Muscle synergies are consistent across level and uphill treadmill running

This study aimed to identify muscle synergies of the lower limb during treadmill running on level and inclined ground. Eight subjects ran on a treadmill at three speeds (2.5, 3.3, and 4.1 m/s) and two grades (level and 10% grade). Surface electromyographic (EMG) signals were recorded from 10 muscles...

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Vydané v:Scientific reports Ročník 8; číslo 1; s. 5979 - 10
Hlavní autori: Saito, Akira, Tomita, Aya, Ando, Ryosuke, Watanabe, Kohei, Akima, Hiroshi
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Nature Publishing Group UK 13.04.2018
Nature Publishing Group
Predmet:
631/378/2632/2633
692/698/1688/1366/1823
Electromyography
Fitness equipment
Humanities and Social Sciences
multidisciplinary
Muscles
Running
Science
Science (multidisciplinary)
ISSN:2045-2322, 2045-2322
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Shrnutí:This study aimed to identify muscle synergies of the lower limb during treadmill running on level and inclined ground. Eight subjects ran on a treadmill at three speeds (2.5, 3.3, and 4.1 m/s) and two grades (level and 10% grade). Surface electromyographic (EMG) signals were recorded from 10 muscles of the lower limb, including deeper muscles such as vastus intermedius, adductor magnus, and adductor longus. Muscle synergies were extracted applying a non-negative matrix factorization algorithm, and relative co-activations across muscles and the temporal recruitment pattern were identified by muscle synergy vector and synergy activation coefficient, respectively. The scalar product between pairs of synergy vectors and synergy activation coefficients during level and uphill running conditions were analyzed as a similarity index, with values above 0.8 recognized as similar. Approximately 4 muscle synergies controlled the majority of variability in 10 EMGs during running, and were common between level and uphill conditions. At each running speed, inter-condition similarity was observed in synergy vector ( r  > 0.83) and synergy activation coefficients ( r  > 0.84) at each type of synergy. These results suggest that types of synergy are consistent between level and uphill running.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-24332-z