BIOMAT Database Logo BIOMAT Database Logo

Heat Exposure and Hypohydration Exacerbate Physiological Strain During Load Carrying. 2019

Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Human Performance Laboratory, Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut.

Adams, EL, Casa, DJ, Huggins, RA, DeMartini-Nolan, JK, Stearns, RL, Kennedy, RM, Bosworth, MM, DiStefano, LJ, Armstrong, LE, and Maresh, CM. Heat exposure and hypohydration exacerbate physiological strain during load carrying. J Strength Cond Res 33(3): 727-735, 2019-Heat exposure and hypohydration induce physiological and psychological strain during exercise; however, it is unknown if the separate effects of heat exposure and hypohydration are synergistic when co-occurring during loaded exercise. This study compared separate and combined effects of heat exposure and hypohydration on physiological strain, mood state, and visual vigilance during loaded exercise. Twelve men (mean ± SD; age, 20 ± 2 years; body mass, 74.0 ± 8.2 kg; maximal oxygen uptake, 57.0 ± 6.0 ml·kg·min) completed 4 trials under the following conditions: euhydrated temperate (EUT), hypohydrated temperate (HYT), euhydrated hot (EUH), and hypohydrated hot (HYH). Exercise was 90 minutes of treadmill walking (∼50% V[Combining Dot Above]O2max, 5% grade) while carrying a 45-lb rucksack. Profile of Mood States and the Scanning Visual Vigilance Test were completed before and after exercise. The separate effects of heat exposure (EUH) and hypohydration (HYT) on post-exercise rectal temperature (Tre) were similar (38.25 ± 0.63°C vs. 38.22 ± 0.29°C, respectively, p > 0.05), whereas in combination (HYH), post-exercise Tre was far greater (39.32 ± 0.43°C). Increase in Tre per 1% body mass loss (BML) for HYH (vs. EUH) was greater than HYT (vs. EUT) (0.32 vs. 0.04°C, respectively, p = 0.02); heart rate increase per 1% BML for HYH (vs. EUH) was 7 b·min compared with HYT (vs. EUT) at 3 b·min (p = 0.30). Hypohydrated hot induced greater mood disturbance (post-exercise - pre-exercise) (35 ± 21 units) compared with other conditions (EUT = 3 ± 9 units; HYT = 3 ± 16 units; EUH = 16 ± 26 units; p < 0.001). No differences occurred in visual vigilance (p > 0.05). Independently, heat exposure and hypohydration induced similar physiological strain during loaded exercise; when combined, heat exposure with hypohydration, synergistically exacerbated physiological strain and mood disturbance.

