scholarly journals Temperate-Water Immersion as a Treatment for Hyperthermic Humans Wearing American Football Uniforms

2017 ◽  
Vol 52 (8) ◽  
pp. 747-752 ◽  
Author(s):  
Kevin C. Miller ◽  
Tyler Truxton ◽  
Blaine Long
Keyword(s):  
Rectal Temperature ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
American Football ◽  
Body Core Temperature ◽  
Temperate Water ◽  
Cooling Rates ◽  
Before And After

Context:  Cold-water immersion (CWI; 10°C) can effectively reduce body core temperature even if a hyperthermic human is wearing a full American football uniform (PADS) during treatment. Temperate-water immersion (TWI; 21°C) may be an effective alternative to CWI if resources for the latter (eg, ice) are unavailable. Objective:  To measure rectal temperature (Trec) cooling rates, thermal sensation, and Environmental Symptoms Questionnaire (ESQ) scores of participants wearing PADS or shorts, undergarments, and socks (NOpads) before, during, and after TWI. Design:  Crossover study. Setting:  Laboratory. Patients or Other Participants:  Thirteen physically active, unacclimatized men (age = 22 ± 2 years, height = 182.3 ± 5.2 cm, mass = 82.5 ± 13.4 kg, body fat = 10% ± 4%, body surface area = 2.04 ± 0.16 m2). Intervention(s):  Participants exercised in the heat (40°C, 50% relative humidity) on 2 days while wearing PADS until Trec reached 39.5°C. Participants then underwent TWI while wearing either NOpads or PADS until Trec reached 38°C. Thermal sensation and ESQ responses were collected at various times before and after exercise. Main Outcome Measure(s):  Temperate-water immersion duration (minutes), Trec cooling rates (°C/min), thermal sensation, and ESQ scores. Results:  Participants had similar exercise times (NOpads = 38.1 ± 8.1 minutes, PADS = 38.1 ± 8.5 minutes), hypohydration levels (NOpads = 1.1% ± 0.2%, PADS = 1.2% ± 0.2%), and thermal sensation ratings (NOpads = 7.1 ± 0.4, PADS = 7.3 ± 0.4) before TWI. Rectal temperature cooling rates were similar between conditions (NOpads = 0.12°C/min ± 0.05°C/min, PADS = 0.13°C/min ± 0.05°C/min; t12 = 0.82, P = .79). Thermal sensation and ESQ scores were unremarkable between conditions over time. Conclusions:  Temperate-water immersion produced acceptable (ie, >0.08°C/min), though not ideal, cooling rates regardless of whether PADS or NOpads were worn. If a football uniform is difficult to remove or the patient is noncompliant, clinicians should begin water-immersion treatment with the athlete fully equipped. Clinicians should strive to use CWI to treat severe hyperthermia, but when CWI is not feasible, TWI should be the next treatment option because its cooling rate was higher than the rates of other common modalities (eg, ice packs, fanning).

scholarly journals Necessity of Removing American Football Uniforms From Humans With Hyperthermia Before Cold-Water Immersion

2015 ◽  
Vol 50 (12) ◽  
pp. 1240-1246 ◽  
Author(s):  
Kevin C. Miller ◽  
Blaine C. Long ◽  
Jeffrey Edwards
Keyword(s):  
Sports Medicine ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Heat Stroke ◽  
Cold Water Immersion ◽  
American Football ◽  
Body Core Temperature ◽  
Cooling Rates ◽  
National Athletic Trainers Association

