scholarly journals Kinetics and Kinematics of Working Trials Dogs: The Impact of Long Jump Length on Peak Vertical Landing Force and Joint Angulation

Animals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2804
Author(s):  
Ellen Williams ◽  
Anne Carter ◽  
Jacqueline Boyd

Working trials is a competitive canine discipline based on work undertaken by military and police dogs. A 9 ft long jump is a key component of the discipline. Research into landing forces and joint angulation in other canine disciplines has highlighted the potential for the occurrence of soft tissue injuries, predominantly in the front limbs. There is a paucity of work into the impact of spread/long jumps on joint angulation and peak vertical force (PVF) on landing, and limited research on working trials dogs generally. This study aimed to determine whether altering the length of the long jump impacted PVF and apparent joint angulation upon landing. 21 dogs regularly competing in working trials cleared the long jump at three lengths: 9 ft (full length), 8 ft, and 7 ft. The impact of altered long jump length on the PVF, apparent shoulder and carpus angulation, and duration of landing, were analysed using general linear mixed models. There was no significant relationship between the length of the long jump and PVF or joint angulation on landing (p > 0.05). Greatest joint compression was observed on landing after clearing 9 ft. Individual variability in landing joint angulation, PVF and force distribution of the left and right front limbs on landing was observed across all three experimental lengths. We recommend further research is undertaken to examine individual variability and the effect of training and experience in working trials participants, to provide evidence-based recommendations for training people and competing dogs in this discipline.

Animals ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 134
Author(s):  
Ellen Williams ◽  
Anne Carter ◽  
Jacqueline Boyd

The authors wish to make the following correction to this paper [...]


2021 ◽  
Vol 2 (Supplement_1) ◽  
pp. A25-A25
Author(s):  
S Blunden ◽  
J Osborne

Abstract Background Behavioural sleep interventions to improve infant sleep disturbance commonly include extinction where an unwanted behaviour (night time crying) is periodically ignored. There have been conflicting findings regarding the impact of extinction methods on infant stress levels as measured with cortisol and as perceived by mothers and only one that measured cortisol at the time of the separation. This study aimed to compare a responsive method to extinction (controlled crying) and a control group evaluating subjective and objective stress for mother/infant dyads at the time of bedtime separation. Methods Mother/infant dyads were randomly allocated to behavioural sleep interventions (Responsive - n= 7, Controlled Crying - n=6 or Controls - n=4). Cortisol (two oral swabs on two nights at T2), maternal self-reported stress (Subjective Units of Distress - SUDS), and perceived infant distress (PIS) were compared over eight weeks. Correlations tested relationships between PIS, SUDS and infant cortisol levels. Mixed models analysis were used for cortisol analyses. Results There were no significant differences in cortisol levels between groups across time points but significant inter and intra-individual variability. Maternal stress was positively correlated with infant cortisol and PIS (p<0.05) and mothers in the Responsive group were significantly less stressed (p=0.02). Conclusion In this small sample, infant cortisol during bedtime separation was variable, elevated in all sleep interventions and not significantly different. Mothers were less stressed in the Responsive group. Findings indicate responsive methods are comparable to extinction and less stressful for mothers offering a possible gentler choice at bedtime separation.


2019 ◽  
Vol 25 (5) ◽  
pp. 483-495 ◽  
Author(s):  
André Dallmann ◽  
Paola Mian ◽  
Johannes Van den Anker ◽  
Karel Allegaert

Background: In clinical pharmacokinetic (PK) studies, pregnant women are significantly underrepresented because of ethical and legal reasons which lead to a paucity of information on potential PK changes in this population. As a consequence, pharmacometric tools became instrumental to explore and quantify the impact of PK changes during pregnancy. Methods: We explore and discuss the typical characteristics of population PK and physiologically based pharmacokinetic (PBPK) models with a specific focus on pregnancy and postpartum. Results: Population PK models enable the analysis of dense, sparse or unbalanced data to explore covariates in order to (partly) explain inter-individual variability (including pregnancy) and to individualize dosing. For population PK models, we subsequently used an illustrative approach with ketorolac data to highlight the relevance of enantiomer specific modeling for racemic drugs during pregnancy, while data on antibiotic prophylaxis (cefazolin) during surgery illustrate the specific characteristics of the fetal compartments in the presence of timeconcentration profiles. For PBPK models, an overview on the current status of reports and papers during pregnancy is followed by a PBPK cefuroxime model to illustrate the added benefit of PBPK in evaluating dosing regimens in pregnant women. Conclusions: Pharmacometric tools became very instrumental to improve perinatal pharmacology. However, to reach their full potential, multidisciplinary collaboration and structured efforts are needed to generate more information from already available datasets, to share data and models, and to stimulate cross talk between clinicians and pharmacometricians to generate specific observations (pathophysiology during pregnancy, breastfeeding) needed to further develop the field.


