scholarly journals Bilateral Differences in Peak Force, Power, and Maximum Plié Depth During Multiple Grande Jetés

2013 ◽  
Vol 28 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Matthew Wyon ◽  
Julie Harris ◽  
Derrick Brown ◽  
Frances Clarke
Keyword(s):  
Knee Flexion ◽  
Professional Training ◽  
Peak Force ◽  
Dance Training ◽  
Significant Difference ◽  
Bilateral Differences ◽  
The Right ◽  
Lateral Bias ◽  
Post Hoc ◽  
Leg Dominance

A lateral bias has been previously reported in dance training. The aim of this study was to investigate whether there are any bilateral differences in peak forces, power, and maximum knee flexion during a sequence of three grand jetés and how they relate to leg dominance. A randomised observational design was selected for the study. Volunteers consisted of 20 female dancers in the last year of pre-professional training. All volunteers completed three different tests to determine leg dominance prior to completing a three grande jeté sequence. The lead leg for the jump sequence was randomised. Peak take-off power, relative landing force (BW), and maximum knee flexion angles were measured using a Myotest accelerometer and integrated goniometer. Results indicated that 90% of dancers reported right leg dominance. A significant difference was noted in peak take-off power among the jumps (p<0.01); post hoc test indicated jump 3 was significantly greater than jump 1. Mean maximum take-off knee angles increased over the three-jump sequence with the left leg having a significantly deeper plié than the right (p<0.01). Landing data showed an increase in peak force and a decrease in maximum knee angles across the jump sequence. The present data indicate different bilateral strategies during take-off and landing during grand jetés in female dancers resulting in increased forces during the jumps on the non-dominant side. These differences need to be addressed by incorporating appropriate modifications in training methodology that eliminates the observed bilateral differences.

scholarly journals Bilateral Differences in Dancers' Dynamic Postural Stability During Jump Landings

2020 ◽  
Vol 24 (4) ◽  
pp. 183-189
Author(s):  
Frances Clarke ◽  
Yiannis Koutedakis ◽  
Margaret Wilson ◽  
Matthew Wyon
Keyword(s):  
Postural Stability ◽  
Dance Training ◽  
Risk Of Injury ◽  
Time To Stabilization ◽  
Reaction Forces ◽  
Bilateral Differences ◽  
Lateral Bias ◽  
Leg Dominance ◽  
Dynamic Postural Stability ◽  
Jump Landings

Although traditional dance training aims to train dancers' legs equally, the recognized practice of predominately starting and repeating exercises on one side more than the other has led to suggestions that technique classes may cause lateral bias. Such an imbalance could lead to a greater risk of injury; however, despite this potential risk, little is known about the effects of bilateral differences on dancers' postural stability during jump landings, a key dynamic action in dance. Therefore, the aim of this study was to examine the effects of possible bilateral differences on dynamic postural stability during single-leg landing using a time-to-stabilization protocol. Thirty-two injury-free female university undergraduate dancers (19 ± 1.9 years; 164.8 ± 6.7 cm; 62.6 ± 13.6 kg) volunteered for the study. They completed a two-foot to one-foot jump over a bar onto a force platform while stabilizing as quickly as possible. The landing leg was randomly assigned, and participants completed three trials for each leg. No significant differences in dynamic postural stability between right and left legs were revealed, and poor effect size was noted (p > 0.05): MLSI: t = -.04, df = 190, p = 0.940 (CI = -.04, .04, r2 = 0); APSI: t = .65, df = 190, p = 0.519 (CI = -.06-, .12, r2 = .09); VSI: t = 1.85, df = 190, p = 0.066 (CI = -.02, .68, r2 = .27); DPSI: t = 1.88, df = 190, p = 0.061 (CI = -.02, .70, r2 = .27). The results of this study do not support the notion that dance training may cause lateral bias with its associated risk of injury. Furthermore, dancers' self-perceptions of leg dominance did not correlate with their ability to balance in single-leg landings or to absorb the ground reaction forces often associated with injury. Even when biased training exists, it may not have detrimental effects on the dancer's postural stability.

