Table 2.

Intramyocellular sphingolipid concentrations during the postprandial protocol

	Postprandial Period
	1.5 h	6.5 h	P Value
SS fraction, pmol/mg protein
Sphingosine	0.85 (0.58–1.25)	0.83 (0.65–1.18)	0.994
Sphinganine	0.81 ± 0.42	0.81 ± 0.54	0.993
Total Cer	73.8 ± 28.0	80.1 ± 26.0	0.262
C14:0 Cer	0.27 ± 0.12	0.25 ± 0.12	0.202
C16:0 Cer	9.5 ± 5.2	8.0 ± 2.8	0.062
C18:1 Cer	5.3 (4.0–7.2)	4.9 (3.4–6.7)	0.056
C18:0 Cer	35.0 ± 12.0	30.8 ± 10.5	0.035
C20:0 Cer	0.99 ± 0.27	0.96 ± 0.41	0.608
C24:1 Cer	4.2 ± 3.5	7.5 ± 5.3	0.0016
C24:0 Cer	17.0 ± 12.8	27.5 ± 12.7	0.0016
IMF fraction, pmol/mg protein
Sphingosine	0.69 (0.51–1.03)	0.74 (0.47–1.57)	0.592
Sphinganine	0.71 ± 0.42	0.73 ± 0.43	0.735
Total Cer	44.8 (37.0–54.9)	46.1 (35.6–55.9)	0.483
C14:0 Cer	0.31 ± 0.15	0.34 ± 0.24	0.233
C16:0 Cer	5.5 ± 2.0	5.8 ± 3.1	0.414
C18:1 Cer	5.5 (4.3–7.6)	5.4 (3.9–8.0)	0.922
C18:0 Cer	18.7 ± 8.7	19.1 ± 9.4	0.769
C20:0 Cer	0.10 (0.07–0.24)	0.09 (0.07–0.21)	0.492
C24:1 Cer	1.8 (1.4–2.5)	1.7 (1.4–2.4)	0.115
C24:0 Cer	14.0 (9.8–15.4)	13.0 (10.1–17.9)	0.053

Data are shown as means ± SD or median (interquartile range). Analyzed by paired t-test or Wilcoxon signed rank test. SS, subsarcolemmal; IMF, intramyofibrillar; Cer, ceramide.