DETECTION OF EUHYDRATION IN HUMANS FROM THE DIURESIS RESPONSE TO A WATER LOAD
Journal Title: Medicina Sportiva - Year 2012, Vol 16, Issue 1
Abstract
Objectives: to calculate the minimum amount of water to be ingested in order to find significant differences in one-hour urine volume between euhydrated and dehydrated humans.Methods: Five participants (22.6±2.9 years old, 63.70±13.18 kg; mean±standard deviation) were evaluated following an overnight fast, on eight different non-consecutive days, using a factorial block design. For the euhydration condition (EuA, EuB, EuC and EuD), they remained seated for 45 minutes. For the dehydration condition (DeA, DeB, DeC and DeD), they exercised intermittently at 33±4° C, 65±6% relative humidity until they were dehydrated by 1% of body mass (BM). The order of treatments was randomized. Next, they ingested a water volume equivalent to 0.5% BM, 0.72% BM, 1.07% BM or 1.43% BM in 30 minutes, under both the euhydration and the dehydration conditions. Urine volumes were collected 0, 30, and 60 minutes after water ingestion.Results: baseline values were consistent among conditions (P > 0.05), and there was no difference in water intake volume between euhydration and dehydration (P > 0.05). There was a clear association between the volume of water in¬take and urine volume (R2 = 0.64, R2a = 0.58; P = 0.001); in addition, this tendency was different between euhydration and dehydration (interaction P = 0.005). Finally, ingestion of water equivalent to 1.07% BM or more resulted in a 95% CI for the urine volume difference between euhydration and dehydration greater than 100 mL.Conclusion: the minimum volume of water to be ingested to detect a 100 mL difference in one-hour urine volume between euhydrated and dehydrated humans is 1.07% BM.
Authors and Affiliations
Catalina Capitán-Jiménez , Luis Aragón-Vargas
Keywords
Related Articles
- EP ID EP74173
- DOI -
- Views 143
- Downloads 0
ACUTE EFFECTS OF DIFFERENT STRENGTH INTENSITIES ON UNSTABLE AND STABLE PLATFORMS ON STRENGTH PERFORMANCE AND SUBJECTIVE EFFORT PERCEPTION IN BENCH PRESS EXERCISE
Introduction: The Swiss ball is an unstable platform that is becoming an important tool in the application of strength exercises because of the greater requirements on the neuromotor and neuromuscular systems.Objective:...
ASSESSMENT OF DIET OF YOUNG MEDIUM- AND LONG-DISTANCE RUNNERS
Introduction: Nutrition is one of the main factors influencing physical performance. Furthermore, a well-balanced diet is a key determinant of optimal biological development of young athletes. Objective: To assess the di...
DOES THE SEQUENCE OF EXERCISE IN A RESISTANCE TRAINING SESSION AFFECT STRENGTH GAINS AND MUSCULAR HYPERTROPHY? A CRITICAL EXAMINATION OF THE EVIDENCE Ralph N. Carpinelli
In a recent review of resistance training, the authors claimed that the sequence of performing resistance exercises in a training session is an important variable that can influence the efficiency, safety and effectivene...
THE EFFECTS OF IBUPROFEN ON MUSCLE PERFORMANCE, WORKLOAD AND PLASMA CREATINE KINASE DURING A STRENGTH TRAINING SESSION
Introduction: Non-steroidal anti-inflammatory drugs are the most often used substances by athletes. Objective: To determine the effect of non-steroidal anti-inflammatory drug ibuprofen administration before a resistanc...
INFLUENCE OF PHYSICAL TRAINING ON THE FUNCTION OF AUTONOMIC NERVOUS SYSTEM IN PROFESSIONAL SWIMMERS
Introduction: Regular endurance - type physical exercise exerts positive effect on the capacity and endurance of body and the activity of the autonomic nervous system (ANS). In contrast, the exercise load used in profess...