Effects of Ultrasonic Skeletonization of the Gastroepiploic Artery on Endothelial Nitric Oxide Production

2009 ◽  
Vol 4 (2) ◽  
pp. 93-98 ◽  
Author(s):  
Takuro Terada ◽  
Shigeyuki Tomita ◽  
Yoshihide Asaumi ◽  
Yoshinao Koshida ◽  
Nobuki Ishikawa ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Artery Bypass ◽  
Gastroepiploic Artery ◽  
No Production ◽  
Significant Difference ◽  
Basal Plasma ◽  
Electrosurgical Unit ◽  
The Right ◽  
Post Hoc ◽  
Endothelial Nitric Oxide

Objective The right gastroepiploic artery (GEA) is a reliable conduit for coronary artery bypass grafting. Recently, ultrasonic skeletonization in graft harvesting has attracted attention as an alternative technique to increase the length and caliber size of grafts. The influence of GEA skeletonization using an ultrasonically activated device with that using an electrosurgical unit was compared from the viewpoint of production of nitric oxide (NO). Methods Fourteen pigs were used in this study. The GEA were harvested using an ultrasonically activated device (group ultrasonically activated device [USAD], n = 7) or electrocautery (group E, n = 7). Blood sampling was performed at the following three times from the distal end of the GEA: (1) preskeletonization, (2) pedicle, and (3) postskeletonization. Plasma NOx (NO metabolites) levels were measured by chemiluminescent assay. Moreover, in excised specimens, the expression of nitric oxide synthase was examined immunohistologically. Results In group USAD, the preskeletonization basal level of plasmaNOx in GEA was 25.7 ± 10.9 μmol/L, which then increased to 26.9 ± 10.5 μmol/L (pedicle) and 32.2 ± 12.1 μmol/L (postskeletonization). In group E, the preskeletonization basal plasma NOx level in GEA was 28.9 ± 11.4 μmol/L, which changed to 27.5 ± 8.9 μmol/L (pedicle) and 21.8 ± 8.3 μmol/L (postskeletonization). The results of multivariate analysis indicated that the patterns of changes in plasma NOx level were significantly different in both groups (P = 0.024). In group USAD, post hoc multiple comparison tests revealed a significant difference between preskeletonization and postskeletonization (P = 0.037). Conclusions Ultrasonically skeletonized GEA showed increased effective graft length, higher free flow capacity, and increased endothelial NO production than that prepared using an electrosurgical unit.

Exploring Active and Passive Contributors to Turnout in Dancers and Non-Dancers

2015 ◽  
Vol 30 (2) ◽  
pp. 78-83 ◽  
Author(s):  
Kristen Sutton-Traina ◽  
Jo A Smith ◽  
Danielle N Jarvis ◽  
Szu-Ping Lee ◽  
Kornelia Kulig
Keyword(s):  
External Rotation ◽  
Peak Force ◽  
Ultrasound Images ◽  
Cross Sectional ◽  
Dance Training ◽  
Femoral Version ◽  
Significant Difference ◽  
Hip Abductor ◽  
The Difference ◽  
Bony Morphology

OBJECTIVE: Lower-extremity external rotation, or turnout, is a fundamental skill in dance. Active standing turnout has previously been measured using low-friction turnout disks. Turnout is influenced by passive range of motion (ROM) and strength, with passive ROM a function of bony morphology and ligamentous/capsular restraints. PURPOSE: Our study explored the relationship between standing active turnout and femoral bony morphology, hip passive ROM, and strength among dancers and non-dancers. METHODS: Cross-sectional cohort study. Twenty-three female dancers and 13 female non-dancers aged 18 to 30 yrs were recruited. Standing active turnout on reduced-friction disks, ultrasound images of femoral version, supine passive turnout, and hip abductor and external rotator strength were collected. RESULTS: Dancers demonstrated greater standing turnout (107º±18º) than non-dancers (92º±28º), but the difference was not statistically significant (p=0.054). A significant difference was found for femoral version (p<0.001), 4.7º (±2.8º) for dancers vs 12.1º (±4.6º) for non-dancers. Dancers demonstrated greater supine turnout, 102.7º±18.8º, compared to non-dancers, 84.3º±30.4º (p=0.031). Dancers were able to achieve greater peak force in turnout compared to non-dancers: 2.44±0.44 N/kg and 1.72±0.59 N/kg, respectively (p<0.0001). Supine total turnout was the best predictor of active turnout, contributing 48% of the variance (r=0.696, p<0.001). CONCLUSION: Our findings suggest supine turnout is the largest predictor for standing turnout. Investigating dancers and non-dancers independently, our finding were similar to previous studies suggesting the femoro-acetabular complex may be influenced by dance training, contributing to differences in bony morphology between dancers and non-dancers. Although strength did not significantly contribute to active standing turnout, dancers demonstrated greater peak force compared to non-dancers.

