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van CCT (UK)

van CCT (UK)

Nitrate and sucrose: GI function

- candidate number26928
- NTR NumberNTR6491
- ISRCTNISRCTN no longer applicable
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR20-mrt-2017
- Secondary IDsMETC163045 NL59697.068.16
- Public TitleNitrate and sucrose: GI function
- Scientific TitleThe effect of dietary nitrate and sucrose on GI function during exercise
- hypothesisWe hypothesize that both nitrate and sucrose will reduce GI damage and improve GI blood flow during high-intensity exercise compared with placebo.
- Healt Condition(s) or Problem(s) studiedGastrointestinal damage, Gastrointestinal blood flow
- Inclusion criteria- Healthy (see exclusion criteria below)
- 18 - 40 years of age
- 18.5 < BMI < 30 kg/m2
- Engagement in regular cycling activity (at least 2x per wk)
- Wmax > 4.5 W/kg
- Exclusion criteria- Diagnosed or on medication for: Cardiovascular disease; Chronic Obstructive Pulmonary Disease (COPD); Rheumatoid arthritis (RA); Inflammatory bowel disease (IBD); Morbus Crohn and colitis ulcerosa; Irritable bowel syndrome; Inflammatory systemical diseases; Diabetes Mellitus; Diabetes Insipidus; Hypo- or hyperthyreoidism; Kidney failure; Donation of blood within the last 3 months; Cancer, Alcohol use of > 5 units per day; Drugs abuse; Use of regular medication; Oversensitive for sucrose; Phenol Keton Uria (PKU); Acute porphyria in the past.
- Smoking
- Currently supplementing diet with nitrate
- mec approval receivedyes
- multicenter trialno
- randomisedyes
- masking/blindingDouble
- controlPlacebo
- groupCrossover
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 10-jan-2017
- planned closingdate31-okt-2017
- Target number of participants16
- InterventionsOn each test day the subjects will perform 60 min of cycling at 70% Wmax, were the effect of each intervention on GI parameters will be investigated:
NIT: 1.1 g of NaNO3 (sodium nitrate) dissolved in 200 mL water 2.5 h prior to exercise. 200 mL water provided both 15 min prior and 30 min into exercise.
SUC: 1.1 g of NaCl (placebo) dissolved in 200 mL water 2.5 h prior to exercise. 20 g sucrose dissolved in 200 mL water provided both 15 min prior and 30 min into exercise.
PLA: 1.1 g of NaCl (placebo) dissolved in 200 mL water 2.5 h prior to exercise. 200 mL water provided both 15 min prior and 30 min into exercise.
- Primary outcomeIntestinal damage: plasma intestinal fatty acid binding protein (I-FABP)
- Secondary outcome Splanchnic perfusion, measured by gastrotonometry and arterial blood sampling
Plasma nitrate and nitrite concentrations
Plasma glucose
Resting blood pressure
- TimepointsScreening: 1 hour (inclusive Wmax test)
3 test days: each 5 hours, baseline blood sample + 3 hours of blood sampling and tonometry measurements every 20 min (total 9 samples); 1 hour prior to cycling, 1 hour during cycling and 1 hour post cycling.
- Trial web siteN/A
- statusinclusion stopped: follow-up
- Sponsor/Initiator Maastricht University, Human Movement Sciences
- Funding
(Source(s) of Monetary or Material Support)
- PublicationsN/A
- Brief summaryThe gastrointestinal (GI) tract plays an important role in the human body. The GI wall regulates the uptake of nutrients, and also has a very important function as a barrier between the internal and external environment. The penetration of harmful substances and microbiota from the GI lumen (external environment) into the systemic circulation (internal environment) depends on this barrier.
During high-intensity exercise, GI complaints and intestinal injury frequently occur, thereby hampering exercise performance. Splanchnic hypoperfusion, resulting in intestinal damage, has been postulated as one of the key underlying mechanisms for exercise associated GI symptoms. Attenuating such hypoperfusion therefore appears a promising strategy to reduce GI injury and its negative effects on performance. During episodes of splanchnic hypoperfusion, the synthesis of nitric oxide (NO) is suppressed. A previous study of our group found that supplementation with L-citrulline as a donor of the endogenous NOS dependent pathway lead to improved splanchnic blood flow and reduced intestinal damage during high intensity exercise. By acting as a local NO donor, through the nitrate-nitrite-NO pathway, dietary nitrate may also increase microcirculatory blood flow in the splanchnic area. Alternatively, the ingestion of carbohydrates will directly stimulate an increase in splanchnic microcirculatory blood flow, simply through the normal digestive processes taking place. Thus, both strategies may effectively reduce intestinal damage, and as such prove valuable in reducing the negative effects of exercise on the gut.

The aim of this study is to investigate the effects of both dietary nitrate and sucrose ingestion on splanchnic perfusion and intestinal (enterocyte) damage during high intensity exercise.
- Main changes (audit trail)
- RECORD20-mrt-2017 - 31-aug-2017

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