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Fig. 2. Typical recordings of twitch and tetanic forces developed by direct or
indirect stimulation at three different temperatures, 4°C, 12°C and
22°C. Twitch and tetanic forces at the different temperatures were
recorded from the same preparations. The duration of the stimulation in
tetanus was 1 s. Forces obtained by indirect stimulation (thick lines) are
expressed relative values to those obtained by direct stimulation (thin lines)
at each temperature. Temperatures and stimulation frequencies in tetanus are
denoted for each recording.
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