Effects of knee flexor submaximal isometric contraction until exhaustion on semitendinosus and biceps femoris long head shear modulus in healthy individuals

This study examined whether a knee flexor isometric contraction at 20% of maximal voluntary isometric contraction until exhaustion would alter the biceps femoris long head (BFlh) and semitendinosus (ST) active stiffness, assessed using ultrasound-based shear wave elastography. Twelve healthy individ...

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Veröffentlicht in:	Scientific reports 2020-10, Vol.10 (1), p.16433-16433, Article 16433
Hauptverfasser:	Mendes, Bruno, Firmino, Telmo, Oliveira, Raúl, Neto, Tiago, Cruz-Montecinos, Carlos, Cerda, Mauricio, Correia, José P., Vaz, João R., Freitas, Sandro R.
Format:	Artikel
Sprache:	eng
Schlagworte:	692/698/1671/1668/1973 692/700/1421/1860 Adult Elasticity Imaging Techniques - methods Electromyography - methods Fatigue Femur Head - physiology Humanities and Social Sciences Humans Isometric Isometric Contraction - physiology Knee Knee - physiology Knee Joint - physiology Male multidisciplinary Muscle contraction Muscle, Skeletal - physiology Range of Motion, Articular - physiology Science Science (multidisciplinary) Ultrasonography - methods Ultrasound Young Adult
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Zusammenfassung:	This study examined whether a knee flexor isometric contraction at 20% of maximal voluntary isometric contraction until exhaustion would alter the biceps femoris long head (BFlh) and semitendinosus (ST) active stiffness, assessed using ultrasound-based shear wave elastography. Twelve healthy individuals participated in 2 sessions separated by 7 days. Time to exhaustion was similar in both sessions (day 1: 443.8 ± 192.5 s; day 2: 474.6 ± 131.7 s; p = 0.323). At the start of the fatigue task, the ST showed greater active stiffness than the BFlh (p
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-020-73433-1