Age Modulates Physiological Responses during Fan Use under Extreme Heat and Humidity

Daniel Gagnon, Steven A.A. Romero, Matthew N.N. Cramer, Ken Kouda, Paula YS Poh, Hai Ngo, Ollie Jay, Craig G.G. Crandall

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

PURPOSE: We examined the effect of electric fan use on cardiovascular and thermoregulatory responses of nine young (26 ± 3 years) and nine aged (68 ± 4 years) adults exposed to extreme heat and humidity. METHODS: While resting at a temperature of 42°C, relative humidity increased from 30 to 70% in 2% increments every 5 minutes. On randomized days, the protocol was repeated without or with fan use. Heart rate (HR), core (Tcore) and mean skin (Tsk) temperatures were measured continuously. Whole-body sweat loss (WBSL) was measured from changes in nude body weight. Other measures of cardiovascular (cardiac output), thermoregulatory (local cutaneous and forearm vascular conductance, local sweat rate), and perceptual (thermal and thirst sensations) responses were also examined. RESULTS: When averaged over the entire protocol, fan use resulted in a small reduction of HR (-2 beats/min, 95% CI: -8 to 3), and slightly greater Tcore (+0.05°C, 95% CI: -0.13 to 0.23) and Tsk (+0.03°C, 95% CI: -0.36 to 0.42) in young adults. In contrast, fan use resulted in greater HR (+5 beats/min, 95% CI: 0 to 10), Tcore (+0.20°C, 95% CI: 0.00 to 0.41) and Tsk (+0.47°C, 95% CI: 0.18 to 0.76) in aged adults. A greater WBSL during fan use was observed in young (+0.2 kg, 95% CI: -0.2 to 0.6) but not aged (0.0 kg, 95% CI: -0.2 to 0.2) adults. Greater local sweat rate and cutaneous vascular conductance were observed with fan use in aged adults. Other measures of cardiovascular, thermoregulatory and perceptual responses were unaffected by fan use in both groups. CONCLUSION: During extreme heat and humidity, fan use elevates physiological strain in aged, but not young, adults.

Original languageEnglish (US)
JournalMedicine and Science in Sports and Exercise
DOIs
StateAccepted/In press - Jun 12 2017

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Extreme Heat
Sweat
Humidity
Heart Rate
Blood Vessels
Young Adult
Thirst
Skin
Skin Temperature
Forearm
Cardiac Output
Hot Temperature
Body Weight
Temperature

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Age Modulates Physiological Responses during Fan Use under Extreme Heat and Humidity. / Gagnon, Daniel; Romero, Steven A.A.; Cramer, Matthew N.N.; Kouda, Ken; Poh, Paula YS; Ngo, Hai; Jay, Ollie; Crandall, Craig G.G.

In: Medicine and Science in Sports and Exercise, 12.06.2017.

Research output: Contribution to journalArticle

Gagnon, Daniel ; Romero, Steven A.A. ; Cramer, Matthew N.N. ; Kouda, Ken ; Poh, Paula YS ; Ngo, Hai ; Jay, Ollie ; Crandall, Craig G.G. / Age Modulates Physiological Responses during Fan Use under Extreme Heat and Humidity. In: Medicine and Science in Sports and Exercise. 2017.
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abstract = "PURPOSE: We examined the effect of electric fan use on cardiovascular and thermoregulatory responses of nine young (26 ± 3 years) and nine aged (68 ± 4 years) adults exposed to extreme heat and humidity. METHODS: While resting at a temperature of 42°C, relative humidity increased from 30 to 70{\%} in 2{\%} increments every 5 minutes. On randomized days, the protocol was repeated without or with fan use. Heart rate (HR), core (Tcore) and mean skin (Tsk) temperatures were measured continuously. Whole-body sweat loss (WBSL) was measured from changes in nude body weight. Other measures of cardiovascular (cardiac output), thermoregulatory (local cutaneous and forearm vascular conductance, local sweat rate), and perceptual (thermal and thirst sensations) responses were also examined. RESULTS: When averaged over the entire protocol, fan use resulted in a small reduction of HR (-2 beats/min, 95{\%} CI: -8 to 3), and slightly greater Tcore (+0.05°C, 95{\%} CI: -0.13 to 0.23) and Tsk (+0.03°C, 95{\%} CI: -0.36 to 0.42) in young adults. In contrast, fan use resulted in greater HR (+5 beats/min, 95{\%} CI: 0 to 10), Tcore (+0.20°C, 95{\%} CI: 0.00 to 0.41) and Tsk (+0.47°C, 95{\%} CI: 0.18 to 0.76) in aged adults. A greater WBSL during fan use was observed in young (+0.2 kg, 95{\%} CI: -0.2 to 0.6) but not aged (0.0 kg, 95{\%} CI: -0.2 to 0.2) adults. Greater local sweat rate and cutaneous vascular conductance were observed with fan use in aged adults. Other measures of cardiovascular, thermoregulatory and perceptual responses were unaffected by fan use in both groups. CONCLUSION: During extreme heat and humidity, fan use elevates physiological strain in aged, but not young, adults.",
author = "Daniel Gagnon and Romero, {Steven A.A.} and Cramer, {Matthew N.N.} and Ken Kouda and Poh, {Paula YS} and Hai Ngo and Ollie Jay and Crandall, {Craig G.G.}",
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T1 - Age Modulates Physiological Responses during Fan Use under Extreme Heat and Humidity

