Details
| Original language | English |
|---|---|
| Pages (from-to) | 1841-1853 |
| Number of pages | 13 |
| Journal | European Journal of Applied Physiology |
| Volume | 116 |
| Issue number | 9 |
| Early online date | 27 Jul 2016 |
| Publication status | Published - 1 Sept 2016 |
Abstract
Background: Investigations of the effect of beverages containing carbohydrates, only, on the sodium and fluid balance during intermittent exercise of high intensity are rare. Therefore, we compared the effects of water and carbohydrate supplementation on plasma, blood volume, and electrolyte shifts during intermittent exercise. Methods: Ten male subjects performed an intermittent exercise test twice. In one trial, tap water (4 ml/kg/15 min) was consumed (Plac trial). In the other trial, the same amount of water supplemented with maltodextrin to achieve a 9.1 % carbohydrate solution (CHO trial) was ingested. Training schedule: warm-up at 50 % for 15 min. Afterwards, power changed between 100 % of the maximum power from a previous incremental test minus 10 and 10 W for each 30 s. Venous blood was sampled to measure electrolytes, osmolality, [protein], hct, [Lactate], [glucose], [Hb] and catecholamines. Hydration status was evaluated by BIA before and after exercise. Results: After beverage ingestion [glucose] was significantly higher in CHO until the end of the trial. Starting with similar resting values, osmolality increased significantly more during CHO (p = 0.002). PV decreased by 5 % under both conditions, but recovered partly during exercise under Plac (p = 0.002). [Na+] and [Cl−] decreased with Plac during exercise (both p < 0.001) but remained constant during exercise with CHO. Conclusions: Sole carbohydrate supplementation seems to stabilise plasma [Na+]. This cannot be explained simply by a cotransport of glucose and [Na+], because that should lead to a recovery of the blood and plasma volume under CHO. In contrast, this was found during exercise with Plac.
Keywords
- Carbohydrate supplementation, Hydration status, Hyponatremia, Intermittent exercise
ASJC Scopus subject areas
- Medicine(all)
- Orthopedics and Sports Medicine
- Medicine(all)
- Public Health, Environmental and Occupational Health
- Medicine(all)
- Physiology (medical)
Sustainable Development Goals
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In: European Journal of Applied Physiology, Vol. 116, No. 9, 01.09.2016, p. 1841-1853.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Carbohydrate supplementation stabilises plasma sodium during training with high intensity
AU - Schrader, M.
AU - Treff, B.
AU - Sandholtet, T.
AU - Maassen, Norbert
AU - Shushakov, V.
AU - Kaesebieter, J.
AU - Maassen, Mirja
N1 - Publisher Copyright: © 2016, Springer-Verlag Berlin Heidelberg.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - Background: Investigations of the effect of beverages containing carbohydrates, only, on the sodium and fluid balance during intermittent exercise of high intensity are rare. Therefore, we compared the effects of water and carbohydrate supplementation on plasma, blood volume, and electrolyte shifts during intermittent exercise. Methods: Ten male subjects performed an intermittent exercise test twice. In one trial, tap water (4 ml/kg/15 min) was consumed (Plac trial). In the other trial, the same amount of water supplemented with maltodextrin to achieve a 9.1 % carbohydrate solution (CHO trial) was ingested. Training schedule: warm-up at 50 % for 15 min. Afterwards, power changed between 100 % of the maximum power from a previous incremental test minus 10 and 10 W for each 30 s. Venous blood was sampled to measure electrolytes, osmolality, [protein], hct, [Lactate], [glucose], [Hb] and catecholamines. Hydration status was evaluated by BIA before and after exercise. Results: After beverage ingestion [glucose] was significantly higher in CHO until the end of the trial. Starting with similar resting values, osmolality increased significantly more during CHO (p = 0.002). PV decreased by 5 % under both conditions, but recovered partly during exercise under Plac (p = 0.002). [Na+] and [Cl−] decreased with Plac during exercise (both p < 0.001) but remained constant during exercise with CHO. Conclusions: Sole carbohydrate supplementation seems to stabilise plasma [Na+]. This cannot be explained simply by a cotransport of glucose and [Na+], because that should lead to a recovery of the blood and plasma volume under CHO. In contrast, this was found during exercise with Plac.
AB - Background: Investigations of the effect of beverages containing carbohydrates, only, on the sodium and fluid balance during intermittent exercise of high intensity are rare. Therefore, we compared the effects of water and carbohydrate supplementation on plasma, blood volume, and electrolyte shifts during intermittent exercise. Methods: Ten male subjects performed an intermittent exercise test twice. In one trial, tap water (4 ml/kg/15 min) was consumed (Plac trial). In the other trial, the same amount of water supplemented with maltodextrin to achieve a 9.1 % carbohydrate solution (CHO trial) was ingested. Training schedule: warm-up at 50 % for 15 min. Afterwards, power changed between 100 % of the maximum power from a previous incremental test minus 10 and 10 W for each 30 s. Venous blood was sampled to measure electrolytes, osmolality, [protein], hct, [Lactate], [glucose], [Hb] and catecholamines. Hydration status was evaluated by BIA before and after exercise. Results: After beverage ingestion [glucose] was significantly higher in CHO until the end of the trial. Starting with similar resting values, osmolality increased significantly more during CHO (p = 0.002). PV decreased by 5 % under both conditions, but recovered partly during exercise under Plac (p = 0.002). [Na+] and [Cl−] decreased with Plac during exercise (both p < 0.001) but remained constant during exercise with CHO. Conclusions: Sole carbohydrate supplementation seems to stabilise plasma [Na+]. This cannot be explained simply by a cotransport of glucose and [Na+], because that should lead to a recovery of the blood and plasma volume under CHO. In contrast, this was found during exercise with Plac.
KW - Carbohydrate supplementation
KW - Hydration status
KW - Hyponatremia
KW - Intermittent exercise
UR - http://www.scopus.com/inward/record.url?scp=84979986523&partnerID=8YFLogxK
U2 - 10.1007/s00421-016-3429-4
DO - 10.1007/s00421-016-3429-4
M3 - Article
C2 - 27465126
AN - SCOPUS:84979986523
VL - 116
SP - 1841
EP - 1853
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 9
ER -