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Ingestion of sodium plus water improves cardiovascular function and performance during dehydrating cycling in the heat.
Scand J Med Sci Sports. 2014 Jun; 24(3):507-18.SJ

Abstract

We studied if salt and water ingestion alleviates the physiological strain caused by dehydrating exercise in the heat. Ten trained male cyclists (VO2max : 60 ± 7 mL/kg/min) completed three randomized trials in a hot-dry environment (33 °C, 30% rh, 2.5 m/s airflow). Ninety minutes before the exercise, participants ingested 10 mL of water/kg body mass either alone (CON trial) or with salt to result in concentrations of 82 or 164 mM Na(+) (ModNa(+) or HighNa(+) trial, respectively). Then, participants cycled at 63% of VO2 m ⁢ a x for 120 min immediately followed by a time-trial. After 120 min of exercise, the reduction in plasma volume was lessened with ModNa(+) and HighNa(+) trials (-11.9 ± 2.1 and -9.8 ± 4.2%) in comparison with CON (-16.4 ± 3.2%; P < 0.05). However, heat accumulation or dissipation (forearm skin blood flow and sweat rate) were not improved by salt ingestion. In contrast, both salt trials maintained cardiac output (∼ 1.3 ± 1.4 L/min; P < 0.05) and stroke volume (∼ 10 ± 11 mL/beat; P < 0.05) above CON after 120 min of exercise. Furthermore, the salt trials equally improved time-trial performance by 7.4% above CON (∼ 289 ± 42 vs 269 ± 50 W, respectively; P < 0.05). Our data suggest that pre-exercise ingestion of salt plus water maintains higher plasma volume during dehydrating exercise in the heat without thermoregulatory effects. However, it maintains cardiovascular function and improves cycling performance.

Authors+Show Affiliations

Exercise Physiology Laboratory, University of Castilla-La Mancha, Toledo, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23253191

Citation

Hamouti, N, et al. "Ingestion of Sodium Plus Water Improves Cardiovascular Function and Performance During Dehydrating Cycling in the Heat." Scandinavian Journal of Medicine & Science in Sports, vol. 24, no. 3, 2014, pp. 507-18.
Hamouti N, Fernández-Elías VE, Ortega JF, et al. Ingestion of sodium plus water improves cardiovascular function and performance during dehydrating cycling in the heat. Scand J Med Sci Sports. 2014;24(3):507-18.
Hamouti, N., Fernández-Elías, V. E., Ortega, J. F., & Mora-Rodriguez, R. (2014). Ingestion of sodium plus water improves cardiovascular function and performance during dehydrating cycling in the heat. Scandinavian Journal of Medicine & Science in Sports, 24(3), 507-18. https://doi.org/10.1111/sms.12028
Hamouti N, et al. Ingestion of Sodium Plus Water Improves Cardiovascular Function and Performance During Dehydrating Cycling in the Heat. Scand J Med Sci Sports. 2014;24(3):507-18. PubMed PMID: 23253191.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ingestion of sodium plus water improves cardiovascular function and performance during dehydrating cycling in the heat. AU - Hamouti,N, AU - Fernández-Elías,V E, AU - Ortega,J F, AU - Mora-Rodriguez,R, Y1 - 2012/12/17/ PY - 2012/11/03/accepted PY - 2012/12/21/entrez PY - 2012/12/21/pubmed PY - 2015/2/3/medline KW - cardiovascular drift KW - fluid-electrolyte balance KW - plasma volume expansion KW - thermoregulation SP - 507 EP - 18 JF - Scandinavian journal of medicine & science in sports JO - Scand J Med Sci Sports VL - 24 IS - 3 N2 - We studied if salt and water ingestion alleviates the physiological strain caused by dehydrating exercise in the heat. Ten trained male cyclists (VO2max : 60 ± 7 mL/kg/min) completed three randomized trials in a hot-dry environment (33 °C, 30% rh, 2.5 m/s airflow). Ninety minutes before the exercise, participants ingested 10 mL of water/kg body mass either alone (CON trial) or with salt to result in concentrations of 82 or 164 mM Na(+) (ModNa(+) or HighNa(+) trial, respectively). Then, participants cycled at 63% of VO2 m ⁢ a x for 120 min immediately followed by a time-trial. After 120 min of exercise, the reduction in plasma volume was lessened with ModNa(+) and HighNa(+) trials (-11.9 ± 2.1 and -9.8 ± 4.2%) in comparison with CON (-16.4 ± 3.2%; P < 0.05). However, heat accumulation or dissipation (forearm skin blood flow and sweat rate) were not improved by salt ingestion. In contrast, both salt trials maintained cardiac output (∼ 1.3 ± 1.4 L/min; P < 0.05) and stroke volume (∼ 10 ± 11 mL/beat; P < 0.05) above CON after 120 min of exercise. Furthermore, the salt trials equally improved time-trial performance by 7.4% above CON (∼ 289 ± 42 vs 269 ± 50 W, respectively; P < 0.05). Our data suggest that pre-exercise ingestion of salt plus water maintains higher plasma volume during dehydrating exercise in the heat without thermoregulatory effects. However, it maintains cardiovascular function and improves cycling performance. SN - 1600-0838 UR - https://www.unboundmedicine.com/medline/citation/23253191/Ingestion_of_sodium_plus_water_improves_cardiovascular_function_and_performance_during_dehydrating_cycling_in_the_heat_ L2 - https://doi.org/10.1111/sms.12028 DB - PRIME DP - Unbound Medicine ER -