Abstract:
:Adaptations to chronic hypoxia involve changes in membrane transport proteins. The underlying mechanism of this response may be related to concomitant occurring changes in erythropoietin (Epo) levels. We therefore tested the direct effects of recombinant human erythropoietin (rHuEpo) treatment on the expression of muscle membrane transport proteins. Likewise, improvements in performance may involve upregulation of metabolic enzymes. Since Epo is known to augment performance we tested the effect of rHuEpo on some marker enzymes that are related to aerobic capacity. For these purposes eight subjects received 5,000 IU rHuEpo every second day for 14 days, and subsequently a single dose of 5,000 IU weekly for 12 weeks. Muscle biopsies were obtained before and after 14 weeks of rHuEpo treatment. The treatment increased hematocrit (from 44.7 to 48.8%), maximal oxygen uptake by 8.1%, and submaximal performance by approximately 54%. Membrane transport systems and carbonic anhydrases involved in pH regulation remained unchanged. Of the Na(+), K(+)-pump isoforms only the density of the alpha2 subunit was decreased (by 22%) after treatment. The marker enzymes cytochrom c and hexokinase remained unchanged with the treatment. In conclusion, changes in muscle membrane transport proteins and selected muscle enzymes do not contribute to the Epo-induced improvement in performance.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Juel C,Thomsen JJ,Rentsch RL,Lundby Cdoi
10.1007/s00421-007-0567-8subject
Has Abstractpub_date
2007-12-01 00:00:00pages
41-4issue
1eissn
1439-6319issn
1439-6327journal_volume
102pub_type
杂志文章abstract:PURPOSE:The purpose of this study was to investigate how much the distance between stimulation electrodes affects the knee extension torque in tetanic, electrically elicited contractions. METHODS:Current pulses of progressively larger amplitude, from 0 mA to maximally tolerated intensities, were delivered at 20 pps to...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-015-3289-3
更新日期:2016-02-01 00:00:00
abstract:PURPOSE:Topical application of nonivamide-nicoboxil cream to resting legs has been shown to enhance the level of oxygenated haemoglobin in leg muscles 15 min later. Here, we examined whether such application improves the performance of experienced cyclists in a subsequent 4-km time-trial. METHODS:Nine male cyclists [2...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-016-3357-3
更新日期:2016-05-01 00:00:00
abstract::The diving response is the sequence of cardiovascular, respiratory and metabolic adjustments produced by apnoea and further strengthened by cooling of the facial area and/or hypoxia. This study aimed at comparing the cardiovascular response to diving of trained divers with that of a control group. In this order, 14 tr...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-011-2006-0
更新日期:2012-02-01 00:00:00
abstract::This study examined the influence of prior endurance exercise on hormonal responses to subsequent resistance exercise. Ten males exercised on a cycle ergometer at 50% of maximal oxygen uptake for 60 min and subsequently completed a resistance exercise (bench and leg press, four sets at ten repetitions maximum with an ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-004-1296-x
更新日期:2005-06-01 00:00:00
abstract::Thirty-two untrained men [mean (SD) age 22.5 (5.8) years, height 178.3 (7.2) cm, body mass 77.8 (11.9) kg] participated in an 8-week progressive resistance-training program to investigate the "strength-endurance continuum". Subjects were divided into four groups: a low repetition group (Low Rep, n = 9) performing 3-5 ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-002-0681-6
更新日期:2002-11-01 00:00:00
abstract:PURPOSE:The twofold purpose of this study was (1) to compare differences in development and etiology of neuromuscular fatigue at different plantar flexor (PF) muscle-tendon unit (MTU) lengths between boys and men, and (2) to examine the relationship between musculotendinous stiffness and peripheral fatigue. METHODS:Ni...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-020-04305-9
更新日期:2020-03-01 00:00:00
abstract::The aim of the present study was to define the determinants of the energy cost of swimming (Cs) in children. Eleven healthy children [mean (SD) age: 12.42 (0.53) years] who practised 7.5-8.5 h x week(-1) volunteered to take part in this study. Anthropometric dimensions such as height (H), body mass (BM), hydrostatic l...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-001-0564-2
更新日期:2002-05-01 00:00:00