2010 ◽  
Vol 152-153 ◽  
pp. 164-170
Author(s):  
Jie Liu ◽  
Jian Lin Li ◽  
Ying Xia Li ◽  
Shan Shan Yang ◽  
Ji Fang Zhou ◽  
...  

Specific to the improvement in the present research of mechanical response under cyclic loading, this paper, taking the calcareous middle- coarse sandstone as the research subject and the RMT-150C experimental system in which data is recoded by ms magnitude as the platform, develops several related models concerning the unloading rate of triangle waves. The unloading process is divided into lag time segment and non-lag time segment, with criterions and related parameters provided as well. The term apparent elastic modulus is defined. The test data analysis shows that there exist a linear relationship between the apparent modulus and instant vertical force before load damage in non-lag time segment. On the preceding basis, a rate-dependent model of triangular wave un-installation section in non-lag time segment is established. Due to the inability of the loading equipment to accurately input the triangle wave, the average loading rate is amended and a constant term is added into it. The model is proved to be reliable, as the predicted value of the deformation rate and the stress strain curve coincides with measured value. At the same time, the impact of the lag time is pointed out quantitatively and a predication model of lag time segment is set up.


2021 ◽  
Vol 54 (1) ◽  
pp. 163-185
Author(s):  
Sung Min Han ◽  
Mi Jeong Shin

AbstractIn this article, we argue that rising housing prices increase voter approval of incumbent governments because such a rise increases personal wealth, which leads to greater voter satisfaction. This effect is strongest under right-wing governments because those who benefit from rising prices—homeowners—are more likely to be right-leaning. Non-homeowners, who are more likely to vote for left-leaning parties, will view rising housing prices as a disadvantage and therefore feel the government does not serve them well, which will mitigate the advantage to left-wing governments. We find support for our arguments using both macro-level data (housing prices and government approval ratings in 16 industrialized countries between 1960 and 2017) and micro-level data (housing prices and individuals’ vote choices in the United Kingdom using the British Household Panel Survey). The findings imply that housing booms benefit incumbent governments generally and right-wing ones in particular.


2020 ◽  
Vol 34 (4) ◽  
pp. 439-458 ◽  
Author(s):  
Susan C. South ◽  
Michael J. Boudreaux ◽  
Thomas F. Oltmanns

Personality disorders (PDs) are significantly, negatively related to marital satisfaction. We examine how maladaptive personality is related to change in marital satisfaction over time utilizing data from the St. Louis Personality and Aging Network (SPAN), a longitudinal, community-based study of personality and health in older adults. Participants were assessed at baseline for PD (self-report, informant-report, and structured interview); self- and spouse-reported relationship satisfaction assessed at baseline and five follow-ups was analyzed with latent growth curve modeling. Higher levels of PD at baseline were associated with lower self and spouse relationship satisfaction at baseline. On average, satisfaction did not change significantly over the study period, but there was significant individual variability. Higher levels of schizoid PD were protective of declines in partner's perception of satisfaction. Findings suggest that partners in long-term married unions may have adapted to the presence of their own or their spouse's level of personality pathology.


Author(s):  
Kh.M. Laypanova ◽  
N.A. Zharkin ◽  
Yu.A. Shatilova

The aim of the paper is to determine the impact of COL1A1 gene polymorphism on soft tissue injuries in maternity patients. Materials and Methods. The study involved 62 maternity patients who were divided into 2 groups. The first group included 45 patients (72.5 %) without type 1 collagen mutation, alpha 1 Sp1-polymorphism (G2046T) G/G. The second group consisted of 16 patients (27.5 %) with mutation in COL1A1 gene, Sp1-polymorphism (G2046T) G/T. During the study, a homozygous mutation, Sp1-polymorphism (G2046T) T/T was observed in one patient. Age, parity and mean fetal weight of women were comparable. Results. In patients with the COL1A1 mutation, Sp1-polymorphism (G2046T), the incidence of soft tissue birth injuries was 2.3 times higher than in those without such a mutation. Thus, it was confirmed that COL1A1 gene mutation contributes to the soft tissue trauma of the birth canal. It can be regarded as a prognostic criterion and as a basis for preventive measures during pregnancy. Conclusion. Birth trauma risks remain a controversial issue. One of the factors may be COL1A1 gene mutation. Key words: birth trauma, pelvic floor muscle insufficiency, collagen 1 gene polymorphism (COL1A1). Цель работы – определить роль полиморфизма гена COL1A1 у женщин с родовыми травмами мягких тканей родовых путей. Материалы и методы. В исследовании приняло участие 62 родильницы, которые были разделены на 2 группы. В первую группу включены 45 (72,5 %) родильниц, у которых мутация коллагена типа 1, альфа 1 Sp1-polymorphism (G2046T) G/G не обнаружена. Во второй группе, состоящей из 16 (27,5 %) родильниц, обнаружена мутация гена COL1A1 Sp1-polymorphism (G2046T) G/T. В процессе проведения исследования у одной пациентки обнаружена гомозиготная мутация Sp1-polymorphism (G2046T) T/T. Пациентки были сопоставимы по возрасту, паритету и средней массе плода. Результаты. У пациенток с мутацией COL1A1 Sp1-polymorphism (G2046T) частота родовых травм мягких тканей оказалась в 2,3 раза выше, чем у пациенток без мутации. Таким образом, подтверждено, что мутация данного гена имеет определенное значение в реализации риска травм мягких тканей родовых путей, что может послужить прогностическим критерием и основанием для проведения профилактических мероприятий в период беременности. Выводы. Вопрос о рисках родового травматизма остается спорным. Одним их факторов может явиться мутация гена COL1A1. Ключевые слова: родовой травматизм, недостаточность мышц тазового дна, полиморфизм гена коллагена 1 (COL1A1).


