VO₂ Kinetics and Metabolic Contributions Whilst Swimming at 95, 100, and 105% of the Velocity at VO_2max

Table 2

Mean ± SD values for the VO₂ kinetics responses during at the time to exhaustion tests (𝑛=12).

VO2 kinetics parameters	95% of vVO2max	100% of vVO2max	105% of vVO2max
𝐴0 (mL·min^−1)	1214.71 ± 351.79	1358.53 ± 368.71	1389.55 ± 257.32
𝐴1 (mL·min^−1)	2568.31 ± 384.22	2402.64 ± 327.82	2628.24 ± 410.31
TD1 (s)	11.28 ± 3.98	8.60 ± 2.49	8.05 ± 3.49
𝜏1 (s)	14.82 ± 4.01	18.06 ± 3.07	16.37 ± 3.81
95% confidence intervals (s)	(12.3–17.4)	(16.1–20.1)	(13.9–18.8)
DefO2 (L)	0.60 ± 0.12	0.77 ± 0.24	0.74 ± 0.19
Gain (mL·m^−1)	32.07 ± 4.54	29.39 ± 4.72	29.84 ± 4.43
𝐴2 (mL·min^−1)	480.76 ± 247.01^b	452.18 ± 217.04^b	147.07 ± 60.40
TD2 (s)	106.29 ± 28.67^a,b	59.99 ± 12.50	69.07 ± 5.70
𝜏2 (s)	120.23 ± 31.77^b	121.12 ± 31.71^b	61.46 ± 27.29
% 𝐴2	15.81 ± 7.87^b	16.36 ± 6.04^b	5.32 ± 1.99

𝐴₀ = VO₂ just before the beginning of exercise; 𝐴₁, TD₁, 𝜏₁, DefO₂, and Gain = fast component amplitude, time delay, time constant, O₂ deficit and gain, respectively; 𝐴₂, TD₂, 𝜏₂, and % 𝐴₂ = slow component amplitude, time delay, time constant, and relative contribution of slow component in relation to the end exercise VO₂ of that bout, respectively. Differences between intensities are identified by a and b (100 and 105% of vVO_2max) (𝑃≤0.05).