Abstract:
:Aerobic exercise performance decreases upon ascent to altitude whereas anaerobic performance remains unchanged. Although the effects of 1 - 3 wk of altitude acclimatization on both aerobic and anaerobic exercise performance have been well studied, the effects of short-term altitude acclimatization (i.e., 45 h) on these parameters have not been well defined. Therefore, both aerobic and anaerobic exercise performance was evaluated in five healthy men (51.4 +/- 7.7 years, 175 +/- 4.2 cm, and 73.8 +/- 6.1 kg) at low altitude (LA, 600 m), upon acute exposure (approximately 1 - 3 h) to 3200 m (HA1) and on the third day of altitude exposure (HA3, 3200 m). Subjects performed three consecutive exercise tests, separated by approximately 1 - 3 h of rest, of various durations (i.e., 30 s, 5 min, and 50 min) on a cycle ergometer in each environmental condition. Anaerobic cycling performance (i. e., 30 s) was the same at LA, HA1, and HA3. Aerobic cycling performance (i. e., 5 min and 50 min) was reduced by 12.0 and 11.3 %, respectively, upon acute exposure to altitude. There was no change in the 5-min cycling performance but the 50-min cycling performance improved by 5.7 % from HA1 to HA3 which implies a 50 % recovery of the initial loss. These findings are important for individuals going to high altitude for work, for athletic competition, or recreation.
journal_name
Int J Sports Medjournal_title
International journal of sports medicineauthors
Burtscher M,Faulhaber M,Flatz M,Likar R,Nachbauer Wdoi
10.1055/s-2005-872823subject
Has Abstractpub_date
2006-08-01 00:00:00pages
629-35issue
8eissn
0172-4622issn
1439-3964journal_volume
27pub_type
杂志文章abstract::The purpose of this study was to determine whether a player's physical impairment or activity profile was related to the amount of thermal strain experienced during wheelchair rugby match play. 17 elite wheelchair rugby players played a competitive match, whilst activity profiles, measures of core and skin temperature...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0042-121263
更新日期:2017-03-01 00:00:00
abstract::The changes in selected muscle and blood metabolites - blood catecholamines, cyclic AMP, glucagon, growth hormone, insulin, and C-peptide--were measured in five male long-distance runners after moderate 90 min (4.3 min/km) and intense 45 min (3.3 min/km) of continuous running exercises. After the 45-min exercise, the ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025851
更新日期:1985-10-01 00:00:00
abstract::The oxygen uptake (VO2) attained during a constant speed 800-m pace trial on a treadmill is less than the maximal VO2 (VO2max) in male middle-distance runners with a high VO2max (i.e., > 65 ml x kg (-1) x min (-1)). We therefore investigated whether the VO2 attained was influenced by the pacing strategy adopted. Eight...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2005-837468
更新日期:2006-01-01 00:00:00
abstract::Limited data exist concerning exercise training-induced alterations in skeletal muscle oxidative and antioxidant enzyme activity in senescent animals. Therefore, the purpose of this study was twofold: 1) to examine the exercise training-induced changes in oxidative and antioxidant enzyme activity in skeletal muscle of...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021290
更新日期:1992-07-01 00:00:00
abstract::Based on the importance of exercise and crucial role of liver in metabolism, the aim of this study was to determine whether the expression of peroxisome proliferator-activated receptor (PPAR)-α, γ and adiponectin receptor 2 in OLETF rat liver were altered in conjunction with improved metabolism with exercise training....
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0031-1271755
更新日期:2011-08-01 00:00:00
abstract::Aerobic performance is negatively impacted by tropical climate due to impairment of thermoregulatory mechanisms. We tested the hypothesis that a torso application of a 4% menthol solution would have the same effect on a best performance 10-km run as an external use of cold water. Thirteen trained male athletes complet...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-1062-6520
更新日期:2020-03-01 00:00:00
abstract::The purpose of this study was to determine the effect of a reduced ventilatory frequency (Vf) on blood gases and acid-base changes during three intensities of cycling exercise. VO2max and lactate threshold workload (LaT) of six subjects were assessed on a Monark ergometer. Experimental rides were performed 1) with no ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024657
更新日期:1991-02-01 00:00:00
abstract::This study compared physiological responses associated with exercise tolerance in girls (G) and women (W) of similar fitness and heat acclimatization level during exercise in a hot and humid outdoor environment (33.4 degrees C and 55.1 % RH; WBGT = 29.9 +/- 0.2 degrees C). Nine pre-menarcheal G (age = 11.3 yr) and nin...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2006-923863
更新日期:2006-12-01 00:00:00
abstract::The present paper reviews evidence for the role of specific amino acids in the etiology of fatigue and the overtraining syndrome in athletes. An increase in the plasma concentration ratio of free tryptophan: branched-chain amino acids may mediate an increase in 5-HT synthesis in the brain and thus induce fatigue durin...
