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Conrad NJ, Heckler EP, Lee BJ, Hill GW, Flood TR, Wheeler LEV, Costello R, Walker EF, Gillum TL, Willems MET, Kuennen MR. New Zealand blackcurrant extract modulates the heat shock response in men during exercise in hot ambient conditions. Eur J Appl Physiol 2024; 124:2315-2328. [PMID: 38448730 PMCID: PMC11322260 DOI: 10.1007/s00421-024-05439-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 02/16/2024] [Indexed: 03/08/2024]
Abstract
PURPOSE To determine if 7d of New Zealand blackcurrant (NZBC) extract alters the heat shock, inflammatory and apoptotic response during prolonged exertional-heat stress. METHODS Ten men (Age: 29 ± 2 years, Stature: 1.82 ± 0.02 m, Mass: 80.3 ± 2.7 kg, V̇O2max: 56 ± 2 mL·kg-1·min-1) ingested two capsules of CurraNZ™ (NZBC extract: 210 mg anthocyanins·day-1) or PLACEBO for 7d prior to 1 h treadmill run (65% V̇O2max) in hot ambient conditions (34 °C/40% RH). Blood samples were collected before (Pre), immediately after (Post), 1 h after (1-Post), and 4 h after (4-Post) exercise. Heat shock proteins (HSP90, HSP70, HSP32) were measured in plasma. HSP and protein markers of inflammatory capacity (TLR4, NF-κB) and apoptosis (BAX/BCL-2, Caspase 9) were measured in peripheral blood mononuclear cells (PBMC). RESULTS eHSP32 was elevated at baseline in NZBC(+ 31%; p < 0.001). In PLACEBO HSP32 content in PBMC was elevated at 4-Post(+ 98%; p = 0.002), whereas in NZBC it fell at Post(- 45%; p = 0.030) and 1-Post(- 48%; p = 0.026). eHSP70 was increased at Post in PLACEBO(+ 55.6%, p = 0.001) and NZBC (+ 50.7%, p = 0.010). eHSP90 was increased at Post(+ 77.9%, p < 0.001) and 1-Post(+ 73.2%, p < 0.001) in PLACEBO, with similar increases being shown in NZBC (+ 49.0%, p = 0.006 and + 66.2%, p = 0.001; respectively). TLR4 and NF-κB were both elevated in NZBC at PRE(+ 54%, p = 0.003 and + 57%, p = 0.004; respectively). Main effects of study condition were also shown for BAX/BCL-2(p = 0.025) and Caspase 9 (p = 0.043); both were higher in NZBC. CONCLUSION 7d of NZBC extract supplementation increased eHSP32 and PBMC HSP32 content. It also increased inflammatory and apoptotic markers in PBMC, suggesting that NZBC supports the putative inflammatory response that accompanies exertional-heat stress.
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Affiliation(s)
- Nathan J Conrad
- Department of Health & Human Performance, High Point University, One University Parkway, High Point, NC, 27268, USA
| | - Emerson P Heckler
- Department of Health & Human Performance, High Point University, One University Parkway, High Point, NC, 27268, USA
| | - Ben J Lee
- Occupational and Environmental Physiology Group, Centre for Physical Activity, Sport and Exercise Science, Coventry University, Coventry, England
- Institute of Applied Sciences, University of Chichester, Chichester, UK
| | - Garrett W Hill
- Department of Health & Human Performance, High Point University, One University Parkway, High Point, NC, 27268, USA
| | - Tessa R Flood
- Institute of Sport, Manchester Metropolitan University, Manchester, UK
- Institute of Applied Sciences, University of Chichester, Chichester, UK
| | - Lucy E V Wheeler
- Institute of Applied Sciences, University of Chichester, Chichester, UK
| | - Rianne Costello
- Global Food Security Programme, Biotechnology and Biological Sciences Research Council, Swindon, UK
| | - Ella F Walker
- Defence Science and Technology Laboratory, Porton Down, Salisbury, UK
| | - Trevor L Gillum
- Department of Kinesiology, California Baptist University, Riverside, CA, USA
| | - Mark E T Willems
- Institute of Applied Sciences, University of Chichester, Chichester, UK
| | - Matthew R Kuennen
- Department of Health & Human Performance, High Point University, One University Parkway, High Point, NC, 27268, USA.
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Mao Y, Hong K, Li L, Nam IK, Kim SH, Choe SK. Mitochondrial Fission Is Involved in Heat Resistance in Zebrafish. Zebrafish 2024. [PMID: 39007173 DOI: 10.1089/zeb.2024.0128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/16/2024] Open
Abstract
Global warming and extreme weather events pose a significant threat to global biodiversity, with rising water temperatures exerting a profound influence on fish conservation and fishery development. In this study, we used zebrafish as a model organism to explore the impact of a heat acclimation period on their survival rates. The results demonstrated that a 2-month heat acclimation period almost completely mitigated heat stress-induced mortality in zebrafish. Subsequent analysis of the surviving zebrafish revealed a predominance of hepatic mitochondria in a fission state. Remarkably, a short-term fasting regimen, which induced hepatic mitochondrial fission, mirrored the outcomes of the protective effect of heat acclimation and augmented animal survival under heat stress. Conversely, treatment with a mitochondrial fission inhibitor within the fasting group attenuated the elevated survival rate. Furthermore, zebrafish embryos subjected to brief heat acclimation also exhibited increased heat resistance, a trait diminished by a chemical intervention inhibiting mitochondrial fission. This suggests a shared mechanism for heat resistance between embryos and adult zebrafish. These findings underscore the potential use of inducing mitochondrial fission to enhance heat resistance in zebrafish, offering promise for fish biodiversity conservation in the face of global warming.
