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https://www.readbyqxmd.com/read/29346162/specificity-of-live-high-train-low-altitude-training-on-exercise-performance
#1
Jacob Bejder, Nikolai Baastrup Nordsborg
The novel hypothesis that "Live High-Train Low" (LHTL) does not improve sport-specific exercise performance (e.g., time trial) is discussed. Indeed, many studies demonstrate improved performance after LHTL but unfortunately control groups are often lacking, leaving open the possibility of training camp effects. Importantly, when control groups, blinding procedures and strict scientific evaluation criteria are applied, LHTL has no detectable effect on performance.
January 15, 2018: Exercise and Sport Sciences Reviews
https://www.readbyqxmd.com/read/29342191/changes-in-balance-and-joint-position-sense-during-a-12-day-high-altitude-trek-the-british-services-dhaulagiri-medical-research-expedition
#2
Sarah B Clarke, Kevin Deighton, Caroline Newman, Gareth Nicholson, Liam Gallagher, Christopher J Boos, Adrian Mellor, David R Woods, John P O'Hara
Postural control and joint position sense are essential for safely undertaking leisure and professional activities, particularly at high altitude. We tested whether exposure to a 12-day trek with a gradual ascent to high altitude impairs postural control and joint position sense. This was a repeated measures observational study of 12 military service personnel (28±4 years). Postural control (sway velocity measured by a portable force platform) during standing balance, a Sharpened Romberg Test and knee joint position sense were measured, in England (113m elevation) and at 3 research camps (3619m, 4600m and 5140m) on a 12-day high altitude trek in the Dhaulagiri region of Nepal...
2018: PloS One
https://www.readbyqxmd.com/read/29247024/is-live-high-train-low-altitude-training-relevant-for-elite-athletes-flawed-analysis-from-inaccurate-data
#3
EDITORIAL
Gregoire P Millet, Robert F Chapman, Olivier Girard, Franck Brocherie
No abstract text is available yet for this article.
December 15, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29202898/isolated-psychosis-during-exposure-to-very-high-and-extreme-altitude-characterisation-of-a-new-medical-entity
#4
Katharina Hüfner, Hermann Brugger, Eva Kuster, Franziska Dünsser, Agnieszka E Stawinoga, Rachel Turner, Iztok Tomazin, Barbara Sperner-Unterweger
BACKGROUND: Psychotic episodes during exposure to very high or extreme altitude have been frequently reported in mountain literature, but not systematically analysed and acknowledged as a distinct clinical entity. METHODS: Episodes reported above 3500 m altitude with possible psychosis were collected from the lay literature and provide the basis for this observational study. Dimensional criteria of the Diagnostic and Statistical Manual of Mental Disorders were used for psychosis, and the Lake Louise Scoring criteria for acute mountain sickness and high-altitude cerebral oedema (HACE)...
December 5, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/29189929/correction-to-the-effect-of-natural-or-simulated-altitude-training-on-high-intensity-intermittent-running-performance-in-team-sport-athletes-a-meta-analysis
#5
Michael J Hamlin, Catherine A Lizamore, Will G Hopkins
Page 10, Fig. 2: The filled circle labelled "3" was plotted inaccurately and should have been in the "harmful" section of the graph, as shown in the corrected version below.
November 30, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29183280/using-a-monitoring-and-evaluation-framework-to-improve-study-efficiency-and-quality-during-a-prospective-cohort-study-in-infants-receiving-rotavirus-vaccination-in-el-alto-bolivia-the-infant-nutrition-inflammation-and-diarrheal-illness-nidi-study
#6
Anna M Aceituno, Kaitlyn K Stanhope, Paulina A Rebolledo, Rachel M Burke, Rita Revollo, Volga Iñiguez, Parminder S Suchdev, Juan S Leon
BACKGROUND: Implementing rigorous epidemiologic studies in low-resource settings involves challenges in participant recruitment and follow-up (e.g., mobile populations, distrust), biological sample collection (e.g., cold-chain, laboratory equipment scarcity) and data collection (e.g., literacy, staff training, and infrastructure). This article describes the use of a monitoring and evaluation (M&E) framework to improve study efficiency and quality during participant engagement, and biological sample and data collection in a longitudinal cohort study of Bolivian infants...
