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Ultrasound Does Not Detect Acute Changes in Glycogen in Vastus Lateralis of Man.

Routledge, HE, Bradley, WJ, Shepherd, SO, Cocks, MS, Erskine, RM, Close, GL and Morton, JP (2019) Ultrasound Does Not Detect Acute Changes in Glycogen in Vastus Lateralis of Man. Medicine and Science in Sports and Exercise. ISSN 0195-9131

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Abstract

PURPOSE: To examine the validity of ultrasound (via cloud based software that measures pixilation intensity according to a scale of 0-100) to non-invasively assess muscle glycogen in human skeletal muscle. METHODS: In Study 1, 14 professional male rugby league players competed in an 80-minute competitive rugby league game. In Study 2 (in a randomized repeated measures design), 16 recreationally active males completed an exhaustive cycling protocol to deplete muscle glycogen followed by 36 hours of HIGH or LOW carbohydrate intake (8 v 3 g.kg body mass). In both studies, muscle biopsies and ultrasound scans were obtained from the vastus lateralis (at 50% of the muscle length) before and after match play in Study 1 and at 36 h after glycogen depletion in Study 2. RESULTS: Despite match play reducing (P< 0.01) muscle glycogen concentration (Pre-game: 443 ± 65; Post-game: 271 ± 94 mmol.kg dw, respectively) in Study 1, there were no significant changes (P=0.4) in ultrasound scores (Pre-game: 47 ± 6, Post-game: 49 ± 7). In Study 2, muscle glycogen concentration was significantly different (P < 0.01) between HIGH (531 ± 129 mmol.kg dw) and LOW (252 ± 64 mmol.kg dw) yet there was no difference (P = 0.9) in corresponding ultrasound scores (HIGH: 56 ± 7, LOW: 54 ± 6). In both studies, no significant correlations (P>0.05) were present between changes in muscle glycogen concentration and changes in ultrasound scores. CONCLUSION: Data demonstrate that ultrasound (as based on measures of pixilation intensity) is not valid to measure muscle glycogen status within the physiological range (i.e. 200-500 mmol.kg dw) that is applicable to exercise-induced muscle glycogen utilization and post-exercise muscle glycogen re-synthesis.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences, 1117 Public Health and Health Services
Subjects: Q Science > QM Human anatomy
R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
G Geography. Anthropology. Recreation > GV Recreation Leisure > GV561 Sports
Divisions: Sports & Exercise Sciences
Publisher: Lippincott, Williams & Wilkins
Related URLs:
Date Deposited: 10 Oct 2019 09:20
Last Modified: 10 Oct 2019 09:20
DOI or Identification number: 10.1249/MSS.0000000000002052
URI: http://researchonline.ljmu.ac.uk/id/eprint/11514

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