scholarly journals Photobiomodulation vs. Placebo on Post-Bleaching Sensitivity and Color Change: A Split-Mouth Clinical Study

2020 ◽  
Vol 14 (1) ◽  
pp. 267-274
Author(s):  
Caroline C. de Silva ◽  
Cristiane de M. Alencar ◽  
Brennda L. F. de Paula ◽  
Fernanda F. de A. Jassé ◽  
Jesuína L. N. Araújo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Color Change ◽  
Tooth Bleaching ◽  
Low Level Laser Therapy ◽  
Tooth Color ◽  
Pain Evaluation ◽  
Level Laser ◽  
Significant Difference ◽  
The Right ◽  
Post Hoc

Objective: This study aimed to investigate the efficiency of Photobiomodulation (PBM) with low-level LASER therapy compared to placebo in post-bleaching sensitivity and color change during a three-week office bleaching treatment. Methods: A split-mouth model was used to evaluate 21 subjects. The right and left hemi-archs were randomized to one of two groups: GP (placebo): simulated LASER application followed by tooth bleaching with 35% hydrogen peroxide; and GL: treated with PBM followed by tooth bleaching with 35% hydrogen peroxide. A four-degree modified Visual Analog Scale (VAS) was used to assess tooth sensitivity after the application of an evaporative stimulus (stimulated pain). In addition, a daily questionnaire was used to measure unstimulated pain. The color change was measured using a spectrophotometer. The Friedman and Wilcoxon tests were used to analyze data sensitivity. Color results were statistically analyzed using Analysis Of Variance (ANOVA) followed by the Tukey post-hoc test. Results: There was no significant difference between GP and GL for stimulated pain evaluation (p> 0.05). However, there was a significant difference between the groups for unstimulated pain evaluation (p≤ 0.05). In addition, ΔE data did not reveal any significant difference in tooth color between groups at any time (p> 0.05). Conclusion: PBM prevented post-bleaching sensitivity compared to placebo, based on the daily pain assessment questionnaires. PBM did not compromise the quality of bleaching treatments.

Chinese Classical Dancers Have Improved Spontaneous Activity in Visual Brain Areas

2021 ◽  
pp. 1-7
Author(s):  
Rou Wen ◽  
Lijuan Hou ◽  
Jilong Shi ◽  
Mi Zhang
Keyword(s):  
Resting State ◽  
Professional Training ◽  
Brain Activity ◽  
Brain Areas ◽  
Classical Dance ◽  
Functional Changes ◽  
Dance Training ◽  
Significant Difference ◽  
Professional Dancers

Abstract. Resting-state functional magnetic resonance imaging (fMRI) studies demonstrate that long-term exercise or dance training may cause changes in brain structure and function. However, the changes of neurofunction in the long-term practitioners of Chinese classical dance are still unclear. The purpose of the study is to explore the neurofunctional alterations associated with long-term Chinese classical dance training. Thirty female college students were selected, 15 students majoring in Chinese classical dance (average training years = 9.73 ± 1.75 years) and 15 education-matched non-dancer students with no previous experience of regular dance training. In this cross-sectional design, the resting-state fMRI data were acquired only once to observe the structural and functional changes of the brain. Compared with non-dancers, professional dancers had no significant difference in the total volume of whole brain, gray matter, white matter, and cerebrospinal fluid. While in professional dancers, we found increased amplitude of low-frequency fluctuation (ALFF) in the left superior occipital gyrus, right Cuneus, and left calcarine fissure and surrounding cortex (Calcarine); increased fractional ALFF and regional homogeneity in the right Calcarine, indicating the increase of spontaneous brain activity in these brain areas. Since these brain areas are related to visual cognitive function, the results suggest that long-term Chinese classical dance training is associated with increased spontaneous regional brain activity in the visual areas. This may be closely related to the specific characteristics of Chinese classical dance and long-term professional training.

scholarly journals Patients with Poor Response to Antipsychotics Have a More Severe Pattern of Frontal Atrophy: A Voxel-Based Morphometry Study of Treatment Resistance in Schizophrenia

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mario Quarantelli ◽  
Olga Palladino ◽  
Anna Prinster ◽  
Vittorio Schiavone ◽  
Barbara Carotenuto ◽  
...  
Keyword(s):  
Grey Matter ◽  
Temporal Cortex ◽  
Region Of Interest ◽  
Treatment Resistance ◽  
Poor Response ◽  
Mr Studies ◽  
Normal Volunteers ◽  
Significant Difference ◽  
The Right ◽  
Post Hoc

