Postactivation Potentiation and the Asynchronous Action of Muscular and Neural Responses
PURPOSE: This study examined the underlying mechanisms of postactivation potentiation and the time course of muscular- and neural-related variables.
METHODS: Fourteen trained males executed 4 sets of six 6-second maximum isometric conditioning plantar flexions, with 15 seconds and 2 minutes of interval between the contractions and sets, respectively. Peak twitch torque (TT), rate of torque development, time to peak torque, half relaxation time, and the neural-related variables of H-reflex and electromyogram, normalized to the maximum M-wave (H/M and RMS/M, respectively), were evaluated, as well as the level of the voluntary activation, assessed by the twitch interpolation technique. All neural-related variables were analyzed for the trial within each set when TT was maximal and for the trial within each set when the neural-related variable itself was maximal.
RESULTS: Compared with the baseline measures, TT and rate of torque development significantly increased in all sets (P < .001), whereas time to peak torque and half relaxation time significantly decreased in sets 1 to 4 and 2 to 4, respectively (P < .001). However, H/M and the RMS/M did not change for the repetition of each set for which the TT was maximal (P > .05). Interestingly, the within-set maximum H/M ratio of the lateral gastrocnemius muscle revealed a significant increase in all sets (P < .05), compared with the baseline measures.
CONCLUSION: One set of 4 contractions with 6-second duration is sufficient to cause postactivation potentiation for most participants, whereas peak TT augmentation does not coincide with changes in the examined neural-related variables. Further experiments should consider the time lag on their maximal values and their inherent between-participants variability.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:18 |
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| Enthalten in: |
International journal of sports physiology and performance - 18(2023), 8 vom: 01. Aug., Seite 852-860 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Xenofondos, Anthi [VerfasserIn] |
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| Links: |
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| Themen: |
Electromyography |
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| Anmerkungen: |
Date Completed 31.07.2023 Date Revised 31.07.2023 published: Electronic-Print Citation Status MEDLINE |
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| doi: |
10.1123/ijspp.2022-0336 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM357975448 |
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| 500 | |a Date Completed 31.07.2023 | ||
| 500 | |a Date Revised 31.07.2023 | ||
| 500 | |a published: Electronic-Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a PURPOSE: This study examined the underlying mechanisms of postactivation potentiation and the time course of muscular- and neural-related variables | ||
| 520 | |a METHODS: Fourteen trained males executed 4 sets of six 6-second maximum isometric conditioning plantar flexions, with 15 seconds and 2 minutes of interval between the contractions and sets, respectively. Peak twitch torque (TT), rate of torque development, time to peak torque, half relaxation time, and the neural-related variables of H-reflex and electromyogram, normalized to the maximum M-wave (H/M and RMS/M, respectively), were evaluated, as well as the level of the voluntary activation, assessed by the twitch interpolation technique. All neural-related variables were analyzed for the trial within each set when TT was maximal and for the trial within each set when the neural-related variable itself was maximal | ||
| 520 | |a RESULTS: Compared with the baseline measures, TT and rate of torque development significantly increased in all sets (P < .001), whereas time to peak torque and half relaxation time significantly decreased in sets 1 to 4 and 2 to 4, respectively (P < .001). However, H/M and the RMS/M did not change for the repetition of each set for which the TT was maximal (P > .05). Interestingly, the within-set maximum H/M ratio of the lateral gastrocnemius muscle revealed a significant increase in all sets (P < .05), compared with the baseline measures | ||
| 520 | |a CONCLUSION: One set of 4 contractions with 6-second duration is sufficient to cause postactivation potentiation for most participants, whereas peak TT augmentation does not coincide with changes in the examined neural-related variables. Further experiments should consider the time lag on their maximal values and their inherent between-participants variability | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a H-reflex | |
| 650 | 4 | |a M-wave | |
| 650 | 4 | |a electromyography | |
| 650 | 4 | |a fatigue | |
| 650 | 4 | |a twitch torque | |
| 700 | 1 | |a Papavasileiou, Anastasia |e verfasserin |4 aut | |
| 700 | 1 | |a Bassa, Eleni |e verfasserin |4 aut | |
| 700 | 1 | |a Vrabas, Ioannis S |e verfasserin |4 aut | |
| 700 | 1 | |a Patikas, Dimitrios A |e verfasserin |4 aut | |
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