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). During the fatigue tests participants initially performed a 10 s all-out effort followed by a constant-load test with 10 s all-out bouts interspersed every minute. The load for the initial two fatigue tests was 80% of the peak power (PP) achieved during the graded test and these continued until failure. The remaining two fatigue tests were performed at 20% PP and were limited to the times achieved during the 80% PP tests. During the EMG tests subjects performed a 10 s all-out effort followed by a constant-load test to failure at 80% PP. Normalised EMG activities (% maximum, NEMG) were assessed in five lower limb muscles. Maximum power and maximum EMG activity prior to each fatigue and EMG test were unaffected by posture. The rate of fatigue at 80% PP was significantly higher during supine compared with upright posture (-68 +/- 14 vs. -26 +/- 6 W min(-1), respectively, P < 0.05) and the divergence of the fatigue responses occurred by the second minute of exercise. NEMG responses were significantly higher in the supine posture by 1-4 min of exercise. Results show that fatigue is significantly greater during supine compared with upright high-intensity cycling and this effect is accompanied by a reduced activation of musculature that is active during cycling.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Egaña M,Ryan K,Warmington SA,Green Sdoi
10.1007/s00421-009-1254-8subject
Has Abstractpub_date
2010-03-01 00:00:00pages
649-56issue
4eissn
1439-6319issn
1439-6327journal_volume
108pub_type
杂志文章,随机对照试验abstract::The purpose of the current investigation was to determine whether sodium citrate enhances endurance cycling performance and, if so, what dosage(s) produces this effect. Eight trained [peak power output: 362 (48) W; power:weight: 5.1 (0.4) W x kg(-1), mean (SD)] male cyclists were requested to complete four, 40-km time...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s004210000264
更新日期:2000-11-01 00:00:00
abstract::Participation in at least 30 min of moderate intensity activity on most days is assumed to confer health benefits. This study accordingly determined whether the more vigorous household and garden tasks (sweeping, window cleaning, vacuuming and lawn mowing) are performed by middle-aged men at a moderate intensity of 3-...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-003-0932-1
更新日期:2004-01-01 00:00:00
abstract::This study evaluated time-dependent alterations in pulmonary vascular reactivity to acute hypoxia and to the administration of angiotensin II (AT-II) during and after chronic exposure to cold using isolated perfused lung specimens from rats. Animals were exposed to a cold environment (3.5 (mean) +/- 1.0 (SD) degrees C...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-007-0436-5
更新日期:2007-06-01 00:00:00
abstract::The effect of outdoor clothing and repeated cold exposure on blood pressure, heart rate, skin temperature, and thermal sensation was studied in 16 young (18-34 years) and 8 middle-aged (35-51 years) normotensive participants. Four winter clothing ensembles were used: regular winter clothing without a hat, with a hat, ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-009-1176-5
更新日期:2009-12-01 00:00:00
abstract::During competitions, elite cross-country skiers produce higher external work rates on uphill than on flat terrain. However, it is not presently known whether this reflects solely higher energy expenditure. Furthermore, the kinematic factors associated with these higher rates of uphill work have not yet been examined. ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-011-2261-0
更新日期:2012-08-01 00:00:00
abstract:PURPOSE:To compare the effects of different hypoxia severities on exercise capacity, cardio-respiratory, tissue oxygenation and neuromuscular fatigue characteristics in response to exhaustive intermittent cycling. METHODS:Eleven well-trained cyclists, repeated supra-maximal cycling efforts of 15 s (30% of anaerobic po...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-020-04495-2
更新日期:2021-01-01 00:00:00
abstract::We investigated changes in the P100 latency of the visual evoked potential (VEP) and the saccadic reaction time (SRT) in relation to the degree of activity of the shoulder girdle elevators. Muscle force was set in 10% increments from 0% to 50% of the maximal voluntary contraction (MVC). The VEP was derived from a midl...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-004-1151-0
更新日期:2004-08-01 00:00:00
abstract::The purpose of this study was to investigate the consequences of a high-speed boat transit on physical performance. Twenty-four Royal Marines were randomly assigned to a control (CON) or transit (TRAN) group. The CON group sat onshore for 3 h whilst the TRAN group completed a 3-h transit in open-boats running side-by-...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-010-1765-3
更新日期:2011-09-01 00:00:00
abstract::The fatality of deep hypothermia in non-hibernating mammals follows the cessation of respiration and heart beat, and a massive influx of calcium (Ca(++)) into cells. This review presents evidence relating to restoration of key physiological functions during hypothermia in several animal preparations. For example, in a...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-008-0875-7
更新日期:2009-01-01 00:00:00
abstract::The purpose of this study was to investigate the effect of heavy strength training on thigh muscle cross-sectional area (CSA), determinants of cycling performance, and cycling performance in well-trained cyclists. Twenty well-trained cyclists were assigned to either usual endurance training combined with heavy strengt...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-009-1307-z
更新日期:2010-03-01 00:00:00
abstract::The purpose of the present study was to investigate the electromyography (EMG) to torque relationship of the vastus intermedius (VI) muscle. Thirteen healthy men performed maximal voluntary contraction (MVC) and submaximal contraction during isometric knee extension at 10% of the MVC to 90% of the MVC at intervals of ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-009-1064-z
更新日期:2009-07-01 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::There is a disparity in the information about the heritability of the response of muscle anaerobic metabolism to exercise and the use of explosive power, as well as a lack of information concerning the genetic determinants of this form of work, as measured using different specific physical tests. We applied a battery ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210100522
更新日期:2002-01-01 00:00:00
abstract::Post-exercise cardiac vagal reactivation is well-investigated; however, the effect of water intake during this period has not been well studied. Therefore, our aim was to assess the influence of water intake on the cardiac vagal reactivation after 30 min of a submaximal cycling exercise. Ten healthy subjects (eight me...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-007-0584-7
更新日期:2008-02-01 00:00:00
abstract::The purpose of this study was to investigate the influence of intense exercise on the metabolism of adenine nucleotides in the liver. In the first experiment, to determine the degradation of adenine nucleotides, hepatic adenine nucleotides of rats were labeled by an intraperitoneal administration of 15N-labeled adenin...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-005-0106-4
更新日期:2006-03-01 00:00:00
abstract::Recent investigations have suggested that changes in contractile protein expression contribute to reductions in skeletal muscle function during congestive heart failure (CHF). Myosin heavy chain (MHC), a major contractile protein, has been shown to undergo alterations in protein isoform expression during CHF. The purp...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-002-0615-3
更新日期:2002-06-01 00:00:00
abstract:PURPOSE:Our aim was to examine whether cognitive processing during walking increases the metabolic cost of transport in healthy young adults. METHODS:Twenty healthy, young adults completed five conditions: (1) walking at a self-selected speed (spontaneous single-task), (2) seated resting (baseline), (3) performing cog...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-017-3536-x
更新日期:2017-04-01 00:00:00
abstract::Knowledge about energy requirements during exercises seems necessary to develop training concepts in combat sport Karate. It is a commonly held view that the anaerobic lactic energy metabolism plays a key role, but this assumption could not be confirmed so far. The metabolic cost and fractional energy supply of basic ...
