Hydration assessment among marathoners using urine specific gravity and bioelectrical impedance analysis

Cutrufello, Paul T.; Dixon, Curt B.; Zavorsky, Gerald S.

doi:10.1080/15438627.2016.1202831

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…The primary finding from this investigation was that the change in TBW estimated from SMFBIA did not match, or even approach, the change in body mass following dehydration or hyperhydration. This finding was expected as others reported that BIA and SMFBIA were not accurate at tracking acute hydration changes [21][22][23][24][25]. Further, changes in impedance were more pronounced following dehydration than hyperhydration in the present study.…”

Section: Discussionsupporting

confidence: 70%

Bioelectrical impedance changes of the trunk are opposite the limbs following acute hydration change

Wagner

2022

Journal of Electrical Bioimpedance

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This study aimed to evaluate the changes in impedance and estimates of body composition variables obtained from segmental multi-frequency bioelectrical impedance analysis (SMFBIA) following acute hydration change. All participants (N = 11 active adults) had SMFBIA measurements at baseline (euhydration), post-dehydration, and post-hyperhydration in an experimental repeated-measures design. Dehydration and hyperhydration trials were randomized with the opposite treatment given 24 h later. Dehydration was achieved via a heat chamber of 40 °C and 60% relative humidity. Hyperhydration was achieved by drinking lightly-salted water (30 mmol·L-1 NaCl; 1.76 g NaCl·L-1) within 30 min. Post-measurements were taken 30 min after each treatment. Despite changes in mass post-dehydration (Δ = -2.0%, p < 0.001) and post-hyperhydration (Δ = 1.2%, p < 0.001), SMFBIA estimates of total body water (TBW) did not change significantly across trials (p = 0.507), leading to significant differences (p < 0.001) in SMFBIA-estimates of body fat percentage across trials. Dehydration resulted in a significant (p < 0.001) 8% decrease in limb impedances at both 20 kHz and 100 kHz. Hyperhydration increased limb impedances only slightly (1.5%, p > 0.05). Impedance changes in the trunk followed an opposite pattern of the limbs. SMFBIA failed to track acute changes in TBW. Divergent impedance changes suggest the trunk is influenced by fluid volume, but the limbs are influenced by ion concentration.

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Section: Discussionsupporting

confidence: 70%

Bioelectrical impedance changes of the trunk are opposite the limbs following acute hydration change

Wagner

2022

Journal of Electrical Bioimpedance

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“…The runners experienced a significant weight loss, and these changes suggest a change in hydration status likely resulting from exercise-induced fluid loss. 19 The hydration status in the athletes is assessed by monitoring weight and urine concentration. We assessed weight loss and found that after running, there was a significant decrease in body weight.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of volume status in a prehospital setting by ultrasonographic measurement of inferior vena cava and aorta diameters

Ragaisyte

Bardauskienė

Zelbienė

et al. 2018

Turkish Journal of Emergency Medicine

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ObjectivesThe aim of this study was to evaluate the utility of ultrasonographic measurement of the diameter of the inferior vena cava (IVCD) and abdominal aorta (AAD) for assessing volume status.Material and methodsThis was a prospective, observational study. A total of 23 volunteers participated in the study. Each participant was selected randomly. All participants completed the 2016 Kaunas Marathon. Participants filed out a brief survey about their fluid intake (in standardised glasses) in the 24 h before the race and during the race. Participants underwent ultrasound measurements 10–40 min before the start of the race and 3–15 min after finishing the race. To visualize respiratory variation, M-mode was used, with the beam crossing the IVCD 2 cm from the right atrium. The AAD was measured 1 cm above the celiac trunk. IVCD in expiration (IVCDexp)/AAD was calculated by dividing the value of IVCDexp by the value of AAD. The findings were compared with difference in body mass index.ResultsThe mean weight lost after the marathon was 2.93 kg (p < 0.001). Mean IVCD in inspiration (IVCDins) after the run was lower by 0.39 cm (p < 0.001) then before the run. Mean IVCDexp/AAD after the run was 0.24 cm lower than before the run (p = 0.03). Before and after the marathon, there was a statistically significant negative correlation in weight difference, with mean IVCDexp difference (p = 0.047). There was no statistically significant difference in caval index before and after running.ConclusionUltrasonographic assessment of IVCDexp could be useful in the evaluation of volume status.

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“…Only at T5 was there found to be a transversal moderate positive correlation between R/H and Z/H and USG, which is clearly not enough to state that the two methods are correlated. Marathon runners have also reported this lack of correlation [ 37 ]. In contrast, a weakly negative correlation between BIVA and USG has been found in divers, which is the opposite of what the authors expected, since such results indicated that the higher the amount of water, the higher the urine density [ 38 ].…”

Section: Discussionmentioning

confidence: 99%

In-Season Longitudinal Hydration/Body Cell Mass Ratio Changes in Elite Rugby Players

Cebrián-Ponce,

Petri,

Izzicupo

et al. 2023

Sports

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Background: Hydration status has a direct role in sports performance. Bioelectrical Impedance Vector Analysis (BIVA) and Urine Specific Gravity (USG) are commonly used to assess hydration. The study aims to identify the sensitivity and relationship between BIVA and USG in a field sports setting. Methods: BIVA and USG measurements were conducted five times throughout one rugby season. 34 elite male rugby players (25.1 ± 4.4 years; 184.0 ± 7.8 cm; 99.9 ± 13.4 kg) were enrolled. Differences over time were tested using one-way repeated measures ANOVA, and Bonferroni’s post-hoc test was applied in pairwise comparisons. Resistance-reactance graphs and Hotelling’s T2 test were used to characterize the sample and to identify bioelectrical changes. A repeated measures correlation test was conducted for BIVA-USG associations. Results: Two clear trends were seen: (1) from July to September, there was a vector shortening and an increase of the phase angle (p < 0.001); and (2) from December to April, there was a vector lengthening and a decrease of the phase angle (p < 0.001). USG reported neither changes nor correlation with BIVA longitudinally (p > 0.05). Vector variations indicated a body fluid gain (especially in the intracellular compartment) and a body cell mass increase during the preseason, suggesting a physical condition and performance improvement. During the last months of the season, the kinetic was the opposite (fluid loss and decreased body cell mass). Conclusions: Results suggested that BIVA is sensitive to physiological changes and a better option than USG for assessing hydration changes during a rugby sports season.

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Hydration assessment among marathoners using urine specific gravity and bioelectrical impedance analysis

Cited by 11 publications

References 26 publications

Bioelectrical impedance changes of the trunk are opposite the limbs following acute hydration change

Bioelectrical impedance changes of the trunk are opposite the limbs following acute hydration change

Evaluation of volume status in a prehospital setting by ultrasonographic measurement of inferior vena cava and aorta diameters

In-Season Longitudinal Hydration/Body Cell Mass Ratio Changes in Elite Rugby Players

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