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Table 3 Muscle Function and Morphology

From: Dietary fish oil supplement induces age-specific contractile and proteomic responses in muscles of male rats

  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
  1. Data represent means ± SE
  2. asignificantly different from Aged Ctl
  3. A significant effect of age, D significant effect of diet, X significant interaction
  4. 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