Ad Libitum Fluid Intake Does Not Prevent Dehydration in Suboptimally Hydrated Young Soccer Players During a Training Session of a Summer Camp

2013 ◽  
Vol 23 (3) ◽  
pp. 245-251 ◽  
Author(s):  
Giannis Arnaoutis ◽  
Stavros A. Kavouras ◽  
Yiannis P. Kotsis ◽  
Yiannis E. Tsekouras ◽  
Michalis Makrillos ◽  
...  
Keyword(s):  
Body Weight ◽  
Training Session ◽  
Young Male ◽  
Weather Conditions ◽  
Total Body Weight ◽  
Soccer Players ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Ad Libitum ◽  
Total Body

There is a lack of studies concerning hydration status of young athletes exercising in the heat.Purpose:To assess preexercise hydration status in young soccer players during a summer sports camp and to evaluate bodywater balance after soccer training sessions.Methods:Initial hydration status was assessed in 107 young male soccer players (age 11–16 yr) during the 2nd day of the camp. Seventy-two athletes agreed to be monitored during 2 more training sessions (3rd and 5th days of the camp) to calculate dehydration via changes in body weight, while water drinking was allowed ad libitum. Hydration status was assessed via urine specific gravity (USG), urine color, and changes in total body weight. Mean environmental temperature and humidity were 27.2 ± 2 °C and 57% ± 9%, respectively.Results:According to USG values, 95 of 107 of the players were hypohydrated (USG ≥ 1.020) before practice. The prevalence of dehydration observed was maintained on both days, with 95.8% and 97.2% of the players being dehydrated after the training sessions on the 3rd and 5th days, respectively. Despite fluid availability, 54 of the 66 (81.8%) dehydrated players reduced their body weight (–0.35 ± 0.04 kg) as a response to training, while 74.6% (47 out of the 63) further reduced their body weight (–0.22 ± 0.03 kg) after training on the 5th day.Conclusion:Approximately 90% of the young soccer players who began exercising under warm weather conditions were hypohydrated, while drinking ad libitum during practice did not prevent further dehydration in already dehydrated players.

scholarly journals Pre-Training Hydration Status of Well- Trained Soccer Players in Moderate Temperature Autumn and Cool Winter

2018 ◽  
Vol 4 (95) ◽  
Author(s):  
Lilita Voitkevica ◽  
Inese Pontaga ◽  
Saima Timpmann ◽  
Vahur Ööpik
Keyword(s):  
Total Body Water ◽  
Training Session ◽  
Body Water ◽  
Moderate Temperature ◽  
Soccer Players ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Cold Winter ◽  
Related Factors ◽  
Total Body

Background.  Pre-training  hydration  status  is  considered  a  factor  influencing  efficacy  of  training.  Research literature  does  not  contain  data  regarding  the  potential  impact  of  natural  alternation  of  seasons  on  pre-training hydration status in athletes. The purpose of this study was to assess and compare pre-training hydration status in well-trained male soccer (football) players in moderate temperate autumn and cold winter.Methods. Research participants were 57 male soccer players from two Latvian First League teams, who were studied prior to their ordinary training session. Participants provided a midstream urine sample for analysis of urine specific gravity (USG), and their body mass (kg), body fat percentage and total body water percentage were measured. Results. Pre-training hydration status did not differ in moderate temperature autumn (mean USG 1.020 ± 0.010; mean total body water 64.2 ± 2.9%) in cold winter (mean USG 1.020 ± 0.008; mean total body water 64.8 ± 2.7%; for both parameters p > .05). Prevalence of hypohydration and serious hypohydration (defined as USG 1.021 – 1.030 and USG > 1.030, respectively) was similar in moderate temperate autumn (47.4%) and cold winter (60%), (χ 2  = 1.50; p > .05). Significant correlation between the within-subject USG values measured in moderate temperate and cold environment was observed (r = .60, p = .009). Conclusion. In well-trained soccer players pre-training hydration status does not differ in moderate temperature autumn and cold winter. Individual-related factors such as nutritional behaviour (including pattern of voluntary fluid intake) may have stronger impact on hydration status than environment-related factors like natural alternation of  seasons.Keywords: hydration status, football, environmental temperature, autumn, winter.

