Français
Albanian
Arabic
Armenian
Azerbaijani
Belarusian
Bengali
Bosnian
Catalan
Czech
Danish
Deutsch
Dutch
English
Estonian
Finnish
Français
Greek
Haitian Creole
Hebrew
Hindi
Hungarian
Icelandic
Indonesian
Irish
Italian
Japanese
Korean
Latvian
Lithuanian
Macedonian
Mongolian
Norwegian
Persian
Polish
Portuguese
Romanian
Russian
Serbian
Slovak
Slovenian
Spanish
Swahili
Swedish
Turkish
Ukrainian
Vietnamese
Български
中文(简体)
中文(繁體)

LIFESTAT - Living With Statins, a Cross Sectional Study

Seuls les utilisateurs enregistrés peuvent traduire des articles
Se connecter S'inscrire
Le lien est enregistré dans le presse-papiers
StatutTerminé
Les sponsors
University of Copenhagen

Mots clés

Abstrait

Background Statins are cholesterol lowering drugs that are prescribed to lower the risk of cardio-vascular diseases (CVD). The use of statins has increased markedly and it is now one of the most prescribed drugs in the world. 600,000 people in Denmark are taking statins on a daily basis, 40 % of these are taking the medication without having any other risk factors for CVD than elevated blood-cholesterol i.e. they are in primary prevention.
Statins are not without side effects and studies have shown that there is an elevated risk of developing diabetes when taking statins. This has led to an increased debate about the use of statins in primary prevention. Furthermore a large meta-analysis has shown that to prevent one event of CVD, it is necessary to treat 200 people for 3-5 years. These data suggest that more conservative use of statins to prevent CVD in otherwise healthy individuals at low risk for future CVD may be warranted.
Other side effects of statins are muscle myalgia, muscle cramps and fatigue which potentially can prevent a physically active lifestyle. The biomedical background of these side effects is not fully elucidated but it has been shown that there is a link to decreasing levels of an important enzyme, Q10, which plays a role in muscle energy metabolism.
Hypothesis
The overarching research question is: why does statin treatment cause muscle pain? Does statin treatment impair (or even prohibit) physical exercise training? Furthermore we would like to answer the following questions:
a Does statin treatment impair (or even prohibit) physical exercise training?
b Does statin treatment cause:
- Decreased muscle strength?
- Skeletal muscle inflammation?
- Decreased mitochondrial respiratory function?
c Abnormal glucose homeostasis?

La description

Background

HYPERCHOLESTEROLEMIA AND STATIN USE IN DENMARK

Simvastatin is the most commonly prescribed statin, a class of drugs that inhibit hydroxyl-methyl-glutaryl (HMG) coenzyme A reductase, and thereby blocking biosynthesis of cholesterol in the liver. Simvastatin is prescribed for individuals with elevated low-density lipoprotein cholesterol (LDL-C) and/or total cholesterol, because these clinical parameters are viewed as a risk factor for cardiovascular-disease (CVD), even in the absence of other health problems or risk factors, such as previous myocardial infarction, diabetes or hypertension.

Approximately 40% of the prescriptions for statins are issued for primary prevention of elevated cholesterol by general practitioners to patients without bodily symptoms or signs. Only the "cholesterol number" makes the risk of heart attack and stroke visible. The lack of symptoms is likely to be of importance for patients' adherence to treatment as is adverse effects. A number of factors, such as information in mass media and changes in daily life, may affect the decision to take the treatment.

TREATMENT GUIDELINES FOR HYPERCHOLESTEROLEMIA

The guidelines (10; 12) indicate preventive treatment with statins is appropriate in individuals with >10% predicted risk of a major vascular event within 5 years, while, some, but not all opinion-leaders advocate a 5% threshold (3; 10). Nevertheless, statin therapy failed to reduce all-cause mortality in a meta-study of 65,229 patients without CVD, some of whom had diabetes (13). Similarly, a Cochrane review analysis, which included some studies in which more than 10% of the patients had history of CVD, showed only 0.5% reduction in all-cause mortality, indicating that for every 200 patients taking statins daily for 5 years, 1 death would be prevented (15). These data suggest that more conservative use of statins to prevent CVD in otherwise healthy individuals at low risk for future CVD may be warranted.

THE DOWN-SIDE

Rhabdomyolysis (skeletal muscle cell death) is an infrequent but serious side-effect of statin use, that can on rare occasion lead to acute renal failure and death (i.e., 1.5 deaths per 106 prescriptions (11)). Statin use is much more frequently associated with muscle dysfunction, including myalgia (muscle pain), cramps, and weakness. The reported incidence of myalgia varies from 1% (pharmaceutical company reports) to as high as 75% in statin-treated athletes (9; 11). Mild to severe myalgia is a strong disincentive to regular exercise, and because regular exercise is one of the critical life-style approaches to preventing CVD and reducing blood cholesterol, this is a significant down-side of statin use. Regular exercise is also effective in preventing and treating obesity and type 2 diabetes, which themselves are risk factors for CVD (18).

The mechanism behind the myalgia is not known. However, we have recently demonstrated that muscle mitochondrial function is impaired with statin treatment and the Q10 protein may play a key role in this (8). In addition, the statins also negatively affect the glucose tolerance (8), increasing the risk of type 2 diabetes.

