Effects of obesity and mild hypohydration on local sweating and cutaneous vascular responses during passive heat stress in females
Moyen NE, Burchfield JM, Butts CL, Glenn JM, Tucker MA, Treece K, Smith AJ, McDermott BP, Ganio MS
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 9 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2016-04-09 · Appl Physiol Nutr Metab · vol. 41 · número 8 · págs. 879–887
- Editorial
- NRC Research Press
- Citado
- 17 citas · más que el 87% de estudios similares · 2.3× el promedio de su campo
- Referencias
- 65 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Infrared Thermography in Medicine · Color perception and design
- Palabras clave
- Medicine, Forearm, SWEAT, Internal medicine, Cardiology, Endocrinology, Surgery
- MeSH
- sweat glands, skin, humans, dehydration, obesity, absorptiometry, photon, body mass index, body temperature, exercise, sweating, regional blood flow, adult, female, hot temperature, stress, physiological, young adult, surveys and questionnaires
9 autores
- Nicole E. Moyen🇺🇸University of Arkansas at Fayetteville
- Jenna M. Burchfield🇺🇸University of Arkansas at Fayetteville
- Cory L. Butts🇺🇸University of Arkansas at Fayetteville
- Jordan M. Glenn🇺🇸University of Arkansas at Fayetteville
- Matthew A. Tucker🇺🇸University of Arkansas at Fayetteville
- Keeley Treece🇺🇸University of Arkansas at Fayetteville
- Amber J. Smith🇺🇸University of Arkansas at Fayetteville
- Brendon P. McDermott🇺🇸University of Arkansas at Fayetteville
- Matthew S. Ganio🇺🇸University of Arkansas at Fayetteville
Resumen
El texto original del estudio, en el idioma en que se publicó.
The purpose of this study was to evaluate the effect of obesity and mild hypohydration on local sweating (LSR) and cutaneous vascular conductance (CVC) responses during passive heat stress in females. Thirteen obese (age, 24 ± 4 years; 45.4% ± 5.2% body fat) and 12 nonobese (age, 22 ± 2 years; 25.1% ± 3.9% body fat) females were passively heated (1.0 °C rectal temperature increase) while either euhydrated (EUHY) or mildly hypohydrated (HYPO; via fluid restriction). Chest and forearm LSR (ventilated capsule) and CVC (Laser Doppler flowmetry) onset, sensitivity, and plateau/steady state were recorded as mean body temperature increased (ΔTb). Participants began trials EUHY (urine specific gravity, Usg = 1.009 ± 0.006) or HYPO (Usg = 1.025 ± 0.004; p < 0.05), and remained EUHY or HYPO. Independent of obesity, HYPO decreased sweat sensitivity at the chest (HYPO = 0.79 ± 0.35, EUHY = 0.95 ± 0.39 Δmg·min(-1)·cm(-2)/°C ΔTb) and forearm (HYPO = 0.82 ± 0.39, EUHY = 1.06 ± 0.34 Δmg·min(-1)·cm(-2)/°C ΔTb); forearm LSR plateau was also decreased (HYPO = 0.66 ± 0.19, EUHY = 0.78 ± 0.23 mg·min(-1)·cm(-2); all p < 0.05). Overall, obese females had lower chest-sweat sensitivity (0.72 ± 0.35 vs. 1.01 ± 0.33 Δmg·min(-1)·cm(-2)/°C ΔTb) and plateau (0.55 ± 0.27 vs. 0.80 ± 0.25 mg·min(-1)·cm(-2); p < 0.05). While hypohydrated, obese females had a lower chest LSR (p < 0.05) versus nonobese females midway (0.45 ± 0.26 vs. 0.73 ± 0.23 mg·min(-1)·cm(-2)) and at the end (0.53 ± 0.27 vs. 0.81 ± 0.24 mg·min(-1)·cm(-2)) of heating. Furthermore, HYPO (relative to the EUHY trials) led to a greater decrease in CVC sensitivity in obese (-28 ± 27 Δ% maximal CVC/°C ΔTb) versus nonobese females (+9.2 ± 33 Δ% maximal CVC/°C ΔTb; p < 0.05). In conclusion, mild hypohydration impairs females' sweating responses during passive heat stress, and this effect is exacerbated when obese.
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