Comparison of water turnover rates in young swimmers in training and age-matched non-training individuals

John Beattie Leiper, Ronald John Maughan

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Total body water (TBW) and water turnover rates (WTR) of 8 competitive swimmers (SW) and 6 age-matched non-training individuals (CON) were determined using deuterium oxide dilution and elimination. During the 7-day study, individuals in the SW group trained 9 times, swimming on average 42.4 kin, while the CON group did no regular exercise. Water temperature in the swimming pool was between 26 and 29 degreesC during training sessions. Body mass at the beginning and end of the study period remained essentially the same in the SW (67.8 +/- 6.3 kg) and CON (61.1 +/- 8.5 kg) groups. Mean +/- SD TBW of the SW (38.7 +/- 5.6 L) was similar to that of the CON (37.5 +/-8.0 L). Mean WTR was faster in the SW (54 +/- 18 ml (.) kg (.) day(-1)) than the CON (28 +/- 21 ml (.) kg (.) day(-1)). Mean daily urine output was similar in the SW (14 +/- 5 ml (.) kg (.) day(-1)) and CON (14 +/- 3 ml (.) kg (.) day(-1)). Calculated non-renal daily water loss was faster in the SW (41 +/- 21 ml (.) kg (.) day(-1)) than the CON (13 +/- 20 ml (.) kg (.) day(-1)). This study demonstrates that WTR are faster in young swimmers who exercise strenuously in cool water than in non-training individuals and that the difference was due to the approximately 3-times greater non-renal water losses that the exercising group incurred. This suggests that exercise-induced increases in sweat rates are a major factor in water loss in swimmers training in cool water.

    Original languageEnglish
    Pages (from-to)347-357
    Number of pages10
    JournalInternational Journal of Sport Nutrition & Exercise Metabolism
    Volume14
    Issue number3
    Publication statusPublished - 2004

    Keywords

    • body water
    • exercise
    • sweat
    • urination
    • BODY-WATER
    • ENERGY-EXPENDITURE
    • HIGH-ALTITUDE
    • RESPONSES
    • IMMERSION
    • EXERCISE
    • SEDENTARY
    • BALANCE
    • RUNNERS
    • VOLUME

    Cite this

    Comparison of water turnover rates in young swimmers in training and age-matched non-training individuals. / Leiper, John Beattie; Maughan, Ronald John.

    In: International Journal of Sport Nutrition & Exercise Metabolism, Vol. 14, No. 3, 2004, p. 347-357.

    Research output: Contribution to journalArticle

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    N2 - Total body water (TBW) and water turnover rates (WTR) of 8 competitive swimmers (SW) and 6 age-matched non-training individuals (CON) were determined using deuterium oxide dilution and elimination. During the 7-day study, individuals in the SW group trained 9 times, swimming on average 42.4 kin, while the CON group did no regular exercise. Water temperature in the swimming pool was between 26 and 29 degreesC during training sessions. Body mass at the beginning and end of the study period remained essentially the same in the SW (67.8 +/- 6.3 kg) and CON (61.1 +/- 8.5 kg) groups. Mean +/- SD TBW of the SW (38.7 +/- 5.6 L) was similar to that of the CON (37.5 +/-8.0 L). Mean WTR was faster in the SW (54 +/- 18 ml (.) kg (.) day(-1)) than the CON (28 +/- 21 ml (.) kg (.) day(-1)). Mean daily urine output was similar in the SW (14 +/- 5 ml (.) kg (.) day(-1)) and CON (14 +/- 3 ml (.) kg (.) day(-1)). Calculated non-renal daily water loss was faster in the SW (41 +/- 21 ml (.) kg (.) day(-1)) than the CON (13 +/- 20 ml (.) kg (.) day(-1)). This study demonstrates that WTR are faster in young swimmers who exercise strenuously in cool water than in non-training individuals and that the difference was due to the approximately 3-times greater non-renal water losses that the exercising group incurred. This suggests that exercise-induced increases in sweat rates are a major factor in water loss in swimmers training in cool water.

    AB - Total body water (TBW) and water turnover rates (WTR) of 8 competitive swimmers (SW) and 6 age-matched non-training individuals (CON) were determined using deuterium oxide dilution and elimination. During the 7-day study, individuals in the SW group trained 9 times, swimming on average 42.4 kin, while the CON group did no regular exercise. Water temperature in the swimming pool was between 26 and 29 degreesC during training sessions. Body mass at the beginning and end of the study period remained essentially the same in the SW (67.8 +/- 6.3 kg) and CON (61.1 +/- 8.5 kg) groups. Mean +/- SD TBW of the SW (38.7 +/- 5.6 L) was similar to that of the CON (37.5 +/-8.0 L). Mean WTR was faster in the SW (54 +/- 18 ml (.) kg (.) day(-1)) than the CON (28 +/- 21 ml (.) kg (.) day(-1)). Mean daily urine output was similar in the SW (14 +/- 5 ml (.) kg (.) day(-1)) and CON (14 +/- 3 ml (.) kg (.) day(-1)). Calculated non-renal daily water loss was faster in the SW (41 +/- 21 ml (.) kg (.) day(-1)) than the CON (13 +/- 20 ml (.) kg (.) day(-1)). This study demonstrates that WTR are faster in young swimmers who exercise strenuously in cool water than in non-training individuals and that the difference was due to the approximately 3-times greater non-renal water losses that the exercising group incurred. This suggests that exercise-induced increases in sweat rates are a major factor in water loss in swimmers training in cool water.

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    KW - RESPONSES

    KW - IMMERSION

    KW - EXERCISE

    KW - SEDENTARY

    KW - BALANCE

    KW - RUNNERS

    KW - VOLUME

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