Abstract:
:Muscle fiber conduction velocity (MFCV) has often been shown to decrease during standardized fatiguing isometric contractions. However, several studies have indicated that the MFCV may remain constant during fatiguing dynamic exercise. It was investigated if these observations can be related to the absence of a large decrease in pH and if MFCV can be considered as a good indicator of acidosis, also during dynamic bicycle exercise. High-density surface electromyography (HDsEMG) was combined with read-outs of muscle energetics recorded by in vivo (31)P magnetic resonance spectroscopy (MRS). Measurements were performed during serial exhausting bouts of bicycle exercise at three different workloads. The HDsEMG recordings revealed a small and incoherent variation of MFCV during all high-intensity exercise bouts. (31)P MRS spectra revealed a moderate decrease in pH at the end of exercise (~0.3 units down to 6.8) and a rapid ancillary drop to pH 6.5 during recovery 30 s post-exercise. This additional degree of acidification caused a significant decrease in MFCV during cycling immediately after the rest period. From the data a significant correlation between MFCV and [H(+)] ([H(+)] = 10(-pH)) was calculated (p < 0.001, Pearson's R = -0.87). Our results confirmed the previous observations of MFCV remaining constant during fatiguing dynamic exercise. A constant MFCV is in line with a low degree of acidification, considering the presence of a correlation between pH and MFCV after further increasing acidification.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Schmitz JP,van Dijk JP,Hilbers PA,Nicolay K,Jeneson JA,Stegeman DFdoi
10.1007/s00421-011-2119-5subject
Has Abstractpub_date
2012-05-01 00:00:00pages
1593-602issue
5eissn
1439-6319issn
1439-6327journal_volume
112pub_type
杂志文章abstract::Musculoskeletal disorders in the neck and shoulder area are a major occupational concern in the European countries especially among elderly females. The aim was to assess these disorders based on quantitative EMG indicators and functional tests. 252 female computer users (45-68 years) were recruited from four European...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-005-0042-3
更新日期:2006-01-01 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::The purpose of this review is to explore existing research on the physiological aspects of difficult rock climbing. Findings will be categorized into the areas of an athlete profile and an activity model. An objective here is to describe high-level climbing performance; thus the focus will primarily be on studies that...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-003-1036-7
更新日期:2004-04-01 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
abstract::Using an improved Peronnet-Thibault model to analyse the maximal power available during exercise, it was found that a 3rd-order relaxation process for the decreasing dynamics of aerobic power can describe accurately the data available for world track records and aerobic-to-total energy ratio (ATER). It was estimated t...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-001-0555-3
更新日期:2002-04-01 00:00:00
abstract:PURPOSE:We examined the effect of ischemic preconditioning (IPC) on changes in muscle force, activation, and the spinal reflex pathway during and after repeated sprint cycling. METHODS:Eight recreationally active men (high-intensity cardiorespiratory training > 3 times per week, > 6 months) completed two exercise sess...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-020-04359-9
更新日期:2020-05-01 00:00:00
abstract::The chronic fatigue syndrome (CFS) has been shown to be associated with orthostatic intolerance and cardiovascular dysregulation. We investigated the cardiovascular responses to combined orthostatic stress and isometric exercise in adolescents with CFS. We included a consecutive sample of 15 adolescents 12-18 years ol...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-007-0634-1
更新日期:2008-04-01 00:00:00
abstract:PURPOSE:In trail running and in uphill races many athletes use poles. However, there are few data about pole walking on steep uphill. The aim of this study was to compare the energy expenditure during uphill walking with (PW) and without (W) poles at different slopes. METHODS:Fourteen mountain running athletes walked ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-019-04145-2
更新日期:2019-07-01 00:00:00
abstract:PURPOSE:To examine the effect of acute quercetin (Q) ingestion on neuromuscular function, biomarkers of muscle damage, and rate of perceived exertion (RPE) in response to an acute bout of resistance training. METHODS:10 young men (22.1 ± 1.8 years, 24.1 ± 3.1 BMI) participated in a randomized, double-blind, crossover ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-018-3834-y
更新日期:2018-05-01 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::An objective of a warm-up prior to an athletic event is to optimize performance. Warm-ups are typically composed of a submaximal aerobic activity, stretching and a sport-specific activity. The stretching portion traditionally incorporated static stretching. However, there are a myriad of studies demonstrating static s...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-011-1879-2
更新日期:2011-11-01 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:PURPOSE:The aim of the present study was to understand the role of central (cardiovascular O2 delivery) and peripheral factors (muscle level) in limiting the maximal aerobic performance in obese (OB) subjects. METHODS:Fifteen OB (mean age ± SD 25 ± 7 years; BMI 43 ± 7 kg/m2) and 13 lean sedentary subjects (CTRL, age 2...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-019-04167-w
更新日期:2019-08-01 00:00:00
abstract::The aim of this study was to determine the effect of cycle intensity on subsequent running performance and combined cycle-run (CR) performance. Seven triathletes undertook a cycling graded exercise test to exhaustion, an isolated 500-kJ cycle time trial (CTT) and an isolated 5-km running time trial. Then they performe...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-010-1547-y
更新日期:2010-11-01 00:00:00
abstract::A mathematical description of the regulation of ATP production in muscle cells is presented whereby the activity of OxP can be calculated as a function of (1) free [ADP] as the substrate and (2) a second driving force PhiDelta G (kilojoules per mole) resulting from the difference of free energy Delta G(ox,ap) (kilojou...
