. 2011 Jun 8;6(6):e20797. doi: 10.1371/journal.pone.0020797

Table 2. Regression values and swimming kinematics.

Parameter		Control	Trial 2	Trial 3
Tail beat frequency, f	a (slope)	1.41±0.21^a	2.17±0.17^b	2.11±0.17^b
	b (intercept)	0.31±0.07^a	0.15±0.08^b	0.10±0.05^b
		(r² = 1.00)	(r² = 0.99)	(r² = 1.00)
Wave speed, V	a (slope)	1.01±0.02^a	1.19±0.03^b	1.15±0.02^a
	b (intercept)	0.01±0.01^a	0.02±0.01^a	0.01±0.01^a
		(r² = 1.00)	(r² = 1.00)	(r² = 1.00)
Strouhal (St)		0.31±0.02^a	0.43±0.05^b	0.42±0.05^b

Tail-beat frequency (f) and body wave speed (V) was expressed as a function of swimming speed (U, Body lengths s⁻¹) with the formula f = a+bU. Swim trials without (control) and with a tag (trials 2, 3) were performed on the same individual. Values are mean±SD. Different superscripts indicate significant differences per row (repeated measurements ANOVA, p<0.05, N = 9).