório-motor. OBJECTIVE: To identify the variation of sensory perception and motor response in the different phases of the menstrual cycle. METHOD: Thirty women aged 18 to 40 years old (23.7 ± 3.60), with body mass index between 18.5 and 25kg/m² (21.15 ± 2.32) and menstrual cycle of 21-35 days, participated in this study. A pulse generator was used, with pulsed electric current frequency of 50Hz and variable phases of 20 (L20), 50 (L50), 100 (L100), 300 (L300), 500 (L500), 1000 (L1000) and 3000µs (L3000). The threshold of sensory perception (TSP) was identified as the first sensation of increased current intensity and the threshold of motor response (TMR) as the minimum muscle contraction detected. Five collections were done, at each of the following phases: phase 1- menstrual (P1), phase 2- follicular (P2), phase 3- ovulatory (P3), phase 4- luteal (P4) and phase 5- premenstrual (P5). The data analysis consisted of the Friedman test followed by the Rank test, carried out in the BioStat 4.0® software, with a significance level of 5%. RESULTS: The TSP was lower in P5 than in the other menstrual phases, for the L20, L300, L500, L1000 and L3000 currents. For the TMR, there was difference in the L20, L50, L500 and L1000 currents between P5 and all other phases; in the L100 current, between P1 and P5; and in the L300 and L3000 currents for P1, P2 and P3 versus P5. CONCLUSIONS: The thresholds of sensory perception and motor response varied systematically through the phases of the menstrual cycle, thus influencing motor-sensory behavior

Determinação dos limiares de percepção sensorial e de resposta motora nas diferentes fases do ciclo menstrual