Context  The National Athletic Trainers' Association and the American College of Sports Medicine have recommended removing American football uniforms from athletes with exertional heat stroke before cold-water immersion (CWI) based on the assumption that the uniform impedes rectal temperature (Trec) cooling. Few experimental data exist to verify or disprove this assumption and the recommendations. Objectives  To compare CWI durations, Trec cooling rates, thermal sensation, intensity of environmental symptoms, and onset of shivering when hyperthermic participants wore football uniforms during CWI or removed the uniforms immediately before CWI. Design  Crossover study. Setting  Laboratory. Patients or Other Participants  Eighteen hydrated, physically active men (age = 22 ± 2 years, height = 182.5 ± 6.1 cm, mass = 85.4 ± 13.4 kg, body fat = 11% ± 5%, body surface area = 2.1 ± 0.2 m2) volunteered. Intervention(s)  On 2 days, participants exercised in the heat (approximately 40°C, approximately 40% relative humidity) while wearing a full American football uniform (shoes; crew socks; undergarments; shorts; game pants; undershirt; shoulder pads; jersey; helmet; and padding over the thighs, knees, hips, and tailbone [PADS]) until Trec reached 39.5°C. Next, participants immersed themselves in water that was approximately 10°C while wearing either undergarments, shorts, and crew socks (NOpads) or PADS without shoes until Trec reached 38°C. Main Outcome Measure(s)  The CWI duration (minutes) and Trec cooling rates (°C/min). Results  Participants had similar exercise times (NOpads = 40.8 ± 4.9 minutes, PADS = 43.2 ± 4.1 minutes; t17 = 2.0, P = .10), hypohydration levels (NOpads = 1.5% ± 0.3%, PADS = 1.6% ± 0.4%; t17 = 1.3, P = .22), and thermal-sensation ratings (NOpads = 7.2 ± 0.3, PADS = 7.1 ± 0.5; P > .05) before CWI. The CWI duration (median [interquartile range]; NOpads = 6.0 [5.4] minutes, PADS = 7.3 [9.8] minutes; z = 2.3, P = .01) and Trec cooling rates (NOpads = 0.28°C/min ± 0.14°C/min, PADS = 0.21°C/min ± 0.11°C/min; t17 = 2.2, P = .02) differed between uniform conditions. Conclusions  Whereas participants cooled faster in NOpads, we still considered the PADS cooling rate to be acceptable (ie, >0.16°C/min). Therefore, if clinicians experience difficulty removing PADS or CWI treatment is delayed, they may immerse fully equipped hyperthermic football players in CWI and maintain acceptable Trec cooling rates. Otherwise, PADS should be removed preimmersion to ensure faster body core temperature cooling.

scholarly journals Cooling Rates of Hyperthermic Humans Wearing American Football Uniforms When Cold-Water Immersion Is Delayed

2018 ◽  
Vol 53 (12) ◽  
pp. 1200-1205 ◽  
Author(s):  
Kevin C. Miller ◽  
Timothy A. Di Mango ◽  
Grace E. Katt
Keyword(s):  
Rectal Temperature ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Heat Stroke ◽  
Cold Water Immersion ◽  
American Football ◽  
Exertional Heat Stroke ◽  
Cooling Rates ◽  
Treatment Delays

Context Treatment delays can be contributing factors in the deaths of American football athletes from exertional heat stroke. Ideally, clinicians begin cold-water immersion (CWI) to reduce rectal temperature (Trec) to <38.9°C within 30 minutes of collapse. If delays occur, experts recommend Trec cooling rates that exceed 0.15°C/min. Whether treatment delays affect CWI cooling rates or perceptual variables when football uniforms are worn is unknown. Objective To answer 3 questions: (1) Does wearing a football uniform and delaying CWI by 5 minutes or 30 minutes affect Trec cooling rates? (2) Do Trec cooling rates exceed 0.15°C/min when treatment delays have occurred and individuals wear football uniforms during CWI? (3) How do treatment delays affect thermal sensation and Environmental Symptoms Questionnaire responses? Design Crossover study. Setting Laboratory. Patients or Other Participants Ten physically active men (age = 22 ± 2 y, height = 183.0 ± 6.9 cm, mass = 78.9 ± 6.0 kg). Intervention(s) On 2 days, participants wore American football uniforms and exercised in the heat until Trec was 39.75°C. Then they sat in the heat, with equipment on, for either 5 or 30 minutes before undergoing CWI (10.6°C ± 0.1°C) until Trec reached 37.75°C. Main Outcome Measure(s) Rectal temperature and CWI duration were used to calculate cooling rates. Thermal sensation was measured pre-exercise, postexercise, postdelay, and post-CWI. Responses to the Environmental Symptoms Questionnaire were obtained pre-exercise, postdelay, and post-CWI. Results The Trec cooling rates exceeded recommendations and were unaffected by treatment delays (5-minute delay = 0.20°C/min ± 0.07°C/min, 30-minute delay = 0.19°C/min ± 0.05°C/min; P = .4). Thermal sensation differed between conditions only postdelay (5-minute delay = 6.5 ± 0.6, 30-minute delay = 5.5 ± 0.7; P < .05). Environmental Symptoms Questionnaire responses differed between conditions only postdelay (5-minute delay = 27 ± 15, 30-minute delay = 16 ± 12; P < .05). Conclusions Treatment delays and football equipment did not impair CWI's effectiveness. Because participants felt cooler and better after the 30-minute delay despite still having elevated Trec, clinicians should use objective measurements (eg, Trec) to guide their decision making for patients with possible exertional heat stroke.

