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Departments of Kinesiology and Medicine, McMaster University, Hamilton, Ontario, Canada L8S 4K1
In small mammals, muscles with shorter
twitch contraction times and a predominance of fast-twitch, type II
fibers exhibit greater posttetanic twitch force potentiation than
muscles with longer twitch contraction times and a predominance of
slow-twitch, type I fibers. In humans, the correlation between
potentiation and fiber-type distribution has not been found
consistently. In the present study, postactivation potentiation (PAP)
was induced in the knee extensors of 20 young men by a 10-s maximum
voluntary isometric contraction (MVC). Maximal twitch contractions of
the knee extensors were evoked before and after the MVC. A negative correlation (r = 
0.73, P < 0.001) was found
between PAP and pre-MVC twitch time to peak torque (TPT). The four men
with the highest (HPAP, 104 ± 11%) and lowest (LPAP, 43 ± 7%) PAP
values (P < 0.0001) underwent needle biopsies of vastus
lateralis. HPAP had a greater percentage of type II fibers (72 ± 9 vs. 39 ± 7%, P < 0.001) and shorter pre-MVC twitch TPT (61 ± 12 vs. 86 ± 7 ms, P < 0.05) than LPAP. These data
indicate that, similar to the muscles of small mammals, human muscles
with shorter twitch contraction times and a higher percentage of type
II fibers exhibit greater PAP.
action potential; contractile properties; motor unit activation
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