November 28, 2017: BMC Public Health
https://www.readbyqxmd.com/read/29161094/the-effect-of-resistance-training-in-a-hypoxic-chamber-on-physical-performance-in-elite-rugby-athletes
#7
Brad Mayo, Cory Miles, Stacy Sims, Matthew Driller
Mayo, Brad, Cory Miles, Stacy Sims, and Matthew Driller. The effect of resistance training in a hypoxic chamber on physical performance in elite rugby athletes. High Alt Med Biol 00:000-000, 2017.-Limited research suggests that muscle adaptations may be enhanced through resistance training in a hypoxic environment. Seventeen professional rugby union athletes (age [mean ± SD], 24 ± 3 years; body mass, 98.7 ± 12.8 kg; and height, 188.9 ± 7.9 cm), performed 12 resistance training sessions over a 3-week period...
November 21, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29143667/validation-of-whole-blood-transcriptome-signature-during-microdose-recombinant-human-erythropoietin-rhuepo-administration
#8
Guan Wang, Jérôme Durussel, Jonathan Shurlock, Martin Mooses, Noriyuki Fuku, Georgie Bruinvels, Charles Pedlar, Richard Burden, Andrew Murray, Brendan Yee, Anne Keenan, John D McClure, Pierre-Edouard Sottas, Yannis P Pitsiladis
BACKGROUND: Recombinant human erythropoietin (rHuEpo) can improve human performance and is therefore frequently abused by athletes. As a result, the World Anti-Doping Agency (WADA) introduced the Athlete Biological Passport (ABP) as an indirect method to detect blood doping. Despite this progress, challenges remain to detect blood manipulations such as the use of microdoses of rHuEpo. METHODS: Forty-five whole-blood transcriptional markers of rHuEpo previously derived from a high-dose rHuEpo administration trial were used to assess whether microdoses of rHuEpo could be detected in 14 trained subjects and whether these markers may be confounded by exercise (n = 14 trained subjects) and altitude training (n = 21 elite runners and n = 4 elite rowers, respectively)...
November 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29129021/the-effect-of-natural-or-simulated-altitude-training-on-high-intensity-intermittent-running-performance-in-team-sport-athletes-a-meta-analysis
#9
REVIEW
Michael J Hamlin, Catherine A Lizamore, Will G Hopkins
BACKGROUND: While adaptation to hypoxia at natural or simulated altitude has long been used with endurance athletes, it has only recently gained popularity for team-sport athletes. OBJECTIVE: To analyse the effect of hypoxic interventions on high-intensity intermittent running performance in team-sport athletes. METHODS: A systematic literature search of five journal databases was performed. Percent change in performance (distance covered) in the Yo-Yo intermittent recovery test (level 1 and level 2 were used without differentiation) in hypoxic (natural or simulated altitude) and control (sea level or normoxic placebo) groups was meta-analyzed with a mixed model...
November 11, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29112625/ischemic-preconditioning-improves-time-trial-performance-at-moderate-altitude
#10
Pénélope Paradis-Deschênes, Denis R Joanisse, François Billaut
PURPOSE: Endurance athletes often compete and train at altitude where exercise capacity is reduced. Investigating acclimation strategies is therefore critical. Ischemic preconditioning (IPC) can improve endurance performance at sea level through improved O2 delivery and utilization, which could also prove beneficial at altitude. However, data are scarce and there is no study at altitudes commonly visited by endurance athletes. METHODS: In a randomized, crossover study, we investigated performance and physiological responses in thirteen male endurance cyclists during four 5-km cycling time trials (TT), preceded by either IPC (3x5-minutes ischemia/5-minutes reperfusion cycles at 220 mmHg) or SHAM (20 mmHg) administered to both thighs, at simulated low (FIO2 0...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29111287/transcatheter-closure-of-a-small-atrial-septal-defect-with-an-amplatzer%C3%A2-patent-foramen-ovale-occluder-in-a-working-dog-with-cyanosis-and-exercise-intolerance-at-high-altitude
#11
A Shelden, S Wesselowski, S G Gordon, A B Saunders
A 6.5-year-old male Border Collie presented for transcatheter closure of an atrial septal defect due to exercise intolerance and cyanosis while working and training at altitude. A small, left-to-right shunting secundum atrial septal defect was confirmed with no evidence of significant right-sided volume overload. Pulmonary hypertension with subsequent right-to-left interatrial shunting occurring during exercise at high altitude was suspected and prompted the closure of the defect due to the dog's continued athletic requirements...
