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Energy availability discriminates clinical menstrual status in exercising women
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نویسنده
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reed j.l. ,de souza m.j. ,mallinson r.j. ,scheid j.l. ,williams n.i.
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منبع
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journal of the international society of sports nutrition - 2015 - دوره : 12 - شماره : 1
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چکیده
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Background: conditions of low energy availability (ea) (<30kcal/kglbm) have been associated with suppressed metabolic hormones and reductions in lh pulsatility in previously sedentary women during short-term manipulations of energy intake (ei) and exercise energy expenditure (eee) in a controlled laboratory setting. the purpose of this study was to examine if ea,defined as ea = (ei-eee)/kglbm,is associated with disruptions in ovarian function in exercising women. methods: menstrual status was confirmed with daily measures of urinary reproductive metabolites across 1-3 menstrual cycles or 28-day monitoring periods. ea was calculated for exercise days using ei from 3-day diet logs,eee from heart-rate monitors and/or exercise logs for a 7-day period,and body composition from dxa. resting energy expenditure (ree) was measured by indirect calorimetry. total triiodothyronine (tt3) was measured from a fasting blood sample. results: 91 exercising women (23.1 ± 0.5years) were categorized clinically as either exercising amenorrheic (examen,n = 30),exercising oligomenorrheic (exoligo,n = 20) or exercising eumenorrheic (exeumen,n = 41). the eumenorrheic group was further divided into more specific subclinical groups as either exercising ovulatory (exov,n = 20),exercising inconsistent (exincon,n = 13),or exercising anovulatory (exanov,n = 8). an ea threshold of 30kcal/kglbm did not distinguish subclinical menstrual status (χ2 = 0.557,p = 0.46) nor did ea differ across subclinical disturbance groups (p > 0.05). ea was lower in the examen vs. exeumen (30.9 ± 2.4 vs. 36.9 ± 1.7kcal/kglbm,p = 0.04). the ratio of ree/predicted ree was lower in the examen vs. exeumen (0.85 ± 0.02 vs. 0.92 ± 0.01,p = 0.001) as was tt3 (79.6 ± 4.1 vs. 95.3 ± 2.9ng/ml,p = 0.002). conclusions: ea did not differ among subclinical forms of menstrual disturbances in a large sample of exercising women,but ea did discriminate clinical menstrual status,i.e.,amenorrhea from eumenorrhea. © reed et al.
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کلیدواژه
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Dietary energy intake; Energy balance; Exercise training; Females; Resting metabolic rate; Total triiodothyronine
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آدرس
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the pennsylvania state university,department of kinesiology,women's health and exercise laboratory,108 noll laboratory,university park,pa 16802,united states,university of ottawa heart institute,current address: division of prevention and rehabilitation,40 ruskin street,ottawa,on k1y 4w7, Canada, the pennsylvania state university,department of kinesiology,women's health and exercise laboratory,108 noll laboratory,university park,pa 16802, United States, the pennsylvania state university,department of kinesiology,women's health and exercise laboratory,108 noll laboratory,university park,pa 16802, United States, the pennsylvania state university,department of kinesiology,women's health and exercise laboratory,108 noll laboratory,university park,pa 16802,united states,university at buffalo,current address: department of pediatrics,school of medicine and biomedical sciences,buffalo,ny, United States, the pennsylvania state university,department of kinesiology,women's health and exercise laboratory,108 noll laboratory,university park,pa 16802, United States
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Authors
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