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Carbohydrate supplementation stabilises plasma sodium during training with high intensity.
Eur J Appl Physiol. 2016 Sep; 116(9):1841-53.EJ

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.

Authors+Show Affiliations

Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany. maik-g-schrader@gmx.de.Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany.Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany.Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany. Institute of Sports Science, Leibniz University Hannover, Am Moritzwinkel 6, 30167, Hannover, Germany.Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany. Institute of Sports Science, Leibniz University Hannover, Am Moritzwinkel 6, 30167, Hannover, Germany.Data Input, Lindenberg 7, 82343, Pöcking, Germany.Institute of Sports Medicine, Hannover Medical School, Carl-Neuberg-Str.1, 30625, Hannover, Germany. Institute of Sports Science, Leibniz University Hannover, Am Moritzwinkel 6, 30167, Hannover, Germany.

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

27465126

Citation

Schrader, M, et al. "Carbohydrate Supplementation Stabilises Plasma Sodium During Training With High Intensity." European Journal of Applied Physiology, vol. 116, no. 9, 2016, pp. 1841-53.
Schrader M, Treff B, Sandholtet T, et al. Carbohydrate supplementation stabilises plasma sodium during training with high intensity. Eur J Appl Physiol. 2016;116(9):1841-53.
Schrader, M., Treff, B., Sandholtet, T., Maassen, N., Shushakov, V., Kaesebieter, J., & Maassen, M. (2016). Carbohydrate supplementation stabilises plasma sodium during training with high intensity. European Journal of Applied Physiology, 116(9), 1841-53. https://doi.org/10.1007/s00421-016-3429-4
Schrader M, et al. Carbohydrate Supplementation Stabilises Plasma Sodium During Training With High Intensity. Eur J Appl Physiol. 2016;116(9):1841-53. PubMed PMID: 27465126.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Carbohydrate supplementation stabilises plasma sodium during training with high intensity. AU - Schrader,M, AU - Treff,B, AU - Sandholtet,T, AU - Maassen,N, AU - Shushakov,V, AU - Kaesebieter,J, AU - Maassen,M, Y1 - 2016/07/27/ PY - 2016/02/16/received PY - 2016/07/05/accepted PY - 2016/7/29/entrez PY - 2016/7/29/pubmed PY - 2017/2/15/medline KW - Carbohydrate supplementation KW - Hydration status KW - Hyponatremia KW - Intermittent exercise SP - 1841 EP - 53 JF - European journal of applied physiology JO - Eur J Appl Physiol VL - 116 IS - 9 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. SN - 1439-6327 UR - https://www.unboundmedicine.com/medline/citation/27465126/Carbohydrate_supplementation_stabilises_plasma_sodium_during_training_with_high_intensity_ L2 - https://dx.doi.org/10.1007/s00421-016-3429-4 DB - PRIME DP - Unbound Medicine ER -