NDLI: Physiological and performance responses to a training camp in the heat in professional Australian football players.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Racinais, Sebastien Buchheit, Martin Bilsborough, Johann Bourdon, Pitre C. Cordy, Justin Coutts, Aaron J.
Spatial Coverage	Australia
Description	Country affiliation: Qatar Author Affiliation: Racinais S ( Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Research and Education Center, Doha, Qatar.)
Abstract	PURPOSE: To examine the physiological and performance responses to a heat-acclimatization camp in highly trained professional team-sport athletes. METHODS: Eighteen male Australian Rules Football players trained for 2 wk in hot ambient conditions (31-33°C, humidity 34-50%). Players performed a laboratory-based heat-response test (24-min walk + 24 min seated; 44°C), a YoYo Intermittent Recovery Level 2 Test (YoYoIR2; indoor, temperate environment, 23°C) and standardized training drills (STD; outdoor, hot environment, 32°C) at the beginning and end of the camp. RESULTS: The heat-response test showed partial heat acclimatization (eg, a decrease in skin temperature, heart rate, and sweat sodium concentration, P < .05). In addition, plasma volume (PV, CO rebreathing, +2.68 [0.83; 4.53] mL/kg) and distance covered during both the YoYoIR2 (+311 [260; 361] m) and the STD (+45.6 [13.9; 77.4] m) increased postcamp (P < .01). None of the performance changes showed clear correlations with PV changes (r < .24), but the improvements in running STD distance in hot environment were correlated with changes in hematocrit during the heat-response test (r = -.52, 90%CI [-.77; -.12]). There was no clear correlation between the performance improvements in temperate and hot ambient conditions (r < .26). CONCLUSION: Running performance in both hot and temperate environments was improved after a football training camp in hot ambient conditions that stimulated heat acclimatization. However, physiological and performance responses were highly individual, and the absence of correlations between physical-performance improvements in hot and temperate environments suggests that their physiological basis might differ.
File Format	HTM / HTML
ISSN	15550265
Issue Number	4
Volume Number	9
e-ISSN	15550273
Journal	International Journal of Sports Physiology and Performance
Language	English
Publisher	Human Kinetics
Publisher Date	2014-07-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Physiology Discipline Sports Medicine Acclimatization Hot Temperature Physical Conditioning, Human Methods Sports Australia Exercise Test Heart Rate Humans Humidity Male Motor Skills Physical Endurance Plasma Volume Respiration Running Skin Temperature Sodium Metabolism Sweat Sweating Task Performance And Analysis Time Factors Young Adult Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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