INFLUENCE OF DIET COMPOSITION AND CALORIC INTAKE ON BODY WEIGHT OF WARM- AND COLD-ACCLIMATED RATS

1963 ◽  
Vol 41 (1) ◽  
pp. 2225-2235
Author(s):  
A. DesMarais ◽  
P. A. Lachance
Keyword(s):  
Body Weight ◽  
Body Fat ◽  
Total Body Weight ◽  
Lean Body Weight ◽  
High Fat ◽  
High Carbohydrate ◽  
Exposure To Cold ◽  
Total Body Fat ◽  
Ad Libitum ◽  
Total Body

The well known reduction in growth rate of cold-acclimated rats has been shown to depend on a decreased gain in total body fat, without change in the gain in lean body weight. This has been observed in rats fed Lab Chow or a high-fat diet ad libitum. In those groups fed a high-carbohydrate diet ad libitum or calorie-restricted high-fat or high-carbohydrate diets, exposure to cold had no effect on the gain in neither total body weight nor lean body weight, which were already reduced by the diet; in those animals, the significant decrease in the gain in total body fat upon exposure to cold was compensated by a slight but unsignificant increase in the gain in lean body weight, so that differences in gain in total body weight were not significant.

STUDIES ON THE EFFECT OF HORMONE ADMINISTRATION ON BODY WEIGHT AND ON TIBIAL EPIPHYSIAL CARTILAGE WIDTH IN INTACT, HYPOPHYSECTOMIZED AND ADRENALECTOMIZED RATS

1963 ◽  
Vol 25 (4) ◽  
pp. 473-482 ◽  
Author(s):  
HELEN E. C. CARGILL THOMPSON ◽  
G. P. CREAN
Keyword(s):  
Growth Hormone ◽  
Body Weight ◽  
Young Male ◽  
Total Body Weight ◽  
Male Rats ◽  
Unilateral Nephrectomy ◽  
Hormone Administration ◽  
Epiphysial Cartilage ◽  
Hypophysectomized Rats ◽  
Total Body

SUMMARY 1. The effects of feeding, hormone administration, unilateral nephrectomy and adrenalectomy on width of tibial cartilage and total body weight in intact and hypophysectomized young male rats were measured. 2. Unilateral nephrectomy and adrenalectomy have no effect on the cartilage width of both intact and hypophysectomized rats, although adrenalectomy causes a loss in weight in the intact rat. 3. Intact rats, both young and adult, fed enough to maintain but not to put on weight, show a reduction of cartilage width to hypophysectomized levels. 4. Growth hormone alone (1 mg. and 3 mg./day for 14 days) causes a marked increase in cartilage width but only a 50–60% increase in total body weight in the hypophysectomized rat. 5. Adrenocorticotrophin (ACTH: 2 i.u./day for 14 days) causes a significant reduction in both cartilage width and total body weight in the hypophysectomized rat. 6. Thyrotrophin (TSH: 1 i.u./day) and Prolactin (1 mg. and 2 mg./day) caused significant increases in both total body weight and cartilage width in the hypophysectomized rat. 7. Luteinizing hormone (LH: 0·01 mg./day) together with follicle stimulating hormone (FSH: 1·0 mg./day) caused a significant increase in body weight, but had no effect on cartilage width in the hypophysectomized rat. 8. Both doses of combined hormones (growth hormone, ACTH, TSH, prolactin, FSH and LH administered together) caused a marked increase in cartilage width and a smaller increase in total body weight in the hypophysectomized rat.

THE SIGNIFICANCE OF THE REDUCED FEED CONSUMPTION OBSERVED IN GROWING PIGS FED VOMITOXIN-CONTAMINATED DIETS

1986 ◽  
Vol 66 (1) ◽  
pp. 277-287 ◽  
Author(s):  
E. R. CHAVEZ ◽  
J. A. RHEAUME
Keyword(s):  
Body Weight ◽  
Control Diet ◽  
Total Body Weight ◽  
Growing Pigs ◽  
Feed Consumption ◽  
Control Analysis ◽  
Weight Gains ◽  
Ad Libitum ◽  
Total Body ◽  
Dietary Treatments