scholarly journals Precooling, Hyperthermia, and Postexercise Cooling Rates in Humans Wearing American Football Uniforms

2019 ◽  
Vol 54 (7) ◽  
pp. 758-764 ◽  
Author(s):  
Jeremy Taylor ◽  
Kevin C. Miller
Keyword(s):  
Heart Rate ◽  
Rectal Temperature ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Rating Of Perceived Exertion ◽  
American Football ◽  
Whole Body ◽  
Cooling Rates

Context Exertional heatstroke is one of the leading causes of death in American football players. Precooling (PC) with whole-body cold-water immersion (CWI) may prevent severe hyperthermia and, possibly, exertional heatstroke. However, it is unknown how much PC delays severe hyperthermia when participants wear American football uniforms during exercise in the heat. Does PC alter the effectiveness of CWI once participants become hyperthermic or affect perceptual variables during exercise? Objectives We asked 3 questions: (1) Does PC affect how quickly participants become hyperthermic during exercise in the heat? (2) Does PC before exercise affect rectal temperature (Trec) cooling rates once participants become hyperthermic? (3) Does PC affect perceptual variables such as rating of perceived exertion (RPE), thermal sensation, and environmental symptoms questionnaire (ESQ) responses? Design Crossover study. Setting Laboratory. Patients or Other Participants Twelve physically active males (age = 24 ± 4 years, height = 181.8 ± 8.4 cm, mass = 79.9 ± 10.3 kg). Intervention(s) On PC days, participants completed 15 minutes of CWI (9.98°C ± 0.04°C). They donned American football uniforms and exercised in the heat (temperature = 39.1°C ± 0.3°C, relative humidity = 36% ± 2%) until Trec was 39.5°C. While wearing equipment, they then underwent CWI until Trec was 38°C. Control-day procedures were the same except for the PC intervention. Main Outcome Measure(s) Rectal temperature, heart rate, thermal sensation, RPE, and ESQ responses were measured throughout testing. The duration of cold-water immersion was used in conjunction with Trec to calculate cooling rates. Results Precooling allowed participants to exercise 17.6 ± 3.6 minutes longer before reaching 39.5°C (t11 = 17.0, P < .001). Precooling did not affect postexercise CWI Trec cooling rates (PC = 0.18°C/min ± 0.06°C/min, control = 0.20°C/min ± 0.09°C/min; t11 = 0.9, P = .17); ESQ responses (F2,24 = 1.3, P = .3); or RPE (F2,22 = 2.9, P = .07). Precooling temporarily lowered thermal sensation (F3,26 = 21.7, P < .001) and heart rate (F3,29 = 21.0, P < .001) during exercise. Conclusions Because PC delayed hyperthermia without negatively affecting perceptual variables or CWI effectiveness, clinicians may consider implementing PC along with other proven strategies for preventing heat illness (eg, acclimatization).

scholarly journals Physiologic and Perceptual Responses to Cold-Shower Cooling After Exercise-Induced Hyperthermia

2016 ◽  
Vol 51 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Cory L. Butts ◽  
Brendon P. McDermott ◽  
Brian J. Buening ◽  
Jeffrey A. Bonacci ◽  
Matthew S. Ganio ◽  
...  
Keyword(s):  
Heart Rate ◽  
Cooling Rate ◽  
Rectal Temperature ◽  
Muscle Pain ◽  
Cold Water ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Heat Stroke ◽  
Cold Water Immersion ◽  
Exercise Induced

