Effects of hypoxia on interval moderate exercise
Journal Title: Biology of Exercise - Year 2008, Vol 4, Issue 0
Abstract
There is a controversy in the published scientific data whether extended training at altitude increases performance at sea level. The effect of hypoxia at rest and on the response to interval moderate exercise was determined in six healthy male individuals during an incremental 3 × 5 min exercise cycle test (5 min recovery) at sea level and in a hypobaric chamber (10000 feet/3100 m altitude). Ventilation rate (VE), breathing frequency (BF), heart rate (HR), cardiac output (Q), blood lactate (Labl) and % of arterial oxygen saturation (SaO2) were measured. Blood samples were drawn at rest and at the end of each exercise bout. Hypoxia led to a significant increase in VE during exercise (81.7 vs. 62, 87 vs. 66, 89 vs. 64 ml/l, for the three exercise bouts, respectively p .05). There was also a significant increase in BF (11.3 vs. 10, 29 vs. 25, 32 vs. 24, 33 vs. 25, p .05), HR (73 vs. 62, 153 vs. 138, 161 vs. 138, 166 vs. 137 b/min, p .05), Q (4.8 vs. 4, 13.1 vs. 12.5, 14.6 vs. 12.2, 15.5 vs. 12.8 l/min, p .05) and Labl (0.41 vs. 0.35, 3.8 vs. 2.6, 4.7 vs 3, 5.9 vs 2.9 mmol/l, p .05) at rest and during exercise. Hypoxia lowered SaO2 at rest and exercise (99.3 vs 98.6, 98.1 vs 95.1, 98.5 vs 95.3, 98.3 vs 95.5%, p .05). The results suggest that there is a hypoxic augmentation of the cardiorespiratory variables measured. Also we concluded that exercise potentiated the acute ventilatory response to hypoxia by increasing VE, breathing frequency, heart rate, cardiac output, blood lactate and decreasing SaO2.
Authors and Affiliations
THANOS ADAMOS| Centre for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, ZISSIS PAPANIKOLAOU| Department of Physical Education and Sports Science, University of Thessaly, VASILEIOS VOUTSELAS| Department of Physical Education and Sports Science, University of Thessaly, DIMITRIOS SOULAS| Department of Physical Education and Sports Science, University of Thessaly
Keywords
Related Articles
- EP ID EP15796
- DOI http:dx.doi.org/10.4127/jbe.2008.4.1-16
- Views 489
- Downloads 23
The attitudes towards and behavior of Greek pupils to nutrition, smoking, stress and physical activity
The aim of this particular study is to evaluate the habits of Greek male and female students, regarding healthy nutrition, physical activity, abstinence from smoking and stress control and to check if there are any dif...
Exercise Intensity Differentially Impacts Sensitivity Thresholds to Specific Tastes
the purpose of this study was to compare the impact of exercise intensity on sensitivity to four major tastes of sweet, sour, salty, and bitter. ten subjects completed two separate 30-min cycling exercise bouts, one a...
Effects of Stabilization Exercises on Muscular Performance in Women with Chronic Low Back Pain
the aim of the study was to examine the relative effectiveness of a 8-week progressive (3 sessions per week) isotonic and isometric rhythmic stabilization exercise program in muscle endurance in women with chronic low b...
Evaluation and Assessment of Leg Muscle Activity and Fatigue Accross two Popular Step Test Exercises
electromyography (emG) provides inside access to physiological and electrical responses during muscular activity. step tests [harvard step Test (hsT) and Queen’s College step Test (QCT)] appear to be simple to admini...
Hamstring Injuries: Prevention and Rehabilitation
Objective: a review was conducted to present current views and effectiveness of prevention and rehabilitation methods of hamstring injuries. Methods: a review searching on the electronic data bases, including proques...