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Affiliation(s)
- Yousheng Mao
- Department of Medicine, Graduate School, Wonkwang University, Iksan, Republic of Korea
| | - KwangHeum Hong
- Department of Medicine, Graduate School, Wonkwang University, Iksan, Republic of Korea
- Sarcopenia Total Solution Center, Wonkwang University, Iksan, Republic of Korea
| | - Li Li
- Department of Medicine, Graduate School, Wonkwang University, Iksan, Republic of Korea
| | - In-Koo Nam
- Sarcopenia Total Solution Center, Wonkwang University, Iksan, Republic of Korea
| | - Seok-Hyung Kim
- Sarcopenia Total Solution Center, Wonkwang University, Iksan, Republic of Korea
| | - Seong-Kyu Choe
- Department of Medicine, Graduate School, Wonkwang University, Iksan, Republic of Korea
- Sarcopenia Total Solution Center, Wonkwang University, Iksan, Republic of Korea
- Department of Microbiology, Wonkwang University School of Medicine, Iksan, Republic of Korea
- Institute of Wonkwang Medical Science, Wonkwang University, Iksan, Republic of Korea
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Li L, Chen J, Wang Y, Pei Y, Ren L, Dai X, Li J, Ma J, Wang M, Chang W, Chen J, Song Q, Xu S. Heat acclimation with probiotics-based ORS supplementation alleviates heat stroke-induced multiple organ dysfunction via improving intestinal thermotolerance and modulating gut microbiota in rats. Front Microbiol 2024; 15:1385333. [PMID: 38962135 PMCID: PMC11220321 DOI: 10.3389/fmicb.2024.1385333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 06/05/2024] [Indexed: 07/05/2024] Open
Abstract
Heat stroke (HS) is a critical condition with extremely high mortality. Heat acclimation (HA) is widely recognized as the best measure to prevent and protect against HS. Preventive administration of oral rehydration salts III (ORSIII) and probiotics have been reported to sustain intestinal function in cases of HS. This study established a rat model of HA that was treated with probiotics-based ORS (ORSP) during consecutive 21-day HA training. The results showed that HA with ORSP could attenuate HS-induced hyperthermia by regulating thermoregulatory response. We also found that HA with ORSP could significantly alleviate HS-induced multiple organ injuries. The expression levels of a series of heat-shock proteins (HSPs), including HSP90, HSP70, HSP60, and HSP40, were significantly up-regulated from the HA training. The increases in intestinal fatty acid binding protein (I-FABP) and D-Lactate typically seen during HS were decreased through HA. The representative TJ proteins including ZO-1, E-cadherin, and JAM-1 were found to be significantly down-regulated by HS, but sustained following HA. The ultrastructure of TJ was examined by TEM, which confirmed its protective effect on the intestinal barrier protection following HA. We also demonstrated that HA raised the intestinal levels of beneficial bacteria Lactobacillus and lowered those of the harmful bacteria Streptococcus through 16S rRNA gene sequencing. These findings suggest that HA with ORSP was proven to improve intestinal thermotolerance and the levels of protective gut microbiota against HS.
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Affiliation(s)
- Lei Li
- Department of Emergency, Changhai Hospital, Naval Medical University, Shanghai, China
- Department of Emergency, The Second Naval Hospital of Southern Theater Command of PLA, Sanya, China
- Heatstroke Treatment and Research Center of PLA, Sanya, China
| | - Juelin Chen
- Department of Emergency, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Yawei Wang
- Department of Emergency, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Yankun Pei
- Department of Emergency, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Lijun Ren
- Department of Health Toxicology, Faculty of Naval Medicine, Naval Medical University, Shanghai, China
| | - Xiaoyu Dai
- Department of Health Toxicology, Faculty of Naval Medicine, Naval Medical University, Shanghai, China
| | - Jinfeng Li
- Department of Health Toxicology, Faculty of Naval Medicine, Naval Medical University, Shanghai, China
| | - Jun Ma
- Heatstroke Treatment and Research Center of PLA, Sanya, China
- Postgraduate School, Medical School of Chinese PLA General Hospital, Beijing, China
| | - Man Wang
- School of Traditional Chinese Medicine, Naval Medical University, Shanghai, China
- Department of Rehabilitation, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Wenjun Chang
- Faculty of Naval Medicine, Naval Medical University, Shanghai, China
| | - Jikuai Chen
- Department of Health Toxicology, Faculty of Naval Medicine, Naval Medical University, Shanghai, China
| | - Qing Song
- Heatstroke Treatment and Research Center of PLA, Sanya, China
| | - Shuogui Xu
- Department of Emergency, Changhai Hospital, Naval Medical University, Shanghai, China
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Muhamad SN, Lim FL, Md Akim A, Karuppiah K, Mohd Shabri NSA, How V. Association between physiological responses and heat shock protein 70 (HSP70) expressions in the vulnerable populations of Kuala Lumpur. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2024:1-11. [PMID: 38616509 DOI: 10.1080/09603123.2024.2340125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 04/02/2024] [Indexed: 04/16/2024]
Abstract
Continued heat exposure can cause physiological and cellular responses. This study investigated the association between physiological responses and heat shock protein 70 (HSP70) expressions in Kuala Lumpur's urban vulnerable population. We conducted a cross-sectional study involving 54 participants from four areas classified as experiencing moderate to strong heat stress. Physiological measurements included core body temperature, heart rate, and diastolic and systolic blood pressure. RT-qPCR and ELISA were also performed on blood samples to assess HSP70 gene and protein expressions. Despite indoor heat stress, participants maintained normal physiological parameters while there were significant indications of HSP70 expression at both the gene and protein levels. However, our study found no significant correlation (p > 0.05) between physiological responses and HSP70 expressions. This study shows no interaction between physiological responses and HSP70 expressions in the study population, revealing the complex mechanisms of indoor heat stress in vulnerable individuals.
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Affiliation(s)
- Siti Nurfahirah Muhamad
- Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Fang Lee Lim
- Department of Environmental Engineering, Universiti Tunku Abdul Rahman, Faculty of Engineering and Green Technology, Kampar, Perak, Malaysia
| | - Abdah Md Akim
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Karmegam Karuppiah
- Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Nur Shabrina Azreen Mohd Shabri
- Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Vivien How
- Department of Environmental and Occupational Health, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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Butler-Dawson J, Johnson RJ, Krisher L, Jaramillo D, Cruz A, Pilloni D, Brindley S, Rodriguez-Iturbe B, Sanchez-Lozada LG, Dally M, Newman LS. A longitudinal assessment of heat exposure and biomarkers of kidney function on heat shock protein 70 and antibodies among agricultural workers. RESEARCH SQUARE 2024:rs.3.rs-3887323. [PMID: 38343868 PMCID: PMC10854298 DOI: 10.21203/rs.3.rs-3887323/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/19/2024]
Abstract
Background Exposure to extreme heat impacts millions of people worldwide and outdoor workers are among the populations most affected by high temperatures. Heat stress induces several biological responses in humans, including the production of heat shock proteins (HSP) and antibodies against HSP (anti-HSP) which may play a central role in the body's cellular response to a hot environment. Objective This longitudinal study investigated the impact of high temperatures and humidity on the presence of HSP70 and anti-HSP70 and examined relationships with markers of kidney function in an at-risk workforce under conditions of extreme heat and exertion in Guatemala. Methods We collected ambient temperature and relative humidity data as well as biomarkers and clinical data from 40 sugarcane workers at the start and the end of a 6-month harvest. We used generalized mixed-effects models to estimate temperature effects on HSP70 and anti-HSP70 levels. In addition, we examined trends between HSP70 and anti-HSP70 levels and markers of kidney function across the harvest. Results At the end of the harvest, temperatures were higher, and workers had, on average, higher levels of HSP70 and anti-HSP70 compared to the beginning of the season. We observed significant increasing trends with temperature indices and HSP70 levels. Maximum temperature was associated with HSP70 increments after controlling for age, systolic and diastolic blood pressure (β: 0.21, 95% Confidence Interval: 0.09, 0.33). Kidney function decline across the harvest was associated with both higher levels of anti-HSP70 levels at the end of the harvest as well as greater increases in anti-HSP70 levels across the harvest. Conclusions These results suggest that workplace heat exposure may increase the production of HSP70 and anti-HSP70 levels and that there may be a relationship between increasing anti-HSP70 antibodies and the development of renal injury. HSP70 holds promise as a biomarker of heat stress in exposed populations.
