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Abstract
We used phosphorus magnetic resonance spectroscopy (31P-MRS) to study the effect of exercise-induced muscle injury in the calf muscle of
7 DMD/BMD carriers and 6 non-carrier females. All subjects performed 50–80 lengthening
contractions with the right calf muscles. 48 h after lengthening exercise non-carriers
showed increased sensitivity to pressure in their gastrocnemius accompanied by increased
T2 relaxation times and by elevated
ratios at rest. DMD/BMD carriers did not show any effect of lengthening exercise
on these measurements. In-magnet exercise revealed in all carriers a reduced initial
rate of Pi recovery and an increased time to fully recover the resting value of intracellular
pH. Lengthening exercise further decreased the initial rate of Pi recovery. Non-carriers did not show any variation attributable to lengthening exercise
either during in-magnet work or during recovery from exercise. We found that lengthening
exercise contractions causes: (1) less muscle injury in carriers compared to non-carriers,
(2) even slower rate of Pi recovery, but (3) no effect on Pi recovery in non-carriers. The use of lengthening exercise and measurements of Pi recovery may be a useful method to evaluate the disease process in DMD/BMD.

Keywords
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Article info
Publication history
Accepted:
April 23,
1993
Received in revised form:
April 12,
1993
Received:
January 25,
1993
Identification
Copyright
© 1993 Published by Elsevier Inc.