high altitud and training

Trent Stellingwerff, Peter Peeling, Laura A Garvican-Lewis, Rebecca Hall, Anu E Koivisto, Ida A Heikura, Louise M Burke
Training at low to moderate altitudes (~ 1600-2400 m) is a common approach used by endurance athletes to provide a distinctive environmental stressor to augment training stimulus in the anticipation of increasing subsequent altitude- and sea-level-based performance. Despite some scientific progress being made on the impact of various nutrition-related changes in physiology and associated interventions at mountaineering altitudes (> 3000 m), the impact of nutrition and/or supplements on further optimization of these hypoxic adaptations at low-moderate altitudes is only an emerging topic...
November 6, 2019: Sports Medicine
Atef M Ghaleb, Mohamed Z Ramadan, Ahmed Badwelan, Khalid Saad Aljaloud
OBJECTIVE: The purpose of this study was to evaluate the lifting capabilities of individuals in hypoxia when they wear different types of safety shoes and to investigate the behavior of the physiological responses induced by the lifting process associated with those variables. METHODS: An experimental design was used, based on two sessions. The first was training and acclimatization session, then an experimental lifting phase. A total of ten male students of King Saud University were recruited in the study...
October 29, 2019: International Journal of Environmental Research and Public Health
Hui Yuan, Yong Wang, Peng-Fei Liu, Yun-Long Yue, Jin-Song Guo, Zhen-Chang Wang
BACKGROUND: Hypobaric hypoxia (HH) exposure at high altitudes can result in a decline in cognitive function, which may have a serious impact on the daily life of people who migrate to high altitudes. However, the specific HH-induced changes in brain function remain unclear. This study explored changes in brain activity in rats exposed to a sustained HH environment using functional magnetic resonance imaging (fMRI). METHODS: Healthy male rats (8 weeks old) were randomly divided into a model group and a control group...
October 22, 2019: Chinese Medical Journal
Bipul Neupane, Teerayut Horanont, Nguyen Duy Hung
The production of banana-one of the highly consumed fruits-is highly affected due to loss of certain number of banana plants in an early phase of vegetation. This affects the ability of farmers to forecast and estimate the production of banana. In this paper, we propose a deep learning (DL) based method to precisely detect and count banana plants on a farm exclusive of other plants, using high resolution RGB aerial images collected from Unmanned Aerial Vehicle (UAV). An attempt to detect the plants on the normal RGB images resulted less than 78...
2019: PloS One
Xin Dong, Yuan-Meng-Ran Chu, Xiaodong Gu, Qiongyu Huang, Jindong Zhang, Wenke Bai
As an endemic primate species with one of the highest priorities in wildlife conservation in China, Sichuan snub-nosed monkeys (Rhinopithecus roxellana) have undergone a sharp decline and range reduction in recent centuries. Here, we used maximum entropy modelling (MaxEnt) integrated with four types of environmental variables, including three biological climate variables (Bio17, precipitation of the driest quarter; Bio6, min. temperature of the coldest month; and Bio2, mean diurnal range), three topographic variables (altitude, slope, and aspect), two anthropogenic variables (Human Footprint Index and human disturbance), and three vegetation-related variables (enhanced vegetation index, normalized difference vegetation index, and Wet Index) to identify the spatial distribution of suitable habitats for Sichuan snub-nosed monkeys in Baihe Nature Reserve (BNR), which is located in the Minshan Mountains...
October 11, 2019: Environmental Science and Pollution Research International
Linjia Wang, Simin Yang, Lu Yan, Hao Wei, Jianxiong Wang, Siwang Yu, Ah-Ng Tony Kong, Ying Zhang
Elite endurance athletes are used to train under hypoxic/high altitude conditions, which can elicit certain stress responses in skeletal muscle and helps to improve their physical performance. Nuclear factor erythroid 2-related factor 2 (Nrf2) regulates the cellular redox homoeostasis and metabolism in skeletal muscle, playing important roles in adaptation to various stresses. In this study, Nrf2 knockout (KO) and wild-type (WT) mice were pre-conditioned to 48 hours of hypoxia exposure (11.2% oxygen), and the effects of hypoxia preconditioning (HP) on exercise capacity and exercise-induced changes of antioxidant status, energetic metabolism and mitochondrial adaptation in skeletal muscle were evaluated...
