Quantitative analysis of jaw and hyolingual muscle activity during feeding in the lizard Agama stellio

1997 ◽  
Vol 200 (1) ◽  
pp. 101-115 ◽  
Author(s):  
A Herrel ◽  
J Cleuren ◽  
F Vree
Keyword(s):  
Quantitative Analysis ◽  
Prey Capture ◽  
Activity Patterns ◽  
Power Stroke ◽  
Special Focus ◽  
Motor Patterns ◽  
Related Data ◽  
Adductor Muscles ◽  
Feeding Cycle ◽  
Kinematic Analyses

The activity of jaw and hyolingual muscles during the entire feeding sequence is examined in the lizard Agama stellio, with special focus on the intraoral transport and swallowing stages. Correlation of electromyography (EMG) data with kinematics shows that the kinematic phases (slow opening, SO; fast opening, FO; fast closing, FC; slow closing/power stroke, SC/PS) are characterised by distinct activities in the jaw and hyolingual muscles. The SO phase is clearly the result of tongue protraction (upon protraction, the tongue is pulled against the prey and consequently the lower jaw is pushed down), whereas the FO phase is caused by activity in the jaw opener and dorsal cervical muscles. Both the FC and SC/PS phases are characterised by pronounced activity in the jaw adductor muscles. Tongue retraction is produced by activity in the hyoid and tongue retractor muscles. A quantitative analysis of time-related EMG data shows that, in accordance with the kinematic analyses, three different stages can be recognised as components of the feeding cycle: prey capture, intraoral transport and swallowing. However, analysis of intensity-related data allowed a fourth stage, crushing, to be detected. Whereas there are indications that prey capture, intraoral transport and swallowing are controlled by different motor patterns, the differences between crushing and transport are likely to be caused by feedback mechanisms. Our results show the importance of including intensity-related data in quantitative analyses of EMG recordings in order to discriminate between feeding stages. Additionally, it is shown that both the jaw and the hyolingual muscles play crucial roles during feeding. During all stages, movements of the hyolingual apparatus are an essential part of the feeding cycle. Thus, when examining lizard feeding mechanisms, the activity patterns of the hyolingual muscles should not be neglected.

scholarly journals COUPLED VERSUS UNCOUPLED FUNCTIONAL SYSTEMS: MOTOR PLASTICITY IN THE QUEEN TRIGGERFISH BALISTES VETULA

1993 ◽  
Vol 180 (1) ◽  
pp. 209-227 ◽  
Author(s):  
P. C. Wainwright ◽  
R. G. Turingan
Keyword(s):  
Muscle Activity ◽  
Prey Capture ◽  
Activity Patterns ◽  
Motor Pattern ◽  
Teleost Fishes ◽  
Suction Feeding ◽  
Motor Patterns ◽  
Jaw Apparatus ◽  
Adductor Muscles ◽  
Patterns Of Behavior

Teleost fishes typically capture prey with the oral jaws and perform most types of prey- processing behavior with the pharyngeal jaw apparatus. In these fishes, the motor patterns associated with the different stages of feeding are quite distinct, and fish can modify muscle activity patterns when feeding on different prey. We examined motor pattern variation in the queen triggerfish, Balistes vetula, a versatile predator that both captures and processes prey with its oral jaws. During feeding on three prey that differed in hardness and elusiveness, three distinct patterns of behavior could be identified on the basis of patterns of muscle activity: prey capture, buccal manipulation and blowing. During prey capture by suction feeding, the retractor arcus palatini muscle (RAP) commenced activity before the levator operculi muscle (LOP). In both buccal manipulation and blowing, the RAP began activity well after the onset of activity in the LOP. Both prey capture and buccal manipulation motor patterns varied when fish fed on different prey. When capturing hard-shelled and non-elusive prey, B. vetula did not employ suction feeding but, instead, the fish directly bit parts of its prey. The motor pattern exhibited during direct biting to capture prey was different from that during suction feeding, but was indistinguishable from the pattern seen during the repeated cycles of buccal manipulation. Harder prey elicited significantly longer bursts of activity in the jaw adductor muscles than did soft prey. In spite of the involvement of the oral jaws in virtually all stages of feeding, B. vetula shows levels of variation between patterns of behavior and types of prey characteristic of previously studied teleost fishes. Thus, the coupling of capture and processing behavior patterns in the repertoire of the oral jaws does not appear to constrain the behavioral versatility of this species.

scholarly journals SAT0306 SEMIQUANTITATIVE AND QUANTITATIVE ANALYSIS OF LUNG CT IN THE ASSESSMENT OF INTERSTITIAL LUNG DISEASE IN IDIOPATHIC INFLAMMATORY MYOPATHIES WITH A FOCUS ON ANTISYNTHETASE.

