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Fluid balance and sodium losses during indoor tennis match play.
Int J Sport Nutr Exerc Metab 2011; 21(6):492-500IJ

Abstract

This study assessed fluid balance, sodium losses, and effort intensity during indoor tennis match play (17 ± 2 °C, 42% ± 9% relative humidity) over a mean match duration of 68.1 ± 12.8 min in 16 male tennis players. Ad libitum fluid intake was recorded throughout the match. Sweat loss from change in nude body mass; sweat electrolyte content from patches applied to the forearm, calf, and thigh, and back of each player; and electrolyte balance derived from sweat, urine, and daily food-intake analysis were measured. Effort intensity was assessed from on-court heart rate compared with data obtained during a maximal treadmill test. Sweat rate (M ± SD) was 1.1 ± 0.4 L/hr, and fluid-ingestion rate was 1.0 ± 0.6 L/hr (replacing 93% ± 47% of fluid lost), resulting in only a small mean loss in body mass of 0.15% ± 0.74%. Large interindividual variabilities in sweat rate (range 0.3-2.0 L/hr) and fluid intake (range 0.31-2.52 L/hr) were noted. Whole-body sweat sodium concentration was 38 ± 12 mmol/L, and total sodium losses during match play were 1.1 ± 0.4 g (range 0.5-1.8 g). Daily sodium intake was 2.8 ± 1.1 g. Indoor match play largely consisted of low-intensity exercise below ventilatory threshold (mean match heart rate was 138 ± 24 beats/min). This study shows that in moderate indoor temperature conditions players ingest sufficient fluid to replace sweat losses. However, the wide range in data obtained highlights the need for individualized fluid-replacement guidance.

Authors+Show Affiliations

School of Sport, University of Stirling, Stirling, Scotland.No affiliation info available

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

22089307

Citation

Lott, Matthew J E., and Stuart D R. Galloway. "Fluid Balance and Sodium Losses During Indoor Tennis Match Play." International Journal of Sport Nutrition and Exercise Metabolism, vol. 21, no. 6, 2011, pp. 492-500.
Lott MJ, Galloway SD. Fluid balance and sodium losses during indoor tennis match play. Int J Sport Nutr Exerc Metab. 2011;21(6):492-500.
Lott, M. J., & Galloway, S. D. (2011). Fluid balance and sodium losses during indoor tennis match play. International Journal of Sport Nutrition and Exercise Metabolism, 21(6), pp. 492-500.
Lott MJ, Galloway SD. Fluid Balance and Sodium Losses During Indoor Tennis Match Play. Int J Sport Nutr Exerc Metab. 2011;21(6):492-500. PubMed PMID: 22089307.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fluid balance and sodium losses during indoor tennis match play. AU - Lott,Matthew J E, AU - Galloway,Stuart D R, PY - 2011/11/18/entrez PY - 2011/11/18/pubmed PY - 2012/4/20/medline SP - 492 EP - 500 JF - International journal of sport nutrition and exercise metabolism JO - Int J Sport Nutr Exerc Metab VL - 21 IS - 6 N2 - This study assessed fluid balance, sodium losses, and effort intensity during indoor tennis match play (17 ± 2 °C, 42% ± 9% relative humidity) over a mean match duration of 68.1 ± 12.8 min in 16 male tennis players. Ad libitum fluid intake was recorded throughout the match. Sweat loss from change in nude body mass; sweat electrolyte content from patches applied to the forearm, calf, and thigh, and back of each player; and electrolyte balance derived from sweat, urine, and daily food-intake analysis were measured. Effort intensity was assessed from on-court heart rate compared with data obtained during a maximal treadmill test. Sweat rate (M ± SD) was 1.1 ± 0.4 L/hr, and fluid-ingestion rate was 1.0 ± 0.6 L/hr (replacing 93% ± 47% of fluid lost), resulting in only a small mean loss in body mass of 0.15% ± 0.74%. Large interindividual variabilities in sweat rate (range 0.3-2.0 L/hr) and fluid intake (range 0.31-2.52 L/hr) were noted. Whole-body sweat sodium concentration was 38 ± 12 mmol/L, and total sodium losses during match play were 1.1 ± 0.4 g (range 0.5-1.8 g). Daily sodium intake was 2.8 ± 1.1 g. Indoor match play largely consisted of low-intensity exercise below ventilatory threshold (mean match heart rate was 138 ± 24 beats/min). This study shows that in moderate indoor temperature conditions players ingest sufficient fluid to replace sweat losses. However, the wide range in data obtained highlights the need for individualized fluid-replacement guidance. SN - 1543-2742 UR - https://www.unboundmedicine.com/medline/citation/22089307/Fluid_balance_and_sodium_losses_during_indoor_tennis_match_play_ L2 - https://medlineplus.gov/exerciseandphysicalfitness.html DB - PRIME DP - Unbound Medicine ER -