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Comparison of the results between protocol 3 (5-2-5-100 µs) and protocol 4 (5-100-5-2 µs) for the muscle response (upper graph) and pain index (lower graph). Each bar represents one pulse protocol (Tp-d1-Tp-d2) for the stated amplitude on the x-axis. The results are shown as the mean value (bar’s height) ± standard error (black vertical bars). The asterisks (*) show statistically significant differences between the pulse protocols at the stated amplitude (p < 0.05).
