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Thermoregulation and stress hormone recovery after exercise dehydration: comparison of rehydration methods.

Abstract：

CONTEXT:Athletic trainers recommend and use a multitude of rehydration (REHY) methods with their patients. The REHY modality that most effectively facilitates recovery is unknown. OBJECTIVE:To compare 5 common REHY methods for thermoregulatory and stress hormone recovery after exercise dehydration (EXDE) in trained participants. DESIGN:Randomized, cross-over, controlled study. PATIENTS OR OTHER PARTICIPANTS:Twelve physically active, non-heat-acclimatized men (age = 23 ± 4 years, height = 180 ± 6 cm, mass = 81.3 ± 3.7 kg, VO2max = 56.9 ± 4.4 mL·min(-1)·kg(-1), body fat = 7.9% ± 3%) participated. INTERVENTION(S):Participants completed 20-hour fluid restriction and 2-hour EXDE; they then received no fluid (NF) or REHY (half-normal saline) via ad libitum (AL), oral (OR), intravenous (IV), or combination IV and OR (IV + OR) routes for 30 minutes; and then were observed for another 30 minutes. MAIN OUTCOME MEASURE(S):Body mass, rectal temperature, 4-site mean weighted skin temperature, plasma stress hormone concentrations, and environmental symptoms questionnaire (ESQ) score. RESULTS:Participants were hypohydrated (body mass -4.23% ± 0.22%) post-EXDE. Rectal temperature for the NF group was significantly greater than for the IV group (P = .023) at 30 minutes after beginning REHY (REHY30) and greater than OR, IV, and IV + OR (P ≤ .009) but not AL (P = .068) at REHY60. Mean weighted skin temperature during AL was less than during IV + OR at REHY5 (P = .019). The AL participants demonstrated increased plasma cortisol concentrations compared with IV + OR, independent of time (P = .015). No differences existed between catecholamine concentrations across treatments (P > .05). The ESQ score was increased at REHY60 for NF, AL, OR, and IV (P < .05) but not for IV + OR (P = .217). The NF ESQ score was greater than that of IV + OR at REHY60 (P = .012). CONCLUSIONS:Combination IV + OR REHY reduced body temperature to a greater degree than OR and AL REHY when compared with NF. Future studies addressing clinical implications are needed.

journal_name

J Athl Train

journal_title

Journal of athletic training

authors

McDermott BP,Casa DJ,Lee E,Yamamoto L,Beasley K,Emmanuel H,Anderson J,Pescatello L,Armstrong LE,Maresh C

doi

10.4085/1062-6050-48.6.01

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

725-33

issue

eissn

1062-6050

issn

1938-162X

journal_volume

pub_type

杂志文章,随机对照试验

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Thermoregulation and stress hormone recovery after exercise dehydration: comparison of rehydration methods.