The Reproducibility of 4-km Time Trial (TT) Performance Following Individualised Sodium Bicarbonate Supplementation: a Randomised Controlled Trial in Trained Cyclists

Sports Medicine - Open

Table 1 Overview of intraclass correlation coefficients (ICC) and typical error (TE) statistical analysis following sodium bicarbonate (NaHCO₃) treatments (SBC2 and SBC3) on pre-, during and post-exercise blood pH, bicarbonate (HCO₃ ⁻) and lactate

Absolute change from baseline to peak (including initial TTP trial)
HCO₃ ⁻	SBC2	SBC3	pH	SBC2	SBC3
ICC			ICC
r value	0.79	0.69	r value	0.79	0.17
p value	< 0.001	0.006	p value	< 0.001	0.326
Typical error %	1.2	1.4	Typical error %	1.4	1.7
Interpretation	Excellent	Good	Interpretation	Excellent	Poor
During exercise
Decline in HCO₃ ⁻	SBC2	SBC3
ICC
r value	0.69	0.95
p value	0.026	< 0.001
Typical error %	1.3	0.6
Interpretation	Good	Excellent
Post-exercise
Blood lactate	SBC2	SBC3	HCO₃ ⁻	SBC2	SBC3	pH	SBC2	SBC3
ICC			ICC			ICC
r value	0.91	0.92	r value	0.89	0.95	r value	0.92	0.95
p value	< 0.001	< 0.001	p value	< 0.001	< 0.001	p value	< 0.001	< 0.001
Typical error %	0.7	0.8	Typical error %	0.8	0.6	Typical error %	0.6	0.6
Interpretation	Excellent	Excellent	Interpretation	Excellent	Excellent	Interpretation	Excellent	Excellent