| |
Adult
|
Aged
|
|---|
|
Ctl (n = 7)
|
DFO (n = 7)
|
Ctl (n = 6)
|
DFO (n = 6)
|
|---|
|
Twitch Force (N) A
|
4.36 ± 0.32
|
5.53 ± 0.38
|
3.78 ± 0.40
|
4.04 ± 0.35
|
|
Tetanic Force (N) A, D
|
12.76 ± 0.44
|
14.87 ± 0.88
|
10.02 ± 0.86
|
11.65 ± 0.79
|
|
Twitch Muscle Quality (N/cm2)
|
5.01 ± 0.26
|
6.42 ± 0.51
|
5.35 ± 0.49
|
5.30 ± 0.40
|
|
Tetanic Muscle Quality (N/cm2) D
|
14.68 ± 0.47
|
17.25 ± 1.14
|
13.82 ± 0.60
|
15.28 ± 0.76
|
|
Muscle Mass (g) A
|
1.33 ± 0.05
|
1.35 ± 0.05
|
1.15 ± 0.07
|
1.19 ± 0.04
|
|
Muscle CSA (cm2) A
|
0.87 ± 0.03
|
0.87 ± 0.03
|
0.71 ± 0.04
|
0.76 ± 0.03
|
|
TPT (ms)
|
31.8 ± 1.7
|
35.6 ± 2.5
|
35.5 ± 2.8
|
30.8 ± 1.3
|
|
1/2 RT (ms) X
|
24.3 ± 2.1a
|
30.3 ± 3.5
|
40.3 ± 9.6
|
21.0 ± 0.8a
|
|
RFD (mN/ms)
|
311.7 ± 26.4
|
340.4 ± 70.9
|
252.0 ± 27.9
|
327.8 ± 30.8
|
|
RFR (mN/ms) A
|
271.3 ± 19.1
|
270.2 ± 31.5
|
149.1 ± 37.2
|
236.9 ± 9.2
|
|
norm RFD (%/ms)
|
2.5 ± 0.2
|
2.3 ± 0.2
|
2.7 ± 0.3
|
2.9 ± 0.4
|
|
norm RFR (%/ms) X
|
2.2 ± 0.2a
|
1.8 ± 0.1
|
1.5 ± 0.2
|
2.0 ± 0.2
|
|
Twitch:Tetanus
|
0.34 ± 0.01
|
0.37 ± 0.04
|
0.39 ± 0.03
|
0.34 ± 0.02
|
|
lopt (mm) A, X
|
32.5 ± 0.1a
|
32.8 ± 0.3a
|
34.5 ± 0.1
|
33.0 ± 0.3a
|
- Data represent means ± SE
- asignificantly different from Aged Ctl
- A significant effect of age, D significant effect of diet, X significant interaction
- CSA cross-sectional area, TPT time to peak twitch force; ½ RT half-relaxation time of twitch force, RFD rate of tetanic force development, RFR rate of tetanic force relaxation; norm, RFD rate of tetanic force development normalized to peak tetanic force, RFR rate of tetanic force relaxation normalized to peak tetanic force, twitch:tetanus ratio of peak twitch to peak tetanic force, lopt optimal length for twitch force production