Feeding trials were conducted to determine the significance of the reduction in feed consumption observed when growing pigs were fed complete diets containing approximately 6 ppm vomitoxin. Sixty Landrace weaners, weighing on average 22 kg, were randomly assigned to four dietary treatments. The dietary treatments were: (1) control cereal soybean diet fed ad libitum (mycotoxin free); (2) vomitoxin diet fed ad libitum in which 100% of the clean wheat included in the control diet was replaced by moldy wheat containing 10.32 ppm vomitoxin; (3) control diet fed restricted to the average daily intake of pigs fed the vomitoxin diet; and (4) upgraded vomitoxin diet fed ad libitum and containing approximately 20% more energy, crude protein, minerals and vitamins. Individual feed consumption was recorded daily for 12 wk. The control diet promoted significantly (P < 0.05) greater total body weight gains and also the greatest feed consumption. Body weight gains were not different (P > 0.05) for the vomitoxin and restricted control dietary treatments. The vomitoxin upgraded treatment resulted in greater total body weight gains (P < 0.05) than the vomitoxin treatment. During the 12-wk period, animals in the vomitoxin and restricted-control-fed groups consumed 71% as much feed as the control group fed ad libitum while the vomitoxin upgraded group consumed 77% as much as the control. Analysis for blood urea nitrogen, creatinine, plasma protein and alkaline phosphatase revealed no differences (P > 0.05) between dietary treatments. With respect to animal performance and blood biochemical profiles, the effect of vomitoxin appears to be primarily limited to feed acceptability and intake, with no apparent consequences on the metabolic function of the animal. Key words: Vomitoxin, deoxynivalenol, growing pigs, feed consumption

scholarly journals FLUID BALANCE DURING TAEKWONDO TRAINING

2021 ◽  
Vol 27 (1) ◽  
pp. 70-74
Author(s):  
Felipe Gomes Belfort ◽  
Paulo Roberto dos Santos Amorim ◽  
Carlos Enrique Silva ◽  
Cassia Farias Fernandes Gonçalves ◽  
Priscila Rita Niquini ◽  
...  
Keyword(s):  
Water Intake ◽  
Training Session ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Fluid Loss ◽  
Level Of Evidence ◽  
Warm Up ◽  
Significant Difference ◽  
Before And After ◽  
Ad Libitum

ABSTRACT Introduction Dehydration has been described as one of the main factors of reduced performance in combat sports activities, leading to death in extreme cases. Objective To investigate the pre-training hydration status and changes in fluid homeostasis during two taekwondo training sessions. Methods Eighteen male college athletes (age 22.6 ± 3.37 years) were assessed. The study design aimed to reproduce the conditions of a 90-minute taekwondo training session, divided into three stages: a) warm-up exercises (20 min); b) poomsae (30 min) and c) technical training (40 min). The athletes had ad libitum water intake during training. To assess the hydration status we considered body mass (BM), the amount of liquid consumed and urine output, which enabled us to establish absolute and relative fluid loss in kg and percentage as well as the sweating rate. We also considered urine specific gravity (USG), urine color (U-COL), and subjective sensation of thirst (Sthirst) before and after the training session. Pre- and post-training results were compared separately in each session and between sessions. Results There was a significant difference (P<0.05) in pre-training BM between the two days of training. There was a significant difference (P<0.05) in the final BM on both days of the experiment. Most subjects had relative dehydration below 2%. A significant difference (P<0.05) was recorded pre and post training for U-COL and Sthirst, with the highest rates obtained at the end of each session. Participants always started training at a low dehydration status (USG >1,020g.ml-1). Conclusions The athletes tended to start the training sessions in dehydration status, which increases over the course of the training. Ad libitum water intake was not sufficient to balance fluid loss. Changes in fluid levels between sessions were similar. Level of Evidence II; Therapeutic Studies Investigating the Results Level of Treatment.

scholarly journals Hydration Status in Adolescent Alpine Skiers During a Training Camp

2021 ◽  
Vol 79 (1) ◽  
pp. 55-63
Author(s):  
Dirk Aerenhouts ◽  
Laurent Chapelle ◽  
Peter Clarys ◽  
Evert Zinzen
Keyword(s):  
Specific Gravity ◽  
Fluid Intake ◽  
Training Session ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Fluid Loss ◽  
Individual Values ◽  
Training Camp ◽  
Ad Libitum ◽  
Alpine Skiers