December 2017: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/29098323/three-question-set-from-michigan-neuropathy-screening-instrument-adds-independent-prognostic-information-on-cardiovascular-outcomes-analysis-of-altitude-trial
#12
Jelena P Seferovic, Marc A Pfeffer, Brian Claggett, Akshay S Desai, Dick de Zeeuw, Steven M Haffner, John J V McMurray, Hans-Henrik Parving, Scott D Solomon, Nish Chaturvedi
AIMS/HYPOTHESIS: The self-administered Michigan Neuropathy Screening Instrument (MNSI) is used to diagnose diabetic peripheral neuropathy. We examined whether the MNSI might also provide information on risk of death and cardiovascular outcomes. METHODS: In this post hoc analysis of the Aliskiren Trial in Type 2 Diabetes Using Cardio-Renal Endpoints (ALTITUDE) trial, we divided 8463 participants with type 2 diabetes and chronic kidney disease (CKD) and/or cardiovascular disease (CVD) into independent training (n = 3252) and validation (n = 5211) sets...
November 3, 2017: Diabetologia
https://www.readbyqxmd.com/read/29064292/psychophysiological-response-and-fine-motor-skills-in-high-altitude-parachute-jumps
#13
Vicente Javier Clemente-Suárez, José Juan Robles-Pérez, Ketty Herrera-Mendoza, Beliña Herrera-Tapias, Jesús Fernández-Lucas
Clemente-Suárez, Vicente Javier, José Juan Robles-Pérez, Ketty Herrera-Mendoza, Beliña Herrera-Tapias, and Jesús Fernández-Lucas. Psychophysiological response and fine motor skills in high-altitude parachute jumps. High Alt Med Biol 00:000-000, 2017.-We analyzed the psychophysiological response and specific fine motor skill of an experienced jumper in HALO (high altitude low opening) and HAHO (high altitude high opening) parachute jumps. Eight HALO and eight HAHO jumpers were analyzed. They jumped at 5500 m, HALO jumpers opened the parachute at 500 m and HAHO jumpers at 4300 m of altitude...
October 24, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29029300/flight-activity-and-field-infestation-relationships-for-coffee-berry-borer-in-commercial-coffee-plantations-in-kona-and-kau-districts-hawaii
#14
Luis F Aristizábal, Suzanne Shriner, Robert Hollingsworth, Steven Arthurs
The coffee berry borer (CBB), Hypothenemus hampei Ferrari (Coleoptera: Curculionidae: Scolytinae) is a recent invader to Hawaii. To date, limited information regarding the seasonal phenology of this pest on the islands limits the implementation of integrated control strategies. As part of a coffee farmer training program, we monitored CBB flight activity in 15 coffee plantations (Kona and Kau Districts) over 10 mo with methanol-ethanol (3:1 ratio) baited traps. Concurrently, we quantified CBB infestation and penetration rates inside developing coffee berries through the end of harvest...
September 27, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29024137/do-male-athletes-with-already-high-initial-hemoglobin-mass-benefit-from-live-high-train-low-altitude-training
#15
Anna Hauser, Severin Troesch, Thomas Steiner, Franck Brocherie, Olivier Girard, Jonas J Saugy, Laurent Schmitt, Grégoire P Millet, Jon P Wehrlin
It has been proposed that athletes with high initial values of hemoglobin mass (Hbmass ) will have a lower Hbmass increase in response to 'live high-train low' (LHTL) altitude training. To verify this assumption, the relationship between initial absolute and relative Hbmass values and their respective Hbmass increase following LHTL in male endurance and team-sport athletes was investigated. Overall, 58 male athletes (35 well-trained endurance athletes and 23 elite male field hockey players) undertook an LHTL training camp with similar hypoxic doses (200-230 h)...
