Fig. 2

a Observed lactate concentrations in red blood cells (solid lines with solid symbols) and in plasma (dashed lines with hollow symbols), given in mean ± standard deviation, under the three different warm-up conditions (k = 1, 2, 3), where the unit of lactate concentration is millimole per liter, denoted by mmol l⁻¹. b Observed lactate concentration ratio between red blood cells and plasma as functions of time, also given in mean ± standard deviation, for k = 1, 2, 3. k = 1, Moderate warm-up; k = 2, intensive warm-up; k = 3, without warm-up