Quantifying Explosive Actions in International Women’s Soccer

2017 ◽  
Vol 12 (3) ◽  
pp. 310-315 ◽  
Author(s):  
César Meylan ◽  
Joshua Trewin ◽  
Kelly McKean
Keyword(s):  
High Speed ◽  
Movement Analysis ◽  
Match Analysis ◽  
Change Of Direction ◽  
National Team ◽  
Global Positioning ◽  
Before And After ◽  
The Mean ◽  
The Right ◽  
Women's Soccer

The aims of the current study were to examine the external validity of inertial-based parameters (inertial movement analysis [IMA]) to detect multiplanar explosive actions during maximal sprinting and change of direction (COD) and to further determine its reliability, set appropriate magnitude bands for match analysis, and assess its variability during international women’s soccer matches. Twenty U20 female soccer players, wearing global positioning system (GPS) units with a built-in accelerometer, completed 3 trials of a 40-m sprint and a 20-m sprint with a change of direction to the right or left at 10 m. Furthermore, 13 women’s national-team players (157 files; 4–27 matches/player) were analyzed to ascertain match-to-match variability. Video synchronization indicated that the IMA signal was instantaneous with explosive movement (acceleration, deceleration, COD). Peak GPS velocity during the 40-m sprint showed similar reliability (coefficient of variation [CV] = 2.1%) to timing gates but increased before and after COD (CV = 4.5–13%). IMA variability was greater at the start of sprints (CV = 16–21%) than before and after COD (CV = 13–16%). IMA threshold for match analysis was set at 2.5 m · s–1 · s–1 by subtracting 1 SD from the mean IMA during sprint trials. IMA match variability (CV = 14%) differed from high-speed GPS metrics (35–60%). Practitioners are advised that timing lights should remain the gold standard for monitoring sprint and acceleration capabilities of athletes. However, IMA could be a reliable method to monitor explosive actions between matches and assess changes due to various factors such as congested schedule, tactics, heat, or altitude.

Effect of total hip arthroplasty on brake reaction time and braking force

2020 ◽  
pp. 112070002093663
Author(s):  
Henrik C Bäcker ◽  
David Krüger ◽  
Sophie Spies ◽  
Carsten Perka ◽  
Stephanie M Kirschbaum ◽  
...  
Keyword(s):  
Reaction Time ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Driving Experience ◽  
Total Hip ◽  
Emergency Braking ◽  
Before And After ◽  
The Mean ◽  
Braking Force ◽  
The Right

Introduction: The correct moment for return to driving after total hip arthroplasty (THA) remains unclear. Until today no uniform recommendation exists on the ability to perform an emergency brake. The aim of this prospective study was to investigate the braking ability of patients before and after THA implantation based on brake reaction time in milliseconds (BRT) and braking force in N (BF). Methods: In total, 25 patients (15 men, 10 women, mean age 51.3 ± 10.1 years) were treated with THA on the right side. Inclusion criteria consisted of a valid driving licence, frequent road participation and at least 2 years of driving experience. Exclusion criteria were underlying neurological disorders as well as severe complaints in the lumbar spine and the right knee joint. The brake ability was evaluated for emergency braking with a car simulator and a measuring sole. Measurements were performed preoperatively, 6 days, 2, 4 and 6 weeks after surgery. Results: Preoperatively, the mean BRT was 671.3 ± 123.5 ms and the BF 455.4 ± 185.0 N. Significant differences were observed at 6 days and 2 weeks after surgery, (BRT 836.4 ± 219.7 ms, respectively, BRT 735.0 ± 186.7 ms, and BF 302.6 ± 154.9 N, respectively, BF 375.5 ± 149.3 N, p < 0.05). Only 4 weeks after, no significant differences were seen compared to pre-operative with a BRT of 647.0 ± 91.9ms ( p = 0.354) and BF of 435.9 ± 177.4 ( p = 0.843). Furthermore, the BRT improved significantly after 6 weeks (607.4 ± 87.6; p = 0.005). Conclusions: The braking force is significantly reduced, and the brake reaction time is prolonged directly after surgery for at least 2 weeks. After 4 weeks, no statistically significant differences were measured, although special care should still be taken during return to activity.

scholarly journals A Change in Ocular Circulation after Photocoagulation for Retinopathy of Prematurity in a Neonate

2017 ◽  
Vol 8 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Tadashi Matsumoto ◽  
Takashi Itokawa ◽  
Tomoaki Shiba ◽  
Kotaro Hine ◽  
Yuichi Hori
Keyword(s):  
Optic Nerve ◽  
Retinopathy Of Prematurity ◽  
Ocular Blood Flow ◽  
Laser Speckle ◽  
Laser Speckle Flowgraphy ◽  
Ocular Circulation ◽  
Before And After ◽  
Photocoagulation Treatment ◽  
The Mean ◽  
The Right

