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Vol. 83, Issue 6, 2131-2138, December 1997
Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada L8S 4K1
Received 10 February 1997; accepted in final form 18 August 1997.
O'Leary, Deborah D., Karen Hope, and Digby G. Sale.
Posttetanic potentiation of human dorsiflexors.
J. Appl. Physiol. 83(6):
2131-2138, 1997.
Twitch contractions of the ankle dorsiflexors were evoked before and after applied 7-s tetanic stimulation at 100 Hz
in 20 young adults. Torque decreased 15% during the tetanus. At 5 s
after tetanus, twitch peak torque had potentiated 45%. Potentiation
declined to 28% after 1 min, rose slightly to 33% at 2 min, and
declined slowly with potentiation still 25% after 5 min. There was
large intersubject variation in the amount of potentiation
(5-140%) and its persistence (5 to 
20 min). The muscle compound
action potential (M wave) did not change significantly (from pretetanic
value) at 5 s after tetanus but increased sharply (26%) at 2 min and
then subsided. Twitch half relaxation time (23%) decreased
significantly more than twitch rise time (13%) 5 s after tetanus and
recovered more slowly. Twitch rates of torque development (75%) and
relaxation (71%) increased similarly 5 s after tetanus and were still
elevated (~25%) at 5 min. The extent of twitch torque potentiation
was significantly inversely correlated with pretetanic twitch rise time
(r = 
0.69), half relaxation time (r = 0.61), and
twitch-to-tetanus ratio (r = 0.66). The data indicate that posttetanic potentiation has a
greater effect on twitch half relaxation time than on time to peak
torque and is more prominent in muscles with a short twitch time course
and small twitch-to-tetanus ratio.
action potential; contraction; contraction time; twitch
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