Abstract Maintaining euhydration is important for optimal health, performance and recovery, but can be challenging for alpine skiers when training in a relatively cold but dry environment. This study aimed to evaluate hydration status, fluid loss and fluid intake in adolescent alpine skiers during a training camp. Twelve athletes aged 14.3 ± 0.9 years volunteered to participate in the study. Athletes resided at an altitude of 1600 m and trained between 1614 and 2164 m. During eight consecutive days, urine specific gravity was measured before each morning training session using a refractometer. Changes in body weight representing fluid loss and ad libitum fluid intake during each morning training session were assessed using a precision scale. Mean pre-training urine specific gravity remained stable throughout the training camp. Individual values ranged between 1.010 and 1.028 g/cm3with 50 to 83% of athletes in a hypohydrated state (urine specific gravity ≥ 1.020 g/cm3). Mean training induced fluid loss remained stable throughout the training camp (range -420 to -587 g) with individual losses up to 1197 g (-3.5%). Fluid intake was significantly lower than fluid loss during each training session. To conclude, urine specific gravity values before training indicated insufficient daily fluid intake in more than half of the athletes. Furthermore, fluid intake during training in adolescent alpine skiers was suboptimal even when drinks were provided ad libitum. Coaches and athletes should be encouraged to carefully monitor hydration status and to ensure that alpine skiers drink sufficiently during and in between training sessions.

INFLUENCE OF DIET COMPOSITION AND CALORIC INTAKE ON BODY WEIGHT OF WARM- AND COLD-ACCLIMATED RATS

1963 ◽  
Vol 41 (11) ◽  
pp. 2225-2235
Author(s):  
A. DesMarais ◽  
P. A. Lachance
Keyword(s):  
Body Weight ◽  
Body Fat ◽  
Total Body Weight ◽  
Lean Body Weight ◽  
High Fat ◽  
High Carbohydrate ◽  
Exposure To Cold ◽  
Total Body Fat ◽  
Ad Libitum ◽  
Total Body

The well known reduction in growth rate of cold-acclimated rats has been shown to depend on a decreased gain in total body fat, without change in the gain in lean body weight. This has been observed in rats fed Lab Chow or a high-fat diet ad libitum. In those groups fed a high-carbohydrate diet ad libitum or calorie-restricted high-fat or high-carbohydrate diets, exposure to cold had no effect on the gain in neither total body weight nor lean body weight, which were already reduced by the diet; in those animals, the significant decrease in the gain in total body fat upon exposure to cold was compensated by a slight but unsignificant increase in the gain in lean body weight, so that differences in gain in total body weight were not significant.

scholarly journals Association between hydration status, hydration knowledge and fluid consumption during training among soccer players

2018 ◽  
Vol 23 (1) ◽  
pp. 23-29
Author(s):  
N. Jusoh ◽  
S. Salim
Keyword(s):  
Fluid Intake ◽  
Pearson Correlation ◽  
Training Session ◽  
Soccer Players ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Sweat Loss ◽  
Pearson Correlation Test ◽  
Colour Chart ◽  
Urine Colour

Study Aim: The purpose of this study was to determine the correlation between hydration status, knowledge of hydration and the amount of fluid intake consumption during training among the soccer players. Material and Methods: Pre-training hydration status was measured by urine colour chart and Urine Specific Gravity (USG). A questionnaire on hydration knowledge was answered by the participants on the last day of training session. Pearson Correlation test was used to analyse the correlation between hydration status, knowledge of hydration and total amount of fluid intake among the participants. Results: The results showed that the participants were dehydrated during the three days of training. Sixty four percent of the participants had a satisfactory knowledge of hydration. However, the results indicated that the sweat loss was higher than fluid intake during the training. Pearson test revealed there were positive correlation between USG and urine colour (r=0.809, p<0.001) as well as urine colour and fluid intake (r = .424, p<0.05). Conclusions: In conclusion, the findings indicate the needs to increase awareness of pre training hydration status among the participants.

scholarly journals Lean body weight versus total body weight to calculate the iodinated contrast media volume in abdominal CT: a randomised controlled trial