UI MeSH Term Description Entries
D008297 Male Males
D003681 Dehydration The condition that results from excessive loss of water from a living organism. Water Stress,Stress, Water
D005080 Exercise Test Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used. Arm Ergometry Test,Bicycle Ergometry Test,Cardiopulmonary Exercise Testing,Exercise Testing,Step Test,Stress Test,Treadmill Test,Cardiopulmonary Exercise Test,EuroFit Tests,Eurofit Test Battery,European Fitness Testing Battery,Fitness Testing,Physical Fitness Testing,Arm Ergometry Tests,Bicycle Ergometry Tests,Cardiopulmonary Exercise Tests,Ergometry Test, Arm,Ergometry Test, Bicycle,Ergometry Tests, Arm,Ergometry Tests, Bicycle,EuroFit Test,Eurofit Test Batteries,Exercise Test, Cardiopulmonary,Exercise Testing, Cardiopulmonary,Exercise Tests,Exercise Tests, Cardiopulmonary,Fitness Testing, Physical,Fitness Testings,Step Tests,Stress Tests,Test Battery, Eurofit,Test, Arm Ergometry,Test, Bicycle Ergometry,Test, Cardiopulmonary Exercise,Test, EuroFit,Test, Exercise,Test, Step,Test, Stress,Test, Treadmill,Testing, Cardiopulmonary Exercise,Testing, Exercise,Testing, Fitness,Testing, Physical Fitness,Tests, Arm Ergometry,Tests, Bicycle Ergometry,Tests, Cardiopulmonary Exercise,Tests, EuroFit,Tests, Exercise,Tests, Step,Tests, Stress,Tests, Treadmill,Treadmill Tests
D006339 Heart Rate The number of times the HEART VENTRICLES contract per unit of time, usually per minute. Cardiac Rate,Chronotropism, Cardiac,Heart Rate Control,Heartbeat,Pulse Rate,Cardiac Chronotropy,Cardiac Chronotropism,Cardiac Rates,Chronotropy, Cardiac,Control, Heart Rate,Heart Rates,Heartbeats,Pulse Rates,Rate Control, Heart,Rate, Cardiac,Rate, Heart,Rate, Pulse
D006358 Hot Temperature Presence of warmth or heat or a temperature notably higher than an accustomed norm. Heat,Hot Temperatures,Temperature, Hot,Temperatures, Hot
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000293 Adolescent A person 13 to 18 years of age. Adolescence,Youth,Adolescents,Adolescents, Female,Adolescents, Male,Teenagers,Teens,Adolescent, Female,Adolescent, Male,Female Adolescent,Female Adolescents,Male Adolescent,Male Adolescents,Teen,Teenager,Youths
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000339 Affect The feeling-tone accompaniment of an idea or mental representation. It is the most direct psychic derivative of instinct and the psychic representative of the various bodily changes by means of which instincts manifest themselves. Mood,Affects,Moods
D015444 Exercise Physical activity which is usually regular and done with the intention of improving or maintaining PHYSICAL FITNESS or HEALTH. Contrast with PHYSICAL EXERTION which is concerned largely with the physiologic and metabolic response to energy expenditure. Aerobic Exercise,Exercise, Aerobic,Exercise, Isometric,Exercise, Physical,Isometric Exercise,Physical Activity,Acute Exercise,Exercise Training,Activities, Physical,Activity, Physical,Acute Exercises,Aerobic Exercises,Exercise Trainings,Exercise, Acute,Exercises,Exercises, Acute,Exercises, Aerobic,Exercises, Isometric,Exercises, Physical,Isometric Exercises,Physical Activities,Physical Exercise,Physical Exercises,Training, Exercise,Trainings, Exercise

Related Publications

Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Physiological strain due to load carrying.
January 1990, European journal of applied physiology and occupational physiology,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Physiological strain due to load carrying in heavy footwear.
January 1992, European journal of applied physiology and occupational physiology,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Climate and physiological heat strain during exercise.
October 1989, International journal of biometeorology,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Perceptual versus physiological heat strain during exercise-heat stress.
September 2002, Medicine and science in sports and exercise,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Physiological responses and warm discomfort during heat strain.
January 1973, Archives des sciences physiologiques,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Effects of pyridostigmine bromide on physiological responses to heat, exercise, and hypohydration.
January 1992, Aviation, space, and environmental medicine,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Effects of aerobic fitness on hypohydration-induced physiological strain and exercise impairment.
February 2010, Acta physiologica (Oxford, England),
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Burn Injury Does Not Exacerbate Heat Strain during Exercise while Wearing Body Armor.
October 2020, Medicine and science in sports and exercise,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Hypohydration and heat acclimation: plasma renin and aldosterone during exercise.
December 1983, Journal of applied physiology: respiratory, environmental and exercise physiology,
Elizabeth L Adams, and Douglas J Casa, and Robert A Huggins, and Julie K DeMartini-Nolan, and Rebecca L Stearns, and Rachel M Kennedy, and Megan M Bosworth, and Lindsay J DiStefano, and Lawrence E Armstrong, and Carl M Maresh
Aging and assessment of physiological strain during exercise-heat stress.
April 2002, American journal of physiology. Regulatory, integrative and comparative physiology,
Copied contents to your clipboard!