Regression values and swimming energetic parameters.

<p>Oxygen consumption (MO₂, mgO₂ kg⁻¹ h⁻¹) was expressed as a function of swimming speed (<i>U</i>, Body lengths s⁻¹) with the formula <i>f</i> = ab<i>U</i>^b+SMR. Swim trials without (control) and with a tag (trials 2, 3) were performed on the same individual. Abbreviations: SMR, standard metabolic rate; AMR, active metabolic rate; <i>U</i>_opt, optimal swimming speed; COT_min, minimum cost of transport; <i>U</i>_crit, critical swimming speed. Values are mean±SD. Different superscripts indicate significant differences per row (repeated measurements ANOVA, p<0.05, <i>N</i> = 9).