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Fennel ZJ, Ducharme JB, Berkemeier QN, Specht JW, McKenna ZJ, Simpson SE, Nava RC, Escobar KA, Hafen PS, Deyhle MR, Amorim FT, Mermier CM. Effect of heat stress on heat shock protein expression and hypertrophy-related signaling in the skeletal muscle of trained individuals. Am J Physiol Regul Integr Comp Physiol 2023; 325:R735-R749. [PMID: 37842742 DOI: 10.1152/ajpregu.00031.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 10/17/2023]
Abstract
Muscle mass is balanced between hypertrophy and atrophy by cellular processes, including activation of the protein kinase B-mechanistic target of rapamycin (Akt-mTOR) signaling cascade. Stressors apart from exercise and nutrition, such as heat stress, can stimulate the heat shock protein A (HSPA) and C (HSPC) families alongside hypertrophic signaling factors and muscle growth. The effects of heat stress on HSP expression and Akt-mTOR activation in human skeletal muscle and their magnitude of activation compared with known hypertrophic stimuli are unclear. Here, we show a single session of whole body heat stress following resistance exercise increases the expression of HSPA and activation of the Akt-mTOR cascade in skeletal muscle compared with resistance exercise in a healthy, resistance-trained population. Heat stress alone may also exert similar effects, though the responses are notably variable and require further investigation. In addition, acute heat stress in C2C12 muscle cells enhanced myotube growth and myogenic fusion, albeit to a lesser degree than growth factor-mediated hypertrophy. Though the mechanisms by which heat stress stimulates hypertrophy-related signaling and the potential mechanistic role of HSPs remain unclear, these findings provide additional evidence implicating heat stress as a novel growth stimulus when combined with resistance exercise in human skeletal muscle and alone in isolated murine muscle cells. We believe these findings will help drive further applied and mechanistic investigation into how heat stress influences muscular hypertrophy and atrophy.NEW & NOTEWORTHY We show that acute resistance exercise followed by whole body heat stress increases the expression of HSPA and increases activation of the Akt-mTOR cascade in a physically active and resistance-trained population.
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Affiliation(s)
- Zachary J Fennel
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
- Molecular Medicine Program, University of Utah, Salt Lake City, Utah, United States
| | - Jeremy B Ducharme
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
| | - Quint N Berkemeier
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
| | - Jonathan W Specht
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
| | - Zachary J McKenna
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
- Institute for Exercise and Environmental Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States
| | - Shandy E Simpson
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
| | - Roberto C Nava
- Fulcrum Therapeutics, Cambridge, Massachusetts, United States
| | - Kurt A Escobar
- Department of Kinesiology, California State University Long Beach, Long Beach, California, United States
| | - Paul S Hafen
- Division of Science, Indiana University Purdue University Columbus, Columbus, Indiana, United States
- Department of Anatomy, Cell Biology, and Physiology, Indiana Center for Musculoskeletal Health, Indiana University School of Medicine Indianapolis, Indianapolis, Indiana, United States
| | - Michael R Deyhle
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
- Department of Cell Biology and Physiology, School of Medicine, University of New Mexico, Albuquerque, New Mexico, United States
| | - Fabiano T Amorim
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
| | - Christine M Mermier
- Department of Health, Exercise & Sports Sciences, University of New Mexico, Albuquerque, New Mexico, United States
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Çelebi Sözener Z, Treffeisen ER, Özdel Öztürk B, Schneider LC. Global warming and implications for epithelial barrier disruption and respiratory and dermatologic allergic diseases. J Allergy Clin Immunol 2023; 152:1033-1046. [PMID: 37689250 PMCID: PMC10864040 DOI: 10.1016/j.jaci.2023.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 09/01/2023] [Accepted: 09/04/2023] [Indexed: 09/11/2023]
Abstract
Global warming has direct and indirect effects, as well as short- and long-term impacts on the respiratory and skin barriers. Extreme temperature directly affects the airway epithelial barrier by disrupting the structural proteins and by triggering airway inflammation and hyperreactivity. It enhances tidal volume and respiratory rate by affecting the thermoregulatory system, causing specific airway resistance and reflex bronchoconstriction via activation of bronchopulmonary vagal C fibers and upregulation of transient receptor potential vanilloid (TRPV) 1 and TRPV4. Heat shock proteins are activated under heat stress and contribute to both epithelial barrier dysfunction and airway inflammation. Accordingly, the frequency and severity of allergic rhinitis and asthma have been increasing. Heat activates TRPV3 in keratinocytes, causing the secretion of inflammatory mediators and eventually pruritus. Exposure to air pollutants alters the expression of genes that control skin barrier integrity and triggers an immune response, increasing the incidence and prevalence of atopic dermatitis. There is evidence that extreme temperature, heavy rains and floods, air pollution, and wildfires increase atopic dermatitis flares. In this narrative review, focused on the last 3 years of literature, we explore the effects of global warming on respiratory and skin barrier and their clinical consequences.
