caa a22 4500 469055472 CHVBK 20180323132842.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00636217 doi (NATIONALLICENCE)springer-10.1007/BF00636217 Comparison of mathematically determined blood lactate and heart rate "threshold” points and relationship with performance [Elektronische Daten] [Savvas Tokmakidis, Luc Léger] Summary: The purpose of this study was to investigate the relationship between threshold points for heart rate ( $${\text{TH}}_{f_c } $$ ) and blood lactate (Th1a) as determined by two objective mathematical models. The models used were the mono-segmental exponential (EXP) model of Hughson et al. and the log-log (LOG) model of Beaver et al. Inter-correlations of these threshold points and correlations with performance were also studied. Seventeen elite runners (mean, SD = 27.5, 6.5 years; 1.73, 0.05 m; 63.8, 7.3 kg; and maximum oxygen consumption of 67.8, 3.7 ml · kg−1 · min−1) performed two maximal multistage running field tests on a 183.9-m indoor track with inclined turns. The initial speed of 9 km · h−1 (2.5 m · s−1) was increased by 0.5 km · h−1 (0.14 m · s−1) every lap for thef c test and by 1 km · h−1 (0.28 m · s−1) every 4 min for the la test. After fitting the la or thef c data to the two mathematical models, the threshold speed was assessed in the LOG model from the intersection of the two linear segments (LOG-1a; LOG-f c) and in the EXP model from a tangent point (TI-1a; TI-f c). Th1a and $${\text{TH}}_{f_c } $$ speeds computed with the two models were significantly different (P<0.001) and poorly correlated (LOG-1a vs LOG-f c:r=0.36, TI-1a vs TI-f c:r=0.13). In general, $${\text{TH}}_{f_c } $$ were less well correlated with performance than Th1a. With two different objective mathematical models, this study has shown significant differences and poor correlations between Th1a and $${\text{TH}}_{f_c } $$ . Thus thef c inflection point with Conconi's protocol is a poor indicator of the la breakpoint with a conventional multistage protocol and a weaker indicator of running performance. Springer-Verlag, 1992 Lactate nationallicence Heart rate nationallicence Anaerobic threshold nationallicence Mathematical model nationallicence Conconi test nationallicence Tokmakidis Savvas Department of Physical Education, University of Montreal, H3C 3J7, Montreal, Canada aut Léger Luc Department of Physical Education, University of Montreal, H3C 3J7, Montreal, Canada aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 309-317 0301-5548 64:4<309 1992 64 421 https://doi.org/10.1007/BF00636217 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00636217 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tokmakidis Savvas Department of Physical Education, University of Montreal, H3C 3J7, Montreal, Canada aut NATIONALLICENCE 700 1- Léger Luc Department of Physical Education, University of Montreal, H3C 3J7, Montreal, Canada aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 309-317 0301-5548 64:4<309 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer