- ICH GCP
- Yhdysvaltain kliinisten tutkimusten rekisteri
- Kliininen tutkimus NCT07675603
Low-carbohydrate Diet and Low-Density Lipoprotein - Cholesterol (LDL-c) Interindividual Variability (REPETO)
Exploring True Interindividual Heterogeneity of Cardiovascular Disease (CVD) Risk Factors in Response to Low-carbohydrate Diets Using a Replicate Crossover Randomised Controlled Trial
Tutkimuksen yleiskatsaus
Yksityiskohtainen kuvaus
The study will be a controlled feeding replicate randomised controled trial with 3 cycles, each involving the pair of diets [low carbohydrate (K) and control (C) diets]. There will be 6 x 1-day periods (3 days low carbohydrate and 3 days control). Twenty individuals (body mass index: 18.5-35 kg/m2) will be recruited and randomised into one of the 8 possible sequences:
- KC KC KC
- KC KC CK
- KC CK KC
- KC CK CK
- CK CK CK
- CK CK KC
- CK KC CK
- CK KC KC A week before the interventions start, participants will visit the laboratory so that the investigators can perform indirect calorimetry and collect a blood sample for genotyping. During the week before the interventions, participants will wear activity monitors to determine habitual physical activity. Before each visit, participants will be asked to come to the lab in a rested and overnight fasted state. During the first trial visit, participants will have a dual-energy X-ray absorptiometry (DEXA) body scan to determine body composition. During all 12 study visits the investigators will perform a venepuncture in an antecubital vein and will collect 20 mL of blood.
Additionally, the investigators will also collect urine samples. After odd visits (1st, 3rd, 5th, 7th, 9th and 11th), participants will be supplied with their respective meals for the day (low carbohydrate or control) and will be asked to not eat anything else during the day.
Finally there will be a wash-out period of 6 days between laboratory visits. To keep consistency between trial days, participants will be asked to replicate physical activity levels performed during the 24 hours before the first trial, and during diet day (before second visit), so that these can be replicated for the following visits.
Opintotyyppi
Ilmoittautuminen (Arvioitu)
Vaihe
- Ei sovellettavissa
Yhteystiedot ja paikat
Opiskeluyhteys
- Nimi: Bruno Spellanzon, PhD candidate
- Puhelinnumero: 447769407954
- Sähköposti: bs954@bath.ac.uk
Opiskelupaikat
-
-
Bath and North East Somerset
-
Bath, Bath and North East Somerset, Yhdistynyt kuningaskunta, BA2 7AY
- Rekrytointi
- University of Bath
-
Päätutkija:
- Javier Gonzalez, PhD
-
Ottaa yhteyttä:
- Bruno Spellanzon, PhD candidate
- Puhelinnumero: 447769407954
- Sähköposti: bs954@bath.ac.uk
-
Ottaa yhteyttä:
- Javier Gonzalez, PhD
- Sähköposti: jg833@bath.ac.uk
-
-
Osallistumiskriteerit
Kelpoisuusvaatimukset
Opintokelpoiset iät
- Aikuinen
- Vanhempi Aikuinen
Hyväksyy terveitä vapaaehtoisia
Kuvaus
Inclusion Criteria:
- Age: >18 years
- Body mass index: 18.5-35 kg·m-2
- Low-Density Lipoprotein-cholesterol <4.9 mmol/L
- Non-fasting triglycerides <2.3 mmol/L
Exclusion Criteria:
- weight instability (>5% change in body mass within last 3 months)
- smoker
- diagnosis of hypercholesterolaemia or any other lipid-related disease
- diagnosis of diabetes
- diagnosis of atherosclerotic cardiovascular disease
- elevated fasting glucose (>5.4 mmol/L)
- dietary intolerances or allergies or to other study procedures
- diagnosis of gastrointestinal disorders
- any other condition/medication that could introduce bias to the study
- already following a ketogenic diet
- not willing to follow a ketogenic diet
- unable to understand English language
Opintosuunnitelma
Miten tutkimus on suunniteltu?
