Abstract:
PURPOSE:Dietary nitrate (NO3 (-)) supplementation reduces the O2 cost of fixed-workload tasks performed in temperate environments but has not been examined in the heat. If this effect were retained it could reduce heatstroke risk in military personnel that are deployed for desert combat. METHODS:Nine men completed three 45 min loaded battle marches at a standard cadence (4.83 km h(-1)/1.5 % grade) while wearing full combat gear [BDU, boots, body armor (8 kg), NBC suit] and carrying a loaded rucksack (16 kg). The 1st March (FAM) commenced in a temperate environment. The 2nd and 3rd commenced in simulated dry desert conditions (41 °C/20 % RH) and required subjects to ingest the beetroot juice equivalent of 8.4 mmol NO3 (-) (BRJ) or a NO3 (-) depleted placebo (PLA) for 6 days prior. VO2, VCO2, V E, core (T re), skin (T sk), and mean body (T b) temperatures, HR, and physiological strain index (PSI) were measured continuously. Thermal sensation, generalized discomfort, and perceived exertion (RPE) were measured at 5 min intervals. Heat storage (HS) was calculated. Blood markers of gastrointestinal permeability (TNF, Il-6, HO-1) were measured before and after exercise. RESULTS:VO2 in BRJ was lower than PLA from 1 to 12; 16 to 26; and 29 to 45 min of exercise (p < 0.05). VCO2 in BRJ was lower than PLA from 1 to 12 min (p < 0.05). V E in BRJ was lower than PLA from 1 to 20 min of exercise (p < 0.05). T re and T b in BRJ exceeded PLA from 16 to 45 min (p < 0.05). TNF, Il-6, and HO-1 were reduced in BRJ (p < 0.05) while HR, PSI, Tsk, and HS were not altered (p > 0.05). Thermal sensation, generalized discomfort, and RPE were elevated in BRJ from 40 to 45, 25 to 45, and 10 to 45 min, respectively (p < 0.01). CONCLUSION:Metabolic efficiency was improved in BRJ. Paradoxically, body temperatures rose more. This was not due to gut permeability. Therefore, we speculate that based on elimination of other possibilities, blood redistribution from skin to skeletal muscle may have contributed to impaired heat exchange.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Kuennen M,Jansen L,Gillum T,Granados J,Castillo W,Nabiyar A,Christmas Kdoi
10.1007/s00421-015-3255-0subject
Has Abstractpub_date
2015-12-01 00:00:00pages
2557-69issue
12eissn
1439-6319issn
1439-6327pii
10.1007/s00421-015-3255-0journal_volume
115pub_type
杂志文章abstract::Randomized controlled trials (RCTs) on the topic of physical training and blood coagulation are rare and the effects are unclear. The aim of this study was to investigate whether endurance training adjusts blood coagulation and fibrinolysis at rest and after exercise. The study included 50 healthy untrained non-smoker...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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更新日期:2018-05-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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abstract::The aim of this study was to determine the timecourse of recovery of immunoendocrine responses following prolonged cycling. With the approval of the Ethics Committee, ten healthy men (age 21.6+/-0.9 years, height 1.77+/-0.01 m, body mass 66.9+/-1.8 kg, VO2max 54.2+/-2.0 ml kg(-1) min(-1); means+/-SEM) performed either...
journal_title:European journal of applied physiology
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journal_title:European journal of applied physiology
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journal_title:European journal of applied physiology
pub_type: 杂志文章
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更新日期:2006-03-01 00:00:00
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pub_type: 杂志文章
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journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-012-2383-z
更新日期:2012-12-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
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journal_title:European journal of applied physiology
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更新日期:2020-02-01 00:00:00
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journal_title:European journal of applied physiology
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journal_title:European journal of applied physiology
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pub_type: 杂志文章
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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更新日期:2016-10-01 00:00:00
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journal_title:European journal of applied physiology
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更新日期:2018-11-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-016-3468-x
更新日期:2016-12-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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更新日期:2011-08-01 00:00:00
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journal_title:European journal of applied physiology
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journal_title:European journal of applied physiology
pub_type: 杂志文章
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
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更新日期:2017-06-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章
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更新日期:2001-08-01 00:00:00
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journal_title:European journal of applied physiology
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更新日期:2014-04-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章
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更新日期:2020-03-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-010-1576-6
更新日期:2010-12-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-017-3711-0
更新日期:2017-11-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章
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更新日期:2008-09-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210100460
更新日期:2001-08-01 00:00:00
abstract::This study contrasted the effects of load characteristics on coordinative strategies between postural holding and position tracking. Fifteen healthy adults conducted postural holding and sinusoidal tracking with the index finger while manipulated loads (0, 50, and 100 g) were superimposed on an outstretched arm. Oscil...
journal_title:European journal of applied physiology
pub_type: 杂志文章
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更新日期:2009-04-01 00:00:00
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journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2003-08-01 00:00:00