journal_title:International journal of sports medicine
pub_type: 杂志文章,评审
doi:10.1055/s-2007-1024863
更新日期:1990-05-01 00:00:00
abstract::This study assessed the validity of a photoplethysmographic heart rate (HR) monitor, the Polar OH1 in various sports performed in ecological conditions: running, cycling, soccer, kayaking, walking, tennis and fitness. Seventy trained athletes (56 males, 14 females) wore the Polar OH1 armband and the H7 chest belt duri...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0875-4033
更新日期:2019-07-01 00:00:00
abstract::The aim of this study was to establish the presence of postural deficits in subjects with chronic ankle instability (CAI) and to assess the effect of an 8-week balance training program on dynamic postural control. A total of 43 subjects with CAI and 31 controls participated in this case-control study. Participants wit...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0034-1396823
更新日期:2015-06-01 00:00:00
abstract::The albuminuria occurring after swimming in splenectomized dogs was investigated. Swimming in splenectomized dogs induces metabolic acidosis, a decrease in renal vascular conductance, and an increase in plasma renin activity, all three factors possibly implicated in the occurrence of albuminuria. The administration of...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025922
更新日期:1984-12-01 00:00:00
abstract::Measurement of skeletal muscle strength gains increasing importance as outcome parameter in patients with chronic heart failure. This study aimed at establishing short-term reliability of isokinetic strength measurements of knee extensor and flexor muscles in 38 patients with chronic heart failure. Strength tests were...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2001-11360
更新日期:2001-01-01 00:00:00
abstract::The main goal of the preventive intervention study in one community of the German CINDI (Countrywide Integrated Non-Communicable Diseases Intervention programme of the WHO) area was to improve cardiovascular health by reducing the risk factors smoking, hypertension, obesity, hypercholesterolaemia, and by changing sede...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-972639
更新日期:1997-05-01 00:00:00
abstract::This randomized, double-blind, placebo-controlled study examined the influence of 6% carbohydrate ingestion on hormonal and lymphocyte proliferative responses (5 total samples over 9 hours) to 2.5 h of high-intensity running by 30 experienced marathon runners. The T-cell response differed between groups, with the plac...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1055/s-2007-971962
更新日期:1998-11-01 00:00:00
abstract::To examine measures of total and regional body composition using dual X-ray absorptiometry (DXA) in NCAA Division I collegiate equestrian athletes, 31 female collegiate equestrian athletes were matched to a population of normal controls by age and body mass index. Total and regional fat tissue mass (FM), lean tissue m...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0863-4607
更新日期:2019-05-01 00:00:00
abstract::The O2 equivalent of lactic acid accumulation in blood was estimated from data on ten subjects acclimatized to altitudes up to 6500 m in the course of a Mt. Everest expedition. The calculated value of the O2 equivalent of La by standard least squares regression was 2.07 +/- 0.4 l O2 for a rise of blood lactic acid con...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1024850
更新日期:1990-02-01 00:00:00
abstract::Adequate reliability studies of knee flexion and extension are currently available for isokinetic measurements, but not for the shoulder joint. For this reason, this study examines the variability (%) in the determination of peak torque (PT) and the angle at peak torque (AP) in the test-retest procedure. Differentiati...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2007-1021106
更新日期:1994-01-01 00:00:00
abstract::The effect of recovery duration on performance and fatigue pattern during short exercises was studied including and excluding the flywheel inertia. Subjects (11 males and 11 females) performed a force-velocity test to determine their optimal force (f (opt)). On the following day, subjects performed randomly 4 series o...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2003-45262
更新日期:2004-04-01 00:00:00
abstract:BACKGROUND:In international cycling and cross-country skiing competitions, blood tests are used to unmask the performance enhancing misuse of erythropoietin. Haematocrit (cycling) and haemoglobin (cross-country skiing) limits have been set by international sporting federations (haematocrit 50%, haemoglobin 18.5 g/dl). ...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2000-3785
