Glycogen Utilization during Running: Intensity, Sex, and Muscle-Specific Responses.
Adult
Blood Glucose
/ metabolism
Fatty Acids, Nonesterified
/ blood
Female
Glycerol
/ blood
Glycogen
/ metabolism
Humans
Lactic Acid
/ blood
Male
Muscle, Skeletal
/ metabolism
Physical Endurance
/ physiology
Quadriceps Muscle
/ metabolism
Running
/ physiology
Sex Characteristics
Sex Factors
Young Adult
Journal
Medicine and science in sports and exercise
ISSN: 1530-0315
Titre abrégé: Med Sci Sports Exerc
Pays: United States
ID NLM: 8005433
Informations de publication
Date de publication:
09 2020
09 2020
Historique:
pubmed:
14
3
2020
medline:
9
2
2021
entrez:
14
3
2020
Statut:
ppublish
Résumé
This study aimed to quantify net glycogen utilization in the vastus lateralis (VL) and gastrocnemius (G) of male (n = 11) and female (n = 10) recreationally active runners during three outdoor training sessions. After 2-d standardization of carbohydrate 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 × 800-m track intervals (8 × 800 m) at velocity at V˙O2max, and 3) 3 × 10-min track intervals (3 × 10 min) at lactate turnpoint. Resting glycogen concentration was lower in the G of female compared with males (P < 0.001) runners, although no sex differences were apparent in the VL (P = 0.40). Within the G and VL of male runners, net glycogen utilization differed between training sessions where 10 miles was greater than both track sessions (all comparisons, P < 0.05). In contrast, net glycogen utilization in female runners was not different between training sessions in either muscle (all comparisons, P > 0.05). Net glycogen utilization was greater in male than in female runners in both VL (P = 0.02) and G (P = 0.07) during the 10-mile road run. With the exception of male runners during the 3 × 10-min protocol (P = 0.28), greater absolute glycogen utilization was observed in the G versus the VL muscle in both male and female runners and during all training protocols (all comparisons, P < 0.05). Data demonstrate that 1) prolonged steady-state running necessitates a greater glycogen requirement than shorter but higher-intensity track running sessions, 2) female participants display evidence of reduced resting muscle glycogen concentration and net muscle glycogen utilization when compared with male participants, and 3) net glycogen utilization is higher in the G muscle compared with the VL.
Identifiants
pubmed: 32168106
doi: 10.1249/MSS.0000000000002332
pii: 00005768-202009000-00014
doi:
Substances chimiques
Blood Glucose
0
Fatty Acids, Nonesterified
0
Lactic Acid
33X04XA5AT
Glycogen
9005-79-2
Glycerol
PDC6A3C0OX
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1966-1975Références
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