September 5, 2019: Journal of Applied Physiology
Jessica U Meir, Julia M York, Bev A Chua, Wilhelmina Jardine, Lucy A Hawkes, William K Milsom
The bar-headed goose is famed for migratory flight at extreme altitude. To better understand the physiology underlying this remarkable behavior, we imprinted and trained geese, collecting the first cardiorespiratory measurements of bar-headed geese flying at simulated altitude in a wind tunnel. Metabolic rate during flight increased 16-fold from rest, supported by an increase in the estimated amount of O2 transported per heartbeat and a modest increase in heart rate. The geese appear to have ample cardiac reserves, as heart rate during hypoxic flights was not higher than in normoxic flights...
September 3, 2019: ELife
Behnam Meshgi, Morteza Majidi-Rad, Ahmad Ali Hanafi-Bojd, Ali Kazemzadeh
Dicrocoeliasisis caused by the small liver fluke (Dicrocoelium spp.), mainly Dicrocoelium dendriticum in domestic and wild ruminants. The small liver fluke is the probable predisposing cause of economic burden. The impact of geographic and climatic factors on the incidence of dicrocoeliasis has been severely ignored in different geographical areas. Due to the lack of data regarding dicrocoeliasis in Iran, this study was aimed to investigate the prevalence and intensity of ovine and bovine Dicrocoelium infection in the coastal strip south of the Caspian Sea...
July 12, 2019: Preventive Veterinary Medicine
Tao Shen, Hong Yu, Yuan Zhong Wang
Based on the species distribution data provided by the National Specimen Information Infrastructure combined with field survey and MaxEnt model, we simulated and verified the suitable distribution area of Gentiana rigescens. Furthermore, the relationship between the geographical distribution and climatic factors of G. rigescens was analyzed. The results showed that area under curve of training set and test set were more than 0.90, indicating high prediction precision and accurate prediction results. Geographic coordinate range of G...
July 2019: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Melissa L Coleman
The space race began in the summer of 1955 when the United States and the Soviet Union pledged to launch artificial satellites. The race culminated in 1969 when the United States landed the first humans on the moon. After completing his training in anesthesiology, Dr. Cloid Green forged his career as one of the physician-scientists who played an integral role by evaluating the effects of space flight on human physiology. Family members of Dr. Green were interviewed and university and society archives, literature and periodicals were reviewed...
April 2019: Journal of Anesthesia History
Luca Ruggiero, Ryan L Hoiland, Alexander B Hansen, Philip N Ainslie, Chris J McNeil
PURPOSE: We investigated the effect of high-altitude acclimatization on peripheral fatigue compared to sea level and acute hypoxia. METHODS: At sea level (350 m), acute hypoxia (environmental chamber), and chronic hypoxia (5050 m, 5-9 days) (partial pressure of inspired oxygen = 140, 74 and 76 mmHg, respectively), 12 participants (11 in chronic hypoxia) had the quadriceps of their dominant leg fatigued by 3 bouts of 75 intermittent electrically-evoked contractions (12 pulses at 15 Hz, 1...
July 19, 2019: Medicine and Science in Sports and Exercise
Mehdi Yadegari, Maha Sellami, Simin Riahy, Shadmehr Mirdar, Gholamreza Hamidian, Ayoub Saeidi, Abderraouf Ben Abderrahman, Anthony C Hackney, Hassane Zouhal
Background and Objectives: Several studies have reported that some conditions such as exercise and hypoxia induce DNA damage and dysfunction and apoptosis. Some plant foods contain numerous bioactive compounds and anti-inflammatory properties that can help fight DNA damage. Therefore, the current study evaluated the effect of supplementation of Adiantum capillus-veneris (ACV) extract on Bax/B-cell lymphoma 2 (Bcl-2) ratio apoptotic index and remodeling of pulmonary alveolar epithelial cells in lung tissue of healthy Wistar rats during stressful conditions (hypoxia)...
July 23, 2019: Medicina
Cécile H Kicken, Lisa N van der Vorm, Suzanne Zwaveling, Evi Schoenmaker, Jasper A Remijn, Dana Huskens, Bas de Laat
Introduction  Although physical exercise is protective against cardiovascular disease, it can also provoke sudden cardiac death (exercise paradox). Epidemiological studies suggest that systemic hypoxia at high altitude is a risk factor for venous thromboembolism. Forthcoming, this study investigated the effect of repeated exercise at high altitude on blood coagulation, platelet function, and fibrinolysis. Methods  Six trained male volunteers were recruited. Participants ascended from sea level to 3,375 m altitude...
