Table 2.

Concentration of lactic acid (LA) of the participants’ blood samples.

Variable	Younger group (n = 38)	Older group (n = 38)	pMW1
LA (mmol/L)
pF2	<0.001	<0.001
Pre-test	3.0 (2.7–3.4)aaaa	3.1 (2.8–3.3)aaaa	0.897
Post-test	9.9 (8.3–11.3)bbbb	10.0 (9.1–11.5)bbbb	0.899
LA-rec	2.7 (2.5–3.1)	2.7 (2.4–3.1)	0.526
Corrected LA (mmol/L)
pF	<0.001	<0.001
Pre-test	3.0 (2.7–3.4)aaaa	3.1 (2.8–3.3)aaaa	0.897
Post-test	10.0 (8.1–11.1)bbbb	9.8 (8.8–10.7)bbbb	0.727
LA-rec	2.7 (2.5–3.2)	2.8 (2.4–3.3)	0.553

¹Differences observed between analyzed age groups (younger vs. older group) were assessed using the Mann–Whitney U-test.

²Significance levels of differences observed between analyzed time points (pre-test vs. post-test vs. LA-rec) were assessed using Friedman’s analysis of variance for repeated measures (pF—Friedman’s ANOVA p values) followed by post-hoc Dunn’s test with Bonferroni correction. The table presents median (Q1–Q3) values. The analyses were performed before (baseline, pre-test) and after the effort (5-15 min post-effort and during lactate recovery time about 1 h after the test).

Post-hoc p values:

^aaaap < 0.0001, for pre-test vs. post-test;

^bbbbp < 0.0001, for post-test vs. LA-rec.