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Effects of athletes’ muscle mass on urinary markers of hydration status
To determine if athletes’ muscle mass affects the usefulness of urine specific gravity ( U sg ) as a hydration index. Nine rugby players and nine endurance runners differing in the amount of muscle mass (42 ± 6 vs. 32 ± 3 kg, respectively; P = 0.0002) were recruited. At waking during six consecutiv...
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| Published in: | European journal of applied physiology 2010-05, Vol.109 (2), p.213-219 |
|---|---|
| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | To determine if athletes’ muscle mass affects the usefulness of urine specific gravity (
U
sg
) as a hydration index. Nine rugby players and nine endurance runners differing in the amount of muscle mass (42 ± 6 vs. 32 ± 3 kg, respectively;
P
= 0.0002) were recruited. At waking during six consecutive days, urine was collected for
U
sg
analysis, urine osmolality (
U
osm
), electrolytes (
,
and
) and protein metabolites (
U
[Creatinine]
,
U
[Urea]
and
U
[Uric acid]
) concentrations. In addition, fasting blood serum osmolality (
S
osm
) was measured on the sixth day. As averaged during 6 days,
U
sg
(1.021 ± 0.002 vs. 1.016 ± 0.001),
U
osm
(702 ± 56 vs. 554 ± 41 mOsmol kg
−1
H
2
O),
U
[Urea]
(405 ± 36 vs. 302 ± 23 mmol L
−1
) and
U
[Uric acid]
(2.7 ± 0.3 vs. 1.7 ± 0.2 mmol L
−1
) were higher in rugby players than runners (
P
1.020) despite
S
osm
being below 290 mOsmol kg
−1
H
2
O in all participants. A positive correlation was found between muscle mass and urine protein metabolites (
r
= 0.47;
P
= 0.04) and between urine protein metabolites and
U
sg
(
r
= 0.92;
P
|
|---|---|
| ISSN: | 1439-6319 1439-6327 |
| DOI: | 10.1007/s00421-009-1333-x |