Author(s): WALLNER, D., SIMI, H.1, HOLLER, P.1, BURGSTEINER, M.2, HOFMANN, P.3,4, Institution: FH JOANNEUM GESELLSCHAFT MBH, Country: AUSTRIA, Abstract-ID: 1251

INTRODUCTION:
According to the three-phase model, two turn points and three distinct phases of metabolism can be detected in incremental exercise tests [1, 2]. To ensure a high degree of objectivity when determining turn points, computer-assisted analyses are recommended [3, 4].
The aim of the study was to compare turn points detected using the new web-based application turnPoint with those detected using the older computer-assisted analysis standard proSport.
METHODS:
9 women (34.1±19.4 years) and 10 men (37.1±17.0 years) of different training status (VO2max of 45.8±7.5 ml/kg/min and 50.8±11.4 ml/kg/min, respectively) performed an incremental running test on a treadmill (inclination 1.5 %). After 6 minutes warm up at 1.5 m/s for women and 2.0 m/s for men, running speed was increased every minute by 0.2 m/s until exhaustion. Heart rate (HR) was measured continuously, and blood lactate concentration (La) was measured at rest and after each load step. The first (LTP1) and second lactate turn point (LTP2) and the heart rate turn point (HRTP) were determined in both tests according to the method described by Hofmann & Tschakert (2011) using turnPOINT (eSystems GmbH, Austria) and proSport (proJEKT Schlemmer, Austria).
RESULTS:
Running speed at termination of the test was 3.63±0.59 m/s for women and 4.10±0.91 m/s for men. Determined running speeds at LTP1 (2.39±0.42 m/s vs. 2.40±0.42 m/s), LTP2 (3.03±0.65 m/s vs. 3.03±0.65 m/s) and HRTP (3.09±0.71 m/s vs. 3.10±0.71 m/s) showed excellent agreement comparing turnPOINT and proSport (CCC=0.999, CCC=0.999 and CCC=0.999, respectively). Corresponding HR at LTP1, LTP2 and HRTP also showed excellent agreement (CCC=0,999, CCC=0.999 and CCC=0,999, respectively).
CONCLUSION:
An excellent agreement was found comparing the new web-based application turnPOINT and the older computer-assisted analyses standard to determine LTP1, LTP2 and HRTP. Therefore, turnPOINT may be recommended as an objective threshold analysis for incremental running tests. However, the validity of the detected thresholds needs to be proven by standard lactate steady state tests.
[1] Hofmann P. & Tschakert G. (2011) Cardiol Res Pract, 10 pages [2] Fasching P, et al. (2020) J Funct Morphol Kinesiol 5(3), 66 [3] Leitner H, et al. (1992) Österr J Sportmed 22, 115–118 [4] Pokan et al. (2017) Med Sci Sports Exercise 49(5S), 1049