Universität zu Köln

Simunic, Bostjan, Koren, Katja, Rittweger, Jorn ORCID: 0000-0002-2223-8963, Lazzer, Stefano, Reggiani, Carlo ORCID: 0000-0001-8080-361X, Rejc, Enrico ORCID: 0000-0001-9368-2220, Pisot, Rado, Narici, Marco and Degens, Hans (2019). Tensiomyography detects early hallmarks of bed-rest-induced atrophy before changes in muscle architecture. J. Appl. Physiol., 126 (4). S. 815 - 823. BETHESDA: AMER PHYSIOLOGICAL SOC. ISSN 1522-1601

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Abstract

In young and older people, skeletal muscle mass is reduced after as little as 7 days of disuse. The declines in muscle mass after such short periods are of high clinical relevance, particularly in older people who show a higher atrophy rate and a slower or even a complete lack of muscle mass recovery after disuse. Ten men (24.3 yr; SD 2.6) underwent 35 days of 6 degrees head-down tilt bed rest, followed by 30 days of recovery. During bed rest, a neutral energy balance was maintained, with three weekly passive physiotherapy sessions to minimize muscle soreness and joint stiffness. All measurements were performed in a hospital at days 1-10, 16, 28, and 35 of bed rest (BR1-BR10, BR16, BR28, and BR35, respectively) and days 1, 3, and 30 after reambulation (R + 1, R + 3, and R + 30, respectively). Vastus medialis obliquus (VMO), vastus medialis longus (VML), and biceps femoris (BF) thickness (d) and pennation angle (Theta) were assessed by ultrasonography, whereas twitch muscle belly displacement (Dm) and contraction time (Tc) were assessed with tensiomyography (TMG). After bed rest, d and Theta decreased by 13-17% in all muscles (P < 0.001) and had recovered at R + 30. Dm was increased by 42.3-84.4% (P < 0.001) at BR35 and preceded the decrease in d by 7, 5, and 3 days in VMO, VML, and BF, respectively. Tc increased only in BF (32.1%; P < 0.001) and was not recovered at R + 30. TMG can detect early bed-rest-induced changes in muscle with higher sensitivity before overt architectural changes, and atrophy can be detected. NEW & NOTEWORTHY Detection of early atrophic processes and irreversible adaptation to disuse are of high clinical relevance. With the use of tensiomyography (TMG), we detected early atrophic processes before overt architectural changes, and atrophy can be detected using imaging technique. Furthermore, TMG detected irreversible changes of biceps femoris contraction time.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Simunic, Bostjan UNSPECIFIED UNSPECIFIED UNSPECIFIED Koren, Katja UNSPECIFIED UNSPECIFIED UNSPECIFIED Rittweger, Jorn UNSPECIFIED orcid.org/0000-0002-2223-8963 UNSPECIFIED Lazzer, Stefano UNSPECIFIED UNSPECIFIED UNSPECIFIED Reggiani, Carlo UNSPECIFIED orcid.org/0000-0001-8080-361X UNSPECIFIED Rejc, Enrico UNSPECIFIED orcid.org/0000-0001-9368-2220 UNSPECIFIED Pisot, Rado UNSPECIFIED UNSPECIFIED UNSPECIFIED Narici, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Degens, Hans UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-151799
DOI:	10.1152/japplphysiol.00880.2018
Journal or Publication Title:	J. Appl. Physiol.
Volume:	126
Number:	4
Page Range:	S. 815 - 823
Date:	2019
Publisher:	AMER PHYSIOLOGICAL SOC
Place of Publication:	BETHESDA
ISSN:	1522-1601
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GASTROCNEMIUS MEDIALIS MUSCLE; CONTRACTILE PROPERTIES; HUMAN SOLEUS; VISCOELASTIC PROPERTIES; TENDON STRUCTURES; WEIGHT-BEARING; DISUSE; SPACEFLIGHT; PARAMETERS; THICKNESS Multiple languages Physiology; Sport Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15179