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Glycogen Utilization during Running: Intensity, Sex, and Muscle-specific Responses.

Impey, SG, Jevons, EFP, Mees, G, Cocks, MS, Strauss, JA, Chester, N, Laurie, I, Target, D, Hodgson, A, Shepherd, SO and Morton, JP (2020) Glycogen Utilization during Running: Intensity, Sex, and Muscle-specific Responses. Medicine and Science in Sports and Exercise. ISSN 1530-0315

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Abstract

PURPOSE: To quantify net glycogen utilisation in the vastus lateralis (VL) and gastrocnemius (G) of male (n=11) and female (n=10) recreationally active runners during three outdoor training sessions. METHODS: After 2 days standardisation of carbohydrate (CHO) intakes (6 g.kg body mass per day), glycogen was assessed before and after 1) a 10-mile road run (10-mile) at lactate threshold, 2) 8 x 800 m track intervals (8 x 800 m) at velocity at V[Combining Dot Above]O2max and 3) 3 x 10 minute track intervals (3 x 10 min) at lactate turnpoint. RESULTS: Resting glycogen concentration was lower in the G of females compared with males (P<0.001) though no sex differences were apparent in the VL (P=0.40). Within the G and VL of males, net glycogen utilisation differed between training sessions where 10-mile was greater than both track sessions (all comparisons, P<0.05). In contrast, net glycogen utilisation in females was not different between training sessions in either muscle (all comparisons, P>0.05). Net glycogen utilisation was greater in males than females in both VL (P=0.02) and G (P=0.07) during the 10-mile road run. With the exception of males during the 3 x 10 min protocol (P=0.28), greater absolute glycogen utilisation was observed in the G versus the VL muscle in both males and females and during all training protocols (all comparisons, P<0.05). CONCLUSION: Data demonstrate 1) prolonged steady state running necessitates a greater glycogen requirement than shorter but higher intensity track running sessions, 2) females display evidence of reduced resting muscle glycogen concentration and net muscle glycogen utilisation when compared with males and 3), net glycogen utilisation is higher in the gastrocnemius muscle compared with the vastus lateralis.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences, 1117 Public Health and Health Services
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sports & Exercise Sciences
Publisher: American College of Sports Medicine
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Date Deposited: 17 Mar 2020 09:35
Last Modified: 17 Mar 2020 09:35
DOI or Identification number: 10.1249/MSS.0000000000002332
URI: http://researchonline.ljmu.ac.uk/id/eprint/12507

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