Table 4

Intramuscular Adaptations and MHC mRNA Expression

Marker
AA (n = 15)
PLA (n = 16)
Significance

Total protein (μg·g-1)


Group: 0.92
     Day 0
7.5 ± 4.5
6.6 ± 3.8
Time: 0.28
     Day 50
7.0 ± 4.5
8.2 ± 4.3a,b
G × T: 0.05
FP receptor (INT·mm2·mg-1)


Group: 0.63
     Day 0
1,929 ± 1,395
2,253 ± 1,309
Time: 0.13
     Day 50
2,425 ± 1,746
2,518 ± 992
G × T: 0.64
EP3 receptor (INT·mm2·mg-1)


Group: 0.55
     Day 0
5,990 ± 3,563
6,854 ± 3,287
Time: 0.11
     Day 50
7,149 ± 3,383
7,529 ± 2,791
G × T: 0.66
MHC I protein (ng·ml-1)


Group: 0.78
     Day 0
187.8 ± 180.7
172.8 ± 123.0
Time: 0.64
     Day 50
176.3 ± 104.4
164.3 ± 126.6
G × T: 0.96
MHC IIa protein (ng·ml-1)


Group: 0.84
     Day 0
184.4 ± 217.1
156.9 ± 84.5
Time: 0.009
     Day 50
305.0 ± 366.3
295.8 ± 328.5
G × T: 0.84
MHC IIx protein (ng·ml-1)


Group: 0.55
     Day 0
128.7 ± 79.1
133.6 ± 83.5
Time: 0.23
     Day 50
103.9 ± 68.2
131.9 ± 81.7
G × T: 0.29
MHC I mRNA


Group: 0.45
     Day 0
0.69 ± 0.16
0.68 ± 0.14
Time: 0.70
     Day 50
0.64 ± 0.07
0.71 ± 0.15
G × T: 0.14
MHC IIa mRNA


Group: 0.32
     Day 0
0.66 ± 0.12
0.66 ± 0.14
Time: 0.55
     Day 50
0.63 ± 0.07
0.71 ± 0.13
G × T: 0.08
MHC IIx mRNA


Group: 0.42
     Day 0
0.66 ± 0.14
0.65 ± 0.15
Time: 0.98
     Day 50
0.62 ± 0.07
0.69 ± 0.14
G × T: 0.10

Values are expressed as means ± SD.

AA: Arachidonic acid, PLA: placebo, INT: integrated density units, MHC: myosin heavy chain.

aSignificant within-group difference from baseline values, p < 0.05.

bSignificant group × time (G × T) interaction, p < 0.05

Roberts et al. Journal of the International Society of Sports Nutrition 2007 4:21   doi:10.1186/1550-2783-4-21