Table 4.

Metabolites differentially abundant in non-oxygen exposed (NOE) and oxygen exposed (OE) surfaces¹ of the longissimus lumborum during days 0 and 6 of display

Functional role	Metabolite	FDR	P-value	NOE2		OE		Day 6
				Day 0	Day 6	Day 0	Day 6	NOE	OE
Pentose and glucuronate interconversions	Xylulose	0.01	0	Down	Up	Down	Up	NS
	Xylitol	0.04	0.001	Down	Up	NS		Up	Down
Pentose phosphate pathway	Gluconic acid	0.04	0.001	Down	Up	Down	Up	Down	Up
Fatty acid metabolism	Stearic acid	0.05	0.003	Up	Down	Up	Down	NS
	Saccharic acid	0.1	0.012	Up	Down	Up	Down	NS
	Arachidic acid	0.16	0.03	Up	Down	Up	Down	Up	Down
	Hexadecylglycerol	0.1	0.013	Up	Down	Up	Down	NS
	1-Monopalmitin	0.09	0.007	Up	Down	Up	Down	NS
	Glycerol	0.07	0.004	Up	Down	Up	Down	NS
TCA cycle	Citric acid	0.04	0.001	Down	Up	Down	Up	Down	Up
	Aconitic acid	0.09	0.007	Down	Up	Down	Up	NS
	Succinic acid	0.15	0.027	Up	Down	Up	Down	NS
Amino acid metabolism
	Methionine sulfoxide	0.15	0.025	Down	Up	Down	Up	NS
	Serine	0.15	0.027	Down	Up	Down	Up	NS
	Tyrosine	0.16	0.034	Down	Up	Down	Up	NS
Sugar metabolism	Ribose	0.13	0.018	Down	Up	Down	Up	NS
	Ribonic acid	0.14	0.022	Down	Up	Down	Up	Down	Up
Ascorbate metabolism	Isothreonic acid	0.05	0.003	Down	Up	Down	Up	Up	Down
Steroid hormone biosynthesis	Cholesterol	0.05	0.003	Up	Down	Up	Down	NS
Oxidative phosphorylation	Creatinine	0.07	0.005	Up	Down	Up	Down	Up	Down
Purine metabolism	Hypoxanthine	0.09	0.008	Down	Up	Down	Up	NS
Pyrazine metabolism	2,5-Dihydroxypyrazine	0.09	0.009	Up	Down	Up	Down	Up	Down
Collagen metabolism	Glycylproline	0.1	0.01	Down	Up	Down	Up	NS
Antioxidant	Alpha-tocopherol	0.1	0.012	NS		Up	Down	Up	Down
Neurotransmitter	4-Hydroxybutyric acid	0.1	0.012	NS		Up	Down	Up	Down
Propionate metabolism	Propylene glycol	0.14	0.021	Up	Down	Up	Down	Up	Down
Glyoxylate and dicarboxylate metabolism	Glycolic acid	0.16	0.033	NS		Up	Down	Up	Down

¹Exposure of muscle to oxygen as display surface indicated as oxygen exposed (OE) or interior of the muscle as non-oxygen exposed (NOE).

²Represents comparison between NOE days 0 and 6; NOE day 6 and OE day 6, and NOE day 0 and OE day 6.