Similarity of muscle synergies extracted from the lower limb including the deep muscles between level and uphill treadmill walking

• Published in: Gait & posture 2018-01, Vol.59, p.134-139
• Main Authors: Saito, Akira, Tomita, Aya, Ando, Ryosuke, Watanabe, Kohei, Akima, Hiroshi
• Format: Article
• Language: English
• Subjects: Adult; Electromyography; Exercise Test; Female; Gait analysis; Hip adductors; Humans; Lower Extremity - physiology; Male; Muscle, Skeletal - physiology; Non-negative matrix factorization; Surface electromyography; Ultrasonography; Vastus intermedius; Walking - physiology; Young Adult
• ISSN: 0966-6362; 1879-2219
• DOI: 10.1016/j.gaitpost.2017.10.007

•Synergies of the lower limb including deep muscles are poorly understood.•Muscle synergies were identified under locomotion with or without ground elevation.•Four synergies were extracted by a non-negative matrix factorization algorithm.•The synergies appear to be consistent across different walking tasks.•Specific synergy coordinates adductor magnus and rectus femoris muscle activities. This study aimed to examine muscle synergies involving the deeper muscles of the lower limb during level and uphill treadmill walking. Seven men and five women walked on a treadmill at three speeds (60, 80, and 100m/min) and two grades (level and 10% grade). Surface electromyographic (EMG) signals were recorded from 10 muscles of the lower limb, including vastus intermedius, adductor magnus, and adductor longus. Muscle synergies were extracted applying non-negative matrix factorization, and the relative co-activation across muscles and the temporal information of synergy recruitment were identified by the muscle synergy vector and synergy activation coefficient, respectively. Correlation coefficients between a pair of synergy vectors during level and uphill walking were analyzed as a similarity index, with the similarity criterion at r=0.76. Changes in synergy activation coefficients between the walking conditions were evaluated by cross-correlation analysis. The mean number of synergies ranged from 3.8 to 4.0 across all conditions, and they were not significantly different between level and uphill walking conditions. Similarity between walking conditions was high (r>0.76) for three muscle synergies, but not for one synergy that mainly consisted of the quadriceps femoris. The inter-condition similarity of the synergy activation coefficients was high for the four synergies, and a significant lag time for synergy 2, which consisted mainly of the activity of medial gastrocnemius, was found at 60 and 80m/min. The muscle synergies extracted from the lower limb involving the deeper muscles appear to be consistent during level and uphill treadmill walking.