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 1098.2-1098
Author(s):  
S. Barsotti ◽  
C. Roncella ◽  
A. Valentini ◽  
L. Cavagna ◽  
R. Castellana ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Interstitial Lung Disease ◽  
Lung Disease ◽  
Special Focus ◽  
Idiopathic Inflammatory Myopathies ◽  
Inflammatory Myopathies ◽  
Increased Risk ◽  
Group 2 ◽  
Lung Ct ◽  
Group 1

Background:Interstitial lung disease (ILD), is common in patients with idiopathic inflammatory myopathies (IIM) and strongly impact on patients’ morbidity and mortality. Patients with anti-aminoacyl-transfer RNA-synthetases (anti-ARS) antibodies are associated with an increased risk of ILD.Objectives:Defining the radiological characteristics of IIM patients, with special focus on serological groups, through qualitative, semiquantitative and quantitative analysis of lung CT.Methods:This was a prospective study conducted from 2016 to 2019. Ninety-eight IIM patients (35 men, 63 women) were included. Myositis specific autoantibodies (MSA) were assessed with Myositis Prophyle III (Euroimmune, Lubeck).Each patient had a baseline CT; the total score of Warrick (WS) was obtained at semiquantitative analysis. The radiological scores ILD% (interstitial lung disease %) and PVRS% (pulmonary vascular related structure) were the result of quantitative analysis in 61 patients (CALIPER). Pulmonary function tests (PFTs) included TLC%, FVC% and DLCO% (65 patients). The analysis was conducted in the whole group and divided in subgroups based on their MSA pattern: in particular anti-ARS (Group 1) and patients negative to MSA (Group 2) were analysed.Results:Positive correlations between ILD% and PVRS% (Rho=0.916; ρ=0.000), WS and ILD% (Rho=0.663; ρ=0.000) and WS and PVRS% (Rho=0.637; ρ<0.001) were found.The most relevant inverse correlations were found between ILD% and DLCO% (Rho=-0.590; ρ=0.001), PVRS% and DLCO% (Rho=-0.549; ρ<0.001) and WS and DLCO% (Rho=-0.471; ρ<0.001).Statistically significant higher values of WS, ILD% and PVRS% were found in Group 1 (WS=15, ILD%=11 and PVRS%=3.5), compared to Group 2 (WS=2.5, ILD%=0.84 and PVRS%=2.2). NSIP pattern resulted dominant represented in the two groups (80% Group 1, 75% Group 2). No statistically significant differences of DLCO%, FVC% and TLCO% were found.Conclusion:The inverse correlations between the radiological scores and the functional data TLC% and DLCO% (ρ<0.001) confirm the role of lung CT in the clinical management of ILD in IIM patients, and may represent a promising tool for clinical trials. For the first time anti-ARS and serological negative patients were defined through qualitative, semiquantitative and quantitative analysis of lung CT. Further study should be conducted in order to define the prognostic value of the quantitative analysis of lung CT in the follow up of IIM patients.Disclosure of Interests:None declared

Forms of Forward Quadrupedal Locomotion. III. A Comparison of Posture, Hindlimb Kinematics, and Motor Patterns for Downslope and Level Walking

1998 ◽  
Vol 79 (4) ◽  
pp. 1702-1716 ◽  
Author(s):  
Judith L. Smith ◽  
Patricia Carlson-Kuhta ◽  
Tamara V. Trank
Keyword(s):  
Ankle Joint ◽  
Neural Control ◽  
Activity Patterns ◽  
Motor Patterns ◽  
Quadrupedal Locomotion ◽  
Hindlimb Muscles ◽  
Level Walking ◽  
Angular Displacements ◽  
External Forces ◽  
Hindlimb Kinematics

