2c.

Serum concentrations of L- and D-BAIBA in different gender populations

Aminobutyric acids	Measurements	Physical performance	Gender
			Female	Male	p-value
D-BAIBA (μM)	All participants in each group	All	1.55 ± 0.76 (60)	1.52 ± 0.78 (60)	0.8306
		High (HP)	1.58 ± 0.70 (20)	1.72 ± 1.14 (20)	0.6427
		Average (AP)	1.51 ± 0.71 (20)	1.40 ± 0.51 (20)	0.5449
		Low (LP)	1.55 ± 0.88 (20)	1.44 ± 0.53 (20)	0.6291
L-BAIBA (μM)	All participants in each group1	All	0.037 ± 0.064 (60)	0.048 ± 0.064 (60)	0.3348
		High (HP)	0.036 ± 0.031 (20)	0.033 ± 0.030 (20)	0.8138
		Average (AP)	0.036 ± 0.092 (20)	0.072 ± 0.098 (20)	0.2421
		Low (LP)	0.040 ± 0.024 (20)	0.039 ± 0.035 (20)	0.8848

Each data represents mean ± SD (n). ANOVA was applied for statistics analysis. *p<0.05.

For the participants with L-BAIBA undetectable in their serum samples, the L-BAIBA levels are counted as “0”.