2021 ◽  
pp. 1-8
Author(s):  
John R. Harry ◽  
John Krzyszkowski ◽  
Luke D. Chowning ◽  
Kristof Kipp

This study sought to identify potential predictors of standing long jump (SLJ) performance using force–time strategy metrics within the unloading, eccentric yielding, eccentric braking, and concentric phases. Fifteen National Collegiate Athletic Association division 1 male soccer players (19 [1] y, 1.81 [0.94] m, 80.3 [22.4] kg) performed 3 maximum-effort SLJs, while 3-dimensional ground reaction force (GRF) data were obtained. Regularized regression models were used to investigate associations between force–time strategy metrics and 2 metrics of SLJ performance (ie, jump distance and modified reactive strength index). Jump height and eccentric yielding time were the only predictors of jump distance that also demonstrated large correlations to jump distance. Anterior–posterior unloading yank, average concentric vertical force, and concentric phase duration were the only predictors of modified reactive strength index that also demonstrated large correlations to modified reactive strength index. To maximize SLJ distance in high-level soccer athletes, human performance practitioners could design interventions to drive changes in strategy to increase jump height and decrease eccentric yielding time. To improve SLJ explosiveness, interventions to drive changes in unloading and concentric force application and decrease concentric time could be emphasized. Importantly, unique variable combinations can be targeted when training for SLJ distance and explosiveness adaptations.


2021 ◽  
Author(s):  
Katerina Machacova ◽  
Hannes Warlo ◽  
Kateřina Svobodová ◽  
Thomas Agyei ◽  
Tereza Uchytilová ◽  
...  

<p>Trees are known to be sources of methane (CH<sub>4</sub>), an important greenhouse gas, into the atmosphere. However, still little is known about the seasonality of the tree stem CH<sub>4</sub> fluxes, particularly for the dormant season, and about the impact of environmental parameters on this gas exchange. This makes the estimation of net annual ecosystem CH<sub>4</sub> fluxes difficult.</p><p>We determined seasonal dynamics of CH<sub>4</sub> exchange of mature European beech stems (<em>Fagus sylvatica</em>) and of adjacent forest floor in a temperate montane forest of White Carpathians, Czech Republic, from November 2017 to December 2018. We used static chamber methods and gas chromatographic analyses. We aimed to understand the unknown role in seasonal changes of CH<sub>4</sub> fluxes of these forests, and the spatiotemporal variability of the tree fluxes.</p><p>The beech stems were net annual sources for atmospheric CH<sub>4</sub>, whereas the forest floor was a predominant sink for CH<sub>4</sub>. The stem CH<sub>4</sub> emissions showed high inter-individual variability and clear seasonality following the stem CO<sub>2</sub> efflux. The fluxes of CH<sub>4</sub> peaked during the vegetation season, and remained low but significant to the annual totals during winter dormancy. By contrast, the forest floor CH<sub>4</sub> uptake followed an opposite flux trend with low CH<sub>4</sub> uptake detected in the winter dormant season and elevated CH<sub>4</sub> uptake during the vegetation season. Based on our preliminary analyses, the detected high spatial variability in stem CH<sub>4</sub> emissions can be explained neither by the CH<sub>4</sub> exchange at the forest floor level, nor by soil CH<sub>4</sub> concentrations, soil water content and soil temperature, all measured in vertical soil profiles close to the studied trees.</p><p>European beech trees, native and widely spread species of Central Europe, seem to markedly contribute to the seasonal dynamics of the ecosystem CH<sub>4</sub> exchange, and their CH<sub>4</sub> fluxes should be included into forest greenhouse gas emission inventories.</p><p> </p><p><em>Acknowledgement</em></p><p><em>This research was supported by the Czech Science Foundation (17-18112Y), National Programme for Sustainability I (LO1415), CzeCOS (LM2015061), and SustES - Adaptation strategies for sustainable ecosystem services and food security under adverse environmental conditions (CZ.02.1.01/0.0/0.0/16_019/0000797). We thank Libor Borák and Leszek Dariusz Laptaszyński for their technical and field support.</em></p><p> </p>