Exercise conducted in hot, humid environments increases the risk for exertional heat stroke (EHS). The current recommended treatment of EHS is cold-water immersion; however, limitations may require the use of alternative resources such as a cold shower (CS) or dousing with a hose to cool EHS patients.Context: To investigate the cooling effectiveness of a CS after exercise-induced hyperthermia.Objective: Randomized, crossover controlled study.Design: Environmental chamber (temperature = 33.4°C ± 2.1°C; relative humidity = 27.1% ± 1.4%).Setting: Seventeen participants (10 male, 7 female; height = 1.75 ± 0.07 m, body mass = 70.4 ± 8.7 kg, body surface area = 1.85 ± 0.13 m2, age range = 19–35 years) volunteered.Patients or Other Participants: On 2 occasions, participants completed matched-intensity volitional exercise on an ergometer or treadmill to elevate rectal temperature to ≥39°C or until participant fatigue prevented continuation (reaching at least 38.5°C). They were then either treated with a CS (20.8°C ± 0.80°C) or seated in the chamber (control [CON] condition) for 15 minutes.Intervention(s): Rectal temperature, calculated cooling rate, heart rate, and perceptual measures (thermal sensation and perceived muscle pain).Main Outcome Measure(s): The rectal temperature (P = .98), heart rate (P = .85), thermal sensation (P = .69), and muscle pain (P = .31) were not different during exercise for the CS and CON trials (P > .05). Overall, the cooling rate was faster during CS (0.07°C/min ± 0.03°C/min) than during CON (0.04°C/min ± 0.03°C/min; t16 = 2.77, P = .01). Heart-rate changes were greater during CS (45 ± 20 beats per minute) compared with CON (27 ± 10 beats per minute; t16 = 3.32, P = .004). Thermal sensation was reduced to a greater extent with CS than with CON (F3,45 = 41.12, P < .001).Results: Although the CS facilitated cooling rates faster than no treatment, clinicians should continue to advocate for accepted cooling modalities and use CS only if no other validated means of cooling are available.Conclusions:

scholarly journals Cold-Water Immersion for Hyperthermic Humans Wearing American Football Uniforms

2015 ◽  
Vol 50 (8) ◽  
pp. 792-799 ◽  
Author(s):  
Kevin C. Miller ◽  
Erik E. Swartz ◽  
Blaine C. Long
Keyword(s):  
Effect Size ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Current Treatment ◽  
The Body ◽  
American Football ◽  
Cooling Rates ◽  
Physically Active ◽  
Core Cooling

Context Current treatment recommendations for American football players with exertional heatstroke are to remove clothing and equipment and immerse the body in cold water. It is unknown if wearing a full American football uniform during cold-water immersion (CWI) impairs rectal temperature (Trec) cooling or exacerbates hypothermic afterdrop. Objective To determine the time to cool Trec from 39.5°C to 38.0°C while participants wore a full American football uniform or control uniform during CWI and to determine the uniform's effect on Trec recovery postimmersion. Design Crossover study. Setting Laboratory. Patients or Other Participants A total of 18 hydrated, physically active, unacclimated men (age = 22 ± 3 years, height = 178.8 ± 6.8 cm, mass = 82.3 ± 12.6 kg, body fat = 13% ± 4%, body surface area = 2.0 ± 0.2 m2). Intervention(s) Participants wore the control uniform (undergarments, shorts, crew socks, tennis shoes) or full uniform (control plus T-shirt; tennis shoes; jersey; game pants; padding over knees, thighs, and tailbone; helmet; and shoulder pads). They exercised (temperature approximately 40°C, relative humidity approximately 35%) until Trec reached 39.5°C. They removed their T-shirts and shoes and were then immersed in water (approximately 10°C) while wearing each uniform configuration; time to cool Trec to 38.0°C (in minutes) was recorded. We measured Trec (°C) every 5 minutes for 30 minutes after immersion. Main Outcome Measure(s) Time to cool from 39.5°C to 38.0°C and Trec. Results The Trec cooled to 38.0°C in 6.19 ± 2.02 minutes in full uniform and 8.49 ± 4.78 minutes in control uniform (t17 = −2.1, P = .03; effect size = 0.48) corresponding to cooling rates of 0.28°C·min−1 ± 0.12°C·min−1 in full uniform and 0.23°C·min−1 ± 0.11°C·min−1 in control uniform (t17 = 1.6, P = .07, effect size = 0.44). The Trec postimmersion recovery did not differ between conditions over time (F1,17 = 0.6, P = .59). Conclusions We speculate that higher skin temperatures before CWI, less shivering, and greater conductive cooling explained the faster cooling in full uniform. Cooling rates were considered ideal when the full uniform was worn during CWI, and wearing the full uniform did not cause a greater postimmersion hypothermic afterdrop. Clinicians may immerse football athletes with hyperthermia wearing a full uniform without concern for negatively affecting body-core cooling.

