Background: Patients with the sugar metabolism disorder, Glycogen Storage Disease Type V,
have insufficient breakdown of sugar stored as, glycogen, within the cells. The investigators
know from previous studies with McArdle patients, that they not only have a reduced sugar
metabolism, both also have problems in increasing their fat metabolism during exercise to
fully compensate for the energy deficiency.
Studies on Triheptanoin diet used in patients with other metabolic diseases have shown that
Triheptanoin can increase metabolism of both fat and sugar. In these patients, Triheptanoin
has had a positive effect on the physical performance and has reduces the level of symptoms
experienced by patients.
Aim: To investigate the effect of treatment with the dietary oil, Triheptanoin, in patients
with McArdle disease on exercise capacity.
Methods: 20-30 adult patients will be recruited through Rigshospitalet in Copenhagen, Denmark
and Hopital Pitié-Sapêtrière in Paris, France.
1. Pre-experimental testing (1 day): Baseline blood samples are collected to obtain
baseline values of safety parameters: Plasma-acylcarnitines, free fatty acids and
creatine kinase. Subjects perform a max-test to determine their VO2max
2. Treatment period #1 (2 weeks): Subjects follow a diet consuming a dietary treatment oil.
Neither patients nor members of the study group know who receive which type of oil.
3. Washout period (1 week +7 days): Subjects receive no treatment
4. Treatment period #2 (2 weeks +7days): Subjects who received Triheptanoin oil in the
first treatment period, now receive placebo oil and vice versa.
Assessments: Before and after each treatment periods, subjects perform a 30-minutes exercise
test on a cycle ergometer, comprising of 20-22 minutes of constant load exercise and 6-8
minutes increasing load to peak. Subjects will complete a Fatigue Severity Scale
questionnaire and metabolic products will be measured in blood and urine.
Phase:
Phase 2
Details
Lead Sponsor:
Institut National de la Santé Et de la Recherche Médicale, France