Reliability of and Correlation Among Electromyographic Normalization Procedures for Biceps Brachii Muscle: A Comparison of Maximal and Submaximal Isometric Voluntary Contractions

Yıl 2022, Cilt: 33 Sayı: 3, 180 - 189, 31.10.2022

Pınar Arpınar Avsar , Hüseyin Çelik

https://doi.org/10.17644/sbd.1139261

Öz

Normalization of surface electromyography (sEMG) signal amplitude is considered as a necessary operation to enable comparable data on different muscles, individuals, and sessions. Previous studies usually suggested using the maximal contraction normalization procedure. However, that procedure might not always be possible or the best method in some sEMG studies. The purpose of this study is therefore twofold. The first is to investigate reliability of two different constant load normalization procedures (with and without feedback) at different constant-force submaximal contractions. The second is to investigate correlation of normalization factors obtained from maximal voluntary and standardized submaximal tasks. 18 young healthy participants took part in the study. Subjects performed three muscle contraction tasks, namely, (i) maximal voluntary contraction (MVC) task: isometric maximal contraction of biceps brachii muscle, (ii) force matching task (FM): matching 2.5 kg, 5.0 kg, 7.5 kg and 10.0 kg force with visual feedback, and (iii) load holding (LH) task: holding 2.5 kg, 5.0 kg, 7.5 kg and 10.0 kg weights without visual feedback. sEMG amplitude normalization factors were examined for three tasks. The results of the study suggested that the reliability of sEMG amplitude normalization factors from FM and LH tasks for four target forces or loads were high (intraclass correlation (ICC): 0.863-0.958) to very high (ICC: 0.970-0.995). Due to some limitations of the MVC maximal contraction normalization procedure, normalization to the maximal might not always be possible or the best method for some sEMG studies. In such cases, submaximal isometric load holding tasks could be an alternative to the MVC task for biceps brachii muscle.

Anahtar Kelimeler

electromyography, biceps brachii, normalization

Destekleyen Kurum

TUBITAK

Proje Numarası

115S535

Teşekkür

None.

Biceps Brachii Kasi İçin Maksimal ve Sabit Yük Altinda Submaksimal Kasilmalara Göre Elektromiyografik Normalizasyon Yöntemlerinin Güvenilirliği ve Korelasyonu

Öz

Yüzeyel elektromiyografi (yEMG) sinyal genliğinin normalleştirilmesi, farklı kaslar, bireyler, seanslar arasında karşılaştırılabilir veriler sağlamak için gerekli bir işlem olarak kabul edilir. Önceki çalışmalar genellikle maksimal istemli kasılma normalizasyon yöntemini kullanmayı önermiştir. Ancak, bu yöntem bazı yEMG çalışmalarında her zaman mümkün ya da en iyi yöntem olmayabilir. Bu çalışmanın iki temel amacı vardır. Birincisi, farklı yükler altında iki farklı submaksimal izometrik kasılma normalizasyon prosedürünün (görsel geri beslemeli ve geri beslemesiz) güvenilirliğini araştırmaktır. İkincisi, maksimal istemli kasılma ve submaksimal izometrik kasılma görevlerinden elde edilen normalizasyon değerleri arasındaki korelasyonu araştırmaktır. Bu deneysel çalışmaya 18 genç sağlıklı katılımcı gönüllü olarak katılmıştır. Denekler üç kas kasılması görevi gerçekleştirdiler. Bunlar sırasıyla şöyledir: (i) maksimal istemli kasılma görevi: biseps brachii kasının izometrik maksimal istemli kasılması, (ii) kuvvet eşleştirme görevi: 2.5 kg, 5.0 kg, 7.5 kg ve 10.0 kg yük ve görsel geri bildirim ile, (iii) yük tutma görevi: görsel geri bildirim olmadan 2,5 kg, 5,0 kg, 7,5 kg ve 10,0 kg ağırlıkları tutmak. yEMG genlik normalizasyon değerleri üç görev için incelenmiştir. Çalışmanın sonuçları, kuvvet eşleştirme ve yük tutma görevlerinden elde edilen normalizasyon değerlerinin güvenilirliğin yüksek (güvenirlik katsayısı 0.863 ve 0.958 arasında) ya da çok yüksek (güvenirlik katsayısı 0.970 ve 0.995 arasında) olduğunu göstermiştir. Maksimal istemli kasılma normalizasyon yönteminin bazı sınırlılıkları nedeniyle, bazı yEMG çalışmaları için maksimale göre normalizasyon her zaman mümkün ya da en iyi yöntem olmayabilir. Bu gibi durumlarda, submaksimal izometrik yük tutma görevi, biceps brachii kası için maksimal istemli kasılma görevine tekrarlanabilir bir alternatif olabilir.

Anahtar Kelimeler

elektromiyografi, normalizasyon, biseps brachii

Proje Numarası

115S535

Kaynakça

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