October 11, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29023329/living-and-training-at-825m-for-8-weeks-supplemented-with-intermittent-hypoxic-training-at-3000m-improves-blood-parameters-and-running-performance
#16
Preetiwat Wonnabussapawich, Michael J Hamlin, Catherine A Lizamore, Nuttaset Manimmanakorn, Naruemon Leelayuwat, Orathai Tunkamnerdthai, Worrawut Thuwakum, Apiwan Manimmanakorn
We aimed to investigate the effect of an 8-week low-altitude training block supplemented with intermittent hypoxic training, on blood and performance parameters in soccer players. Forty university-level male soccer players were separated into altitude (n = 20, 825m) or sea level (n = 20, 125m) groups. Before (1-2 days prior) and after (1 and 14 days post) training, players were asked to give a resting venous blood sample and complete a series of performance tests. Compared to sea level, the altitude group increased erythropoietin, red cell count and hematocrit 1 day post training (42...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28956166/acute-and-chronic-changes-in-baroreflex-sensitivity-in-hypobaric-vs-normobaric-hypoxia
#17
Nicolas Bourdillon, Jonas Saugy, Laurent Schmitt, Thomas Rupp, Sasan Yazdani, Jean-Marc Vesin, Grégoire P Millet
Normobaric hypoxia (NH) is used as a surrogate for hypobaric hypoxia (HH). Recent studies reported physiological differences between NH and HH. Baroreflex sensitivity (BRS) decreases at altitude or following intense training. However, until now no study compared the acute and chronic changes of BRS in NH vs. HH. First, BRS was assessed in 13 healthy male subjects prior and after 20 h of exposure at 3450 m (study 1), and second in 15 well-trained athletes prior and after 18 days of "live-high train-low" (LHTL) at 2250 m (study 2) in NH vs...
December 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28949829/performance-mood-and-anxiety-during-a-climb-of-mount-everest
#18
Heikki M Karinen, Martti T Tuomisto
Karinen, Heikki M., and Martti T. Tuomisto. Performance, mood, and anxiety during a climb of Mount Everest. High Alt Med Biol. 16:000-000, 2017. BACKGROUND: Various studies have shown the deleterious effects of high-altitude hypoxia on visual, motor, somatosensory, cognitive, and emotional function and also in intelligence tests, reaction time, speech comprehension, hand steadiness, visual contrast discrimination, and word association tests. Because optimal cognitive abilities may be crucial for mountain climbers' safety, this study was intended to evaluate the changes in cognitive performance, mood, and anxiety during an Everest expedition lasting almost 3 months...
September 26, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28929623/influence-of-combined-iron-supplementation-and-simulated-hypoxia-on-the-haematological-module-of-the-athlete-biological-passport
#19
Laura A Garvican-Lewis, Victor L Vuong, Andrew D Govus, Yorck Olaf Schumacher, David Hughes, Greg Lovell, Daniel Eichner, Christopher J Gore
The integrity of Athlete Biological Passport (ABP) is underpinned by understanding normal fluctuations of its biomarkers to environmental or medical conditions, e.g. altitude training or iron deficiency. The combined impact of altitude and iron supplementation on the ABP was evaluated in endurance-trained athletes (n=34) undertaking 3-weeks of simulated live-high: train-low (14 h.d(-1) , 3000m). Athletes received either oral, intravenous (IV) or placebo iron supplementation, commencing two weeks prior and continuing throughout hypoxic exposure...
September 19, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28859408/fuel-use-in-mammals-conserved-patterns-and-evolved-strategies-for-aerobic-locomotion-and-thermogenesis
#20
Grant B McClelland, Sulayman A Lyons, Cayleih E Robertson
Effective aerobic locomotion depends on adequate delivery of oxygen and an appropriate allocation of metabolic substrates. The use of metabolic substrates during exercise follows a predictive pattern of lipid and carbohydrate oxidation that is similar in lowland native cursorial mammals. We have found that in two highland lineages of mice (Phyllotis and Peromyscus) the fuel use pattern is shifted to a greater reliance on carbohydrates compared to their lowland conspecifics and congenerics. However, there is variation between lineages in the importance of phenotypic plasticity in the expression of this metabolic phenotype...
August 1, 2017: Integrative and Comparative Biology
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