![]() ![]() Additionally, the areas under the temporal activation patterns in several synergies in both legs decreased. We found that during split-belt walking, the number of synergies in the slow leg increased while an extra synergy appeared and disappeared in the fast leg. Muscle synergies were extracted by applying non-negative matrix factorization to the EMG data of each leg. Twelve healthy young males participated, and surface electromyography (EMG) signals were recorded bilaterally from 13 lower-limb muscles. Hence, we chronologically extracted muscle synergies while walking on the split-belt treadmill and examined changes in the number, muscle weightings, and temporal activation patterns of muscle synergies. To date, it remains unclear how such muscle synergies change during the adaptation and de-adaptation processes on the split-belt treadmill. Muscle synergies are considered the fundamental building blocks of movement and are groups of coactive muscles and time-varying activation patterns, thereby, reflecting the neurophysiological characteristics of movement. Meanwhile, in the motor control field, the muscle synergy concept has been proposed. Thus far, neuromuscular control in split-belt locomotor adaptation has been evaluated by analyzing muscle activities at the individual muscle level. Humans have great locomotor adaptability to environmental demands, which has been investigated using a split-belt treadmill with belts on both the left and right sides. 3Faculty of Health and Sports Science, Doshisha University, Kyoto, Japan.2Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan. ![]()
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