Background: The dilation of veins and tortuosity of arteries that occur in retinopathy of prematurity (ROP) are improved by therapy, and thus posttherapy changes in ocular circulation are also conceivable. We report a case of ROP in which we were able to measure the ocular circulation before and after photocoagulation therapy, using a laser speckle flowgraphy (LSFG) system that is modified for neonates. Case Report: A female infant was born at 25 weeks’ gestation with a birth weight of 808 g. We performed photocoagulation in both eyes at age 15 weeks, and we measured the ocular circulation with the “LSFG-baby” system before and at 12 weeks after the photocoagulation treatment. We also measured the mean blur rate (MBR) in the optic nerve head (ONH) and the relative flow volume (RFV) in the retinal vessels, and we examined the change rates from before to after treatment. The changing rate of the MBR-A (the mean of all values) in the ONH in the right and left eyes was 76.5 and 98.5%, respectively. The vascular RFV in the severe dilation and tortuosity quadrant also tended to decrease. Conclusions: Photocoagulation improved the dilation of veins and tortuosity of arteries and reduced the ocular blood flow in this neonate with ROP. The LSFG-baby system effectively and directly revealed the optic nerve and retinal blood vessels.

scholarly journals Effect of Cable Cerclage on Regional Blood Circulation in Rabbits: A Scintigraphic Study

2016 ◽  
Vol 24 (3) ◽  
pp. 367-369 ◽  
Author(s):  
Ozgur Karakoyun ◽  
Ertan Sahin ◽  
Mehmet Fatih Erol ◽  
Mesut Kariksiz ◽  
Metin Kucukkaya
Keyword(s):  
Blood Circulation ◽  
Kirschner Wire ◽  
Blood Perfusion ◽  
Medullary Canal ◽  
Post Intervention ◽  
Left Femur ◽  
Femoral Cortex ◽  
Before And After ◽  
The Mean ◽  
The Right

Purpose To evaluate changes in blood circulation of the femoral cortex in rabbits using scintigraphy before and after cable cerclage alone or combined with an intramedullary Kirschner wire. Method Ten New Zealand rabbits were used. For the right femur, a 2-mm-thick cable was placed around the mid-diaphyseal region and squeezed with a 400-N force and locked with a clip. For the left femur, a 1.8-mm Kirschner wire was inserted retrogradely into the medullary canal, and a 2-mm-thick cable was applied using the same technique. The blood perfusion ratio of the region of interest (ROI) before and after surgery was evaluated using scintigraphy. Results For the right femurs, the mean ROI perfusion ratio decreased by 45% from 2.51 to 1.37 after intervention (p=0.001). For the left femurs, the mean ROI perfusion ratio decreased by 56% from 2.12 to 0.92 after intervention (p<0.001). The mean ROI perfusion ratio post-intervention was higher in the right than left femurs (p=0.017). Conclusion Cable cerclage around the femoral cortex significantly decreased blood circulation in the area.

scholarly journals Comparing the hand grip power and creatine kinase levels of U-17 judo national team athletes before and after a 6-week strength training

2020 ◽  
Vol 24 (4) ◽  
pp. 163-168 ◽  
Author(s):  
Mehmet Soyal ◽  
Nuri M. Çelik
Keyword(s):  
Creatine Kinase ◽  
Strength Training ◽  
Female Athletes ◽  
Female Participant ◽  
Male And Female ◽  
National Team ◽  
Hand Grip ◽  
Before And After ◽  
The Mean ◽  
Grip Power

Background and Study Aim. The aim of this study is to compare the hand grip power and creatine kinase levels of male and female U-17 National Team Athletes before and after a 6-week strength training. Material and Methods. 15 female and 15 male U-17 athletes, who previously participated in international competitions, participated in our study. Besides the hand grip power and creatine kinase values, age, height, weight, and BMI (body mass index) values of the athletes were measured before and after the training. As the conclusion of the measurements, the mean age of the female participant athletes was determined as 14,93 years, their mean height was 158,3 cm, and the mean age of the male athletes was 15,73 years, while their mean height was 173,1 cm. Results: As the conclusion of the measurements, it was determined that there were statistically significant differences between the right hand grip power and left hand grip power parameters of male and female participant athletes measured before and after the 6-week training. Moreover, it was determined that there were statistically significant differences between the pre-test and post-test measurements of creatine kinase values of both male and female athletes (p> 0,05). Conclusions. As the conclusion, it was determined that the 6-week strength trainings applied to U-17 Judo National Team athletes caused significant changes in their hand grip power and creatine kinase values. The significant results obtained from our study are considered to be originated from the duration, scope, frequency, severity, and content of the training. 

scholarly journals Cycloplegic Effects on the Cylindrical Components of the Refraction

