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Muscle force during stimulations of esophagus muscle strips at biphasic pulse protocols with different interphase delays (d1) and interpulse delays (d2). Both protocols had the same number of pulses (100) and pulse width (5 µs). Each bar represents one pulse protocol (blue—protocol 3′, orange—protocol 4′). The results are shown as the mean value of three repetitions (bar’s height) ± standard deviation (black vertical bars).