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Moreno Zanardo ◽  
Fabio Martino Doniselli ◽  
Anastassia Esseridou ◽  
Massimiliano Agrò ◽  
Nicol Antonina Rita Panarisi ◽  
...  
Keyword(s):  
Body Weight ◽  
Contrast Media ◽  
Controlled Trial ◽  
Total Body Weight ◽  
Lean Body Weight ◽  
Iodinated Contrast Media ◽  
Abdominal Ct ◽  
Iodinated Contrast ◽  
Significant Difference ◽  
Total Body

Abstract Objectives Iodinated contrast media (ICM) could be more appropriately dosed on patient lean body weight (LBW) than on total body weight (TBW). Methods After Ethics Committee approval, trial registration NCT03384979, patients aged ≥ 18 years scheduled for multiphasic abdominal CT were randomised for ICM dose to LBW group (0.63 gI/kg of LBW) or TBW group (0.44 gI/kg of TBW). Abdominal 64-row CT was performed using 120 kVp, 100–200 mAs, rotation time 0.5 s, pitch 1, Iopamidol (370 mgI/mL), and flow rate 3 mL/s. Levene, Mann–Whitney U, and χ2 tests were used. The primary endpoint was liver contrast enhancement (LCE). Results Of 335 enrolled patients, 17 were screening failures; 44 dropped out after randomisation; 274 patients were analysed (133 LBW group, 141 TBW group). The median age of LBW group (66 years) was slightly lower than that of TBW group (70 years). Although the median ICM-injected volume was comparable between groups, its variability was larger in the former (interquartile range 27 mL versus 21 mL, p = 0.01). The same was for unenhanced liver density (IQR 10 versus 7 HU) (p = 0.02). Median LCE was 40 (35–46) HU in the LBW group and 40 (35–44) HU in the TBW group, without significant difference for median (p = 0.41) and variability (p = 0.23). Suboptimal LCE (< 40 HU) was found in 64/133 (48%) patients in the LBW group and 69/141 (49%) in the TBW group, but no examination needed repeating. Conclusions The calculation of the ICM volume to be administered for abdominal CT based on the LBW does not imply a more consistent LCE.

scholarly journals Pre-Practice Hydration Status in Soccer (Football) Players in a Cool Environment

Medicina ◽  
2018 ◽  
Vol 54 (6) ◽  
pp. 102
Author(s):  
Urmo Kiitam ◽  
Lilita Voitkevica ◽  
Saima Timpmann ◽  
Inese Pontaga ◽  
Jaan Ereline ◽  
...  
Keyword(s):  
Athletic Trainers ◽  
Training Session ◽  
Urine Specific Gravity ◽  
Hydration Status ◽  
Football Players ◽  
Sample Collection ◽  
Training Experience ◽  
Cool Environment ◽  
Daily Training ◽  
Soccer Training

Background and Objectives: Only a few studies have reported the pre-practice hydration status in soccer players (SPs) who train in a cool climate. The primary purpose of this study was to examine the hydration status of male semiprofessional SPs immediately before their regular training session in winter. The secondary purpose was to compare the urinary indices of the hydration status of Estonian and Latvian SPs. Materials and Methods: Pre-training urine samples were collected from 40 Estonian (age 22.1 ± 3.4 years, soccer training experience 13.7 ± 3.9 years) and 41 Latvian (age 20.8 ± 3.4 years, soccer training experience 13.3 ± 3.0 years) SPs and analyzed for urine specific gravity (USG). The average outdoor temperature during the sample collection period (January–March) was between −5.1 °C and 0.2 °C (Estonia) and −1.9 °C and −5.0 °C (Latvia). Results: The average pre-training USG of Estonian and Latvian SPs did not differ (P = 0.464). Pooling the data of Estonian and Latvian SPs yielded a mean USG value of 1.021 ± 0.007. Hypohydration (defined as a USG ≥ 1.020) was evident altogether in fifty SPs (61.7%) and one of them had a USG value greater than 1.030. Conclusions: Estonian and Latvian SPs do not differ in respect of USG and the prevalence of pre-training hypohydration is high in this athletic cohort. These findings suggest that SPs as well as their coaches, athletic trainers, and sports physicians should be better educated to recognize the importance of maintaining euhydration during the daily training routine in wintertime and to apply appropriate measures to avoid hypohydration.

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