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01-07-2008 | Original Article

Postactivation potentiation of short tetanic contractions is differently influenced by stimulation frequency in young and elderly adults

Authors: Stéphane Baudry, Malgorzata Klass, Jacques Duchateau

Published in: European Journal of Applied Physiology | Issue 4/2008

Abstract

The purpose of this study was to examine the effects of postactivation potentiation (PAP) on the torque and rate of torque development for contractions evoked by short trains of stimuli at different frequencies, in young and elderly adults. Individual mechanical contributions to each electrical stimulus within trains were also analysed. Single pulse, and two- (PT₂) and three-pulse trains (PT₃) delivered at 20, 50, 80 and 100 Hz were evoked before and during a 10 min period after a 6-s conditioning MVC. The results show that PAP of the torque for PT₂ decreased with the increase of the stimulation frequency for young (from 184.5 to 140.4% of control values) and elderly (from 140.5 to 109.6%). Regardless of the stimulation frequency, the peak of PAP was greater in young than in elderly and occurred immediately after the conditioning MVC but was delayed for the 100 Hz condition in elderly adults. For PT₃, the results were similar although the extent of PAP was less. The PAP of the mechanical contributions within the trains also decreased with the augmentation of the stimulation frequency. For most of the frequencies above 20 Hz, the peak of PAP for each mechanical contribution was delayed by 1 min after the conditioning MVC. These results indicate an age- and frequency-related PAP saturation of the successive mechanical contributions within a train of stimuli that decrease with time. The functional implication of the findings is that PAP effect is lower and delayed at high compared with low activation rate.

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Title: Postactivation potentiation of short tetanic contractions is differently influenced by stimulation frequency in young and elderly adults
Authors: Stéphane Baudry
Malgorzata Klass
Jacques Duchateau
Publication date: 01-07-2008
Publisher: Springer-Verlag
Published in: European Journal of Applied Physiology / Issue 4/2008
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-008-0739-1

At a glance: The STEP trials

Springer Medicine

Postactivation potentiation of short tetanic contractions is differently influenced by stimulation frequency in young and elderly adults

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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