Neural contribution to postactivation potentiation

The current study was designed to investigate the contribution of neural factors to postactivation potentiation (PAP). Neuromuscular function (i.e. twitches, H-reflexes, motor evoked potentials, and voluntary isometric ballistic contractions) of 8 power-trained (POW) and 8 endurance-trained (END) at...

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Main Author: Ruggiero, Luca
Other Authors: Liikuntatieteellinen tiedekunta, Faculty of Sport and Health Sciences, Liikuntabiologian laitos, Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2015
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/46013
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author Ruggiero, Luca
author2 Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto
author_facet Ruggiero, Luca Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto Ruggiero, Luca Liikuntatieteellinen tiedekunta Faculty of Sport and Health Sciences Liikuntabiologian laitos Department of Biology of Physical Activity University of Jyväskylä Jyväskylän yliopisto
author_sort Ruggiero, Luca
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description The current study was designed to investigate the contribution of neural factors to postactivation potentiation (PAP). Neuromuscular function (i.e. twitches, H-reflexes, motor evoked potentials, and voluntary isometric ballistic contractions) of 8 power-trained (POW) and 8 endurance-trained (END) athletes was recorded before and after a 8-second maximal isometric conditioning contraction (CC) to induce PAP, to elucidate discriminating neural factors in exploiting PAP that might arise from the former training background compared to the latter. After CC, twitch peak force and rate of force development were significantly increased, with higher potentiation in POW (29 ± 11% and 64 ± 24%) than END (8 ± 12% and 34 ± 20%). Among evoked potentials, only motor evoked potentials were short-term facilitated (127 ± 111% and 93 ± 89%, for END and POW respectively), similarly between groups. No differences were reported in ballistic performance (P ≥ 0.069), whose neural drive was significantly depressed in POW at 1 and 2 minutes post-CC, respectively compared to END and to baseline (19 ± 11%). PAP was characterized from enhanced muscle contractile characteristics as well as short-term facilitation of corticospinal excitability, whose individual contribution to performance enhancement could not be quantified. However, when POW were compared to END, the former group benefited from PAP in triceps surae muscles only in terms of higher potentiation of muscular contractile characteristics, as neural pathways were affected likewise from CC. In addition, neural drive of ballistic performance, if affected, might be depressed in POW rather than enhanced, presumably due to neural fatigue from CC. Differences between groups in exploiting PAP in ballistic actions might be therefore primarily related to muscular potentiating mechanisms, although only non-significant potentiation (p-value close to the significance threshold) was found in ballistic performance in our experiments.
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Neuromuscular function (i.e. twitches, H-reflexes, motor evoked potentials, and voluntary isometric ballistic contractions) of 8 power-trained (POW) and 8 endurance-trained (END) athletes was recorded before and after a 8-second maximal isometric conditioning contraction (CC) to induce PAP, to elucidate discriminating neural factors in exploiting PAP that might arise from the former training background compared to the latter.\r\nAfter CC, twitch peak force and rate of force development were significantly increased, with higher potentiation in POW (29 \u00b1 11% and 64 \u00b1 24%) than END (8 \u00b1 12% and 34 \u00b1 20%). Among evoked potentials, only motor evoked potentials were short-term facilitated (127 \u00b1 111% and 93 \u00b1 89%, for END and POW respectively), similarly between groups. 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spellingShingle Ruggiero, Luca Neural contribution to postactivation potentiation Postactivation potentiation supramaximal twitches corticospinal excitability ballistic performance neural drive. Biomekaniikka Biomechanics 5012 hermosto aivokuori suorituskyky
title Neural contribution to postactivation potentiation
title_full Neural contribution to postactivation potentiation
title_fullStr Neural contribution to postactivation potentiation Neural contribution to postactivation potentiation
title_full_unstemmed Neural contribution to postactivation potentiation Neural contribution to postactivation potentiation
title_short Neural contribution to postactivation potentiation
title_sort neural contribution to postactivation potentiation
title_txtP Neural contribution to postactivation potentiation
topic Postactivation potentiation supramaximal twitches corticospinal excitability ballistic performance neural drive. Biomekaniikka Biomechanics 5012 hermosto aivokuori suorituskyky
topic_facet 5012 Biomechanics Biomekaniikka Postactivation potentiation aivokuori ballistic performance corticospinal excitability hermosto neural drive. suorituskyky supramaximal twitches
url https://jyx.jyu.fi/handle/123456789/46013 http://www.urn.fi/URN:NBN:fi:jyu-201505251973
work_keys_str_mv AT ruggieroluca neuralcontributiontopostactivationpotentiation