Abstract
Background and Study Aim. The purpose of this study was to examine the effect of volleyball training on the development of exercise-induced arterial hypoxemia during incremental exercise in male competitive volleyball players.
 Material and Methods. Eight male amateur volleyball players (age 21±1.3 years) participated in a 6-week volleyball training program three times a week in the pre-season preparatory period. Before and after the training period, all players performed an incremental treadmill test to determine maximal oxygen uptake (VO2max), and oxyhemoglobin saturation (SaO2) was continuously measured using a pulse oximeter during the test. Maximal values of minute ventilation (VEmax), respiratory exchange ratio (RERmax), ventilatory equivalent for oxygen (VE/VO2) and carbon dioxide (VE/VCO2) were determined. Exercise-induced arterial hypoxemia (EIAH) was defined as a SaO2 decreased by at least 4% (ΔSaO2≤ −4%) from resting level.
 Results. All the players exhibited exercise-induced arterial hypoxemia before (ΔSaO2= –8.8±3.3%) and after (ΔSaO2= –8.31.5%) the training period. SaO2 was significantly decreased from 97.6±1% at rest to 88.7±2.7% at exhaustion before the training period, and from 97.2±1.1% at rest to 88.8±2.1% at exhaustion after training period (p < 0.001). There was no significant difference in resting and lowest SaO2 values by comparison between the before and after training (p > 0.05). There were no significant changes in VO2max, VEmax, RERmax, VE/VO2 and VE/VCO2 after training period (p > 0.05).
 Conclusions. The results of this study showed that volleyball players with a history of anaerobic training may exhibit EIAH, but that 6-week volleyball training has no effect on the degree of exercise-induced arterial hypoxemia.
Highlights
Material: Results: Conclusions: Keywords: Eight male amateur volleyball players participated in a 6-week volleyball training program three times a week in the pre-season preparatory period
The results of this study showed that volleyball players with a history of anaerobic training may exhibit Exercise-induced arterial hypoxemia (EIAH), but that 6-week volleyball training has no effect on the degree of exercise-induced arterial hypoxemia. desaturation, pulse oximetry, oxyhemoglobin saturation, team sports athletes
Studies investigating EIAH mostly focused on endurance athletes and reported that EIAH is more common in athletes with high aerobic capacity [2, 3, 10, 11]
Summary
Material: Results: Conclusions: Keywords: Eight male amateur volleyball players (age 21±1.3 years) participated in a 6-week volleyball training program three times a week in the pre-season preparatory period. Before and after the training period, all players performed an incremental treadmill test to determine maximal oxygen uptake (VO2max), and oxyhemoglobin saturation (SaO2) was continuously measured using a pulse oximeter during the test. Many athletes have been shown to experience exercise induced arterial hypoxemia in a normoxic environment [3, 4]. This negative finding accompanied by decreased partial pressure of oxygen in arterial blood may contribute to local muscle fatigue [5]. It has been shown that when the fraction of inspired oxygen increased during exercise, the decrease in oxyhemoglobin saturation (SaO2) prevented, the endurance time to exhaustion and VO2max increased [6, 7]. We and others have recently demonstrated that EIAH can occur in anaerobic trained athletes and nonendurance sportsmen (relatively low VO2max) [13, 14]
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