Post-activation muscle potentiation and its relevance to cyclical behaviours
| Autor: | Kari R Taylor-Burt, Nicolai Konow, Andrew A. Biewener |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
medicine.medical_specialty
Contraction (grammar) Stimulation Biology 03 medical and health sciences 0302 clinical medicine Internal medicine medicine Animals Biomechanics 030212 general & internal medicine Muscle Skeletal Swimming Animal locomotion Work (physics) Long-term potentiation 030229 sport sciences Agricultural and Biological Sciences (miscellaneous) Endocrinology Ducks Length change General Agricultural and Biological Sciences Cycle frequency Locomotion Lateral gastrocnemius Muscle Contraction |
| Zdroj: | Biol Lett |
| Popis: | Muscle can experience post-activation potentiation (PAP), a temporary increase in force and rate of force development, when contractions are closely timed; therefore, cyclical behaviours are likely affected by PAP, as succeeding contraction cycles can lead to potentiation over several subsequent cycles. Here, we examined PAP duringin situcyclical contractions of the mallard lateral gastrocnemius (LG). Surface swimming, a cyclical behaviour, was mimicked with work-loops usingin vivoLG length change and stimulation parameters. Tests were performed at mallards' preferred cycle frequency as well as at lower and higher frequencies. Like muscles from mammals, anurans and arthropods, the mallard LG exhibited PAP with increases in peak force, average force rate and net work. Staircase potentiation occurred over two or more work-loop cycles, resulting in gradual increases in PAP. The number of cycles needed to reach maximum work varied with cycle frequency, requiring more cycles at higher cycle frequencies. PAP occurred underin vivo-like stimulation parameters, suggesting a potentially important role of PAP in animal locomotion, especially in cyclical behaviours. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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