July 2019: TH open: companion journal to thrombosis and haemostasis
Patrick B Wilson
Exercise-associated gastrointestinal (GI) distress can negatively impact athletic performance and interfere with exercise training. Although there are a few universal underlying causes of GI distress, each symptom often has its own unique triggers and, therefore, its own prevention and management strategies. One of the most troubling GI symptoms an athlete can experience during training and competition is nausea/vomiting. The prevalence of nausea varies with several factors, two of the most important being exercise intensity and duration...
July 4, 2019: Sports
Hyun Chul Jung, Nan Hee Lee, Smith D John, Sukho Lee
This study examined the acute effects of the elevation training mask (ETM) on haemodynamics and heart rate variability (HRV) at rest, during cycling, and during recovery in healthy adults. Fifteen healthy male (N=9) and female (N=6) adults (27.0 ± 1.14 years) completed two trials with the mask (MASK) and without the mask (CON). The 40-minute cycling exercise protocol included 10-minute phases of (1) rest, (2) 50% of VO2peak cycling, (3) 70% of VO2peak cycling, and (4) recovery. Blood pressure and pulse oximetry saturation (SP O2 ) were measured at each phase...
June 2019: Biology of Sport
Brittney Hartle, Aishwarya Sudhama, Lesley M Deas, Robert S Allison, Elizabeth L Irving, Mackenzie G Glaholt, Laurie M Wilcox
OBJECTIVE: We examined the contribution of binocular vision and experience to performance on a simulated helicopter flight task. BACKGROUND: Although there is a long history of research on the role of binocular vision and stereopsis in aviation, there is no consensus on its operational relevance. This work addresses this using a naturalistic task in a virtual environment. METHOD: Four high-resolution stereoscopic terrain types were viewed monocularly and binocularly...
June 18, 2019: Human Factors
Anamika Gangwar, Pooja, Manish Sharma, Krishan Singh, Anita Patyal, Gopinath Bhaumik, Kalpana Bhargava, Niroj Kumar Sethy
Intermittent hypoxic training (IHT) is a discrete cost-effective method for improving athletic performance and high altitude acclimatization. Unfortunately, IHT protocols widely vary in terms of hypoxia severity, duration, and number of cycles affecting physiological outcomes. In the present study, we evaluated the efficacy of a moderate normobaric IHT protocol (12% FiO2 for 4 h, 4 days) on acclimatization to high altitude (3250 m). Global plasma proteomics studies revealed that IHT elicited acute-phase response proteins like C-reactive protein (CRP), serum amyloid A-1 protein (SAA), and alpha-1-acid glycoprotein 2 (AGP 2) as well as altered levels of several apolipoproteins...
July 2019: Pflügers Archiv: European Journal of Physiology
Shaun Sutehall, Borja Muniz-Pardos, Giscard Lima, Guan Wang, Fernanda Rossell Malinsky, Andrew Bosch, Irina Zelenkova, Kumpei Tanisawa, Fabio Pigozzi, Paolo Borrione, Yannis Pitsiladis
The benefit of training at altitude to enhance exercise performance remains equivocal although the most widely accepted approach is one where the athletes live and perform lower-intensity running at approximately 2300 m with high-intensity training at approximately 1250 m. The idea is that this method maintains maximal augmentations in total hemoglobin mass while reducing the performance impairment of high-intensity sessions performed at moderate altitude and thus preventing any detraining that can occur when athletes live and train at moderate altitude...
April 2019: Current Sports Medicine Reports
Grégoire P Millet, Kilian Jornet
AIMS: The present case study aims to present the acclimatization strategy employed by an elite athlete prior two successful ascents to Everest (including a "fastest known time") in one week. METHODS: Training volume and content and altitude exposure were recorded daily. Vertical velocity was recorded by GPS-HR monitor. RESULTS: The subject used first a LHTLH (Living High Training Low and High) pre-acclimatization method in normobaric hypoxia (NH)...
April 8, 2019: International Journal of Sports Physiology and Performance
Asmamaw Gebrehiwot, Leila Hashemi-Beni, Gary Thompson, Parisa Kordjamshidi, Thomas E Langan
Flooding is one of the leading threats of natural disasters to human life and property, especially in densely populated urban areas. Rapid and precise extraction of the flooded areas is key to supporting emergency-response planning and providing damage assessment in both spatial and temporal measurements. Unmanned Aerial Vehicles (UAV) technology has recently been recognized as an efficient photogrammetry data acquisition platform to quickly deliver high-resolution imagery because of its cost-effectiveness, ability to fly at lower altitudes, and ability to enter a hazardous area...
March 27, 2019: Sensors
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