+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Simulated rugby performance at 1550-m altitude following adaptation to intermittent normobaric hypoxia

Simulated rugby performance at 1550-m altitude following adaptation to intermittent normobaric hypoxia

Journal of Science and Medicine in Sport 11(6): 593-599

Team-sport athletes who normally reside at sea level occasionally play games at altitudes sufficient to impair endurance performance. To investigate the effect of intermittent normobaric hypoxic exposure on performance in generic and game-specific tests at altitude, 22 senior club level rugby players performed baseline tests before single-blind random assignment to one of three groups: hypoxia-altitude (n=9), normoxia-altitude (n=6), and normoxia-sea level (n=7). The hypoxia-altitude group underwent 9-13 sessions of intermittent hypoxic exposure (concentration of inspired oxygen=13-10%) over 15 days, then repeated the performance tests within 12h of travelling to 1550m. The normoxia-altitude group underwent placebo exposures by breathing room air before repeating the tests at altitude, whereas the normoxia-sea level group underwent placebo exposures before repeating the tests at sea level. Hypoxic exposure consisted of alternately breathing 6min hypoxic gas and 4min ambient air for 1h at rest. Performance measures gathered at each testing session were maximum speed, sub-maximum heart-rate speed and sub-maximum lactate speed during a 20-m incremental running test, mean time in six 70-m sprints, repetitive explosive power and other measures from seven 5.5-min circuits of a rugby simulation. Repetitive explosive power ( approximately -16%) and 20-m shuttle performance ( approximately -3%) decreased substantially at altitude compared to sea level. Acclimatisation to hypoxia had a beneficial effect on sub-maximum heart rate and lactate speed but little effect on other performance measures. In conclusion, 1550-m altitude substantially impaired some measures of performance and the effects of prior adaptation via 9-13 sessions of intermittent hypoxia were mostly unclear.

(PDF emailed within 0-6 h: $19.90)

Accession: 055783316

Download citation: RISBibTeXText

PMID: 17719848

DOI: 10.1016/j.jsams.2007.07.005

Related references

Normobaric-hypoxia Performance characteristics of simulated altitude tents. Medicine & Science in Sports & Exercise 33(5 Supplement): S60, 2001

Normobaric Intermittent Hypoxia over 8 Months Does Not Reduce Body Weight and Metabolic Risk Factors--a Randomized, Single Blind, Placebo-Controlled Study in Normobaric Hypoxia and Normobaric Sham Hypoxia. Obesity Facts 8(3): 200-209, 2016

Intermittent normobaric hypoxia facilitates high altitude acclimatization by curtailing hypoxia-induced inflammation and dyslipidemia. Pflugers Archiv 2019, 2019

Ventilation during simulated altitude, normobaric hypoxia and normoxic hypobaria. Respiration Physiology 107(3): 231-239, 1997

Acute ventilatory response to simulated altitude, normobaric hypoxia, and hypobaria. Aviation, Space, and Environmental Medicine 67(11): 1019-1022, 1996

A Four-Way Comparison of Cardiac Function with Normobaric Normoxia, Normobaric Hypoxia, Hypobaric Hypoxia and Genuine High Altitude. Plos One 11(4): E0152868, 2016

Intermittent normobaric hypoxia as a model of incomplete adaptation. Fiziologiia Cheloveka 30(5): 85-91, 2004

Acute mountain sickness: increased severity during simulated altitude compared with normobaric hypoxia. Journal of Applied Physiology 81(5): 1908-1910, 1996

The effects of nightly normobaric hypoxia and high intensity training under intermittent normobaric hypoxia on running economy and hemoglobin mass. Journal of Applied Physiology 103(3): 828-834, 2007

Brain enzyme adaptation to mild normobaric intermittent hypoxia. Journal of Neuroscience Research 16(2): 419-428, 1986

Effects of simulated altitude (normobaric hypoxia) on cardiorespiratory parameters and circulating endothelial precursors in healthy subjects. Respiratory Research 8: 58, 2007

The evaluation of the efficacy of adaptation to intermittent normobaric hypoxia as a method for treating hypertension. Voprosy Kurortologii, Fizioterapii, i Lechebnoi Fizicheskoi Kultury 1993(5): 9-12, 1993

Effect of adaptation to intermittent normobaric hypoxia on cardiomyocyte ultrastructure in pregnant rats. Byulleten' Eksperimental'noi Biologii i Meditsiny 119(6): 597-602, 1995

Physiological substantiation of the method for increasing nonspecific resistance by adaptation to intermittent normobaric hypoxia. Fiziologicheskii Zhurnal 38(5): 13-17, 1992

Effect of adaptation to intermittent normobaric hypoxia on the ultrastructure of cardiac myocytes in pregnant rats. Bulletin of Experimental Biology and Medicine 119(6): 574-579, 1995