Abstract:
:The interrelationships between axonal conduction velocity, tetanic tension, twitch contraction time and rate of force development during a tetanus have been studied in 126 motor units from 12 cat medial gastrocnemius muscles. While the range of axonal conduction velocities for slow- (contraction time greater than 45 msec) and fast-twitch units overlapped, the mean conduction velocity for the slow-twitch group was significantly lower. No difference could be found between the axonal conduction velocities of the fast non-fatiguing and fast fatiguing units. Within individual experiments, few significant correlations were found between conduction velocity and tetanic tension or contraction time for the fast- and slow-twitch units. Some correlations did appear when data from these populations were pooled, but such results are shown to be misleading. Some weak correlations were found between motor unit contraction strength and twitch contraction time. The rate of rise of isometric force development was found to be most strongly related to tetanic tension and only weakly related to contraction time. The ordering of motor units according to contraction strength reveals the association of motor unit mechnical properties to be ideally suited for the dual role of medial gastrocnemius as a postural and powerful phasic muscle.
journal_name
Brain Resjournal_title
Brain researchauthors
Stephens JA,Stuart DGdoi
10.1016/0006-8993(75)90542-9subject
Has Abstractpub_date
1975-06-27 00:00:00pages
177-95issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(75)90542-9journal_volume
91pub_type
杂志文章相关文献
BRAIN RESEARCH文献大全abstract::In the present study, we investigated the co-localization pattern of the delta subunit with other subunits of GABA(A) receptors in the rat brain using immunoprecipitation and Western blotting techniques. Furthermore, we investigated whether low concentrations of ethanol affect the delta-subunit-containing GABA(A) rece...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2007.06.051
更新日期:2007-08-24 00:00:00
abstract::This study examines the preventive and therapeutic effects of curcumin on brain edema after hypoxic-ischemic brain damage (HIBD) in a rat model. Male Sprague-Dawley rats were divided into four groups: a sham group (SH), a hypoxic-ischemic group (HI) without drug treatment, a hypoxic-ischemic group (CU) with curcumin i...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2012.07.055
更新日期:2012-09-26 00:00:00
abstract::In normal adult cats we measured the density of staining for the activity of succinate dehydrogenase (SDH staining) in ventral horn cells of different sizes. The measurements were restricted to that part of the lumbar ventral horn (L6-L7) which is known to contain motoneurones of the peroneal nerve. A statistically si...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(86)91542-8
更新日期:1986-10-15 00:00:00
abstract::To understand the role of hypothalamic dopamine in thermoregulation, single unit activity was recorded in vitro, from constantly perfused tissue slices of rat preoptic area and anterior hypothalamus, PO/AH. The firing rate and thermosensitivity of individual PO/AH neurons were determined before, during and after tissu...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(84)90364-0
更新日期:1984-07-23 00:00:00
abstract::DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane] is a potent neurotoxicant in both vertebrate and invertebrate species. We have previously reported that neonatal exposure to DDT affects the muscarinic cholinergic receptors (MAChR) in the cerebral cortex in the neonatal mouse, leading to permanent disturbances in th...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)90144-x
更新日期:1992-06-12 00:00:00
abstract::Previous studies have shown that preganglionic nerve stimulation in vitro increases acutely the activity of tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamine biosynthesis, in sympathetic neuronal cell bodies in the rat superior cervical ganglion (SCG). In the present study, we have examined whether ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(90)90506-7
更新日期:1990-07-30 00:00:00
abstract::Prenatal exposure to opiates, which is invariably followed by postnatal withdrawal, can affect cognitive performance. To further characterize these effects, we examined radial 8-arm maze performance and expression of brain derived neurotrophic factor (BDNF) in male rats prenatally exposed to the opiate l-alpha-acetylm...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.01.020
更新日期:2008-03-10 00:00:00
