NDLI: Sprint interval training in hypoxia stimulates glycolytic enzyme activity.

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Sprint interval training in hypoxia stimulates glycolytic enzyme activity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Puype, Joke Van Proeyen, Karen Raymackers, Jean-Marc Deldicque, Louise Hespel, Peter
Description	Country affiliation: Belgium Author Affiliation: Puype J ( 1Exercise Physiology Research Group, Department of Kinesiology, KU Leuven, Leuven, BELGIUM)
Abstract	PURPOSE: In this study, we compared the effect of sprint interval training (SIT) in normoxia versus hypoxia on muscle glycolytic and oxidative capacity, monocarboxylate transporter content, and endurance exercise performance. METHODS: Healthy male volunteers (18-30 yr) performed 6 wk of SIT on a cycling ergometer (30-s sprints vs 4.5-min rest intervals; 3 d · wk(-1)) in either normobaric hypoxia (HYP, FiO2 = 14.4%, n = 10) or normoxia (NOR, FiO2 = 20.9%, n = 9). The control group did not train (CON, n = 10). Training load was increased from four sprints per session in week 1 to nine sprints in week 6. Before and after SIT, subjects performed a maximal incremental exercise test plus a 10-min simulated time trial on a cycle ergometer in both normoxia (MAX nor and TT nor) and hypoxia (MAX hyp and TT hyp). A needle biopsy was taken from musculus vastus lateralis at rest 5-6 d after the last exercise session. RESULTS: SIT increased muscle phosphofructokinase activity more in HYP (+59%, P < 0.05) than that in NOR (+17%), whereas citrate synthase activity was similar between groups. Compared with the pretest, power outputs corresponding to 4 mmol blood lactate in HYP during MAX nor (+7%) and MAX hyp (+9%) were slightly increased (P < 0.05), whereas values were constant in NOR. V·O 2max in MAX nor and TT performance in TT nor and TT hyp were increased by ≈ 6%-8% (P < 0.05) in either group. The training elevated monocarboxylate transporter 1 protein content by ≈ 70% (P < 0.05). In CON, all measurements were constant throughout the study. CONCLUSION: SIT in hypoxia up-regulated muscle phosphofructokinase activity and the anaerobic threshold more than SIT in normoxia but did not enhance endurance exercise performance.
ISSN	01959131
Issue Number	11
Volume Number	45
e-ISSN	15300315
Journal	Medicine & Science in Sports & Exercise
Language	English
Publisher	Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine)
Publisher Date	2013-11-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anoxia Enzymology Physical Conditioning, Human Physiology Physical Endurance Quadriceps Muscle Metabolism Adolescent Adult Anaerobic Threshold Bicycling Citrate (si)-synthase Exercise Test Glycogen Humans Physiopathology Male Monocarboxylic Acid Transporters Muscle Proteins Oxygen Consumption Phosphofructokinases Symporters Young Adult Journal Article Research Support, Non-u.s. Gov't Discipline Sports Science
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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