scholarly journals EFEKTIVITAS COLD WATER IMMERSION SUHU 15° C DAN 25° C TERHADAP PERBAIKAN DAYA TAHAN DAN PERSEPSI NYERI OTOT TUNGKAI PADA PEMAIN SEPAK BOLA USIA DINI

MEDIKORA ◽  
2019 ◽  
Vol 18 (1) ◽  
pp. 12-16
Author(s):  
Muhammad Rifqi Fatoni ◽  
Sigit Nugroho
Keyword(s):  
Pain Perception ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Wilcoxon Test ◽  
Rank Test ◽  
Muscle Endurance ◽  
Before And After ◽  
Post Test ◽  
Signed Rank Test

Akumulasi pertandingan dengan masa pemulihan yang singkat menyebabkan kelelahan, kerusakan dan inflamasi otot yang dapat menurunkan daya tahan otot dan meningkatkan resiko cedera. Pada keadaan cedera akut, penggunaan terapi dingin dapat mencegah kerusakan jaringan yang lebih luas. Penelitian ini bertujuan untuk mengetahui efektivitas Cold Water Immersion (CWI) suhu 15°C dan 25°C terhadap daya tahan dan persepsi nyeri otot tungkai pada pemain sepak bola usia dini. Desain yang digunakan dalam penelitian ini adalah eksperimen semu dengan pola Two Group Pretest-Posttest. Instrumen yang digunakan adalah tes dan pengukuran nyeri dan daya tahan otot tungkai. Subjek penelitian ini adalah atlet sepak bola Sekolah Sepak Bola (SSB) KKK Klajuaran usia 9-11 tahun. Teknik sampel menggunakan quota sampling dengan subyek sebanyak 14 orang. Subyek dibagi menjadi dua kelompok yaitu, perlakuan CWI 15°C (G15) dan CWI suhu 25°C (G25). Data pretest pada kedua perlakuan dan data post test kedua perlakuan diuji dengan uji Mann Whitney. Daya tahan otot dan persepsi nyeri sebelum dan sesudah perlakuan pada masing masing kelompok terkumpul dianalisis secara deskriptif dan diuji dengan analisis Wilcoxon Signed Rank Test. Uji efektivitas dihitung dengan membandingkan selisih data post test dan pretest terhadap data pretest. Tidak ditemukan perbedaan daya tahan otot dan persepsi nyeri sebelum dan sesudah perlakuan antara kedua kelompok perlakuan. Pada kelompok G15 terjadi penurunan persepsi nyeri sebesar 55% dengan uji wilcoxon dengan nilai p = 0,018, akan tetapi tidak ditemukan perubahan daya tahan otot setelah perlakuan. Hasil yang sama ditemukan pada kelompok G25 dimana terdapat penurunan persepsi nyeri sebesar 58% dengan uji wilcoxon dengan p = 0,018 serta tidak ditemukan perubahan daya tahan otot tungkai. Dapat disimpulkan bahwa perlakuan CWI 15°C dan 25°C dapat menurunkan nyeri tapi tidak mempengaruhi daya tahan otot. Tidak terdapat perbedaan efektivitas kedua jenis perlakuan tersebut dalam menurunkan persepsi nyeri dan meningkatkan daya tahan otot. EFFECTIVENESS OF COLD WATER IMMERSION TEMPERATURE OF 15 ° C AND 25° C AGAINST IMPROVEMENT IN ENDURANCE AND PERCEPTION OF LEG MUSCLE PAIN IN EARLY AGE FOOTBALL PLAYERSAbstractAccumulation of matches with a short recovery period causes fatigue, damage and inflammation of the muscles which can reduce muscle endurance and increase the risk of injury. In the case of acute injury, the use of cold therapy can prevent damage to broader tissue. This study aims to determine the effectiveness of Cold Water Immersion (CWI) temperatures of 15 ° C and 25 ° C on the endurance and perception of leg muscle pain in early age soccer players.The design used in this study was quasi-experimental with Two Group Pretest-Posttest patterns. The instrument used was a test and measurement of pain and endurance of leg muscles. The subjects of this study were the soccer athletes of Klajuaran KKK Soccer School (SSB) aged 9-11 years. The sampling technique uses quota sampling with subjects as many as 14 people. The subjects were divided into two groups namely, 15 ° C (G15) CWI treatment and 25 ° C (G25) CWI treatment. Pretest data on both treatments and post-test data on both treatments were tested with the Mann Whitney test. Muscle endurance and pain perception before and after treatment in each group collected were analyzed descriptively and tested with the Wilcoxon Signed Rank Test analysis. The effectiveness test is calculated by comparing the difference between the post test and pretest data against the pretest data. There were no differences in muscle endurance and pain perception before and after treatment between the two treatment groups. In the G15 group there was a decrease in pain perception by 55% with the Wilcoxon test with a value of p = 0.018, but there was no change in muscle endurance after treatment. Similar results were found in the G25 group where there was a decrease in pain perception by 58% with the Wilcoxon test with p = 0.018 and no changes in endurance of leg muscles were found. It can be concluded that the CWI treatment of 15 ° C and 25 ° C can reduce pain but does not affect muscular endurance. There is no difference in the effectiveness of the two types of treatment in reducing pain perception and increasing muscle endurance.

