Modified Ketogenic Diet in Patients With McArdle Disease Part A - a Pilot Study
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 11
- 试验地点
- 1
- 主要终点
- Heart rate
研究概览
简要总结
McArdle disease, glycogen storage disease type V, is a rare metabolic disease. Affected individuals are unable to utilize sugar stored as glycogen in muscle.
We hypothesize that a modified ketogenic diet could be a potential treatment option, by providing ketones as alternative fuel substrates for working muscle.
In this open interventional pilot study we wish to investigate 3 different modified ketogenic diet regimes, to find an optimal composition of a modified ketogenic diet that ensures adequate degree of ketosis and at the same time is well tolerated for patients with McArdle disease.
详细描述
Open interventional study to investigate 3 different modified ketogenic diet regimes, to find an optimal composition of a modified ketogenic diet for patients with McArdle disease
McArdle disease, glycogen storage disease type V, is a rare metabolic disease caused by mutations in the PYGM gene resulting in absence of the enzyme muscle phosphorylase. Affected individuals are unable to utilize sugar stored as glycogen in muscle, leading to exercise intolerance, exercise-induced muscle pain, contractures and rhabdomyolysis, which may cause renal failure. Currently, there are no satisfactory treatment options for McArdle disease. Ketones are feasible fuel alternatives to muscle glycogen when muscle glycogenolysis is blocked as in McArdle disease.
A key element of alleviating symptoms in McArdle disease is to provide alternative fuels for energy metabolism. Ketosis can potentially provide alternative fuel substrates by provision of endogenous ketone bodies (KBs) which are desirable fuels for skeletal muscle and brain. Ketosis can be reached by fasting and can be induced by adhering to a modified ketogenic diet, which entails a high-fat, low-carbohydrate diet, which simulates the metabolic effects of fasting.
The optimal modified ketogenic diet composition, that ensures adequate degree of ketosis and at the same time is well tolerated, has not been investigated in patients with McArdle disease. Therefore this pilot study seeks to investigate which of 3 different diets is the most optimal ad effective for patients with McArdle disease. The 3 different diets will have carbohydrate percentages ranging from 5-25%, and fat percentage from 60-80%.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Genetically confirmed GSDV
- •Patient is willing and able to provide written informed consent prior to participation.
- •Patient is ambulatory.
- •Women in fertile age must be willing to practice the following medically acceptable methods of birth control
排除标准
- •Patient has any prior or current medical conditions that, in the judgment of the Investigator, would prevent the patient from safely participating in and/or completing all study requirements.
- •Pregnancy or breastfeeding
- •Patient does not have the cognitive capacity to understand/comprehend and complete all study assessments
- •Patients with porphyria or disorders of fat metabolism (primary carnitine deficiency, carnitine palmitoyltransferase I or II, β-oxidation defects etc.).
研究组 & 干预措施
diet 1
60% fat, 15% protein, 25% carbohydrates
干预措施: Modified ketogenic diets (Other)
diet 2
70% fat, 15% protein, 15% carbohydrates
干预措施: Modified ketogenic diets (Other)
diet 3
80% fat, 15% protein, 5% carbohydrates
干预措施: Modified ketogenic diets (Other)
结局指标
主要结局
Heart rate
时间窗: 2 times
heart rate during constant load cycling exercise
次要结局
- Perceived exertion(2 times)
- Compliance(3 weeks)
- indirect calorimetry(2 times)
- level of ketosis(daily)
- Safety parameters(2 times)
- other blood samples(2 times)
研究者
Nicoline Løkken
MD, PhD-student
Rigshospitalet, Denmark