Protection from muscle damage in the absence of changes in muscle mechanical behavior

Article


Hoffman, Ben W., Cresswell, Andrew G., Carroll, Timothy J. and Lichtwark, Glen A.. 2016. "Protection from muscle damage in the absence of changes in muscle mechanical behavior." Medicine and Science in Sports and Exercise. 48 (8), pp. 1495-1505. https://doi.org/10.1249/MSS.0000000000000920
Article Title

Protection from muscle damage in the absence of changes in muscle mechanical behavior

ERA Journal ID9788
Article CategoryArticle
AuthorsHoffman, Ben W. (Author), Cresswell, Andrew G. (Author), Carroll, Timothy J. (Author) and Lichtwark, Glen A. (Author)
Journal TitleMedicine and Science in Sports and Exercise
Journal Citation48 (8), pp. 1495-1505
Number of Pages11
Year2016
PublisherLippincott Williams & Wilkins
Place of PublicationUnited States
ISSN0195-9131
1530-0315
Digital Object Identifier (DOI)https://doi.org/10.1249/MSS.0000000000000920
Web Address (URL)https://journals.lww.com/acsm-msse/Fulltext/2016/08000/Protection_from_Muscle_Damage_in_the_Absence_of.9.aspx
Abstract

Introduction: The repeated bout effect characterizes the protective adaptation after a single bout of unaccustomed eccentric exercise that induces muscle damage. Sarcomerogenesis and increased tendon compliance have been suggested as potential mechanisms for the repeated bout effect by preventing muscle fascicles from being stretched onto the descending limb of the length–tension curve (the region where sarcomere damage is thought to occur). In this study, evidence was sought for three possible mechanical changes that would support either the sarcomerogenesis or the increased tendon compliance hypotheses: a sustained rightward shift in the fascicle length–tension relationship, reduced fascicle strain amplitude, and reduced starting fascicle length. Methods: Subjects (n = 10) walked backward downhill (5 km/h, 20% incline) on a treadmill for 30 min on two occasions separated by 7 d. Kinematic data and medial gastrocnemius fascicle lengths (ultrasonography) were recorded at 10-min intervals to compare fascicle strains between bouts. Fascicle length–torque curves from supramaximal tibial nerve stimulation were constructed before, 2 h after, and 2 d after each exercise bout. Results: Maximum torque decrement and elevated muscle soreness were present after the first, but not the second, backward downhill walking bout signifying a protective repeated bout effect. There was no sustained rightward shift in the length–torque relationship between exercise bouts, nor decreases in fascicle strain amplitude or shortening of the starting fascicle length. Conclusions: Protection from a repeated bout of eccentric exercise was conferred without changes in muscle fascicle strain behavior, indicating that sarcomerogenesis and increased tendon compliance were unlikely to be responsible. As fascicle strains are relatively small in humans, we suggest that changes to connective tissue structures, such as extracellular matrix remodeling, are better able to explain the repeated bout effect observed here.

Keywordseccentric exercise; ultrasound, Length–Tension relationship; strain-induced muscle damage
ANZSRC Field of Research 2020420702. Exercise physiology
420701. Biomechanics
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsUniversity of Queensland
Institution of OriginUniversity of Southern Queensland
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