Relationships between Trunk Righting Test Scores and Lower Back Muscle Activity When Standing on One Leg/Sitting on the Edge of the Bed

• Published in: Rigaku ryoho kagaku 2018, Vol.33(6), pp.929-934
• Main Authors: KINOSHITA, Kazuaki, HASHIMOTO, Masashi, NAKAO, Hidetoshi, OKU, Kosuke, ITAYA, Yusuke, FUKUMOTO, Takanori, TAKASHIMA, Atsushi, OTSUKI, Shingo
• Format: Article
• Language: eng ; jpn
• Subjects: Electromyography; lower back muscles; Muscle function; standing on one leg; trunk support
• ISSN: 1341-1667; 2434-2807
• DOI: 10.1589/rika.33.929

[Purpose] To clarify the relationships between Trunk Righting Test (TRT) scores, which represent trunk support, and lower back muscle activity when standing on one leg and when sitting on the edge of the bed with maximum effort. [Participants and Methods] Nine healthy males performed 3 tasks: standing on one leg, sitting on the edge of the bed, and the TRT. Their rectus abdominis, internal and external obliques, and multifidus were bilaterally measured using surface electromyography. Additionally, their transversus abdominis was measured using wire electromyography. The measurement value obtained when sitting on the edge of the bed was used as a standard to calculate the rates of increase in muscle activity when standing on one leg and when performing the TRT. The activity of each lower back muscle when performing both tasks was examined using Spearman’s rank correlation coefficient. [Results] The internal obliques and transversus abdominis on both sides and the multifidus and external obliques on the swinging side showed positive correlations. [Conclusion] Some of the lower back muscles tended to similarly contribute to trunk support when standing on one leg and when performing the TRT.