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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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Ultrasound does not detect acute changes in glycogen in vastus lateralis of man.pdf - Accepted Version Download (1MB) | Preview |
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 |
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| 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: | Sport & Exercise Sciences |
| Publisher: | Lippincott, Williams & Wilkins |
| Related URLs: | |
| Date Deposited: | 10 Oct 2019 09:20 |
| Last Modified: | 04 Sep 2021 08:42 |
| DOI or ID number: | 10.1249/MSS.0000000000002052 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/11514 |
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