Changes in blood lactate and respiratory gas exchange measures in sports with discontinuous load profiles |
| |
| Authors: | Gerhard?Smekal author-information" > author-information__contact u-icon-before" > mailto:Gerhard.Smekal@univie.ac.at" title=" Gerhard.Smekal@univie.ac.at" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Serge?P.?von?Duvillard,Rochus?Pokan,Harald?Tschan,Ramon?Baron,Peter?Hofmann,Manfred?Wonisch,Norbert?Bachl |
| |
| Affiliation: | (1) Institute of Sports Sciences, Department of Sport Physiology, University Vienna, Auf der Schmelz 6, 1150, Vienna, Austria,;(2) Human Performance Laboratory, Department of Kinesiology and Health Promotion, California State Polytechnic University-Pomona, California, USA,;(3) Institute of Sport Sciences, University of Graz, Austria, |
| |
| Abstract: | This study compares two different sport events (orienteering = OTC; tennis = TEC) with discontinuous load profiles and different activity/recovery patterns by means of blood lactate (LA), heart rate (HR), and respiratory gas exchange measures (RGME) determined via a portable respiratory system. During the TEC, 20 tennis-ranked male subjects [age: 26.0 (3.7) years; height: 181.0 (5.7) cm; weight: 73.2 (6.8) kg; maximal oxygen consumption (V˙O2max): 57.3 (5.1) ml·kg−1·min−1] played ten matches of 50 min. During the OTC, 11 male members of the Austrian National Team [age: 23.5 (3.9) years; height: 183.6 (6.8) cm; weight: 72.4 (3.9) kg; V˙O2max: 67.9 (3.8) ml·kg−1·min−1] performed a simulated OTC (six sections; average length: 10.090 m). In both studies data from the maximal treadmill tests (TT) were used as reference values for the comparison of energy expenditure of OTC and TEC. During TEC, the average V˙O2 was considerably lower [29.1 (5.6) ml·kg−1·min−1] or 51.1 (10.9)% of VO2max and 64.8.0 (13.3)% of V˙O2 determined at the individual anaerobic threshold (IAT) on the TT. The short high-intensity periods (activity/recovery = 1/6) did not result in higher LA levels [average LA of games: 2.07 (0.9) mmol·l−1]. The highest average V˙O2 value for a whole game was 47.8 ml·kg−1·min−1 and may provide a reference for energy demands required to sustain high-intensity periods of tennis predominately via aerobic mechanism of energy delivery. During OTC, we found an average V˙O2 of 56.4 (4.5) ml·kg−1·min−1 or 83.0 (3.8)% of V˙O2max and 94.6 (5.2)% of V˙O2 at IAT. In contrast to TEC, LA were relatively high [5.16 (1.5) mmol·l−1) although the average V˙O2 was significantly lower than V˙O2 at IAT. Our data suggest that portable RGEM provides valuable information concerning the energy expenditure in sports that cannot be interpreted from LA or HR measures alone. Portable RGEM systems provide valuable assessment of under- or over-estimation of requirements of sports and assist in the optimization and interpretation of training in athletes. Electronic Publication |
| |
| Keywords: | Lactate Orienteering Oxygen uptake Portable spirometry Tennis |
| 本文献已被 PubMed SpringerLink 等数据库收录！ |
|