scholarly journals Cold water immersion attenuates anabolic signaling and skeletal muscle fiber hypertrophy, but not strength gain, following whole-body resistance training

2019 ◽  
Vol 127 (5) ◽  
pp. 1403-1418 ◽  
Author(s):  
Jackson J. Fyfe ◽  
James R. Broatch ◽  
Adam J. Trewin ◽  
Erik D. Hanson ◽  
Christos K. Argus ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Resistance Training ◽  
Protein Content ◽  
Muscle Fiber ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Post Exercise ◽  
Leg Press ◽  
Before And After

We determined the effects of cold water immersion (CWI) on long-term adaptations and post-exercise molecular responses in skeletal muscle before and after resistance training. Sixteen men (22.9 ± 4.6 y; 85.1 ± 17.9 kg; mean ± SD) performed resistance training (3 day/wk) for 7 wk, with each session followed by either CWI [15 min at 10°C, CWI (COLD) group, n = 8] or passive recovery (15 min at 23°C, control group, n = 8). Exercise performance [one-repetition maximum (1-RM) leg press and bench press, countermovement jump, squat jump, and ballistic push-up], body composition (dual X-ray absorptiometry), and post-exercise (i.e., +1 and +48 h) molecular responses were assessed before and after training. Improvements in 1-RM leg press were similar between groups [130 ± 69 kg, pooled effect size (ES): 1.53 ± 90% confidence interval (CI) 0.49], whereas increases in type II muscle fiber cross-sectional area were attenuated with CWI (−1,959 ± 1,675 µM2 ; ES: −1.37 ± 0.99). Post-exercise mechanistic target of rapamycin complex 1 signaling (rps6 phosphorylation) was blunted for COLD at post-training (POST) +1 h (−0.4-fold, ES: −0.69 ± 0.86) and POST +48 h (−0.2-fold, ES: −1.33 ± 0.82), whereas basal protein degradation markers (FOX-O1 protein content) were increased (1.3-fold, ES: 2.17 ± 2.22). Training-induced increases in heat shock protein (HSP) 27 protein content were attenuated for COLD (−0.8-fold, ES: −0.94 ± 0.82), which also reduced total HSP72 protein content (−0.7-fold, ES: −0.79 ± 0.57). CWI blunted resistance training-induced muscle fiber hypertrophy, but not maximal strength, potentially via reduced skeletal muscle protein anabolism and increased catabolism. Post-exercise CWI should therefore be avoided if muscle hypertrophy is desired. NEW & NOTEWORTHY This study adds to existing evidence that post-exercise cold water immersion attenuates muscle fiber growth with resistance training, which is potentially mediated by attenuated post-exercise increases in markers of skeletal muscle anabolism coupled with increased catabolism and suggests that blunted muscle fiber growth with cold water immersion does not necessarily translate to impaired strength development.