abstract::After traumatic brain injury, extracellular K(+) in brain can dramatically increase. We studied the effects of increased K(+) on the isolated pressurized rat middle cerebral artery (MCA). MCAs (200-250 microm OD) were isolated, cannulated with glass micropipettes, and pressurized. K(+) was increased in the extralumina...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(00)02793-1
更新日期:2000-10-13 00:00:00
abstract::Vasopressin generates a voltage-gated, sodium-dependent current in facial motoneurons in brainstem slices. Reducing the extracellular calcium concentration from 2 to 0.01 mM caused a 30 to 120% increase in the amplitude of this current. Lowering extracellular magnesium also enhanced it, but less efficiently. In the ph...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)90097-7
更新日期:1993-10-08 00:00:00
abstract::Previous studies focusing on the relationship between lateralization of language function and age suffer from lack of a balanced distribution of age and handedness among participants, especially in the extremes of age. This limits our understanding of the influence of these factors on lateralization of language circui...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2017.08.021
更新日期:2017-11-01 00:00:00
abstract::In the present research the role of gender in MDMA-induced hyperthermia and serotonin depletion is studied by injecting male and female male rats with MDMA or saline 3 times (i.p.) with 3h interval at dosages of 0.3, 1, 3 or 9 mg/kg at an ambient temperature of 25°C. The acute hyperthermia following the higher dosages...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2011.04.039
更新日期:2011-06-29 00:00:00
abstract::Odor stimulation of the nose in the box turtle and the gopher tortoise produced a characteristic series of slow potentials in the olfactory bulb which were referred to as the odor evoked response. When recorded with direct coupling, the odor evoked response had 3 components: wave I, a short duration monophasic event; ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(75)90914-2
更新日期:1975-10-24 00:00:00
abstract::Activation of phospholipase C (PLC) coupled to phosphoinositide (PtdIns) hydrolysis occurs through one of the two pathways. One of the major pathways for the neurotransmitter signaling involves phosphoinositide (PtdIns) specific and G-protein dependent PLC-beta, which stimulates the formation of inositol triphosphate ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(95)01272-9
更新日期:1996-02-05 00:00:00
abstract::ERPs were acquired in the test phases of three memory experiments, where three classes of word were presented. These were: (i) words encountered in a prior study phase (studied words), (ii) words presented at test for the first time (new words), and (iii) new words repeated after a lag of 7-9 intervening words (repeat...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.07.095
更新日期:2006-10-09 00:00:00
abstract::Cerebral amyloid angiopathy (CAA) might disturb the sensitive mechanism of cerebral pressure autoregulation. This study examines whether dynamic cerebral autoregulation (CA) is impaired in the posterior or anterior circulation of CAA patients. Fifteen patients with known CAA on magnetic resonance imaging (MRI) and 14 ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2019.04.014
更新日期:2019-08-15 00:00:00
abstract::Intake of an unconditionally preferred taste stimulus (e.g., saccharin) is reduced by contingent administration of a drug of abuse (e.g., morphine). We examined the influence of insular cortex (IC) lesions on morphine-induced suppression of an olfactory cue and two taste stimuli with different levels of perceived inna...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2009.07.033
更新日期:2009-10-06 00:00:00
abstract::The organization of the wing component of the dorsal column-medial lemniscal pathway, and somatosensory projections from the thalamus to the Wulst, are described for an oscine member of the major group of birds, the Passeriformes. Wing primary afferents terminate throughout the cervical spinal cord, but between the br...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)00253-9
更新日期:1997-06-06 00:00:00
abstract::Mounting evidence suggests that sleep loss negatively affects learning and memory processes through disruption of hippocampal function. In the present study, we examined whether sleep loss alters the generation, differentiation, and survival of new cells in the dentate gyrus. Rats were sleep restricted by keeping them...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2005.10.020
更新日期:2005-12-14 00:00:00
abstract::Previous studies have suggested that substance P (SP) plays a critical role in the development of brain oedema and functional deficits following traumatic brain injury and that SP receptor antagonism may improve outcome. No studies have described such a role in ischemic stroke. The present study characterized the effe...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2011.03.066