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Affiliation(s)
- Zeynep Çelebi Sözener
- Division of Immunology and Allergic Diseases, Ankara Bilkent City Hospital, Ankara, Turkey.
| | - Elsa R Treffeisen
- Division of Immunology, Boston Children's Hospital, Boston, Mass; Department of Pediatrics, Harvard Medical School, Boston, Mass
| | - Betül Özdel Öztürk
- Division of Immunology and Allergic Diseases, Bolu Izzet Baysal Training and Research Hospital, Bolu, Turkey
| | - Lynda C Schneider
- Division of Immunology, Boston Children's Hospital, Boston, Mass; Department of Pediatrics, Harvard Medical School, Boston, Mass
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Corbett J, Young JS, Tipton MJ, Costello JT, Williams TB, Walker EF, Lee BJ, Stevens CE. Molecular biomarkers for assessing the heat-adapted phenotype: a narrative scoping review. J Physiol Sci 2023; 73:26. [PMID: 37848829 DOI: 10.1186/s12576-023-00882-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 10/03/2023] [Indexed: 10/19/2023]
Abstract
Heat acclimation/acclimatisation (HA) mitigates heat-related decrements in physical capacity and heat-illness risk and is a widely advocated countermeasure for individuals operating in hot environments. The efficacy of HA is typically quantified by assessing the thermo-physiological responses to a standard heat acclimation state test (i.e. physiological biomarkers), but this can be logistically challenging, time consuming, and expensive. A valid molecular biomarker of HA would enable evaluation of the heat-adapted state through the sampling and assessment of a biological medium. This narrative review examines candidate molecular biomarkers of HA, highlighting the poor sensitivity and specificity of these candidates and identifying the current lack of a single 'standout' biomarker. It concludes by considering the potential of multivariable approaches that provide information about a range of physiological systems, identifying a number of challenges that must be overcome to develop a valid molecular biomarker of the heat-adapted state, and highlighting future research opportunities.
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Affiliation(s)
- J Corbett
- Extreme Environments Laboratory, School of Sport Health and Exercise Sciences, University of Portsmouth, Portsmouth, UK.
| | - J S Young
- National Horizons Centre, Teesside University, Darlington, UK
| | - M J Tipton
- Extreme Environments Laboratory, School of Sport Health and Exercise Sciences, University of Portsmouth, Portsmouth, UK
| | - J T Costello
- Extreme Environments Laboratory, School of Sport Health and Exercise Sciences, University of Portsmouth, Portsmouth, UK
| | - T B Williams
- Extreme Environments Laboratory, School of Sport Health and Exercise Sciences, University of Portsmouth, Portsmouth, UK
| | - E F Walker
- Defence Science and Technology Laboratory, Porton Down, Salisbury, UK
| | - B J Lee
- Occupational and Environmental Physiology Group, Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Coventry University, Coventry, UK
| | - C E Stevens
- Extreme Environments Laboratory, School of Sport Health and Exercise Sciences, University of Portsmouth, Portsmouth, UK
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Rastmanesh R, Flack KD. Dietary Temperature's Influence on Energy Balance in Humans: Protocol for a Randomized Controlled Trial and Crossover Design. JMIR Res Protoc 2023; 12:e42846. [PMID: 36867437 PMCID: PMC10024216 DOI: 10.2196/42846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 12/31/2022] [Accepted: 01/03/2023] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND According to the first law of thermodynamics, energy cannot be created or destroyed in an isolated system. Water has a characteristically high heat capacity, indicating that the temperature of ingested fluids and meals could contribute to energy homeostasis. Citing the underlying molecular mechanisms, we present a novel hypothesis that states that the temperature of one's food and drink contributes to energy balance and plays a role in the development of obesity. We provide strong associations with certain molecular mechanisms that are activated by heat and correlate them with obesity and a hypothetical trial that could test this hypothesis. We conclude that if meal or drink temperature proves to contribute to energy homeostasis, then depending on its contribution and scale, future clinical trials should attempt to adjust this effect when analyzing data. In addition, previous research and established relationships of disease states with dietary patterns, energy intake, and food component intakes should be revisited. We understand the common assumption that thermal energy in food is absorbed by the body during digestion and dissipated as heat into the environment, not contributing to the energy balance. We challenge this assumption herein, including a proposed study design that would test our hypothesis. OBJECTIVE This paper hypothesizes that the temperature of ingested foods or fluids influences energy homeostasis through the expression of heat shock proteins (HSPs), especially HSP-70 and HSP-90, which are expressed to a greater extent in obesity and are known to cause deficits in glucose metabolism. METHODS We provide preliminary evidence supporting our hypothesis that greater dietary temperatures disproportionally induce activation of both intracellular and extracellular HSPs and that these HSPs influence energy balance and contribute to obesity. RESULTS This trial protocol has not been initiated and funding has not been sought at the time of this publication. CONCLUSIONS To date, no clinical trials are available regarding the potential effects of meal and fluid temperature on weight status or its confounding effects in data analysis. A potential mechanism is proposed as a basis by which higher temperatures of foods and beverages might influence energy balance via HSP expression. On the basis of the evidence supporting our hypothesis, we propose a clinical trial that will further elucidate these mechanisms. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) PRR1-10.2196/42846.
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Affiliation(s)
| | - Kyle D Flack
- Department of Dietetics and Human Nutrition, University of Kentucky, Lexington, KY, United States
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Sebők J, Édel Z, Dembrovszky F, Farkas N, Török Z, Balogh G, Péter M, Papp I, Balogi Z, Nusser N, Péter I, Hooper P, Geiger P, Erőss B, Wittmann I, Váncsa S, Vigh L, Hegyi P. Effect of HEAT therapy in patiEnts with type 2 Diabetes mellitus (HEATED): protocol for a randomised controlled trial. BMJ Open 2022; 12:e062122. [PMID: 35820741 PMCID: PMC9277369 DOI: 10.1136/bmjopen-2022-062122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
INTRODUCTION The burden of type 2 diabetes mellitus (T2DM) is increasing worldwide. Heat therapy has been found effective in improving glycaemic control. However, to date, there is a lack of randomised controlled studies investigating the efficacy of heat therapy in T2DM. Therefore, we aim to investigate whether heat therapy with natural thermal mineral water can improve glycaemic control in patients with T2DM. METHODS AND ANALYSIS The HEAT therapy in patiEnts with type 2 Diabetes mellitus (HEATED) Study is a single-centre, two-arm randomised controlled trial being conducted at Harkány Thermal Rehabilitation Centre in Hungary. Patients with T2DM will be randomly assigned to group A (bath sessions in 38°C natural thermal mineral water) and group B (baths in thermoneutral water (30°C-32°C)). Both groups will complete a maximum of 5 weekly visits, averaging 50-60 visits over the 12-week study. Each session will last 30 min, with a physical check-up before the bath. At baseline, patients' T2DM status will be investigated thoroughly. Possible microvascular and macrovascular complications of T2DM will be assessed with physical and laboratory examinations. The short form-36 questionnaire will assess the quality of life. Patients will also be evaluated at weeks 4, 8 and 12. The primary endpoint will be the change of glycated haemoglobin from baseline to week 12. An estimated 65 patients will be enrolled per group, with a sample size re-estimation at the enrolment of 50% of the calculated sample size. ETHICS AND DISSEMINATION The study has been approved by the Scientific and Research Ethics Committee of the Hungarian Medical Research Council (818-2/2022/EÜIG). Written informed consent is required from all participants. We will disseminate our results to the medical community and will publish our results in peer-reviewed journals. TRIAL REGISTRATION NUMBER ClinicalTrials.gov, NCT05237219.