AU - Gagnon, Daniel

AU - Romero, Steven A.A.

AU - Cramer, Matthew N.N.

AU - Kouda, Ken

AU - Poh, Paula YS

AU - Ngo, Hai

AU - Jay, Ollie

AU - Crandall, Craig G.G.

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N2 - PURPOSE: We examined the effect of electric fan use on cardiovascular and thermoregulatory responses of nine young (26 ± 3 years) and nine aged (68 ± 4 years) adults exposed to extreme heat and humidity. METHODS: While resting at a temperature of 42°C, relative humidity increased from 30 to 70% in 2% increments every 5 minutes. On randomized days, the protocol was repeated without or with fan use. Heart rate (HR), core (Tcore) and mean skin (Tsk) temperatures were measured continuously. Whole-body sweat loss (WBSL) was measured from changes in nude body weight. Other measures of cardiovascular (cardiac output), thermoregulatory (local cutaneous and forearm vascular conductance, local sweat rate), and perceptual (thermal and thirst sensations) responses were also examined. RESULTS: When averaged over the entire protocol, fan use resulted in a small reduction of HR (-2 beats/min, 95% CI: -8 to 3), and slightly greater Tcore (+0.05°C, 95% CI: -0.13 to 0.23) and Tsk (+0.03°C, 95% CI: -0.36 to 0.42) in young adults. In contrast, fan use resulted in greater HR (+5 beats/min, 95% CI: 0 to 10), Tcore (+0.20°C, 95% CI: 0.00 to 0.41) and Tsk (+0.47°C, 95% CI: 0.18 to 0.76) in aged adults. A greater WBSL during fan use was observed in young (+0.2 kg, 95% CI: -0.2 to 0.6) but not aged (0.0 kg, 95% CI: -0.2 to 0.2) adults. Greater local sweat rate and cutaneous vascular conductance were observed with fan use in aged adults. Other measures of cardiovascular, thermoregulatory and perceptual responses were unaffected by fan use in both groups. CONCLUSION: During extreme heat and humidity, fan use elevates physiological strain in aged, but not young, adults.

AB - PURPOSE: We examined the effect of electric fan use on cardiovascular and thermoregulatory responses of nine young (26 ± 3 years) and nine aged (68 ± 4 years) adults exposed to extreme heat and humidity. METHODS: While resting at a temperature of 42°C, relative humidity increased from 30 to 70% in 2% increments every 5 minutes. On randomized days, the protocol was repeated without or with fan use. Heart rate (HR), core (Tcore) and mean skin (Tsk) temperatures were measured continuously. Whole-body sweat loss (WBSL) was measured from changes in nude body weight. Other measures of cardiovascular (cardiac output), thermoregulatory (local cutaneous and forearm vascular conductance, local sweat rate), and perceptual (thermal and thirst sensations) responses were also examined. RESULTS: When averaged over the entire protocol, fan use resulted in a small reduction of HR (-2 beats/min, 95% CI: -8 to 3), and slightly greater Tcore (+0.05°C, 95% CI: -0.13 to 0.23) and Tsk (+0.03°C, 95% CI: -0.36 to 0.42) in young adults. In contrast, fan use resulted in greater HR (+5 beats/min, 95% CI: 0 to 10), Tcore (+0.20°C, 95% CI: 0.00 to 0.41) and Tsk (+0.47°C, 95% CI: 0.18 to 0.76) in aged adults. A greater WBSL during fan use was observed in young (+0.2 kg, 95% CI: -0.2 to 0.6) but not aged (0.0 kg, 95% CI: -0.2 to 0.2) adults. Greater local sweat rate and cutaneous vascular conductance were observed with fan use in aged adults. Other measures of cardiovascular, thermoregulatory and perceptual responses were unaffected by fan use in both groups. CONCLUSION: During extreme heat and humidity, fan use elevates physiological strain in aged, but not young, adults.

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