Approximately 30% of schizophrenia patients do not respond adequately to the therapy. Previous MRI studies have suggested that drug treatment resistance is associated with brain morphological abnormalities, although region-of-interest analysis of MR studies from nonresponder and responder patients failed to demonstrate a statistically significant difference between these two schizophrenia subgroups. We have used a voxel-based analysis of segmented MR studies to assess structural cerebral differences in 20 nonresponder and 15 responder patients and 16 age-matched normal volunteers. Differences between the three groups emerged bilaterally mainly at the level of the superior and middle frontal gyri, primarily due to reduced grey matter volumes in nonresponders, as compared to both normal volunteers and responder patients. Post hoc direct comparison between the two schizophrenia subgroups demonstrated significantly reduced grey matter volumes in middle frontal gyrus bilaterally, in the dorsolateral aspects of left superior frontal gyrus extending into postcentral gyrus and in the right medial temporal cortex. Our results extend and integrate previous findings suggesting a more severe atrophy in nonresponder schizophrenia patients, compared to responder patients, mainly at the level of the superior and middle frontal gyri. Longitudinal studies in drug-naïve patients are needed to assess the role of these associations.

scholarly journals CBCT assessment of alveolar buccal bone level after RME

2012 ◽  
Vol 83 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Valmy Pangrazio-Kulbersh ◽  
Brynn Jezdimir ◽  
Mariana de Deus Haughey ◽  
Richard Kulbersh ◽  
Paul Wine ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Population Sample ◽  
Comprehensive Treatment ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Significant Difference ◽  
Bone Level ◽  
Marginal Bone Level ◽  
The Right ◽  
Post Hoc

Abstract Objective: To evaluate the maxillary alveolar buccal bone levels after expansion with banded and bonded expanders, using cone-beam computed tomography (CBCT). Materials and Methods: The population sample consisted of 22 patients who required expansion during their comprehensive treatment; 10 patients (five males and five females) with a mean age of 13.5 years (CVMS 3) had bonded hygienic expanders, and 12 (six males and six females) with a mean age of 12.6 years (CVMS 3) had banded hyrax expanders. CBCT was taken both before (T1) and 6 months after last activation (T2). Measurements were made for buccal bone thickness (BT), buccal marginal bone level (MBL), and bone thickness level (BTL) at the right first molar (MRt), left first molar (MLft), right first premolar (PMRt), and left first premolar (PMLft). A mixed-design analysis of variance assessed differences between and within the groups. Post hoc t-tests were completed on significant analysis of variance results to determine where differences occurred. Results: Analysis of variance revealed no significant differences between or within the two groups. BT significantly decreased horizontally following rapid maxillary expansion. The amount of bone lost was −0.59 mm MRt, −0.72 mm PMRt, −0.50 mm MLft, and −0.57 mm PMLft (P &lt; .003). Conclusions: There was no significant difference between or within the two groups. Buccal bone loss in the vertical dimension (MBL) only showed significance in the banded group for MRt (0.63 mm) and PMLFt (0.37 mm) as evidenced by the paired t-test (P &lt; .05).

scholarly journals Evaluation of the basic surface roughness of an ISO-certified and non-ISO-certified slot bracket with an atomic force microscope

2019 ◽  
Vol 31 (2) ◽  
pp. 91
Author(s):  
Chrisni Oktavia Jusup ◽  
Eky Setiawan Soeria Soemantri ◽  
Endah Mardiati ◽  
Ida Ayu Evangelina
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Atomic Force Microscope ◽  
Tooth Movement ◽  
Average Roughness ◽  
Base Surface ◽  
Atomic Force ◽  
Significant Difference ◽  
The Right ◽  
Post Hoc

Introduction: The base surface roughness of slot bracket can affect friction in tooth movement. There are ISO-certified and non-ISO-certified stainless steel brackets on the market. Thus orthodontists must be careful in choosing the right bracket. This study was aimed to evaluate the differences of the surface roughness of ISO-certified and non-ISO-certified Roth 0.022 inch stainless steel bracket with the parameter of S a (average roughness). Methods: This research was a laboratory observational. Samples were taken randomly as many as 32 brackets divided into two groups, each consisted of two bracket brands. Surface roughness measurements were performed using an atomic force microscope (AFM), then the data were analysed by ANOVA test (p &lt; 0.05) and Post-Hoc analysis. Results: The ISO-certified bracket has an S a value smaller than the non-ISO-certified bracket. There was a significant difference in the surface roughness of the ISO-certified and non-ISO-certified slot bracket base (p &lt; 0.05). Conclusion: The ISO-certified bracket has a smoother base surface than the non-ISO-certified bracket base.Keywords: Surface roughness, stainless steel slot bracket, atomic force microscope

scholarly journals Pediatric Triage Variations Among Nurses, Pediatric and Emergency Residents Using the Canadian Triage and Acuity Scale