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Affiliation(s)
- Judit Sebők
- 2nd Department of Internal Medicine, University of Pecs Medical School, Pécs, Hungary
| | - Zsófia Édel
- 2nd Department of Internal Medicine, University of Pecs Medical School, Pécs, Hungary
| | - Fanni Dembrovszky
- Institute for Translational Medicine, Szentágothai Research Centre, University of Pecs Medical School, Pécs, Hungary
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | - Nelli Farkas
- Institute for Translational Medicine, Szentágothai Research Centre, University of Pecs Medical School, Pécs, Hungary
- Institute of Bioanalysis, University of Pecs Medical School, Pécs, Hungary
| | | | | | | | | | - Zsolt Balogi
- Institute of Biochemistry and Medical Chemistry, University of Pecs Medical School, Pécs, Hungary
| | - Nóra Nusser
- Harkány Thermal Rehabilitation Centre, Harkány, Hungary
| | - Iván Péter
- Harkány Thermal Rehabilitation Centre, Harkány, Hungary
| | - Philip Hooper
- Division of Endocrinology, Metabolism and Diabetes, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Paige Geiger
- Department of Molecular and Integrative Physiology, University of Kansas School of Medicine, Kansas City, Kansas, USA
| | - Bálint Erőss
- Institute for Translational Medicine, Szentágothai Research Centre, University of Pecs Medical School, Pécs, Hungary
- Division of Pancreatic Diseases, Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - István Wittmann
- 2nd Department of Internal Medicine, University of Pecs Medical School, Pécs, Hungary
| | - Szilárd Váncsa
- Institute for Translational Medicine, Szentágothai Research Centre, University of Pecs Medical School, Pécs, Hungary
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | | | - Péter Hegyi
- Institute for Translational Medicine, Szentágothai Research Centre, University of Pecs Medical School, Pécs, Hungary
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
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11
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Giersch G, Garcia C, Stachenfeld N, Charkoudian N. Are there sex differences in risk for exertional heat stroke? A translational approach. Exp Physiol 2022; 107:1136-1143. [PMID: 35598159 DOI: 10.1113/ep090402] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/11/2022] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the topic of this review? This review discusses the current status of the literature in sex differences in exertional heat stroke. What advances does this review highlight? We utilize a translational model to explore possible physical and physiological differences with respect risk and treatment of exertional heat stroke. ABSTRACT Exertional heat stroke (EHS) is a potentially fatal condition brought about by a combination of physical activity and heat stress and resulting in central nervous system dysfunction and organ damage. EHS impacts several hundred individuals each year ranging from military personnel, athletes, to occupational workers. Understanding the pathophysiology and risk factors can aid in reducing EHS across the globe. While we know there are differences between sexes in mechanisms of thermoregulation, there is currently not a clear understanding if/how those differences impact EHS risk. The purpose of this review is to assess the current status of the literature surrounding EHS from risk factors to treatment using both animal and human models. We use a translational approach, considering both animal and human research to elucidate the possible influence of female sex hormones on temperature regulation and performance in the heat and highlight the specific areas with limited research. While more work is necessary to comprehensively understand these differences, the current research presented provides a good framework for future investigations. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Gabrielle Giersch
- Thermal and Mountain Medicine Division, U.S. Army Research Institute for Environmental Medicine, Natick, MA, USA.,Oak Ridge Institute for Science and Education, Belcamp, MD, USA
| | - Christian Garcia
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL, USA
| | - Nina Stachenfeld
- John B. Pierce Laboratory, Yale School of Medicine, New Haven, CT, USA
| | - Nisha Charkoudian
- Thermal and Mountain Medicine Division, U.S. Army Research Institute for Environmental Medicine, Natick, MA, USA
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12
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Alagar Boopathy LR, Jacob-Tomas S, Alecki C, Vera M. Mechanisms tailoring the expression of heat shock proteins to proteostasis challenges. J Biol Chem 2022; 298:101796. [PMID: 35248532 PMCID: PMC9065632 DOI: 10.1016/j.jbc.2022.101796] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 02/23/2022] [Accepted: 02/25/2022] [Indexed: 12/14/2022] Open
Abstract
All cells possess an internal stress response to cope with environmental and pathophysiological challenges. Upon stress, cells reprogram their molecular functions to activate a survival mechanism known as the heat shock response, which mediates the rapid induction of molecular chaperones such as the heat shock proteins (HSPs). This potent production overcomes the general suppression of gene expression and results in high levels of HSPs to subsequently refold or degrade misfolded proteins. Once the damage or stress is repaired or removed, cells terminate the production of HSPs and resume regular functions. Thus, fulfillment of the stress response requires swift and robust coordination between stress response activation and completion that is determined by the status of the cell. In recent years, single-cell fluorescence microscopy techniques have begun to be used in unravelling HSP-gene expression pathways, from DNA transcription to mRNA degradation. In this review, we will address the molecular mechanisms in different organisms and cell types that coordinate the expression of HSPs with signaling networks that act to reprogram gene transcription, mRNA translation, and decay and ensure protein quality control.