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
abstract::The purpose of this study was to evaluate the effects of various modes of training on the time-course of changes in lipoprotein-lipid profiles in the blood, cardiovascular fitness, and body composition after 16 weeks of training and 6 weeks of detraining in young women. A group of 48 sedentary but healthy women [mean ...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s004210000234
更新日期:2000-08-01 00:00:00
abstract::To examine the effects of lower-limb unilateral resistance exercise on central and peripheral arterial stiffness, thirteen participants (7 male and 6 female, mean age = 21.5 +/- 0.7 years) performed leg press exercise using their dominant leg. Pulse wave velocity (PWV) was used to measure central (carotid to femoral) ...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-006-0259-9
更新日期:2006-09-01 00:00:00
abstract:PURPOSE:Our purpose was to compare supramaximal versus submaximal intensity eccentric training performed until volitional fatigue. METHODS:Thirty-two young adults (19 males) were randomized into one of three groups: (1) ECC110 performed eccentric (ECC) only contractions at 110% of concentric (CON) 1-repetition maximum...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-017-3700-3
更新日期:2017-10-01 00:00:00
abstract::Hypothermia is commonly found in accidents on land and at sea, yet its pulmonary circulatory effects have not been studied before. To study the effects of hypothermia on the right heart function and pulmonary circulation, cardiac catheterization was carried out on nine anaesthetized beagle dogs. The dogs were cooled b...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s004210050059
更新日期:2000-03-01 00:00:00
abstract::It is well known that there is a relationship between the voice the human emotional status. Previous studies have demonstrated that changes of fundamental frequency ( f(0)), in particular, have a significant relationship with emotional load. The aim of the present study was to investigate how f(0) changes in response ...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-002-0625-1
更新日期:2002-07-01 00:00:00
abstract::Exercise critical power (CP) has been shown to represent the highest sustainable work rate (WR) in patients with chronic obstructive pulmonary disease (COPD). Parameter estimation, however, depends on 4 high-intensity tests performed, on different days, to the limit of tolerance (T(lim)). In order to establish a milde...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-005-0064-x
更新日期:2006-01-01 00:00:00
abstract:PURPOSE:To assess the influence of a simulated altitude exposure (~2,900 m above sea level) for a 3 h recovery period following intense interval running on post-exercise inflammation, serum iron, ferritin, erythropoietin, and hepcidin response. METHODS:In a cross-over design, ten well-trained male endurance athletes c...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-014-2829-6
更新日期:2014-05-01 00:00:00
abstract::Sildenafil and epoprostenol are effective therapies in pulmonary arterial hypertension (PAH). Both drugs increase cardiac output, which has been in part attributed to improved right ventricular (RV) contractility. We therefore used tissue Doppler imaging (TDI) to test whether sildenafil and epoprostenol might differen...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-011-2085-y
更新日期:2012-04-01 00:00:00
abstract::Equivocal findings have been reported in the few studies that examined the impact of ambient temperature (T a) and hypohydration on cognition and dynamic balance. The purpose of this study was to determine the impact of acute exposure to a range of ambient temperatures (T(a) 10-40 °C) in euhydration (EUH) and hypohydr...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-012-2506-6
更新日期:2013-04-01 00:00:00
abstract:PURPOSE:Current methods for estimating muscle motor unit (MU) number provide values which are remarkably similar for muscles of widely differing size, probably because surface electrodes sample from similar and relatively small volumes in each muscle. We have evaluated an alternative means of estimating MU number that ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-018-3811-5
更新日期:2018-04-01 00:00:00
abstract::Transcutaneous electrical nerve stimulation (TENS) increases local blood flow. It is not known whether increase in blood flow may be caused by inhibition of sympathetic activity, mediated by muscle metaboreflex activity. The purpose of this study was to evaluate the effect of TENS on metaboreflex activation and heart ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-011-2084-z
更新日期:2012-04-01 00:00:00
abstract::Our objective was to determine the effects of long-lasting endurance events on the energy cost of running (C(r)), and the role of maximal oxygen uptake (VO(2max)), its fractional utilisation (F) and C(r) in determining the performance. Ten healthy runners (age range 26-59 years) participated in an ultra-endurance comp...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-011-2120-z
更新日期:2012-05-01 00:00:00