Franck Brocherie1,2, Olivier Girard3,4, Raphaël Faiss3, Grégoire P Millet3. 1. ISSUL, Institute of Sports Sciences, University of Lausanne, Building Geopolis, Campus Dorigny, 1015, Lausanne, Switzerland. franck.brocherie@insep.fr. 2. Laboratory Sport, Expertise and Performance (EA 7370), Research Department, French Institute of Sport (INSEP), Paris, France. franck.brocherie@insep.fr. 3. ISSUL, Institute of Sports Sciences, University of Lausanne, Building Geopolis, Campus Dorigny, 1015, Lausanne, Switzerland. 4. Aspetar Orthopaedic and Sports Medicine Hospital, Athlete Health and Performance Research Centre, Doha, Qatar.
Abstract
BACKGROUND: Repeated-sprint training in hypoxia (RSH) is a recent intervention regarding which numerous studies have reported effects on sea-level physical performance outcomes that are debated. No previous study has performed a meta-analysis of the effects of RSH. OBJECTIVE: We systematically reviewed the literature and meta-analyzed the effects of RSH versus repeated-sprint training in normoxia (RSN) on key components of sea-level physical performance, i.e., best and mean (all sprint) performance during repeated-sprint exercise and aerobic capacity (i.e., maximal oxygen uptake [[Formula: see text]]). METHODS: The PubMed/MEDLINE, SportDiscus®, ProQuest, and Web of Science online databases were searched for original articles-published up to July 2016-assessing changes in physical performance following RSH and RSN. The meta-analysis was conducted to determine the standardized mean difference (SMD) between the effects of RSH and RSN on sea-level performance outcomes. RESULTS: After systematic review, nine controlled studies were selected, including a total of 202 individuals (mean age 22.6 ± 6.1 years; 180 males). After data pooling, mean performance during repeated sprints (SMD = 0.46, 95% confidence interval [CI] -0.02 to 0.93; P = 0.05) was further enhanced with RSH when compared with RSN. Although non-significant, additional benefits were also observed for best repeated-sprint performance (SMD = 0.31, 95% CI -0.03 to 0.89; P = 0.30) and [Formula: see text] (SMD = 0.18, 95% CI -0.25 to 0.61; P = 0.41). CONCLUSION: Based on current scientific literature, RSH induces greater improvement for mean repeated-sprint performance during sea-level repeated sprinting than RSN. The additional benefit observed for best repeated-sprint performance and [Formula: see text] for RSH versus RSN was not significantly different.
BACKGROUND: Repeated-sprint training in hypoxia (RSH) is a recent intervention regarding which numerous studies have reported effects on sea-level physical performance outcomes that are debated. No previous study has performed a meta-analysis of the effects of RSH. OBJECTIVE: We systematically reviewed the literature and meta-analyzed the effects of RSH versus repeated-sprint training in normoxia (RSN) on key components of sea-level physical performance, i.e., best and mean (all sprint) performance during repeated-sprint exercise and aerobic capacity (i.e., maximal oxygen uptake [[Formula: see text]]). METHODS: The PubMed/MEDLINE, SportDiscus®, ProQuest, and Web of Science online databases were searched for original articles-published up to July 2016-assessing changes in physical performance following RSH and RSN. The meta-analysis was conducted to determine the standardized mean difference (SMD) between the effects of RSH and RSN on sea-level performance outcomes. RESULTS: After systematic review, nine controlled studies were selected, including a total of 202 individuals (mean age 22.6 ± 6.1 years; 180 males). After data pooling, mean performance during repeated sprints (SMD = 0.46, 95% confidence interval [CI] -0.02 to 0.93; P = 0.05) was further enhanced with RSH when compared with RSN. Although non-significant, additional benefits were also observed for best repeated-sprint performance (SMD = 0.31, 95% CI -0.03 to 0.89; P = 0.30) and [Formula: see text] (SMD = 0.18, 95% CI -0.25 to 0.61; P = 0.41). CONCLUSION: Based on current scientific literature, RSH induces greater improvement for mean repeated-sprint performance during sea-level repeated sprinting than RSN. The additional benefit observed for best repeated-sprint performance and [Formula: see text] for RSH versus RSN was not significantly different.
Authors: Franck Brocherie; Grégoire P Millet; Anna Hauser; Thomas Steiner; Julien Rysman; Jon P Wehrlin; Olivier Girard Journal: Med Sci Sports Exerc Date: 2015-10 Impact factor: 5.411
Authors: Lisa A Ridnour; Jeffrey S Isenberg; Michael G Espey; Douglas D Thomas; David D Roberts; David A Wink Journal: Proc Natl Acad Sci U S A Date: 2005-09-02 Impact factor: 11.205