2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
J Devroe ◽  
K Peeraer ◽  
T D’Hooghe ◽  
J Boivin ◽  
J Vriens ◽  
...  

Abstract Study question What is the impact of providing couples with their IVF-prognosis on expectations and anxiety in women and men on the day of embryo transfer? Summary answer Only couples with a less than average IVF-prognosis updated their high expectations and IVF-prognosis was negatively associated with anxiety, especially in women. What is known already Female IVF-patients are known to expect a pregnancy rate per IVF-cycle of no less than 49-55%. Qualitative interviews and a survey showed that well informed women expect unrealistically high pregnancy rates as they think that their (family’s) fertility and their clinic is better than average. Several prognostic models have recently been published. The adapted van Loendersloot model including clinical and laboratory characteristics proved performant for our clinic (AUC=0.74) and was validated internally (Devroe et al, BMJ Open, 2020). The impact of providing couples with their IVF-prognosis on expectations and wellbeing of female and male patients has yet to be studied. Study design, size, duration A prospective survey, questioning a final sample of 148 partnered individuals, completing their 2nd-6th IVF-cycle (2019-2020) in a University clinic, on the days of oocyte aspiration (OA) and fresh embryo transfer (ET). Thirty other partnered individuals declined participation (participation rate=85%) and 26 were excluded due to ET-cancellation. The IVF-prognosis (live birth rate, LBR, per completed IVF-cycle including fresh and frozen ETs from the same ovarian stimulation) was calculated with the adapted van Loendersloot model. Participants/materials, setting, methods Each partner reported their perception of their expected IVF-LBR on a visual analogue scale on the day OA. After being informed on their IVF-prognosis by gynaecologists, they re-rated their expected IVF-LBR and filled out the reliable ‘STAI-State-Anxiety Inventory’ on the day of fresh ET. Linear mixed models, taking account of partnering and assessing the association with gender, explored whether individuals updated their expected IVF-LBR after receiving their IVF-prognosis and whether IVF-prognosis and anxiety were associated. Main results and the role of chance The mean IVF-prognosis was 30.9% (±16.8). The 148 partnered individuals had a mean expected IVF-LBR of 59.1% (±20.0) on the day of OA (no gender effect; p = 0.079). After being informed on their IVF-prognosis (day of ET), women’s and men’s mean expected IVF-LBR was 50.9% (±24.5) and 58.1% (±22.1), respectively (gender effect; p = 0.002). Linear mixed models, including couple and time as random factors, did not show an effect of time on expected IVF-LBRs (p = 0.15). Although women were more likely than men to update their expected IVF-LBR (p = 0.002), the updates were not significantly different from the IVF-LBR expected on the day of OA (p = 0.10). Women were more anxious than men (41.5±10.6 and 21.9±7.2, respectively, p < 0.001) after being given their IVF-prognosis. Linear mixed models, including couple as a random factor, showed an association between IVF-prognosis and anxiety (p = 0.016), especially in women (gender effect; p = 0.004). Subgroup analysis showed that partnered individuals with lower than average prognoses (n = 78) did update their expected IVF-LBR (p = 0.036) while others (n = 70) did not update their expected IVF-LBR (p = 0.761). Among the subgroup with lower prognoses women were more likely to update their expected IVF-LBR than men (p = 0.013), while no gender effect was observed among the subgroup with higher IVF-prognoses (p = 0.078). Limitations, reasons for caution This is an explorative study in preparation of an adequately powered randomized controlled trial, testing whether couples who are informed on their IVF-prognosis update their expected IVF-LBR and whether this causes anxiety, as compared to care as usual in which couples are not informed on their IVF-prognosis. Wider implications of the findings Men and especially women with a less than average prognosis update their IVF-expectations after having received this prognosis which may trigger anxious reactions. These findings should be re-examined in an RCT. Following up the effect of sharing IVF-prognoses on longer-term distress and IVF-discontinuation would be interesting. Trial registration number not applicable


Sign in / Sign up

Export Citation Format

Share Document