更新日期:2000-07-01 00:00:00
abstract::Sprint cycling performance is heavily dependent on mechanical peak power output (PPO) and the underlying power- and torque-cadence relationships. Other key indices of these relationships include maximum torque (TMAX), cadence (CMAX) and optimal cadence (COPT). Two common methods are used in the laboratory to ascertain...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/a-0989-2387
更新日期:2019-12-01 00:00:00
abstract::This study examined injury and physical fitness outcomes in Basic Combat Training (BCT) during implementation of Physical Readiness Training (PRT). PRT is the U.S. Army's emerging physical fitness training program. An experimental group (EG, n = 1284), which implemented the PRT program, was compared to a control group...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2003-40710
更新日期:2003-07-01 00:00:00
abstract::The influence of a short, supramaximal task of 30 s duration on plasma volume (PV) was tested in 14 female physical education students. Hemoglobin (Hb), hematocrit (Hct), and osmolality (Osm) were tested pre- and post-exercise. Performance of the exercise test, consisting of 30 s all-out pedaling against a load of 4.4...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1026093
更新日期:1982-11-01 00:00:00
abstract::Previous studies have demonstrated conflicting results on the effects of acute exercise on FMD. The aim of the study was to examine brachial artery FMD before and after 3 bouts of acute exercise performed at different intensities. 10 healthy males (mean±SD age: 22±1 years) completed 30 min of cycling at 50, 70 and 85%...
journal_title:International journal of sports medicine
pub_type: 杂志文章,随机对照试验
doi:10.1055/s-0032-1323829
更新日期:2013-05-01 00:00:00
abstract::The aim of the present study was to evaluate a heart transplanted patient who ran a 20-km race 9 months after surgery. Thirty-six healthy male subjects were studied during the same run and served as control group. Biochemical variables were determined in blood and urine samples collected before and after the race. Pos...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2008-1025867
更新日期:1985-12-01 00:00:00
abstract::Pre-exercise meals containing carbohydrates (CHO) are recommended to athletes, although there is evidence to suggest that a high fat meal prior to exercise increases utilisation of fats yet may not adversely affect performance. This study investigated the effect of a high fat and high CHO pre-exercise meal prior to hi...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-0032-1321798
更新日期:2013-02-01 00:00:00
abstract::Spatio-temporal, metabolic and psychometric responses during and after a 400-m freestyle swim trial were investigated for gender and skill-level effects. Thirty-four men and women, 18 national and international competitors and 16 recreational swimmers, were compared. Mean speed, stroke rate (SR), and stroke length (SL...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2006-924208
更新日期:2007-02-01 00:00:00
abstract::The objective of our study was to evaluate the effect of taping on the dynamic postural stability during a jump landing protocol in subjects with chronic ankle instability (CAI). For this purpose, 28 subjects with CAI performed a sagittal and frontal plane landing task in a non-taped and taped condition. As main outco...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-0034-1385884
更新日期:2015-04-01 00:00:00
abstract::Muscle biopsies from m. vastus lateralis of two world class shot putters (shot putter 1 and 2) and the untrained brother of shot putter 1 were analyzed for fiber type distribution with ATPase staining and in situ hybridization for the expression of alkali myosin light chain (MLC) isoforms. Shot putter 2 had a predomin...
journal_title:International journal of sports medicine
pub_type: 临床试验,杂志文章
doi:10.1055/s-2003-39092
更新日期:2003-04-01 00:00:00
abstract::Cyclists often use heart rate limits or power output zones, obtained from lactate parameters during incremental exercise testing, to control training intensity. However, the relationship between heart rate or power output, and blood lactate can be changed by several factors including dehydration. Therefore, in the cur...
journal_title:International journal of sports medicine
pub_type: 杂志文章
doi:10.1055/s-2005-837460
更新日期:2005-12-01 00:00:00