Discrepancies between Skinned Single Muscle Fibres and Whole Thigh Muscle Function Characteristics in Young and Elderly Human Subjects
Table 3
Characteristics of human vastus lateralis single muscle fiber.
Classification
Fiber type
CSA (μm2)
SF (mN/mm2)
Vo (FL/s)
F (mN)
YM
I ()
125.64 ± 73.04
0.50 ± 0.41
IIa ()
4779.22 ± 844.51
131.86 ± 67.16
2.25 ± 1.60
0.52 ± 0.37
I/II hybrid ()
5202.21 ± 731.65
137.70 ± 66.19
2.77 ± 1.46
0.59 ± 0.35
OM
I ()
4503.95 ± 1769.54
123.34 ± 38.79
1.18 ± 0.93
0.45 ± 0.25
IIa ()
3573.14 ± 1943.94
129.28 ± 114.56
1.84 ± 0.67
0.30 ± 0.20
I/II hybrid ()
4962.83 ± 2574.96
138.64 ± 68.53
1.95 ± 1.12
0.59 ± 0.42
YW
I ()
116.99 ± 35.40
0.39 ± 0.16
IIa ()
4436.50 ± 917.72
118.92 ± 75.58
0.99 ± 0.21
0.43 ± 0.28
I/II hybrid ()
4001.50 ± 901.56
122.87 ± 32.76
0.62 ± 0.08
0.38 ± 0.01
OW
I ()
4050.13 ± 1072.37
104.53 ± 41.87
0.97 ± 0.42
0.34 ± 0.19
IIa ()
ND
N/D
N/D
N/D
I/II hybrid ()
4656.80 ± 429.57
129.38 ± 70.47
1.99 ± 1.32
0.50 ± 0.30
One-way repeated analysis of variance followed by the post hoc -test was used for statistical significance. Values are presented as means ± standard deviation. YM = young men, OM = old men, YW = young women, OW = old women, CSA = cross-sectional area, SF = specific force, Vo = maximum shortening velocity, F = maximal contractile force, ND = not detected. : statistical significances between YM type I and YW type I ( for CSA and for CV).
