Abstract：
INTRODUCTION:To investigate potential differences in the recruitment order of motor units (MUs) in the quadriceps femoris when electrical stimulation is applied over the quadriceps belly versus the femoral nerve. METHODS:M-waves and mechanical twitches were evoked using femoral nerve stimulation and direct quadriceps stimulation of gradually increasing intensity from 20 young, healthy subjects. Recruitment order was investigated by analysing the time-to-peak twitch and the time interval from the stimulus artefact to the M-wave positive peak (M-wave latency) for the vastus medialis (VM) and vastus lateralis (VL) muscles. RESULTS:During femoral nerve stimulation, time-to-peak twitch and M-wave latency decreased consistently (P < 0.05) with increasing stimulus intensity, whereas, during graded direct quadriceps stimulation, time-to-peak twitch and VL M-wave latency did not show a clear trend (P > 0.05). For the VM muscle, M-wave latency decreased with increasing stimulation level for both femoral nerve and direct quadriceps stimulation, whereas, for the VL muscle, the variation of M-wave latency with stimulus intensity was different for the two stimulation geometries (P < 0.05). CONCLUSIONS:Femoral nerve stimulation activated MUs according to the size principle, whereas the recruitment order during direct quadriceps stimulation was more complex, depending ultimately on the architecture of the peripheral nerve and its terminal branches below the stimulating electrodes for each muscle. For the VM, MUs were orderly recruited for both stimulation geometries, whereas, for the VL muscle, MUs were orderly recruited for femoral nerve stimulation, but followed no particular order for direct quadriceps stimulation.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Rodriguez-Falces J,Place Ndoi
10.1007/s00421-013-2736-2subject
Has Abstractpub_date
2013-12-01 00:00:00pages
3069-77issue
12eissn
1439-6319issn
1439-6327journal_volume
113pub_type
杂志文章abstract：PURPOSE:Prolonged static stretching (SS) in isolation (no dynamic warm-up) can impair muscle performance. There are conflicting reports whether impairments are present in antagonist and contralateral muscles. The objective of this study was to assess the effect of unilateral hamstrings SS on ipsilateral stretched and c...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-019-04182-x
更新日期：2019-09-01 00:00:00
abstract：:Mechanical loading of cells induces the expression of transforming growth factor-beta-1, and acute exercise, which involves mechanical loading of several tissues, could thus increase its circulating level in humans. However, no consensus exists regarding the plasma concentration of this cytokine in resting subjects (r...
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
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更新日期：2003-09-01 00:00:00
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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
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journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：2004-05-01 00:00:00
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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：:The purpose of this study was to determine whether sweat sodium concentration ([Na(+)](sweat)) during exercise in the heat differs between aerobically trained and untrained individuals. On three occasions, ten endurance-trained (Tr) and ten untrained (UTr) subjects (VO2peak = 4.0 ± 0.8 vs. 3.4 ± 0.7 L min(-1), respect...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-011-1911-6
更新日期：2011-11-01 00:00:00
abstract：:Both physical as well as mental demands result in an increased activity in the sympathetic nervous system (SNS) with changes in blood-pressure and heart-rate. Through local release of catecholamines, e.g. noradrenaline (NAd) SNS exerts various actions at the muscle level. The aims of this study were to investigate the...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-009-1095-5
更新日期：2009-09-01 00:00:00
abstract：:Sixteen male students exercised for 14 days (1 h/day) in the heat for heat acclimation (HA). During deacclimation (DA) one group exercised in the cold (EXG, n=8) for 60 min/day (morning) and was exposed to the cold for another hour (afternoon) for 14 days. The other group was exposed to the cold (EPG, n=8) for 1 h eac...
journal_title：European journal of applied physiology
pub_type： 杂志文章
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更新日期：2005-10-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-010-1560-1
更新日期：2010-11-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-006-0189-6
更新日期：2006-07-01 00:00:00
abstract：:Based on studies using maximal isometric contractions, it is suggested that fatigue may be elicited due to hyperthermia-induced impairments in central neuromuscular activation. We investigated the effects of passive hyperthermia on isokinetic maximal force production. Twenty young healthy males [peak oxygen uptake 52....
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
doi：10.1007/s00421-004-1062-0
更新日期：2004-05-01 00:00:00
abstract：:Physical inactivity in response to a spinal cord injury (SCI) represents a potent stimulus for conduit artery remodelling. Changes in conduit artery characteristics may be induced by the local effects of denervation (and consequent extreme inactivity below the level of the lesion), and also by systemic adaptations due...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-012-2400-2
更新日期：2012-12-01 00:00:00
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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
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journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：2003-01-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-008-0855-y
更新日期：2008-12-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-017-3543-y
更新日期：2017-03-01 00:00:00
abstract：:To examine the effects of thermal stress on the blood pressure variability and the arterial baroreceptor-cardiac reflex during orthostatic stress, 11 male volunteers underwent whole body thermal stress using a cool or hot water-perfused suit during 5 min of 70 degrees head-up tilt (HUT). The spontaneous variability in...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s004210100387
更新日期：2001-04-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-011-2305-5
更新日期：2012-09-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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更新日期：2006-04-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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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
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-019-04201-x
更新日期：2019-10-01 00:00:00
abstract：:The present investigation has been designed to confirm the effect of instruction (hard-and-fast instruction compared to fast instruction) upon maximal voluntary isometric force (MVF) and maximal rate of force development (MRFD) in muscle groups which differ with regards to muscle mass and usage. In addition, we took a...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s004210100451
更新日期：2001-08-01 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
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-013-2637-4
更新日期：2013-08-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-010-1699-9
更新日期：2011-05-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
doi：10.1007/s00421-017-3591-3
更新日期：2017-06-01 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：:The purpose of the present article is to identify the most appropriate method of scaling VO2max for differences in body mass when assessing the energy cost of time-trial cycling. The data from three time-trial cycling studies were analysed (N = 79) using a proportional power-function ANCOVA model. The maximum oxygen u...
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
doi：10.1007/s00421-005-1321-8
更新日期：2005-08-01 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
