Abstract：
:Intramuscular and surface electromyographic (EMG) activities were recorded from the left and right upper trapezius muscle of eight healthy male subjects during 5-min long static contractions at 2% and 5% of the maximal voluntary contraction (MVC) force. Intramuscular signals were detected by wire electrodes while surface EMG signals were recorded with linear adhesive electrode arrays. The surface EMG signals were averaged using the potentials extracted from the intramuscular EMG decomposition as triggers. The conduction velocity of single motor units (MUs) was estimated over time from the averaged surface potentials while average rectified value and mean power spectral frequency were computed over time from 0.5 s epochs of surface EMG signal. It was found that (1) MUs were progressively recruited after the beginning of sustained contractions of the upper trapezius muscle at 2% and 5% MVC, (2) the conduction velocity of the MUs active since the beginning of the contraction significantly decreased over time, and (3) although the CV of single MUs significantly decreased, the mean power spectral frequency of the surface EMG did not show a consistent trend over time. It was concluded that spectral surface EMG analysis, being affected by many physiological mechanisms, may show limitations for the objective assessment of localized muscle fatigue during low force, sustained contractions. On the contrary, single motor unit conduction velocity may provide an early indication of changes in muscle fiber membrane properties with sustained activity.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Farina D,Zennaro D,Pozzo M,Merletti R,Läubli Tdoi
10.1007/s00421-004-1261-8keywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
157-64issue
2eissn
1439-6319issn
1439-6327journal_volume
96pub_type
杂志文章abstract：:This study investigated the hypothesis that the duration of aerobic-based cycle exercise would affect the adaptations in substrate and metabolic regulation that occur in vastus lateralis in response to a short-term (10 day) training program. Healthy active but untrained males (n = 7) with a peak aerobic power ([Formul...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-012-2434-5
更新日期：2013-02-01 00:00:00
abstract：:The aim of this study was to examine the influence of the performance level of athletes on pacing strategy during a simulated 10-km running race, and the relationship between physiological variables and pacing strategy. Twenty-four male runners performed an incremental exercise test on a treadmill, three 6-min bouts o...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-009-1300-6
更新日期：2010-03-01 00:00:00
abstract：PURPOSE:The aim of this study was to compare the muscle oxygenation between trained and untrained subjects during heavy exercise until exhaustion at two extreme pedaling cadences using a NIRS system. METHODS:Nine untrained male subjects and nine male competitive triathletes cycled until exhaustion at an intensity corr...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-015-3235-4
更新日期：2015-12-01 00:00:00
abstract：:Triglyceride-rich postprandial lipoproteins are known to activate endothelial cells in vitro, contributing to atherosclerosis. Endothelial microparticles (EMP) are membranous vesicles released into the circulation from vascular endothelial cells that permit cell activation to be monitored in vivo. The objective of the...
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
doi：10.1007/s00421-009-1050-5
更新日期：2009-07-01 00:00:00
abstract：PURPOSE:The effectiveness of exercise to lower blood pressure may depend on the type and intensity of exercise. We study the short-term (i.e., 14-h) effects of a bout of high-intensity aerobic interval training (HIIT) on blood pressure in metabolic syndrome (MetS) patients. METHODS:Nineteen MetS patients (55.2 ± 7.3 y...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-017-3631-z
更新日期：2017-07-01 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：: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：:A common null polymorphism (rs1815739; R577X) in the gene that codes for α-actinin-3 (ACTN3) has been related to different aspects of exercise performance. Individuals who are homozygous for the X allele are unable to express the α-actinin-3 protein in the muscle as opposed to those with the RX or RR genotype. α-actin...
journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
doi：10.1007/s00421-018-4010-0
更新日期：2019-01-01 00:00:00
abstract：:Exercise improves high-fat diet (HFD)-induced skeletal muscle insulin resistance, but the mechanism is unresolved. This study aims to explore whether the improvement in response to exercise is associated with mTOR/S6K1 signaling and whether the signaling changes are muscle-specific. Male SD rats (150-180 g) were used ...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-011-1892-5
更新日期：2011-11-01 00:00:00
abstract：:We have previously demonstrated that, ACE D allele may be related with a better performance in short duration aerobic endurance in a homogeneous cohort with similar training backgrounds. We aimed to study the variation in the short-duration aerobic performance development amongst ACE genotypes in response to identical...