更新日期:2011-06-01 00:00:00
abstract::The morphological features and distribution of luteinizing hormone-releasing hormone (LHRH)-immunoreactive cell bodies and fibers of the hypothalamic and the neighboring mesencephalic regions were studied in the normal newborn infant by immunohistochemistry. Within the hypothalamus, numerous LHRH-immunoreactive like (...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(90)90929-6
更新日期:1990-05-21 00:00:00
abstract::Prefrontal impairments have been hypothesized to be most strongly associated with the cognitive and emotional dysfunction in depression. Recently, white matter microstructural abnormalities in prefrontal lobe have been reported in elderly patients with major depressive disorder (MDD) using diffusion tensor imaging (DT...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2007.06.094
更新日期:2007-09-07 00:00:00
abstract::Development of noradrenergic responses in the rat dorsal motor nucleus of the vagus (DMV) from postnatal days 0 to 22 was studied by a conventional microelectrode technique using brain slice preparations. Between postnatal days 0 and 6, noradrenaline (NA) caused only alpha 1-adrenoceptor-mediated depolarizations. By p...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(89)91170-0
更新日期:1989-07-31 00:00:00
abstract::Neurokinin A and B (NKA and NKB) and neuropeptide K (NPK) were recently isolated from porcine spinal cord and brain, and together with substance P (SP) considerably extend the list of tachykinin-like peptides present in the mammalian nervous system. In order to investigate the distribution of tachykinins in the centra...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(86)91514-3
更新日期:1986-12-10 00:00:00
abstract::Previous research suggests that the prelimbic subregion of the medial prefrontal cortex (mPFC) is necessary for acquisition of cocaine-conditioned place preference (CPP). Recently, it has been shown that extinguished cocaine-CPP can be reinstated by cocaine priming injections, and that this effect reflects the incenti...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(03)03452-8
更新日期:2003-11-14 00:00:00
abstract::Mechanisms regulating sexual differentiation of the zebra finch song system appear to include both genetic and hormonal factors. Sorting Nexin 2 (SNX2), which is involved in trafficking proteins between cellular membranes, and androgen receptor (AR) mRNA are both increased in song control nuclei of juvenile males comp...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2010.04.084
更新日期:2010-07-09 00:00:00
abstract::The role of the lateral parabrachial area (lPB) in the acquisition of a delayed taste aversion learning task (TAL) was examined by delivering the peripherally acting aversive compound, methylscopolamine (MSP), through two different routes, intraperitoneal and intraventricular. Consistent with previous anatomical, beha...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(00)02453-7
更新日期:2000-07-14 00:00:00
abstract::Purkinje cells are the sole output from the cerebellar cortex and play a critical role during classical eyeblink conditioning. The present study revealed for the first time a learning-related change in individual Purkinje cell activity during successive eyeblink conditioning in decerebrate guinea pigs which permitted ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2005.10.090
更新日期:2006-01-12 00:00:00
abstract::Adenosine receptor antagonists, DMPX, PACPX and theophylline, produce contralateral rotations in unilateral 6-hydroxydopamine-lesioned rats. DMPX and theophylline markedly increase rotations produced by bromocriptine (a dopamine D2 receptor agonist) and/or SKF38393A (a dopamine D1 receptor agonist). All of these effec...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)90925-d
更新日期:1993-06-11 00:00:00
abstract::The activity of the crayfish caudal photoreceptor (Ph) was studied during the application of a classical conditioning paradigm. This cell is a primary photoreceptor and, at the same time, a secondary neuron in the mechanoreceptive pathway. The electrical stimulation of afferent mechanoreceptor fibers, the analog of th...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(77)90946-5
更新日期:1977-04-01 00:00:00
abstract::Recent experimental data have shown that hyperbaric oxygen therapy (HBOT) was associated increased Bcl-2 expression at the injury site that correlated with reduced apoptosis. We hypothesized that HBOT mediated enhancement of Bcl-2 expression and increased intracellular oxygen bio-availability may both contribute to pr...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.04.078
更新日期:2008-07-24 00:00:00