|
3-D
|
Age (month)
|
Muscle fiber type
|
|---|
|
I
|
IIa
|
IIx/IIb
|
|---|
|
Endplate volume (μm3)
|
2
|
1,610 ± 633
|
2,044 ± 653
|
2,877 ± 1,097
|
|
10
|
2,503 ± 1,251
|
3,289 ± 1,640
|
4,961 ± 1,348
|
|
24
|
2,793 ± 1,252
|
3,843 ± 2,071
|
6,217 ± 2,813
|
|
30
|
1,892 ± 938
|
2,974 ± 1,778
|
5,054 ± 1,938a,b
|
|
Endplate surface area (μm2)
|
2
|
1,619 ± 507
|
2,137 ± 617
|
2,617 ± 835
|
|
10
|
2,432 ± 887
|
3,069 ± 1,208
|
4,742 ± 1,758
|
|
24
|
2,757 ± 1,046
|
3,836 ± 1,683
|
5,863 ± 2,280
|
|
30
|
2,231 ± 770
|
3,675 ± 1,726
|
5,983 ± 1,984a,b
|
|
Endplate thickness (μm)
|
2
|
6.8 ± 2.1
|
6.5 ± 2.1
|
7.5 ± 2.4
|
|
10
|
6.6 ± 3.2
|
6.6 ± 2.8
|
6.3 ± 2.7
|
|
24
|
8.5 ± 2.8
|
8.4 ± 3.3
|
8.4 ± 2.8
|
|
30
|
6.7 ± 2.7
|
6.9 ± 2.9
|
6.5 ± 2.3
|
- Values are means ± standard deviation
- aSignificant difference (P < 0.05) vs. type I
- bSignificant difference (P < 0.05) vs. 2-month-old group
