Effects of voluntary vocalization “Dokkoisho”and forward leaning of the trunk from the sitting to standing position on muscle activity of the trunk and lower-limb muscles

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  • Sato Eiji
    School of Nursing, Oita University of Nursing and Health Sciences

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  • 自発的かけ声「どっこいしょ」と立ち上がり動作の体幹前傾動作が体幹および下肢筋活動に及ぼす影響

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One method to effectively promote muscle activities is the vocalization of verbal calls during exercise. The purpose of this study was to investigate the relationship between the angle of forward trunk tilt (posture) and vocalization. The angle of forward trunk tilt is a factor that influences the sit-to-stand (STS) motion, while the vocalization has been reported to promote muscle activity. The study participants were 20 healthy adult men. Electromyography data were normalized by maximum voluntary contraction (MVC) values and set as %MVC. The magnitude evaluation value was used for the subjective evaluation of standing motion load. The %MVC of each muscle, the magnitude value, and the trunk forward tilt angle were set as dependent variables, and with or without vocalization and three posture conditions (normal STS, STS while leaning the trunk forward as much as possible, and STS while keeping the trunk as vertical as possible) were set as experimental variables. Two-way analysis of variance was then carried out. Vocalizing during STS increased muscle activity in the hip extensors (gluteus maximus and biceps femoris), but subjective assessments showed a reduction in load. The findings suggest that vocalization during STS effectively uses hip extensors and subjectively reduces the load.

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