Smith, Judith L., Patricia Carlson-Kuhta, and Tamara V. Trank. Forms of forward quadrupedal locomotion. III. A comparison of posture, hindlimb kinematics, and motor patterns for downslope and level walking. J. Neurophysiol. 79: 1702–1716, 1998. To gain further insight into the neural mechanisms for different forms of quadrupedal walking, data on postural orientation, hindlimb kinematics, and motor patterns were assessed for four grades of downslope walking, from 25% (14° slope) to 100% (45°), and compared with data from level and downslope walking at five grades (5–25%) on the treadmill (0.6 m/s). Kinematic data were obtained by digitizing ciné film, and electromyograms (EMGs) synchronized with kinematic records were taken from 13 different hindlimb muscles. At grades from 25 to 75%, cycle periods were similar, but at the steepest grade the cycle was shorter because of a reduced stance phase. Paw-contact sequences at all grades were consistent with lateral-sequence walking, but pace walking often occurred at the steepest grades. The cats crouched at the steeper grades, and crouching was associated with changes in fore- and hindlimb orientation that were consistent with increasing braking forces and decreasing propulsive forces during stance. The average ranges of motion at the hindlimb joints, except at the hip, were often different at the two steepest slopes. During swing, the range of knee- and ankle-joint flexion decreased, and the range and duration of extension increased at the ankle joint to lower the paw downward for contact. During stance the range of flexion during yield increased at the ankle joint, and the range of extension decreased at the knee and metatarsophalangeal joints. Downslope walking was also associated with EMG changes for several muscles. The hip extensors were not active during stance; instead, hip flexors were active, presumably to slow the rate of hip extension. Although ankle extensors were active during stance, their burst durations were truncated and centered around paw contact. Ankle flexors were active after midstance at the steeper slopes before the need to initiate swing, whereas flexor and extensor digit muscles were coactive throughout stance. Overall the changes in posture, hindlimb kinematics, and activity patterns of hindlimb muscles during stance reflected a need to counteract external forces that would accelerate angular displacements at some joints. Implications of these changes are discussed by using current models for the neural control of walking.

SageBook: Toward a cross-generational social network for the Jewish sages’ prosopography

2018 ◽  
Vol 34 (3) ◽  
pp. 676-695
Author(s):  
Maayan Zhitomirsky-Geffet ◽  
Gila Prebor
Keyword(s):  
Social Network ◽  
Quantitative Analysis ◽  
Large Scale ◽  
Rabbinic Literature ◽  
Jewish Law ◽  
Related Data ◽  
Jewish Thought ◽  
Argumentation Analysis

Abstract In this research we devised and implemented a semi-automatic approach for building a SageBook–a cross-generational social network of the Jewish sages from the Rabbinic literature. The proposed methodology is based on a shallow argumentation analysis leading to detection of lexical–syntactic patterns which represent different relationships between the sages in the text. The method was successfully applied and evaluated on the corpus of the Mishna, the first written work of the Rabbinic Literature which provides the foundation to the Jewish law development. The constructed prosopographical database and the network generated from its data enable a large-scale quantitative analysis of the sages and their related data, and therefore might contribute to the research of the Talmudic literature and evolution of the Jewish thought throughout the two last millennia.

Spinal Cord Coordination of Hindlimb Movements in the Turtle: Intralimb Temporal Relationships During Scratching and Swimming

1997 ◽  
Vol 78 (3) ◽  
pp. 1394-1403 ◽  
Author(s):  
Edelle C. Field ◽  
Paul S. G. Stein
Keyword(s):  
Spinal Cord ◽  
Motor Neuron ◽  
Activity Patterns ◽  
Angular Position ◽  
Knee Extension ◽  
Neuron Activity ◽  
Spinal Circuitry ◽  
Temporal Relationships ◽  
Kinematic Analyses ◽  
Behavioral Event

Field, Edelle C. and Paul S. G. Stein. Spinal cord coordination of hindlimb movements in the turtle: intralimb temporal relationships during scratching and swimming. J. Neurophysiol. 78: 1394–1403, 1997. Spinal cord neuronal circuits generate motor neuron activity patterns responsible for rhythmic hindlimb behaviors such as scratching and swimming. Kinematic analyses of limb movements generated by this motor neuron output reveal important characteristics of these behaviors. Intralimb kinematics of the turtle hindlimb were characterized during five distinct rhythmic forms of behavior: three forms of scratching and two forms of swimming. In each movement cycle for each form, the angles of the hip and knee joints were measured as well as the timing of a behavioral event, e.g., rub onset in scratching or powerstroke onset in swimming. There were distinct differences between the kinematics of different forms of the same behavior, e.g., rostral scratch versus pocket scratch. In contrast, there were striking similarities between forms of different behaviors, e.g., rostral scratch versus forward swimming. For each form of behavior there was a characteristic angular position of the hip at the onset of each behavioral event (rub or powerstroke). The phase of the onset of knee extension within the hip position cycle occurred while the hip was flexing in the rostral scratch and forward swim and while the hip was extending in the pocket scratch, caudal scratch, and back-paddling form of swimming. The phase of the onset of the behavioral event was not statistically different between rostral scratch and forward swim; nor was it different between pocket scratch and caudal scratch. These observations of similarities at the movement level support the suggestion that further similarities, such as shared spinal circuitry, may be present at the neural circuitry level as well.