abstract::Many thermal physiologists follow the conventional wisdom that physiological heat adaptations occur in the summer for people living in a humid continental climate (e.g. Central Canada, North-eastern and Mid-western United States and Eastern Europe); therefore experimentation across seasons is often avoided. However, s...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-010-1743-9
更新日期:2011-06-01 00:00:00
abstract::Free radical production and high catecholamine levels are implicated in the modulation of Na(+), K(+)-ATPase, and Mg(2+)-ATPase activities. The aim of this study was to investigate the effect of the mode of delivery on the above-mentioned enzyme activities in maternal-neonatal erythrocyte membrane. Women with normal p...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-008-0744-4
更新日期:2008-07-01 00:00:00
abstract::This study compared the rate of fatigue and lower limb EMG activities during high-intensity constant-load cycling in upright and supine postures. Eleven active males performed seven cycling exercise tests: one upright graded test, four fatigue tests (two upright, two supine) and two EMG tests (one upright, one supine)...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-009-1254-8
更新日期:2010-03-01 00:00:00
abstract::It has been well demonstrated that the principal factor responsible for oxidative damage during exercise is the increase in oxygen consumption. However, other theoretical factors (acidosis, catecholamine autoxidation, ischemia-reperfusion syndrome, etc.) that are known to induce, in vitro, oxidative damage may also be...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-002-0767-1
更新日期:2003-03-01 00:00:00
abstract::The aim of this study was to analyze the dynamic behavior of the high-frequency component (HF > 0.15 Hz) of heart rate variability (HRV) and the respiratory frequency in relation to the anaerobic threshold (AT). Twenty-two healthy subjects [mean (SD) age: 24 (6) years, height: 175 (10) cm, body mass: 65 (11) kg] compl...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210000302
更新日期:2000-11-01 00:00:00
abstract::Session RPE (SRPE) permits subjective ratings of global effort following exercise. SRPE is useful for evaluating training load; however, mediating factors are not well understood. This study compared SRPE among treadmill trials at a clamped workload with a varied duration. Ten subjects (VO(2)max: 48.9 +/- 10.5 ml kg(-...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-009-1153-z
更新日期:2009-11-01 00:00:00
abstract::A number of mechanisms have been proposed to explain the elevation in oxygen consumption following exercise. Biochemical processes that return muscle to its pre-exercise state do not account for all of the extra oxygen consumed after exercise (excess post-exercise oxygen consumption, EPOC). Muscle at rest after aerobi...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-007-0578-5
更新日期:2007-12-01 00:00:00
abstract::The purpose of this study was to investigate the effects of resistance training on the morphological and functional properties of human lower limb muscles during 20 days of 6 degrees head-down-tilt bed rest. Nine men were randomly assigned to the resistance training group (BR-Tr, n = 5) or the non-training, control gr...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s004210050648
更新日期:2000-05-01 00:00:00
abstract::The compound muscle action potential (M wave) has been commonly used to assess the peripheral properties of the neuromuscular system. More specifically, changes in the M-wave features are used to examine alterations in neuromuscular propagation that can occur during fatiguing contractions. The utility of the M wave is...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-017-3788-5
更新日期:2018-03-01 00:00:00
abstract::The cardiovascular benefits of exercise are well known. In contrast, the impact of lifelong endurance exercise is less well understood. Long-term high-intensity endurance exercise is associated with changes in cardiac morphology together with electrocardiographic alterations that are believed to be physiologic in natu...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-010-1534-3
更新日期:2010-10-01 00:00:00
abstract::The present study investigated the use of a tri-axial accelerometer, Tracmor2, for the measurement of physical activity in children. Eleven children [age 6.9 (2.2) years, body mass 19.5 (5.3) kg and height 112.3 (14.4) cm] were studied. Total daily energy expenditure (TDEE) was measured using the doubly labeled water ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-003-0891-6
更新日期:2003-08-01 00:00:00
abstract::The sleep-wake state has a profound influence on many, perhaps most, aspects of normal physiology and is strongly implicated in the mediation (or remediation) of impaired health and performance. Many sleep disorders stem from abnormal respiratory anatomy or sleep-induced changes in respiratory control, underscoring th...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-002-0610-8