journal_title:European journal of applied physiology
pub_type: 杂志文章,评审
doi:10.1007/s00421-002-0676-3
更新日期:2003-01-01 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::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::Non-steroidal anti-inflammatory drugs (NSAIDs) are widely consumed in relation to pain and injuries in skeletal muscle, but may adversely affect muscle adaptation probably via inhibition of prostaglandin synthesis. Induction of heat shock proteins (HSP) represents an important adaptive response in muscle subjected to ...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-013-2606-y
更新日期:2013-07-01 00:00:00
abstract::Cooling of a muscle has a detrimental effect on its force, power and contraction velocity, but may improve force control during precision movements by reducing physiological tremor. We investigated if the contractile characteristics of the first dorsal interosseus muscle (FDI) were linked to voluntary force control in...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-003-0938-8
更新日期:2004-01-01 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::Falls from heights resulting from a loss of balance are a major concern in the occupational setting. Previous studies have documented a deleterious effect of lower extremity fatigue on balance. The purpose of this study was to investigate the effect of lumbar extensor fatigue on balance during quiet standing. Addition...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s00421-004-1195-1
更新日期:2004-10-01 00:00:00
abstract:PURPOSE:The aim of this study was to determine the effects of high-intensity aerobic interval training (AIT) on exercise hemodynamics in metabolic syndrome (MetS) volunteers. METHODS:Thirty-eight, MetS participants were randomly assigned to a training (TRAIN) or to a non-training control (CONT) group. TRAIN consisted ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-017-3697-7
更新日期:2017-10-01 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:PURPOSE:To compare cardiometabolic responses to five consecutive days of daily postprandial exercise accumulated in three 10-min bouts or a single 30-min bout to a no-exercise control. METHODS:Ten insufficiently active adults completed three trials in a randomised order. Each trial comprised five consecutive days of 3...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-020-04461-y
更新日期:2020-11-01 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::We investigated the alteration in flow-dependent-dilatation in the orthostatic intolerance occurring after bed-rest deconditioning. Eight men [aged mean (SEM) 32 (2) years] underwent two consecutive periods of 7 days of head-down-tilt (HDT, -6 degrees) during bed rest. A control age and sex matched group [n = 8, 30 (2...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s004210100483
更新日期:2001-09-01 00:00:00
abstract::Ten subjects suffering from incomplete spinal cord injuries, clinically diagnosed as walking with Trendelenburg gait, underwent a 2 month therapy program to strengthen their muscles and reduce their gait abnormalities. Therapy involved muscle strengthening and gait training for 2 h a day, 5 days a week in a clinic. Bi...
journal_title:European journal of applied physiology
pub_type: 临床试验,杂志文章
doi:10.1007/s004210100466
更新日期:2001-09-01 00:00:00
abstract::Since playing wind instrument impedes normal respiratory functions, its effect on expiratory and blood gases as well as on cardiac function was investigated. In 15 skilled clarinettists expiratory PO(2) and PCO(2) were measured in gas drawn from a modified clarinet barrel when playing a composition (Robert Schumann's ...
journal_title:European journal of applied physiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00421-010-1576-6
更新日期:2010-12-01 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::The present study examined the effects of raising both skin temperature and core temperature, separately and in combination, on perceptions of heat-related fatigue (alertness, contentment, calmness and thermal comfort), cardiovascular function and on objective measures of cognitive performance (reaction time and accur...
journal_title:European journal of applied physiology
pub_type: 杂志文章
doi:10.1007/s00421-008-0677-y
更新日期:2008-09-01 00:00:00