2020 ◽  
Author(s):  
Saleh Alshaibi ◽  
Tala AlBassri ◽  
Suliman AlQeuflie ◽  
Winnie Philip ◽  
Nesrin Alharthy
Keyword(s):  
Clinical Signs ◽  
Sampling Technique ◽  
P Value ◽  
Case Scenario ◽  
Pediatric Residents ◽  
Significant Difference ◽  
Medical City ◽  
The Right ◽  
Post Hoc ◽  
Triage Level

Abstract Background Emergency care continues to be a challenge, since patients’ arrival is unscheduled and simultaneous which may fill the Emergency Department with non-urgent patients. Triaging is an integral part of every busy ED. The Canadian Triage and Acuity Scale (CTAS) is considered to be the most accurate and reliable tool for patient assessment worldwide. This study aims to identify the chosen triage level and compare the variation between registered nurses, pediatric and adult emergency residents by using CTAS cases. Methodology This study was conducted at King Abdulaziz Medical City, Saudi Arabia. A prospective self-administered questionnaire was used, and which contains 15 case scenarios with different triage levels. All cases were adopted from a Canadian triage course after receiving permission. Each case provides the patient’s symptoms, clinical signs and mode of arrival to the ED. The participants were instructed to assign a triage level using the following scale: 1=resuscitation, 2=emergent, 3=urgent, 4=less urgent, and 5=non-urgent. A non-random sampling technique was used for this study. Result A total of 151 participants completed the study questionnaire. 73 (48.34%) were nurses and 78 (51.66%) were residents (42 pediatric residents and 36 emergency residents). Each participant was given a score based on the correct answer for the case scenario. A mean score was compared among the nurses, pediatric residents and emergency residents. Since our data were not normally distributed, we used the Kruskal-Wallis test to observe statistical differences between the groups. The Kruskal Wallis Post-Hoc test was performed to see which groups were statistically significant, and it was found that there was a significant difference between nurses and pediatrics residents (P value < 0.001). Moreover, there were no significant differences found between nurses and ER residents (P value > 0.05). Conclusion The triaging system was found to be a very important tool to prioritize patients based on their complaints. The results showed that nurses had the greatest experience in implementing patients on the right triage level. On the other hand, ER and pediatric residents demonstrated a need to develop more knowledge about CTAS and become exposed more to the triaging system during their training.

A STUDY ON HOW TO ELEVATE ORGANISATIONAL CREATIVITY IN TAIWANESE DESIGN ORGANISATION

2008 ◽  
Vol 12 (04) ◽  
pp. 699-723 ◽  
Author(s):  
WEN-CHIH CHANG ◽  
ZUN-HWA CHIANG
Keyword(s):  
Professional Training ◽  
World View ◽  
Work Experiences ◽  
Design Environment ◽  
Design Work ◽  
Five Factors ◽  
Significant Difference ◽  
Culture Design ◽  
Team Design ◽  
Post Hoc

This research focuses on exploring which factors influence organisational creativity the most, and what actions are the most effective to enhance organisational creativity of design companies and departments in Taiwan. The survey showed that the most influential five factors to organisational creativity were in the order of design environment, team climate, group/organisation culture, design process and motive of work. The survey also showed that the most effective ways of improving organisational creativity were in the order of effective knowledge/experience sharing among colleagues, cultivating the designers' world view, accumulations of team design experiences, visiting domestic and foreign design exhibitions and diversified design work experiences. After the data from the questionnaire were further analysed by t-test, one-way ANOVA and Scheffé post hoc multiple comparisons, the study also showed that the most effective ways of improving organisational creativity were in the significant difference between the design company and design department. Furthermore, in terms of demographic variables of gender, employees' education, professional training, age and working experiences, the study result also implied that the most effective ways of improving organisational creativity could be different under different situations. With follow-up interview, we also found that due to the differences of business conditions, interviewees also had different perspectives referring to the definitions of good ideas. It drew various degrees of attentions when valuating creativity and improving it in the organisation. Thus, in order to get an effective creative performance, while facing different layout strategies and environments, administrators must adjust these measures to fit into their own need according to the conditions or restrictions of the organisations.

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