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Table 2 Effect of aging on three-dimensional endplate structures

From: Age-related changes in two- and three-dimensional morphology of type-identified endplates in the rat diaphragm

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
  1. Values are means ± standard deviation
  2. aSignificant difference (P < 0.05) vs. type I
  3. bSignificant difference (P < 0.05) vs. 2-month-old group