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13
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Sebők J, Édel Z, Váncsa S, Farkas N, Kiss S, Erőss B, Török Z, Balogh G, Balogi Z, Nagy R, Hooper PL, Geiger PC, Wittmann I, Vigh L, Dembrovszky F, Hegyi P. Heat therapy shows benefit in patients with type 2 diabetes mellitus: a systematic review and meta-analysis. Int J Hyperthermia 2021; 38:1650-1659. [PMID: 34808071 DOI: 10.1080/02656736.2021.2003445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
AIMS Type-2 diabetes mellitus (T2DM) is a common health condition which prevalence increases with age. Besides lifestyle modifications, passive heating could be a promising intervention to improve glycemic control. This study aimed to assess the efficacy of passive heat therapy on glycemic and cardiovascular parameters, and body weight among patients with T2DM. METHODS A systematic review and meta-analysis were reported according to PRISMA Statement. We conducted a systematic search in three databases (MEDLINE, Embase, CENTRAL) from inception to 19 August 2021. We included interventional studies reporting on T2DM patients treated with heat therapy. The main outcomes were the changes in pre-and post-treatment cardiometabolic parameters (fasting plasma glucose, glycated plasma hemoglobin, and triglyceride). For these continuous variables, weighted mean differences (WMD) with 95% confidence intervals (CIs) were calculated. Study protocol number: CRD42020221500. RESULTS Five studies were included in the qualitative and quantitative synthesis, respectively. The results showed a not significant difference in the hemoglobin A1c [WMD -0.549%, 95% CI (-1.262, 0.164), p = 0.131], fasting glucose [WMD -0.290 mmol/l, 95% CI (-0.903, 0.324), p = 0.355]. Triglyceride [WMD 0.035 mmol/l, 95% CI (-0.130, 0.200), p = 0.677] levels were comparable regarding the pre-, and post intervention values. CONCLUSION Passive heating can be beneficial for patients with T2DM since the slight improvement in certain cardiometabolic parameters support that. However, further randomized controlled trials with longer intervention and follow-up periods are needed to confirm the beneficial effect of passive heat therapy.
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Affiliation(s)
- Judit Sebők
- 2nd Department of Medicine and Nephrology-Diabetes Center, Medical School, University of Pécs, Pécs, Hungary
| | - Zsófia Édel
- 2nd Department of Medicine and Nephrology-Diabetes Center, Medical School, University of Pécs, Pécs, Hungary
| | - Szilárd Váncsa
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | - Nelli Farkas
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Institute of Bioanalysis, Medical School, University of Pécs, Pécs, Hungary
| | - Szabolcs Kiss
- Doctoral School of Clinical Medicine, University of Szeged, Szeged, Hungary
| | - Bálint Erőss
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | - Zsolt Török
- LipidArt Ltd., Szeged, Hungary.,Institute of Biochemistry, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Gábor Balogh
- LipidArt Ltd., Szeged, Hungary.,Institute of Biochemistry, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Zsolt Balogi
- Heim Pál National Pediatric Institute, Budapest, Hungary
| | - Rita Nagy
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Centre for Translational Medicine, Semmelweis University, Budapest, Hungary.,Division of Endocrinology, Metabolism and Diabetes, Department of Medicine, University of Colorado Denver, Aurora, CO, USA
| | - Philip L Hooper
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS, USA
| | - Paige C Geiger
- Department of Biochemistry and Medical Chemistry, Medical School, University of Pécs, Pécs, Hungary
| | - István Wittmann
- 2nd Department of Medicine and Nephrology-Diabetes Center, Medical School, University of Pécs, Pécs, Hungary
| | - László Vigh
- LipidArt Ltd., Szeged, Hungary.,Institute of Biochemistry, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary
| | - Fanni Dembrovszky
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | - Péter Hegyi
- Institute for Translational Medicine, Szentágothai Research Centre, Medical School, University of Pécs, Pécs, Hungary.,Centre for Translational Medicine, Semmelweis University, Budapest, Hungary.,Division of Pancreatic Diseases, Heart and Vascular Center, Semmelweis University, Budapest, Hungary
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14
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Rai R, Kennedy AL, Isingizwe ZR, Javadian P, Benbrook DM. Similarities and Differences of Hsp70, hsc70, Grp78 and Mortalin as Cancer Biomarkers and Drug Targets. Cells 2021; 10:cells10112996. [PMID: 34831218 PMCID: PMC8616428 DOI: 10.3390/cells10112996] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 12/17/2022] Open
Abstract
Background: Upregulation of Heath Shock Protein 70 (HSP70) chaperones supports cancer cell survival. Their high homology causes a challenge to differentiate them in experimental or prevention and treatment strategies. The objective of this investigation was to determine similarities and differences of Hsp70, hsc70, Grp78 and Mortalin members of the HSP70 family encoded by HSPA1, HSPA8, HSPA5 and HSPA9 genes, respectively. Methods: Literature reviews were conducted using HSPA1, HSPA5, HSPA8 and HSPA9 gene or protein names or synonyms combined with biological or cancer-relevant terms. Ingenuity Pathway Analysis was used to identify and compare profiles of proteins that directly bind individual chaperones and their associated pathways. TCGA data was probed to identify associations of hsc70 with cancer patient survival. ClinicalTrials.gov was used to identify HSP70 family studies. Results: The chaperones have similar protein folding functions. Their different cellular effects are determined by co-chaperones and client proteins combined with their intra- and extra-cellular localizations. Their upregulation is associated with worse patient prognosis in multiple cancers and can stimulate tumor immune responses or drug resistance. Their inhibition selectively kills cancer over healthy cells. Conclusions: Differences in Hsp70, hsc70, Grp78 and mortalin provide opportunities to calibrate HSP70 inhibitors for individual cancers and combination therapies.
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Affiliation(s)
- Rajani Rai
- Gynecologic Oncology Section, Obstetrics and Gynecology Department, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (R.R.); (P.J.)
| | - Amy L. Kennedy
- Pathology Department, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA;
| | - Zitha Redempta Isingizwe
- Pharmaceutical Sciences Department, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA;
| | - Pouya Javadian
- Gynecologic Oncology Section, Obstetrics and Gynecology Department, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (R.R.); (P.J.)
| | - Doris Mangiaracina Benbrook
- Gynecologic Oncology Section, Obstetrics and Gynecology Department, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (R.R.); (P.J.)
