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. 2017 Mar 21;11(9):1558–1566. doi: 10.1017/S1751731117000556

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© The Animal Consortium 2017

This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.

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(a) Heart rate, (b) hematocrit, (c) plasma lactate concentration and (d) breathing frequency (least square means±root mean standard error) after five phases (each 642 m in tölt) in an incremental exercise test in eight Icelandic horses where the BW ratio between rider and horse started at 20% (BWR₂₀), was increased to 25% (BWR₂₅), 30% (BWR₃₀) and 35% (BWR₃₅), and then decreased to 20% (BWR_20b). Blood samples were collected and breathing frequency counted at end of each of the five phases. Heart rate was recorded during the last minute of each phase. ^a,b,c,dSignificantly different mean value (P<0.05).