Suunnittelun yksityiskohdat
- Ensisijainen käyttötarkoitus: Perustiede
- Jako: Satunnaistettu
- Inventiomalli: Crossover-tehtävä
- Naamiointi: Ei mitään (avoin tarra)
Aseet ja interventiot
Osallistujaryhmä / Arm |
Interventio / Hoito |
|---|---|
|
Muut: Sequence 1
Participants will follow a 1) low-carbohydrate diet, wash-out, 2) control diet, wash-out, 3) low-carbohydrate diet, wash-out, 4) control diet, wash-out, 5) low-carbohydrate diet, wash-out, 6) control diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 2
Participants will follow a 1) low-carbohydrate diet, wash-out, 2) control diet, wash-out, 3) low-carbohydrate diet, wash-out, 4) control diet, wash-out, 5) control diet, wash-out, 6) low-carbohydrate diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 3
Participants will follow a 1) low-carbohydrate diet, wash-out, 2) control diet, wash-out, 3) control diet, wash-out, 4) low-carbohydrate diet, wash-out, 5) control diet, wash-out, 6) low-carbohydrate diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 4
Participants will follow a 1) low-carbohydrate diet, wash-out, 2) control diet, wash-out, 3) control diet, wash-out, 4) low-carbohydrate diet, wash-out, 5) low-carbohydrate diet, wash-out, 6) control diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 5
Participants will follow a 1) control diet, wash-out, 2) low-carbohydrate diet, wash-out, 3) control diet, wash-out, 4) low-carbohydrate diet, wash-out, 5) control diet, wash-out, 6) low-carbohydrate diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 6
Participants will follow a 1) control diet, wash-out, 2) low-carbohydrate diet, wash-out, 3) control diet, wash-out, 4) low-carbohydrate diet, wash-out, 5) low-carbohydrate diet, wash-out, 6) control diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 7
Participants will follow a 1) control diet, wash-out, 2) low-carbohydrate diet, wash-out, 3) low-carbohydrate diet, wash-out, 4) control diet, wash-out, 5) control diet, wash-out, 6) low-carbohydrate diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
|
Muut: Sequence 8
Participants will follow a 1) control diet, wash-out, 2) low-carbohydrate diet, wash-out, 3) low-carbohydrate diet, wash-out, 4) control diet, wash-out, 5) low-carbohydrate diet, wash-out, 6) control diet
|
Diet will have macronutrients split with 50% carbohydrates, 15% protein and 35% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
Diet will have macronutrients split with 8% carbohydrates, 15% protein and 77% fat.
Also there will be a 0.66 ratio saturated:unsaturated fat
|
Mitä tutkimuksessa mitataan?
Ensisijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
|
Fasted plasma Low-density lipoprotein cholesterol (LDL-C) concentrations
Aikaikkuna: Pre and post following each intervention/control diet for 24 hours
|
Variable will be used to establish whether there is true inter-individual heterogeneity in response to 24 hours of a low-carbohydrate diet. Measured in mmol/L. |
Pre and post following each intervention/control diet for 24 hours
|
Toissijaiset tulostoimenpiteet
Tulosmittaus |
Toimenpiteen kuvaus |
Aikaikkuna |
|---|---|---|
|
Fasted glucose plasma glucose concentration
Aikaikkuna: Pre and post following each intervention/control diet for 24 hours
|
Variable measured to establish whether there is true inter-individual heterogeneity in response to 24 hours of a low-carbohydrate diet. Measured in mmol/L |
Pre and post following each intervention/control diet for 24 hours
|
Yhteistyökumppanit ja tutkijat
Sponsori
Tutkijat
- Päätutkija: Javier Gonzalez, PhD, University of Bath
Opintojen ennätyspäivät
Opi tärkeimmät päivämäärät
Opiskelun aloitus (Todellinen)
Ensisijainen valmistuminen (Arvioitu)
Opintojen valmistuminen (Arvioitu)
Opintoihin ilmoittautumispäivät
Ensimmäinen lähetetty
Ensimmäinen toimitettu, joka täytti QC-kriteerit
Ensimmäinen Lähetetty (Todellinen)
Tutkimustietojen päivitykset
Viimeisin päivitys julkaistu (Todellinen)
Viimeisin lähetetty päivitys, joka täytti QC-kriteerit
Viimeksi vahvistettu
Lisää tietoa
Tähän tutkimukseen liittyvät termit
Muita asiaankuuluvia MeSH-ehtoja
Muut tutkimustunnusnumerot
- 8791-12081
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