- Pathology Department, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA;
- Pharmaceutical Sciences Department, Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA;
- Correspondence: ; Tel.: +1-405-271-5523
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15
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Costa-Beber LC, Heck TG, Fiorin PBG, Ludwig MS. HSP70 as a biomarker of the thin threshold between benefit and injury due to physical exercise when exposed to air pollution. Cell Stress Chaperones 2021; 26:889-915. [PMID: 34677749 PMCID: PMC8578518 DOI: 10.1007/s12192-021-01241-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 12/15/2022] Open
Abstract
Physical exercise has acute and chronic effects on inflammatory balance, metabolic regulation, and redox status. Exercise-induced adaptations are mediated by enhanced 70-kDa heat shock protein (HSP70) levels and an improved heat shock response (HSR). Therefore, exercise could be useful against disease conditions [obesity, diabetes mellitus (DM), and exposure to atmospheric pollutants] marked by an impaired HSR. However, exercise performed by obese or diabetic subjects under pollution conditions might also be dangerous at certain intensities. Intensity correlates with an increase in HSP70 levels during physical exercise until a critical point at which the effort becomes harmful and impairs the HSR. Establishing a unique biomarker able to indicate the exercise intensity on metabolism and cellular fatigue is essential to ensure adequate and safe exercise recommendations for individuals with obesity or DM who require exercise to improve their metabolic status and live in polluted regions. In this review, we examined the available evidence supporting our hypothesis that HSP70 could serve as a biomarker for determining the optimal exercise intensity for subjects with obesity or diabetes when exposed to air pollution and establishing the fine threshold between anti-inflammatory and pro-inflammatory exercise effects.
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Affiliation(s)
- Lílian Corrêa Costa-Beber
- Research Group in Physiology, Postgraduate Program in Integral Attention to Health, Department of Life Sciences, Regional University of Northwestern State's Rio Grande do Sul (UNIJUI), Rua do Comercio, 3000 - Bairro Universitario -, Ijuí, RS, 98700-000, Brazil.
- Postgraduation Program in Integral Attention to Health (PPGAIS-UNIJUI/UNICRUZ), Ijuí, RS, Brazil.
| | - Thiago Gomes Heck
- Research Group in Physiology, Postgraduate Program in Integral Attention to Health, Department of Life Sciences, Regional University of Northwestern State's Rio Grande do Sul (UNIJUI), Rua do Comercio, 3000 - Bairro Universitario -, Ijuí, RS, 98700-000, Brazil
- Postgraduation Program in Integral Attention to Health (PPGAIS-UNIJUI/UNICRUZ), Ijuí, RS, Brazil
| | - Pauline Brendler Goettems Fiorin
- Research Group in Physiology, Postgraduate Program in Integral Attention to Health, Department of Life Sciences, Regional University of Northwestern State's Rio Grande do Sul (UNIJUI), Rua do Comercio, 3000 - Bairro Universitario -, Ijuí, RS, 98700-000, Brazil
| | - Mirna Stela Ludwig
- Research Group in Physiology, Postgraduate Program in Integral Attention to Health, Department of Life Sciences, Regional University of Northwestern State's Rio Grande do Sul (UNIJUI), Rua do Comercio, 3000 - Bairro Universitario -, Ijuí, RS, 98700-000, Brazil
- Postgraduation Program in Integral Attention to Health (PPGAIS-UNIJUI/UNICRUZ), Ijuí, RS, Brazil
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16
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Osborne JO, Stewart IB, Borg DN, Beagley KW, Buhmann RL, Minett GM. Short-term heat acclimation preserves knee extensor torque but does not improve 20 km self-paced cycling performance in the heat. Eur J Appl Physiol 2021; 121:2761-2772. [PMID: 34148124 PMCID: PMC8416835 DOI: 10.1007/s00421-021-04744-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 06/10/2021] [Indexed: 01/16/2023]
Abstract
Purpose This study investigated the effect of 5 days of heat acclimation training on neuromuscular function, intestinal damage, and 20 km cycling (20TT) performance in the heat. Methods Eight recreationally trained males completed two 5-day training blocks (cycling 60 min day−1 at 50% peak power output) in a counter-balanced, cross-over design, with a 20TT completed before and after each block. Training was conducted in hot (HA: 34.9 ± 0.7 °C, 53 ± 4% relative humidity) or temperate (CON: 22.2 ± 2.6 °C, 65 ± 8% relative humidity) environment. All 20TTs were completed in the heat (35.1 ± 0.5 °C, 51 ± 4% relative humidity). Neuromuscular assessment of knee extensors (5 × 5 s maximum voluntary contraction; MVC) was completed before and after each 20TT and on the first and last days of each training block. Results MVC torque was statistically higher after 5 days of HA training compared to CON (mean difference = 14 N m [95% confidence interval; 6, 23]; p < 0.001; d = 0.77). However, 20TT performance after 5 days of HA training was not statistically different to CON, with a between-conditions mean difference in the completion time of 68 s [95% confidence interval; − 9, 145] (p = 0.076; d = 0.35). Conclusion Short-term heat acclimation training may increase knee extensor strength without changes in central fatigue or intestinal damage. Nevertheless, it is insufficient to improve 20 km self-paced cycling performance in the heat compared to workload-matched training in a temperate environment. These data suggest that recreationally trained athletes gain no worthwhile performance advantage from short-term heat-training before competing in the heat. Supplementary Information The online version contains supplementary material available at 10.1007/s00421-021-04744-y.
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Affiliation(s)
- John O Osborne
- School of Sport Sciences, UiT The Arctic University of Norway, Tromsø, Norway. .,School of Exercise and Nutrition Sciences, Queensland University of Technology (QUT), Brisbane, Australia. .,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.