Quantitative analysis of feeding kinematics in dusky salamanders (Desmognathus)

1988 ◽  
Vol 66 (6) ◽  
pp. 1309-1317 ◽  
Author(s):  
John H. Larsen Jr. ◽  
John T. Beneski Jr.
Keyword(s):  
Quantitative Analysis ◽  
Prey Item ◽  
Prey Capture ◽  
Large Prey ◽  
Selective Force ◽  
Mandibular Symphysis ◽  
Lower Jaw ◽  
Feeding Kinematics

Gape formation by the dusky salamander (Desmognathus) involves both upper and lower jaws and occurs in a manner similar to that of other terrestrial salamanders. As Desmognathus opens its mouth, ventral rotation of the mandibles is restricted but not stopped by the atlas–mandibular ligaments; the lower jaw is not propelled anteriorly. Tongue protraction, well beyond the mandibular symphysis, is always a major component of prey capture by this genus. After the sticky tongue pad has made contact with the prey, the salamander's head surges forward and the pad is rapidly retracted with the prey item attached. Aided by a unique suite of characters the mouth then snaps shut with considerable force. Our study supports the premise that Desmognathus is no different from most, if not all, terrestrial salamanders in its employment of tongue projection as a major feature in prey capture. We argue that the primary selective force for the unique configuration of desmognathine cephalic structures was enhancement of the ability of these small salamanders to capture relatively large prey without an increase in the size of the head and body.

Modulation of the crayfish swimmeret rhythm by octopamine and the neuropeptide proctolin

1987 ◽  
Vol 58 (3) ◽  
pp. 584-597 ◽  
Author(s):  
B. Mulloney ◽  
L. D. Acevedo ◽  
A. G. Bradbury
Keyword(s):  
Spontaneous Activity ◽  
Motor Neurons ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Motor Pattern ◽  
Threshold Concentration ◽  
Power Stroke ◽  
Motor Patterns ◽  
Dose Dependent ◽  
Characteristic Motor

1. The swimmeret system can be excited by perfusing the neuropeptide proctolin through the isolated ventral nerve cord of the crayfish. Previously silent preparations begin to generate a characteristic motor pattern, the swimmeret rhythm, in the nerves that innervate the swimmerets. The response to proctolin is dose dependent and reversible. The threshold concentration of proctolin perfused through the ventral artery is approximately 10(-8) M. The EC50 is 1.6 X 10(-6) M. 2. Proctolin-induced motor patterns have periods and phases similar to those of spontaneously generated motor patterns. The durations of the bursts of impulses in power-stroke motor neurons generated in the presence of proctolin are, however, significantly longer than those that occur during spontaneous activity. 3. DL-Octopamine inhibits the swimmeret system, both when the system is spontaneously active and when it has been excited by proctolin. The inhibition by octopamine is dose dependent and reversible. The threshold for inhibition is approximately 10(-6) M, and the EC50 is approximately 5 X 10(-5) M. 4. Octopamine's effect is mimicked by its agonists, synephrine and norepinephrine. Synephrine has a lower threshold concentration than does octopamine, but norepinephrine is much less effective than octopamine. 5. Octopamine's inhibition is partially blocked by an antagonist, phentolamine. 6. Phentolamine also blocks inhibition of the swimmeret system by inhibitory command interneurons. This block is dose dependent and can be partially overcome by stimulating the command interneurons at higher frequencies. 7. Perfusion with 11 other suspected crustacean neurotransmitters and transmitter analogues did not similarly excite or inhibit the swimmeret system, so we suggest that proctolin and octopamine are transmitters used by the neurons that normally control expression of the swimmeret rhythm.

scholarly journals Risk Factors for Physical Inactivity Among Children With and Without Asthma Living in Peri-Urban Communities of Lima, Peru

2020 ◽  
Vol 17 (8) ◽  
pp. 816-822
Author(s):  
Sathvik Namburar ◽  
William Checkley ◽  
Oscar Flores-Flores ◽  
Karina M. Romero ◽  
Katherine Tomaino Fraser ◽  
...  
Keyword(s):  
Physical Activity ◽  
Risk Factors ◽  
Urban Communities ◽  
Physical Inactivity ◽  
Activity Patterns ◽  
Special Focus ◽  
Activity Levels ◽  
Physical Activity Levels ◽  
Steps Per Day ◽  
Demographic Risk

