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  - Mugele, Hendrik
A1  - Plummer, Ashley
A1  - Baritello, Omar
A1  - Towe, Maggie
A1  - Brecht, Pia
A1  - Mayer, Frank
T1  - Accuracy of training recommendations based on a treadmill multistage incremental exercise test
JF  - PLOS ONE
N2  - Competitive runners will occasionally undergo exercise in a laboratory setting to obtain predictive and prescriptive information regarding their performance. The present research aimed to assess whether the physiological demands of lab-based treadmill running (TM) can simulate that of over-ground (OG) running using a commonly used protocol. Fifteen healthy volunteers with a weekly mileage of ≥ 20 km over the past 6 months and treadmill experience participated in this cross-sectional study. Two stepwise incremental tests until volitional exhaustion was performed in a fixed order within one week in an Outpatient Clinic research laboratory and outdoor athletic track. Running velocity (IATspeed), heart rate (IATHR) and lactate concentration at the individual anaerobic threshold (IATbLa) were primary endpoints. Additionally, distance covered (DIST), maximal heart rate (HRmax), maximal blood lactate concentration (bLamax) and rate of perceived exertion (RPE) at IATspeed were analyzed. IATspeed, DIST and HRmax were not statistically significantly different between conditions, whereas bLamax and RPE at IATspeed showed statistical significance (p < 0.05). Apart from RPE at IATspeed, IATspeed, DIST, HRmax and bLamax strongly correlate between conditions (r = 0.815–0.988). High reliability between conditions provides strong evidence to suggest that running on a treadmill are physiologically comparable to that of OG and that training recommendations and be made with assurance.
KW  - individual anaerobic threshold
KW  - lactate threshold
KW  - soccer players
KW  - performance
KW  - validity
KW  - reliability
KW  - runners
Y1  - 2018
U6  - https://doi.org/10.1371/journal.pone.0204696
SN  - 1932-6203
VL  - 13
IS  - 10
SP  - 1
EP  - 12
PB  - PLOS
CY  - San Francisco
ER  -