| | - Ian B Stewart
- School of Exercise and Nutrition Sciences, Queensland University of Technology (QUT), Brisbane, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia
| | - David N Borg
- School of Exercise and Nutrition Sciences, Queensland University of Technology (QUT), Brisbane, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.,The Hopkins Centre, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia
| | - Kenneth W Beagley
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.,School of Biomedical Sciences, Queensland University of Technology (QUT), Brisbane, Australia
| | - Robert L Buhmann
- School of Health and Sport Sciences, University of the Sunshine Coast, Maroochydore, Australia
| | - Geoffrey M Minett
- School of Exercise and Nutrition Sciences, Queensland University of Technology (QUT), Brisbane, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia
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17
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Cao Y, Liu Y, Dong Q, Wang T, Niu C. Alterations in the gut microbiome and metabolic profile in rats acclimated to high environmental temperature. Microb Biotechnol 2021; 15:276-288. [PMID: 33620148 PMCID: PMC8719808 DOI: 10.1111/1751-7915.13772] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 01/26/2021] [Accepted: 01/30/2021] [Indexed: 12/29/2022] Open
Abstract
Heat acclimation (HA) is the best strategy to improve heat stress tolerance by inducing positive physiological adaptations. Evidence indicates that the gut microbiome plays a fundamental role in the development of HA, and modulation of gut microbiota can improve tolerance to heat exposure and decrease the risks of heat illness. In this study, for the first time, we applied 16S rRNA gene sequencing and untargeted liquid chromatography–mass spectrometry (LC‐MS) metabolomics to explore variations in the gut microbiome and faecal metabolic profiles in rats after HA. The gut microbiota of HA subjects exhibited higher diversity and richer microbes. HA altered the gut microbiota composition with significant increases in the genera Lactobacillus (a major probiotic) and Oscillospira alongside significant decreases in the genera Blautia and Allobaculum. The faecal metabolome was also significantly changed after HA, and among the 13 perturbed metabolites, (S)‐AL 8810 and celastrol were increased. Moreover, the two increased genera were positively correlated with the two upregulated metabolites and negatively correlated with the other 11 downregulated metabolites, while the correlations between the two decreased genera and the upregulated/downregulated metabolites were completely contrary. In summary, both the structure of the gut microbiome community and the faecal metabolome were improved after 28 days of HA. These findings provide novel insights regarding the improvement of the gut microbiome and its functions as a potential mechanism by which HA confers protection against heat stress.
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Affiliation(s)
- Yang Cao
- Department of Environmental Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China
| | - Ying Liu
- Department of Environmental Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China
| | - Qingyang Dong
- Department of Environmental Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China
| | - Tao Wang
- Department of Environmental Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China
| | - Chao Niu
- Department of Environmental Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China
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18
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Cooling During Endurance Cycling in the Heat: Blunted Core Temperature but Not Inflammatory Responses. Int J Sports Physiol Perform 2021; 16:865-870. [PMID: 33561824 DOI: 10.1123/ijspp.2020-0509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/20/2020] [Accepted: 07/16/2020] [Indexed: 11/18/2022]
Abstract
PURPOSE This study assessed the effects of cooling during endurance cycling (percooling) on changes in core body temperature (Tcore), inflammatory, and metabolic responses. METHODS A total of 12 male cyclists (peak oxygen uptake 60 [4] mL·kg-1·min-1) completed a 60-minute constant workload trial (55% of peak power output and ambient temperature 30.4°C [0.6°C]) in a randomized order both with (ICE) and without (CON) an ice vest. An ingestible capsule was used to measure Tcore. Blood samples were collected immediately before and after each trial to determine concentrations of blood lactate, serum cortisol, interleukin-6, and reactive oxygen and nitrogen species. RESULTS Tcore increased statistically (P < .001) both in CON (7.0% [1.4%], effect size [ES] = 6.3) and ICE (5.1% [1.1%], ES = 5.7). The increase in CON was statistically larger compared with ICE (P = .006, ES = 1.4). Concentrations of blood lactate (CON: 163% [63%], ES = 1.3; ICE: 149% [91%], ES = 1.3), cortisol (CON: 138% [123%], ES = 1.7; ICE: 81% [102%], ES = 1.0), and interleukin-6 (CON: 661% [324%], ES = 2.1; ICE: 624% [368%], ES = 1.2) statistically increased in both conditions (P < .01) to a similar extent. In addition, reactive oxygen and nitrogen species statistically decreased in both conditions (CON: -19.2% [14.9%], P = .002, ES = 0.9; ICE: -15.1% [16.5%], P = .02, ES = 0.9). No correlations were found between the changes of Tcore and blood parameters across the conditions. CONCLUSIONS Despite attenuated Tcore, similar inflammatory and metabolic responses were observed. Our findings suggest percooling to be a promising strategy to attenuate thermal strain without compromising physiological function.
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19
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Changes in gastrointestinal cell integrity after marathon running and exercise-associated collapse. Eur J Appl Physiol 2021; 121:1179-1187. [PMID: 33512586 DOI: 10.1007/s00421-021-04603-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Accepted: 01/10/2021] [Indexed: 01/07/2023]
Abstract
PURPOSE Endurance exercise and hyperthermia are associated with compromised intestinal permeability and endotoxaemia. The presence of intestinal fatty acid-binding protein (I-FABP) in the systemic circulation suggests intestinal wall damage, but this marker has not previously been used to investigate intestinal integrity after marathon running. METHODS Twenty-four runners were recruited as controls prior to completing a standard marathon and had sequential I-FABP measurements before and on completion of the marathon, then at four and 24 h later. Eight runners incapacitated with exercise-associated collapse (EAC) with hyperthermia had I-FABP measured at the time of collapse and 1 hour later. RESULTS I-FABP was increased immediately on completing the marathon (T0; 2593 ± 1373 ng·l-1) compared with baseline (1129 ± 493 ng·l-1; p < 0.01) in the controls, but there was no significant difference between baseline and the levels at four hours (1419 ± 1124 ng·l-1; p = 0.7), or at 24 h (1086 ± 302 ng·l-1; p = 0.5). At T0, EAC cases had a significantly higher I-FABP concentration (15,389 ± 8547 ng.l-1) compared with controls at T0 (p < 0.01), and remained higher at 1 hour after collapse (13,951 ± 10,476 ng.l-1) than the pre-race control baseline (p < 0.05). CONCLUSION I-FABP is a recently described biomarker whose presence in the circulation is associated with intestinal wall damage. I-FABP levels increase after marathon running and increase further if the endurance exercise is associated with EAC and hyperthermia. After EAC, I-FABP remains high in the circulation for an extended period, suggesting ongoing intestinal wall stress.
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20
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Mang ZA, Fennel ZJ, Realzola RA, Wells AD, McKenna Z, Droemer C, Houck JM, Nava RC, Mermier CM, Amorim FT. Heat acclimation during low‐intensity exercise increases and Hsp72, but not markers of mitochondrial biogenesis and oxidative phosphorylation, in skeletal tissue. Exp Physiol 2020; 106:290-301. [DOI: 10.1113/ep088563] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 07/02/2020] [Indexed: 12/24/2022]
Affiliation(s)
- Zachary A. Mang
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Zachary J. Fennel
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Rogelio A. Realzola
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Andrew D. Wells
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Zachary McKenna
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Christian Droemer
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Jonathan M. Houck
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Roberto C. Nava
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Christine M. Mermier
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
| | - Fabiano T. Amorim
- Department of Health, Exercise, and Sport Science University of New Mexico Albuquerque NM 87131 USA
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