Can Temperate-Water Immersion Effectively Reduce Rectal Temperature in Exertional Heat Stroke? A Critically Appraised Topic

2017 ◽  
Vol 26 (5) ◽  
pp. 447-451 ◽  
Author(s):  
Tyler T. Truxton ◽  
Kevin C. Miller
Keyword(s):  
Rectal Temperature ◽  
Water Immersion ◽  
Heat Stroke ◽  
Medical Emergency ◽  
Clinical Scenario ◽  
Clinical Question ◽  
Temperate Water ◽  
Bottom Line ◽  
Exertional Heat Stroke ◽  
Cooling Rates

Clinical Scenario:Exertional heat stroke (EHS) is a medical emergency which, if left untreated, can result in death. The standard of care for EHS patients includes confirmation of hyperthermia via rectal temperature (Trec) and then immediate cold-water immersion (CWI). While CWI is the fastest way to reduce Trec, it may be difficult to lower and maintain water bath temperature in the recommended ranges (1.7°C–15°C [35°F–59°F]) because of limited access to ice and/or the bath being exposed to high ambient temperatures for long periods of time. Determining if Trec cooling rates are acceptable (ie, >0.08°C/min) when significantly hyperthermic humans are immersed in temperate water (ie, ≥20°C [68°F]) has applications for how EHS patients are treated in the field.Clinical Question:Are Trec cooling rates acceptable (≥0.08°C/min) when significantly hyperthermic humans are immersed in temperate water?Summary of Findings:Trec cooling rates of hyperthermic humans immersed in temperate water (≥20°C [68°F]) ranged from 0.06°C/min to 0.19°C/min. The average Trec cooling rate for all examined studies was 0.11±0.06°C/min.Clinical Bottom Line:Temperature water immersion (TWI) provides acceptable (ie, >0.08°C/min) Trec cooling rates for hyperthermic humans post-exercise. However, CWI cooling rates are higher and should be used if feasible (eg, access to ice, shaded treatment areas).Strength of Recommendation:The majority of evidence (eg, Level 2 studies with PEDro scores ≥5) suggests TWI provides acceptable, though not ideal, Trec cooling. If possible, CWI should be used instead of TWI in EHS scenarios.

Effect of alcohol on thermal balance of man in cold water

1979 ◽  
Vol 57 (8) ◽  
pp. 860-865 ◽  
Author(s):  
G. R. Fox ◽  
J. S. Hayward ◽  
G. N. Hobson
Keyword(s):  
Metabolic Rate ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Cooling Rates ◽  
Rate Of Increase ◽  
Exercise Period ◽  
Hot Bath ◽  
Core Cooling ◽  
Skin Temperatures

The effects of alcohol on core cooling rates (rectal and tympanic), skin temperatures, and metabolic rate were determined for 10 subjects rendered hypothermic by immersion for 45 min in 10 °C water. Experiments were duplicated with and without a 20-min period of exercise at the beginning of cold water immersion. Measurements were continued during rewarming in a hot bath. With blood alcohol concentrations averaging 82 mg 100 mL−1, core cooling rates and changes in skin temperatures were insignificantly different from controls, even if the exercise period was imposed. Alcohol reduced shivering metabolic rate by an overall mean of 13%, insufficient to affect cooling rate. Alcohol had no effect on metabolic rate during exercise. During rewarming by hot bath, the amount of 'afterdrop' and rate of increase in core temperature were unaffected by alcohol. It was concluded that alcohol in a moderate dosage does not influence the rate of progress into hypothermia or subsequent, efficient rewarming. This emphasizes that the high incidence of alcohol involvement in water-related fatalities is due to alcohol potentiation of accidents rather than any direct effects on cold water survival, although very high doses of alcohol leading to unconsciousness would increase rate of progress into hypothermia.