RESEARCH QUESTIONS:

The overarching research question is: why does statin treatment cause muscle pain? We are not the only research group in the world that try to answer that question, but we are the only one that has indeed provided a mechanistic explanation, and provided a proof-of-concept (8). We will now test this in a larger patient population.

Our background in muscle and exercise physiology and in bioenergetics makes it natural to further ask:

a Does statin treatment impair (or even prohibit) physical exercise training?

b Does statin treatment cause:

- Decreased muscle strength?

- Skeletal muscle inflammation?

- Decreased mitochondrial respiratory function?

c Abnormal glucose homeostasis?

Re question b & c: If so, can physical training counteract this effect of statin treatment?

Methodology

COHORT

Patients that fulfil defined inclusion and exclusion criteria will be recruited from pharmacies and through advertisement in newspapers in Copenhagen. The vast majority of these patients are being treated on basis of the HeartScore risk estimation system that offers direct estimation of the ten-year risk of fatal cardiovascular disease in a format suited to the constraints of clinical practice (16) (www.HeartScore.org). A staggered recruitment will be implemented.

60 patients both men and women (age: 40-70 years; BMI: 25-35 kg/m2) that are being treated with Simvastatin minimum 40 mg/day as primary prevention are recruited. No other risk factors for CVD except elevated total cholesterol and/or elevated LDL cholesterol and mild hypertension (<145/100 mm Hg) must be present.

The test subjects will undergo three experimental days as described below:

Experimental days:

Day 1 (½ day - overnight fasting):

- Medical history; clinical examination + ECG. Measurements: Blood pressure, weight, height, W/H-ratio, thigh circumference.

- Dual Energy X-ray Absorptiometry-scan (body composition and body fat).

- FatMax test and maximal oxygen uptake test (VO2-max) or ergometer bike.

Day 2 (½ day - overnight fasting):

- Oral glucose tolerance test + score questionnaire for muscle pain/discomfort (incl. Visual Analog Scale)

- Isokinetic strength and Rate of Force Development (PowerRig and KinCom dynamometer).

- Repeated VO2-max-test

Day 3 (1 day - overnight fasting):

- Muscle biopsy, vastus lateralis (before and after clamp) and fat biopsy from the subcutaneous adipose tissue in the abdomen.

- Intravenous glucose tolerance test (IVGTT)

- Euglycemic, hyperinsulinaemic clamp.

Statistical considerations

The major end-points are all end-point which we have tested before in other clinical populations. In general, in order to detect a 10% difference in these parameters before vs. after a training program or between statin users and control, requires 20-25 subjects in each group if an alpha level of <0.05 and risk of type 2 error is set to 10%. 20-25 subjects are necessary if the "conventional" 20% type 2 error risk is implemented. Thus, the present study has a considerable safety-margin in terms of statistical power.

Rendez-vous

Dernière vérification: 08/31/2016
Première soumission: 09/11/2014
Inscription estimée soumise: 09/23/2014
Première publication: 09/25/2014
Dernière mise à jour soumise: 09/22/2016
Dernière mise à jour publiée: 09/25/2016
Date de début réelle de l'étude: 03/31/2014
Date d'achèvement primaire estimée: 08/31/2016
Date estimée d'achèvement de l'étude: 08/31/2016

Condition ou maladie

Cardiovascular Disease
Diabetes Mellitus

Phase

-

Groupes d'armes

BrasIntervention / traitement
Patients with myalgia
Patients with myalgia as a side effect to treatment with Simvastatin (minimum 20 mg daily)
Patients without myalgia
Patients treated with Simvastatin (minimum 20 mg daily) without any side effects to the treatment
Control group
Patients with elevated serum cholesterol not treated with cholesterol lowering drugs

Critère d'éligibilité

Âges éligibles aux études 40 Years À 40 Years
Sexes éligibles à l'étudeAll
Méthode d'échantillonnageNon-Probability Sample
Accepte les bénévoles en santéOui
Critères

Inclusion Criteria:

- 40-70 years

- BMI 25-35

- Taking Simvastatin minimum 40 mg daily

Exclusion Criteria:

- Diabetes Mellitus

- Cardiovascular disease such as arrythmia, ischaemic heart disease

- Mental disorders preventing the subject to understand the project description

Résultat

Mesures des résultats primaires

1. Differences in physical performance between two groups of statin treated patients [Three experimental days]

Differences in physical performance is measured by VO2-max and muscle strength

Rejoignez notre
page facebook

La base de données d'herbes médicinales la plus complète soutenue par la science

  • Fonctionne en 55 langues
  • Cures à base de plantes soutenues par la science
  • Reconnaissance des herbes par image
  • Carte GPS interactive - étiquetez les herbes sur place (à venir)
  • Lisez les publications scientifiques liées à votre recherche
  • Rechercher les herbes médicinales par leurs effets
  • Organisez vos intérêts et restez à jour avec les nouvelles recherches, essais cliniques et brevets

Tapez un symptôme ou une maladie et lisez des informations sur les herbes qui pourraient aider, tapez une herbe et voyez les maladies et symptômes contre lesquels elle est utilisée.
* Toutes les informations sont basées sur des recherches scientifiques publiées

Google Play badgeApp Store badge