Effect of Different Fluid Ingestion Rate on Post-exercise Rehydration

Study Overview
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Brief Summary
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The purpose of the present study is to investigate the effect of different rate of fluid consumption on post-exercise rehydration.

Detailed Description
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The body water deficits equivalent to 2% body mass might impair performance. Due to high exercise intensity, thermal environment, or rule limitation, athletes often in dehydration status post-exercise. Thus, how to rehydrate effectively to prepare the next game is important. The participants arrived to the lab euhydrated and were dehydrated to 2% of body weight by running. After a rest, they will ingest sports drink in a volume equivalent to 150% of BW loss in 30 min, 60 min, or 90 min. Urine and blood sample will be collected to evaluate hydration status.

Official Title
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Effect of Different Fluid Ingestion Rate on Post-exercise Rehydration

Conditions
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Dehydration

Intervention / Treatment
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* Procedure: Different Fluid Ingestion Rate


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 20 35 years old male Exercise 150 min per week Without chronic disease or gastrointestinal surgery Exclusion Criteria: Injury Answer Yes in part 1 of the Physical Activity Readiness Questionnaire(PAR-Q+) Participate in other studies within one month

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 30min<br>The participants arrived to the trials euhydrated and were dehydrated to 2% of body weight (BW) by running. After a rest, they ingested sports drink in a volume equivalent to 150% of BW loss in 30 min. | Procedure: Different Fluid Ingestion Rate<br>* The participants ingested sports drink in a volume equivalent to 150% of BW loss, in 30 min, 60 min, or 90min.<br>|
| Experimental: 60min<br>The participants arrived to the trials euhydrated and were dehydrated to 2% of body weight (BW) by running. After a rest, they ingested sports drink in a volume equivalent to 150% of BW loss in 60 min. | Procedure: Different Fluid Ingestion Rate<br>* The participants ingested sports drink in a volume equivalent to 150% of BW loss, in 30 min, 60 min, or 90min.<br>|
| Experimental: 90min<br>The participants arrived to the trials euhydrated and were dehydrated to 2% of body weight (BW) by running. After a rest, they ingested sports drink in a volume equivalent to 150% of BW loss in 90 min. | Procedure: Different Fluid Ingestion Rate<br>* The participants ingested sports drink in a volume equivalent to 150% of BW loss, in 30 min, 60 min, or 90min.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| specific gravity of urine(SG) | dehydration: >= 1.020 | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 
| Osmolality(Urine) | dehydration: >= 700 mosm/kg | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 
| Osmolality(Blood) | dehydration: >= 290 mosm/kg | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 
| Vasopressin | Vasopressin, also called antidiuretic hormone (ADH), arginine vasopressin (AVP) or argipressin, is a hormone synthesized as a peptide prohormone in neurons in the hypothalamus, and is converted to AVP. Increasing the water reabsorption and excretion of more concentrated urine. | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 
| sodium(blood) | 135 145mEq/L | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 
| Body weight change | measure body weight at baseline, dehydration, 1st and 2nd hour in recovery period in kg | Change from baseline outcome measure at dehydration and 1st and 2nd hour in recovery period | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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sports nutrition, dehydration, sports medicine, rehydration, ingestion rate