scholarly journals Cold-Water Immersion Cooling Rates in Football Linemen and Cross-Country Runners With Exercise-Induced Hyperthermia

2017 ◽  
Vol 52 (10) ◽  
pp. 902-909 ◽  
Author(s):  
Sandra Fowkes Godek ◽  
Katherine E. Morrison ◽  
Gregory Scullin
Keyword(s):  
Cooling Rate ◽  
Body Mass ◽  
Body Fat ◽  
Cold Water ◽  
Water Immersion ◽  
Cold Water Immersion ◽  
Physical Characteristics ◽  
Cooling Rates ◽  
Cross Country ◽  
Cross Country Runners

Context:  Ideal and acceptable cooling rates in hyperthermic athletes have been established in average-sized participants. Football linemen (FBs) have a small body surface area (BSA)-to-mass ratio compared with smaller athletes, which hinders heat dissipation. Objective:  To determine cooling rates using cold-water immersion in hyperthermic FBs and cross-country runners (CCs). Design:  Cohort study. Setting:  Controlled university laboratory. Patients or Other Participants:  Nine FBs (age = 21.7 ± 1.7 years, height = 188.7 ± 4 cm, mass = 128.1 ± 18 kg, body fat = 28.9% ± 7.1%, lean body mass [LBM] = 86.9 ± 19 kg, BSA = 2.54 ± 0.13 m2, BSA/mass = 201 ± 21.3 cm2/kg, and BSA/LBM = 276.4 ± 19.7 cm2/kg) and 7 CCs (age = 20 ± 1.8 years, height = 176 ± 4.1 cm, mass = 68.7 ± 6.5 kg, body fat = 10.2% ± 1.6%, LBM = 61.7 ± 5.3 kg, BSA = 1.84 ± 0.1 m2, BSA/mass = 268.3 ± 11.7 cm2/kg, and BSA/LBM = 298.4 ± 11.7 cm2/kg). Intervention(s):  Participants ingested an intestinal sensor, exercised in a climatic chamber (39°C, 40% relative humidity) until either target core temperature (Tgi) was 39.5°C or volitional exhaustion was reached, and were immediately immersed in a 10°C circulated bath until Tgi declined to 37.5°C. A general linear model repeated-measures analysis of variance and independent t tests were calculated, with P < .05. Main Outcome Measure(s):  Physical characteristics, maximal Tgi, time to reach 37.5°C, and cooling rate. Results:  Physical characteristics were different between groups. No differences existed in environmental measures or maximal Tgi (FBs = 39.12°C ± 0.39°C, CCs = 39.38°C ± 0.19°C; P = .12). Cooling times required to reach 37.5°C (FBs = 11.4 ± 4 minutes, CCs = 7.7 ± 0.06 minutes; P < .002) and therefore cooling rates (FBs = 0.156°C·min−1 ± 0.06°C·min−1, CCs = .255°C·min−1 ± 0.05°C·min−1; P < .002) were different. Strong correlations were found between cooling rate and body mass (r = −0.76, P < .001), total BSA (r = −0.74, P < .001), BSA/mass (r = 0.73, P < .001), LBM/mass (r = 0.72, P < .002), and LBM (r = −0.72, P < .002). Conclusions:  With cold-water immersion, the cooling rate in CCs (0.255°C·min−1) was greater than in FBs (0.156°C·min−1); however, both were considered ideal (≥0.155°C·min−1). Athletic trainers should realize that it likely takes considerably longer to cool large hyperthermic American-football players (>11 minutes) than smaller, leaner athletes (7.7 minutes). Cooling rates varied widely from 0.332°C·min−1 in a small runner to only 0.101°C·min−1 in a lineman, supporting the use of rectal temperature for monitoring during cooling.

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