Calcium losses resulting from an acute bout of moderate-intensity exercise

Daryll B. Bullen, Mary L. O'Toole, Karen Johnson

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The purpose of this study was to compare daily calcium (Ca) losses in sweat (S) and urine (U) on an exercise day (E) with losses on the preceding day (i.e., a rest day) during which no exercise (NE) was performed. Ten healthy male volunteers (23.9 ± 32 years) performed a single bout of moderate exercise (running at 80% HRmax) for 45 min in a warm (32 °C, 58% relative humidity) environment on E. When E and NE were compared, neither Ca intake (1,232 ± 714 and 1,148 ± 482 mg, respectively) nor urinary Ca excretion (206 ± 128 and 189 ± 130 mg, respectively) were different (p > .05). Sweat Ca losses during the exercise bout averaged 45 ± 12 mg. The results indicate that, although a small amount of Ca is lost in sweat during 45 min of moderate-intensity exercise, measured (sweat and urine losses combined) Ca losses (251 ± 128 and 189 ± 130 mg) were not different (p > .05) between days (E and NE, respectively). These data suggest that moderate exercise for up to 45 min in a warm, humid environment does not markedly increase Ca intake requirements.

Original languageEnglish (US)
Pages (from-to)275-284
Number of pages10
JournalInternational Journal of Sport Nutrition
Volume9
Issue number3
DOIs
StatePublished - Jan 1 1999

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exercise
Exercise
Calcium
calcium
sweat
Sweat
urine
Urine
Humidity
Running
volunteers
Healthy Volunteers
relative humidity
excretion

All Science Journal Classification (ASJC) codes

  • Food Science
  • Medicine (miscellaneous)
  • Endocrinology
  • Public Health, Environmental and Occupational Health

Cite this

Calcium losses resulting from an acute bout of moderate-intensity exercise. / Bullen, Daryll B.; O'Toole, Mary L.; Johnson, Karen.

In: International Journal of Sport Nutrition, Vol. 9, No. 3, 01.01.1999, p. 275-284.

Research output: Contribution to journalArticle

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