Table 4.

Summary of Mann–Whitney U test for taxonomic analysis of relative abundance of four main bacterial phyla.

Phylum	Fatigued	Nonfatigued	Mann–Whitney U
	Median	Median	U	p value
Firmicutes/Bacteroidetes
Middle	0.74	0.32	50	0.08
End	0.22	1.33	79	0.07
Actinobacteria
Middle	0.002	0.002	78	0.76
End	0.0008	0.0009	61	0.57
Bacteroidetes
Middle	0.22	0.72	124	0.04∗
End	0.65	0.41	16	0.009∗∗
Firmicutes
Middle	0.23	0.23	71	0.51
End	0.14	0.51	78	0.08
Proteobacteria
Middle	0.13	0.05	61	0.24
End	0.09	0.23	54	0.94

^∗ p ≤ 0.05 and ^∗∗p ≤ 0.01 middle of treatment (fatigued n = 13; nonfatigued n = 13); end of treatment (fatigued n = 15; nonfatigued n = 7).