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
doi：10.1007/s00421-006-0286-6
更新日期：2006-11-01 00:00:00
abstract：:This study examined the effects of intensive, moderate and downhill treadmill running on blood lymphocyte expression of adhesion/activation (AA) molecules. Trained subjects completed three treadmill-running protocols of identical duration: (1) an intensive protocol at 80% VO2max to volitional exhaustion, (2) a moderat...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-006-0146-4
更新日期：2006-05-01 00:00:00
abstract：:In adults, exercise is a powerful and natural stimulator of immune cells and adhesion molecules. Far less is known about these exercise responses during childhood and whether or not exercise in real-life activities of healthy children might influence immune responses. We compared laboratory exercise (10 x 2 min period...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s004210100505
更新日期：2001-11-01 00:00:00
abstract：:Trends in industry are leaning toward stereotyped jobs with low workloads. Physical variation is an intervention to reduce fatigue and potentially musculoskeletal disorders in such jobs. Controlled laboratory studies have provided some insight into the effectiveness of physical variation, but very few have been devote...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-012-2375-z
更新日期：2012-11-01 00:00:00
abstract：:Forearm pain occurring during high +Gz exposure has been linked with vascular distension from elevated transmural pressure of hydrostatic origin and is exacerbated by positive pressure breathing (PBG). We postulated that at high vascular transmural pressure vascular autoregulation might be overcome and be associated w...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-007-0465-0
更新日期：2007-08-01 00:00:00
abstract：PURPOSE:To examine the effects of caffeine ingestion on physiological and perceptual responses in mentally fatigued individuals. METHODS:Eight male physically active subjects completed four cycling constant-workload tests in four experimental conditions at 80 % of maximal power output: control (C), mental fatigue (MF)...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-016-3483-y
更新日期：2016-12-01 00:00:00
abstract：PURPOSE:The aim of this study was to compare the efficacy of three water immersion interventions performed after active recovery compared to active recovery only on the resolution of inflammation and markers of muscle damage post-exercise. METHODS:Nine physically active men (n = 9; age 20‒35 years) performed an intens...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-020-04481-8
更新日期：2020-12-01 00:00:00
abstract：:Differences in physiological functioning in the hypothalamus-pituitary-adrenal cortex axis and the autonomic nervous system have been suggested to contribute to many of the health differences that may be observed between men and women as well as being relevant for the development of musculoskeletal pain. To clarify wh...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-008-0939-8
更新日期：2009-03-01 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：:Testosterone and cortisol respond to exercise stimuli and modulate adaptation. Episodic basal secretion of these hormones may modify the responsiveness of these hormones. We sought to identify episodic steroid secretion via frequent salivary sampling and investigate any interaction between ultradian rhythmicity and in...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-010-1518-3
更新日期：2010-09-01 00:00:00
abstract：:The aim of this study was to use the rat moderate spinal cord contusion model to investigate the effects of incomplete spinal cord injury (SCI) on the muscle regeneration process, comparing regeneration of slow-twitch plantarflexor soleus muscle and fast-twitch dorsiflexor tibialis anterior (TA) muscle. Additionally, ...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-012-2429-2
更新日期：2013-01-01 00:00:00
abstract：PURPOSE:The aims of this study were to: (1) determine the relationships between maximum oxygen uptake ([Formula: see text]O2max) and walking economy during non-graded and graded walking among overweight women and (2) examine potential differences in [Formula: see text]O2max and walking economy before and after weight l...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-018-3888-x
更新日期：2018-08-01 00:00:00
abstract：:In order to test our hypothesis that muscle condition has an effect on the cognition of self-motion and consequently on the ventilatory response during exercise, six healthy subjects performed a moderate incremental exercise test (IET) on a cycle ergometer under two conditions [resistance exercise condition (REC) and ...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-010-1801-3
更新日期：2011-08-01 00:00:00
abstract：PURPOSE:This study tested the hypothesis that a novel, audio-visual-directed, home-based exercise training intervention would be effective at improving cardiometabolic health and mental well-being in inactive premenopausal women. METHODS:Twenty-four inactive premenopausal women (39 ± 10 years) were randomly assigned t...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-020-04315-7
更新日期：2020-04-01 00:00:00
abstract：:We investigated the effect of increases in muscle afferent information from the shoulder girdle elevators on saccadic reaction time. Saccadic reaction time was measured under conditions of isometric voluntary contraction of the shoulder girdle elevators and vibratory stimulation of the trapezius. Saccadic reaction tim...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s004210100509
更新日期：2001-10-01 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：:Several regulatory mechanisms have been proposed for the exercise hyperemia in skeletal muscles. Since different vasoactive factors might interact during the hyperemic response, we investigated the influence of elevated K(+) concentrations on hyperosmolarity (HO)-induced vasorelaxations. Small gluteal rat arteries wer...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-005-0128-y
更新日期：2006-04-01 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：:We hypothesized that impaired cardiovascular responses to isometric muscle action contribute to the cardiovascular deconditioning that occurs after space flight (SF) and head-down-tilt bed rest (HDT). Six subjects were studied before, during and after 120 days of -6 degrees HDT, and four subjects were studied before, ...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s004210100429
更新日期：2001-07-01 00:00:00
abstract：:In order to quantify the seasonal variability of haemoglobin mass (Hb(mass)) in cyclists during a competitive season, and investigate whether variability is associated with changes in training load or performance, Hb(mass) was measured in 10 internationally competitive female road cyclists approximately once per month...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-009-1349-2
更新日期：2010-05-01 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