更新日期:2002-07-01 00:00:00
abstract::According to the literature the steady-state level of phosphocreatine (PCr) has a linear relationship to the workload during muscle exercise intensities below the lactate threshold, whereas this linearity is impaired during exercise intensities above the lactate threshold. The purpose of this study was to investigate ...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-004-1233-z
更新日期:2005-01-01 00:00:00
abstract::The percutaneous muscle biopsy technique is an important tool used in exercise and applied physiology to study human skeletal muscle structure, adaptation, and regeneration. One important use of this technique has been the assessment of ultrastructural muscle damage, especially in tissue samples obtained following str...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s004210000287
更新日期:2000-11-01 00:00:00
abstract::Local muscle fatigue can originate from both peripheral and central factors. The relative contribution of these factors in the course of a fatiguing contraction in 20 healthy subjects was determined. While subjects made a 2-min sustained maximal voluntary contraction (MVC) of the biceps brachii, muscle fibre conductio...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-003-0913-4
更新日期:2003-11-01 00:00:00
abstract::To identify the effect of normal breathlessness sensation elicited during intense intermittent exercise at exhaustion on limitation of exercise maintenance (Ex), the contribution of the flow-resistive unloading effect of normoxic helium-oxygen breathing on the breathlessness sensation to the change in the Ex was exami...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s00421-004-1094-5
更新日期:2004-07-01 00:00:00
abstract::This study aimed to determine whether brief hypoxic stimuli in a hypobaric chamber are able to elicit erythropoietin (EPO) secretion, and to effectively stimulate erythropoiesis in the short term. In two different experiments, a set of haematological, biochemical, haemorheological, aerobic performance, and medical tes...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210050669
更新日期:2000-06-01 00:00:00
abstract:PURPOSE:Locomotor muscle fatigue impairs exercise performance during time to exhaustion tests. However, its effect on self-regulation of power output (pacing) is unknown. The primary aim of this study was to investigate the effects of locomotor muscle fatigue on pacing and time trial performance. METHODS:Ten healthy r...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-013-2673-0
更新日期:2013-09-01 00:00:00
abstract::The aim of this study was to investigate the influence of different intermittent myofeedback training schedules, as provided by a Cinderella-based myofeedback system, on learning relaxation and resistance to extinction of the trapezius muscle, in subjects performing a unilateral gross-motor task. Eighteen healthy subj...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s00421-004-1161-y
更新日期:2004-10-01 00:00:00
abstract::Ten male and ten female young adults trained the knee extensors of one leg eccentrically and those of the other concentrically for 6 weeks, using a gymnasium leg-extension machine. Before and after training, both legs of each subject were tested isometrically for maximum voluntary knee-extensor force, and in both ecce...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s004210000221
更新日期:2000-08-01 00:00:00
abstract::High-intensity exercise shares similarities with acute phase responses of inflammatory diseases. We investigated the influences of acute exercise on inflammatory markers, plasma pentraxin3 (PTX3) and serum high-sensitive C-reactive protein (CRP) (hsCRP). Nine healthy male subjects (41 ± 3 years old) participated. Each...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-010-1572-x
更新日期:2010-11-01 00:00:00
abstract:PURPOSE:This study assessed the utility of the Children's Effort Rating Table (CERT) and the Eston-Parfitt (EP) Scale in estimating peak oxygen uptake ([Formula: see text]) in children, during cardiopulmonary exercise testing (CPET) on a treadmill. METHODS:Fifty healthy children (n = 21 boys; 9.4 ± 0.9 years) complete...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-016-3377-z
更新日期:2016-06-01 00:00:00
abstract::The purpose of this study was to examine the physiological effects of 3000-m swimming on subsequent 3-h cycling time trial performance in ultraendurance triathletes. Eight highly trained ultraendurance triathletes [mean (SEM) age 34 (2) years, body fat 12.5 (0.8)%, maximum oxygen consumption 63.2 (2.1) ml x kg(-1) x m...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s004210000229
更新日期:2000-09-01 00:00:00