Background: The authors sought to examine physical activity patterns among children with and without asthma in 2 peri-urban communities in Lima, Peru, to identify socioeconomic and demographic risk factors for physical inactivity and examine the relationship between asthma and physical activity. Methods: The authors measured mean steps per day in 114 children (49 with asthma and 65 without) using pedometers worn over a 1-week period. They also used the 3-day physical activity recall to determine the most common activities carried out by children. Results: The authors found that 84.2% of the children did not meet the daily international physical activity recommendations. Girls took significantly fewer mean steps per day as compared with boys (2258 fewer steps, 95% confidence interval, 1042–3474), but no other factors, including asthma status, showed significant differences in the mean daily steps. Mean daily steps were positively associated with higher socioeconomic status among girls, and current asthma had a larger inverse effect on daily steps in boys when compared with girls. Conclusion: Physical activity levels were below recommended guidelines in all children. There is a need for policy and neighborhood-level interventions to address low physical activity levels among Peruvian youth. Special focus should be given to increasing the physical activity levels in girls.

scholarly journals Impact of Microcredit on Living Standard of Dairy Entrepreneurs: Special Focus on Oddusuddan DS Division in Mullaitivu District

2019 ◽  
Vol 3 (2) ◽  
pp. 43-48
Author(s):  
Saseela Balagobei ◽  
Sankeetha Aravinthakumar
Keyword(s):  
Quantitative Analysis ◽  
Low Income ◽  
Rural Areas ◽  
Positive Impact ◽  
Primary Data ◽  
Living Standard ◽  
Poor People ◽  
Special Focus ◽  
The Impact ◽  
Micro Credit

Microcredit is part of micro finance, which provides a wider range of financial services for low income people. Micro credit serves as a vital role for Living standard of poor people in the developing countries as well as in Sri Lanka. In this Study Oddusuddan DS division in Mullaitivu district was selected as research area. After the 30 years conflict situation most people in the Oddusuddan area in Mullaitivu district are subordinate to the poverty line, because most of the displaced people who are female other than male staying here. Women lost their male relatives in struggle, and forced to take a responsibility of their family in order to look after their children, aged parents and their male relatives.  Micro credit helps the poor people particularly women in effective ways in order to create income generating activities.  The prime objective of this study is to investigate the impact of Microcredit on living standard of dairy entrepreneurs in Oddusuddan DS division in Mullaitivu District. In the rural areas of Mullaitivu, Oddusuddan Divisional Secretariat Divisions 100 dairy entrepreneurs were selected as the sample size of population. The selected entrepreneurs who have received loan from samurdhi bank for dairy farming activities in Oddusuddan DS Division. Primary data were used for gathering information and quantitative analysis was carried out to find out the results. In the quantitative analysis the correlation and regression methods were employed to examine the hypotheses by using SPSS. The result of this study concluded that there is a positive impact of samurdhi micro credit on living standard of dairy entrepreneurs in Oddusuddan DS Division. In addition to this, using micro credit facilities create more job opportunities and variety of economic activities and improve household education, income, saving and heath condition of the people. The study recommends that micro credit institution should consider improve the living standard of dairy entrepreneurs through increase the loan amount with lower interest rate.

Unexpected motor patterns for hindlimb muscles during slope walking in the cat

1995 ◽  
Vol 74 (5) ◽  
pp. 2211-2215 ◽  
Author(s):  
J. L. Smith ◽  
P. Carlson-Kuhta
Keyword(s):  
High Speed ◽  
Stance Phase ◽  
Vastus Lateralis ◽  
Activity Patterns ◽  
Biceps Femoris ◽  
Related Activity ◽  
Motor Patterns ◽  
Extensor Muscles ◽  
Flexor Muscles ◽  
External Forces

1. Hindlimb kinematics and motor patterns were assessed from high-speed cine film synchronized with electromyographic (EMG) data from cats trained to walk on a walkway placed at four grades (25, 50, 75, and 100%). 2. Flexor muscles of the hip (iliopsoas) and ankle (tibialis anterior) had similar activity patterns for the swing phase of up- and down-slope walking; both flexor muscles also had stance-related activity during down-slope walking and this was unexpected. Extensor muscles of the hip (anterior biceps femoris and anterior semimembranosus), knee [vastus lateralis (VL)], and ankle [lateral gastrocnemius (LG)] were active during the stance phase of up-slope walking. The VL and LG activity was reduced in duration during stance of down-slope walking and centered around paw contact. Hip extensors, however, were totally inactive during stance of down-slope walking, and this was not expected. 3. Flexor muscles at the hip and ankle (not extensor muscles) dominated the stance phase of down-slope walking, especially at the steeper slopes. This switch in motor patterns may be required to counterbalance external forces that produced extension at the hip and ankle joints during the stance phase of down-slope walking. Neural mechanisms for programming stance-related activity of flexor muscles are discussed.

Sign in / Sign up

Export Citation Format

Share Document