Table 1.

Microstructural properties analysed in M. semitendinosus from focus pigs for the three distance categories (lsmeans ± SE, n = 12).

Property	long distance	medium distance	short distance	F	P
TFN (thousands)	953 ± 34	880 ± 34	895 ± 34	1.27	0.332
Capillaries/fibre	0.32 ± 0.06	0.43 ± 0.06	0.30 ± 0.06	1.46	0.287
Fibre area/capillary (µm²)	11,769 ± 1,491	9,890 ± 1,495	13,571 ± 1,483	1.52	0.275
FCSA (µm²)
STO	4,049 ± 448	4,384 ± 449	4,887 ± 446	0.90	0.446
FTO	3,222 ± 337	4,036 ± 338	3,696 ± 336	1.45	0.291
FTG	3,468 ± 212	3,553 ± 213	3,627 ± 211	0.14	0.870
Pathologic	2,605 ± 609	1,678 ± 684	1,435 ± 706	0.88	0.464
Average	3,456 ± 269	3,847 ± 270	3,864 ± 268	0.73	0.511
Relative fibre number (%)
STO	20.1 ± 2.6	22.2 ± 2.6	17.2 ± 2.6	0.90	0.443
FTO	28.1 ± 1.4	28.7 ± 1.4	29.5 ± 1.4	0.25	0.784
FTG	49.7 ± 1.8	47.9 ± 1.8	52.4 ± 1.8	1.53	0.273
Pathologic	2.2 ± 0.7	1.2 ± 0.7	0.9 ± 0.7	1.05	0.395

TFN – total fibre number; FCSA – fibre cross-sectional area; STO – slow twitch oxidative; FTO – fast twitch oxidative; FTG – fast twitch glycolytic.