Comparison of milk, sports drink and water in rehydrating rugby players
This study was carried out to assess the effectiveness of milk (M), sodium added milk (Na+M), sports drink (SD) and water (W) for restoring fluid balance after exerciseinduced dehydration among 25 UPM rugby players. It also compared the after-effects of consuming all these drinks after exercise-i...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/77484/1/FPP%202018%2043%20ir.pdf |
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| Summary: | This study was carried out to assess the effectiveness of milk (M), sodium added milk
(Na+M), sports drink (SD) and water (W) for restoring fluid balance after exerciseinduced
dehydration among 25 UPM rugby players. It also compared the after-effects
of consuming all these drinks after exercise-induced dehydration. A randomized
crossover counterbalanced designed was utilized to compare the after-effects of
consuming the four previously mentioned fluids after running on a threadmill
intermittently in a hot and humid environment to lose 1.7 + 0.1% of body mass (BM).
Drinking commenced 20 min after the end of exercise and participants drank M,
Na+M, SD, or W equivalent to 150% of their BM lost. Urine samples were collected to
assess fluid balance. Participants were also asked to rate the after-effects experienced.
Urine excretion over the recovery period did not change much during the M and Na+M
trials whereas there was a marked increase in output between 1h and 2h after drinking
water and sports drink. Cumulative urine output was significantly less (p = 0.0001)
after the consumption of M (817.35 + 327.16 ml) and Na+M (642.78 + 316.30 ml)
compared to W (1410.04 + 525.25 ml) and SD (1162.70 + 378.92 ml). Subjects
remained in net positive fluid balance (euhydrated) throughout the recovery period
after drinking M and Na+M but returned to net negative fluid balance 1h after drinking
the other drinks; SD and W. However, participants experienced more stomach
pain/discomfort and diarrhoea after M (48%) and Na+M (68%) consumption, while the
consumption of SD and W did not seem to induce diarrhoea. The results suggest that
sports drinks may be a more effective post-exercise rehydration drink for Asian
athletes as the higher frequency of lactose intolerance after milk intake may affect the
state of fluid balance. Sodium added milk can be considered for use after exercise by
athletes accustomed to drinking milk or for those who are able to tolerate lactose
intake. |
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