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. Author manuscript; available in PMC: 2014 Jul 9.
Published in final edited form as: J Appl Physiol (1985). 2006 May 18;101(3):898–905. doi: 10.1152/japplphysiol.00126.2006

Table 2.

Contractile Properties of EDL and Soleus Muscles

MSTN+/+ MSTN+/− MSTN−/−
EDL Muscles
  Pt (mN) 110.78±4.84 136.76±12.33 160.87±8.07*
  sPt (mN/mm2) 58.20±1.75 63.27±5.10 52.25±3.38
  TTPT (ms) 23.68±2.80 20.91±1.32 23.86±2.46
  ½RT (ms) 22.56±1.48 20.80±1.02* 15.51±0.25*#
  dP/dt (mN/ms) 13.07±0.05 15.64±1.29 19.00±1.24*#
  Po (mN) 461.19±14.69 520.53±18.48* 616.93±17.10*#
  sPo (mN/mm2) 243.32±10.04 242.12±8.22 199.86±7.37*#
Soleus Muscles
  Pt (mN) 47.12±2.78 60.43±5.00 65.52±5.85*
  sPt (mN/mm2) 42.08±1.90 47.51±2.30 45.06±3.81
  TTPT (ms) 40.61±4.68 32.41±0.99 27.38±3.75
  ½RT (ms) 50.10±5.42 47.55±2.13 37.57±1.92
  dP/dt (mN/ms) 4.20±0.21 4.91±0.33 6.08±0.80
  Po (mN) 295.84±7.49 324.94±18.52 385.06±17.57*#
  sPo (mN/mm2) 265.81±10.10 257.15±6.34 264.84±8.50

Values are means ± SE. N = 6 muscles per genotype. Pt = peak twitch force; sPt = specific Pt; TTPT = time to peak twitch tension; ½RT = half-relaxation time; dP/dt = maximum rise in tension.

*

Significantly different from MSTN+/+ at P < 0.05.

#

Significantly different from MSTN+/− at P < 0.05.