PMID- 29893591
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20210408
IS  - 1543-2742 (Electronic)
IS  - 1526-484X (Linking)
VI  - 29
IP  - 1
DP  - 2019 Jan 1
TI  - Variability of Body Mass and Urine Specific Gravity in Elite Male Field Hockey 
      Players During a Pre-Olympic Training Camp.
PG  - 46-50
LID - ijsnem.2018-0121 [pii]
LID - 10.1123/ijsnem.2018-0121 [doi]
AB  - This field-based observational study was designed to examine the intraindividual 
      variation of first morning body mass and urine specific gravity (Usg) in male 
      hockey players (n = 22) during a 10-day training camp. It was also designed to 
      evaluate the prevalence and interrelationship of morning hypohydration and 
      postmatch dehydration using Usg and changes in body mass, respectively. Body mass 
      and Usg were measured upon waking; body mass was also measured before and after 
      matches. Individual means, SD, and coefficient of variation (CV) were calculated 
      for morning body mass and Usg using 3, 6, and 8 days. Daily prevalence for 
      euhydration and postmatch dehydration using morning Usg (<1.020) and changes in 
      body mass (>-2%), respectively, were determined. Measurement of morning body mass 
      and Usg for 3 days had low variability (CV < 1%) with no improvement at 6 or 8 
      days. Between 36% and 73% of players were considered euhydrated based on morning 
      Usg. Postmatch body mass was reduced >1% in 50-85% of players, with up to 40% 
      experiencing changes >-2%. Postmatch changes in body mass were unrelated to Usg 
      the subsequent morning. These outcomes can be helpful in establishing criteria 
      for detecting meaningful changes in morning body mass and Usg in similar 
      settings, helping to monitor hydration status in elite male athletes. Despite 
      ample fluid availability and consumption, many players experienced hypohydration 
      and dehydration during the camp, indicating that careful monitoring and an 
      individual fluid replacement approach are warranted in these environments.
FAU - Vescovi, Jason D
AU  - Vescovi JD
AD  - University of Toronto.
FAU - Watson, Greig
AU  - Watson G
AD  - University of Tasmania.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Int J Sport Nutr Exerc Metab
JT  - International journal of sport nutrition and exercise metabolism
JID - 100939812
SB  - IM
OTO - NOTNLM
OT  - dehydration
OT  - hydration
OT  - hypohydration
OT  - individual variation
EDAT- 2018/06/13 06:00
MHDA- 2018/06/13 06:01
CRDT- 2018/06/13 06:00
PHST- 2018/02/20 00:00 [received]
PHST- 2018/05/23 00:00 [accepted]
PHST- 2018/06/13 06:00 [pubmed]
PHST- 2018/06/13 06:01 [medline]
PHST- 2018/06/13 06:00 [entrez]
AID - ijsnem.2018-0121 [pii]
AID - 10.1123/ijsnem.2018-0121 [doi]
PST - ppublish
SO  - Int J Sport Nutr Exerc Metab. 2019 Jan 1;29(1):46-50. doi: 
      10.1123/ijsnem.2018-0121.