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Table 1 [Mg2+] and pH values at rest and end-exercise

From: Free Mg2+ concentration in the calf muscle of glycogen phosphorylase and phosphofructokinase deficiency patients assessed in different metabolic conditions by 31P MRS

  Rest End-Exercise  
  [Mg2+](mM) pH %PCr [Mg2+](mM) pH Δ[Mg2+] (mM)
McArdle I 0.34 6.98 53.1% 0.39 7.06* + 0.05
McArdle II 0.36 6.95 53.8% 0.32 7.07* - 0.04*
PFK I 0.38 6.95 54.1% 0.23* 7.01* - 0.15*
PFK II 0.45* 6.95 35.3% 0.23* 7.01* - 0.22*
Controls Mean (n = 10) 0.31 6.96 47.7% 0.42 6.8 +0.11
S.D. 0.04 0.02 13.8% 0.06 0.09 0.07
control range [min:max] [0.27:0.40] [6.94:7.00] [22:73] [0.35:0.54] [6.90:6.67] [+0.03:+0.24]
  1. Rest and end-exercise values of cytosolic [Mg2+] and pH assessed by 31P MRS in patients calf muscle, compared to the mean values obtained in a control group of ten healthy subjects with a comparable end-exercise PCr depletion;
  2. Δ[Mg2+]: difference between end-exercise [Mg2+] and rest [Mg2+];
  3. %PCr: percentage of PCr depletion
  4. * denotes values out of the range: control mean ± 2 SD.