Dehydration is defined as the state of water deficit due to excessive water losses and/or small water intake. Underhydration is the result of inadequate water intake leading to activation of water hormonal homeostasis, characterized by elevated vasopressin, lower urinary output, and concentrated urine without any measurable changes in total body water. It is well established that dehydration (water deficit) decreases exercise performance and worsens mood, mainly in women. However, the impact of increased water intake in underhydrated individuals on their exercise capacity and mood is not known. The aim of the proposed study is to investigate the impact of increased water intake in underhydrated individuals on aerobic exercise performance and mood in both women and men.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
217
The underhydrated individuals will be instructed to increase their water intake for one week in order to meet the following two criteria: a) urinate at least 7 times per day and b) have straw-like color urine. A 2-mile run will be completed before and after the 7-day intervention.
The subjects that are classified as euhydrated will be asked to maintain high water intake for one week to ensure proper hydration. A 2-mile run will be completed before and after the 7-day intervention.
Interdisciplinary Science and Technology Building 8
Phoenix, Arizona, United States
2-mile run-time (min)
Time frame: Day 1
2-mile run-time (min)
Time frame: Day 8
Mood
Profile of Mood States questionnaire (POMS 2®-Adult Short, Multi-Health Systems Inc.)
Time frame: Pre-trial on day 1
Mood
Profile of Mood States questionnaire (POMS 2®-Adult Short, Multi-Health Systems Inc.)
Time frame: Post-trial on day 1
Mood
Profile of Mood States questionnaire (POMS 2®-Adult Short, Multi-Health Systems Inc.)
Time frame: Pre-trial on day 8
Mood
Profile of Mood States questionnaire (POMS 2®-Adult Short, Multi-Health Systems Inc.)
Time frame: Post-trial on day 8
Urine osmolality (mmol/kg)
Time frame: 4 - 8 PM on day 0
Urine osmolality (mmol/kg)
Time frame: 4 - 8 PM on day 7
Urine osmolality (mmol/kg)
Time frame: Upon waking (first morning sample) on day 1
Urine osmolality (mmol/kg)
Time frame: Upon waking (first morning sample) on day 8
Urine specific gravity
Time frame: 4 - 8 PM on day 0
Urine specific gravity
Time frame: 4 - 8 PM on day 7
Urine specific gravity
Time frame: Upon waking (first morning sample) on day 1
Urine specific gravity
Time frame: Upon waking (first morning sample) on day 8
Urine color
Armstrong validated 8-color scale. Minimum score: 1. Maximum score: 8. A higher score indicates a worse outcome (e.g., dehydrated).
Time frame: 4 - 8 PM on day 0
Urine color
Armstrong validated 8-color scale. Minimum score: 1. Maximum score: 8. A higher score indicates a worse outcome (e.g., dehydrated).
Time frame: 4 - 8 PM on day 7
Urine color
Armstrong validated 8-color scale. Minimum score: 1. Maximum score: 8. A higher score indicates a worse outcome (e.g., dehydrated).
Time frame: Upon waking (first morning sample) on day 1
Urine color
Armstrong validated 8-color scale. Minimum score: 1. Maximum score: 8. A higher score indicates a worse outcome (e.g., dehydrated).
Time frame: Upon waking (first morning sample) on day 8
Thirst perception
175 mm visual analog scale. Minimum score: 0 (not thirsty at all). Maximum score: 175 (extremely thirsty). A higher score indicates a worse outcome (e.g., more thirsty).
Time frame: 4 - 8 PM on day 0
Thirst perception
175 mm visual analog scale. Minimum score: 0 (not thirsty at all). Maximum score: 175 (extremely thirsty). A higher score indicates a worse outcome (e.g., more thirsty).
Time frame: 4 - 8 PM on day 7
Thirst perception
175 mm visual analog scale. Minimum score: 0 (not thirsty at all). Maximum score: 175 (extremely thirsty). A higher score indicates a worse outcome (e.g., more thirsty).
Time frame: Upon waking (first morning sample) on day 1
Thirst perception
175 mm visual analog scale. Minimum score: 0 (not thirsty at all). Maximum score: 175 (extremely thirsty). A higher score indicates a worse outcome (e.g., more thirsty).
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Time frame: Upon waking (first morning sample) on day 8