TY - JOUR A1 - Scharhag-Rosenberger, Friederike A1 - Wochatz, Monique A1 - Otto, Christoph A1 - Cassel, Michael A1 - Mayer, Frank A1 - Scharhag, Jürgen T1 - Blood lactate concentrations are mildly affected by mobile gas exchange measurements JF - International journal of sports medicine N2 - We sought to investigate the effects of wearing a mobile respiratory gas analysis system during a treadmill test on blood lactate (bLa) concentrations and commonly applied bLa thresholds. A total of 16 recreational athletes (31 +/- 3 years, V0205: 58 6 ml min(-1)-kg(-1)) performed one multistage treadmill test with and one without gas exchange measurements (GEM and noGEM). The whole bLa curve, the lactate threshold (LT), the individual anaerobic thresholds according to Stegmann(IAT(sr)) and Dickhuth (IAT(Di)), and a fixed bLa concentration of 4 mmob.l(-1) (OBLA) were evaluated. The bLa curve was shifted slightly leftward in GEM compared to noGEM (P<0.05), whereas the heart rate response was not different between conditions (P= 0.89). There was no difference between GEM and noGEM for LT (2.61 +/- 0.34 vs. 2.64 +/- 0.39 m(-1) s(-1) P=0.49) and IAT(st) (3.47 +/- 0.42 vs. 3.55 +/- 0.47m-s(-1), P=0.12). However, IATD(Di) (3.57 +/- 0.39 vs. 3.66 +/- 0.44m-s(-1), P<0.01) and OBLA (3.85 +/- 0.46 vs. 3.96 +/- 0.47m-s-1, P<0.01) occurred at slower running velocities in GEM. The bLa response to treadmill tests is mildly affected by wearing a mobile gas analysis system. This also applies to bLa thresholds located at higher exercise intensities. While the magnitude of the effects is of little importance for recreational athletes, it might be relevant for elite athletes and scientific studies. KW - cardiopulmonary exercise testing KW - performance diagnostics KW - lactate threshold KW - VO2mdx KW - metabolic device Y1 - 2014 U6 - https://doi.org/10.1055/s-0033-1354386 SN - 0172-4622 SN - 1439-3964 VL - 35 IS - 7 SP - 590 EP - 594 PB - Thieme CY - Stuttgart ER - TY - JOUR A1 - Koch, Sarah A1 - Cassel, Michael A1 - Linne, Karsten A1 - Mayer, Frank A1 - Scharhag, Jürgen T1 - ECG and echocardiographic findings in 10-15-year-old elite athletes JF - European journal of preventive cardiology : the official ESC journal for primary & secondary cardiovascular prevention, rehabilitation and sports cardiology N2 - Background: Data on electrocardiographic and echocardiographic pre-participation screening findings in paediatric athletes are limited. KW - ECG KW - echocardiography KW - paediatric athlete KW - pre-participation screening KW - sudden cardiac death Y1 - 2014 U6 - https://doi.org/10.1177/2047487312462147 SN - 2047-4873 SN - 2047-4881 VL - 21 IS - 6 SP - 774 EP - 781 PB - Sage Publ. CY - London ER - TY - JOUR A1 - Scharhag-Rosenberger, Friederike A1 - Carlsohn, Anja A1 - Lundby, Carsten A1 - Schueler, Stefan A1 - Mayer, Frank A1 - Scharhag, Jürgen T1 - Can more than one incremental cycling test be performed within one day? JF - European journal of sport science : official journal of the European College of Sport Science N2 - Changes in performance parameters over four consecutive maximal incremental cycling tests were investigated to determine how many tests can be performed within one single day without negatively affecting performance. Sixteen male and female subjects (eight trained (T): 25 +/- 3 yr, BMI 22.6 +/- 2.5 kg center dot m(-2), maximal power output (P-max) 4.6 +/- 0.5 W center dot kg(-1); eight untrained (UT): 27 +/- 3 yr, BMI 22.3 +/- 1.2 kg center dot m(-2), P-max 2.9 +/- 0.3 W center dot kg(-1)) performed four successive maximal incremental cycling tests separated by 1.5 h of passive rest. Individual energy requirements were covered by standardised meals between trials. Maximal oxygen uptake (VO2max) remained unchanged over the four tests in both groups (P = 0.20 and P = 0.33, respectively). P-max did not change in the T group (P = 0.32), but decreased from the third test in the UT group (P < 0.01). Heart rate responses to submaximal exercise were elevated from the third test in the T group and from the second test in the UT group (P < 0.05). The increase in blood lactate shifted rightward over the four tests in both groups (P < 0.001 and P < 0.01, respectively). Exercise-induced net increases in epinephrine and norepinephrine were not different between the tests in either group (P 0.15). If VO2max is the main parameter of interest, trained and untrained individuals can perform at least four maximal incremental cycling tests per day. However, because other parameters changed after the first and second test, respectively, no more than one test per day should be performed if parameters other than VO2max are the prime focus. KW - Maximal oxygen uptake KW - cardiopulmonary exercise testing KW - consecutive tests KW - study design KW - exhaustion KW - fatigue Y1 - 2014 U6 - https://doi.org/10.1080/17461391.2013.853208 SN - 1746-1391 SN - 1536-7290 VL - 14 IS - 5 SP - 459 EP - 467 PB - Routledge, Taylor & Francis Group CY - Abingdon ER -