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Athar Zareei ◽  
Milad Abdolahian ◽  
Shahram Bamdad
Keyword(s):  
Precise Determination ◽  
Lower Amount ◽  
Healthy Individuals ◽  
Male And Female ◽  
Near Vision ◽  
Before And After ◽  
The Mean ◽  
The Right ◽  
Age Range

It is important to predict which astigmatic patients require separate refraction for near vision. This study compared cylindrical components changes by cyclopentolate 1% for the low and high amount of astigmatism. The right eyes of 1014 healthy individuals (307 males and 707 females) with cylindrical refractive power more than −0.5 diopter on autorefractometer were selected. Both male and female patients in the age range of 17–45 years were refracted before and after cycloplegia, using 1% cyclopentolate. All volunteers were classified into 2 subgroups including the lower astigmatism group (−2.25 to −0.50) and the higher astigmatic group (−2.50 to over). Alpines’ method was used to compare the effect of cycloplegic drop on cylindrical power. The mean age in the lower astigmatism group (29.58; 95% CI: 29.18 to 29.99 years) was not significantly different from the higher astigmatic group (29.85; 95% CI: 29.07 to 30.62) and there were no significant differences in gender between these two groups ( P = 0.54 ). Differences between wet and dry refraction in J0 (−0.03; 95% CI:−0.06 to −0.008) and J45 (−0.03; 95% CI:−0.06 to −0.01) were significant only in the higher astigmatic group. Axis changes by the cycloplegic drop in the lower astigmatism group were 3.51 (CI: 3.22 to 3.81) and axis changes by the cycloplegic drop in the higher astigmatism group were 2.21 (CI: 1.73 to 2.49). In patients with a lower amount of astigmatism (−2.25 to −0.50), additional near subjective refraction could be done for precise determination of axis and in patients with a higher amount of astigmatism (−2.50 to over), near subjective refraction might be done for precise determination of power.

scholarly journals Postsurgical Stability of Temporomandibular Joint of Skeletal Class III Patients Treated with 2-Jaw Orthognathic Surgery via Computer-Aided Three-Dimensional Simulation and Navigation in Orthognathic Surgery (CASNOS)

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ling-Chun Wang ◽  
Yi-Hao Lee ◽  
Chi-Yu Tsai ◽  
Te-Ju Wu ◽  
Ya-Ying Teng ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Three Dimensional ◽  
Class Iii ◽  
Skeletal Class ◽  
Computer Aided ◽  
Before And After ◽  
Bimaxillary Orthognathic Surgery ◽  
The Mean ◽  
Dimensional Simulation ◽  
The Right

Objective. The aim of this study is to clarify the postsurgical stability of temporomandibular joints in skeletal class III patients treated with 2-jaw orthognathic surgery which was performed utilizing computer-aided three-dimensional simulation and navigation in orthognathic surgery (CASNOS) protocol. Materials and Methods. 23 consecutive nongrowing skeletal class III patients with mandibular prognathism associated with maxillary retrognathism treated with 2-jaw orthognathic surgery between 2018 and 2019 were enrolled in this study. The surgery was planned according to the standardized protocol of CASNOS (computer-aided three-dimensional simulation and navigation in orthognathic surgery). Computed tomography (CT) scans were performed in all patients 3 weeks presurgically and 6 months postsurgically. ITKSNAP and 3D Slicer software were used to reconstruct three-dimensional facial skeletal images, to carry out image segmentation, and to superimpose and quantify the TMJ position changes before and after surgery. Amount of displacement of the most medial and lateral points of the condyles and the change of intercondylar angles were measured to evaluate the postsurgical stability of TMJ. Results. A total amount of 23 skeletal class III patients female : male = 12 : 11 with age ranged from 20.3 to 33.5 years (mean: 24.39 ± 4.8   years   old ) underwent Le Fort I maxillary advancement and BSSO setback of the mandible. The surgical outcome revealed the satisfactory correction of their skeletal deformities. The mean displacement of the right most lateral condylar point (RL-RL ′ ) was 1.04 ± 0.42   mm and the mean displacement of the left most lateral condylar point (LL-LL ′ ) was 1.19 ± 0.41   mm . The mean displacement of the right most medial condylar point (RM-RM ′ ) was 1.03 ± 0.39   mm and the left most medial condylar point (LM-LM ′ ) was 0.96 ± 0.39   mm . The mean intercondylar angle was 161.61 ± 5.08 ° presurgically and 159.28 ± 4.92 ° postsurgically. Conclusion. The postsurgical position of TM joint condyles in our study only presented a mild change with all the landmark displacement within a range of 1.2 mm. This indicates the bimaxillary orthognathic surgery via 3D CASNOS protocol can achieve a desired and stable result of TMJ position in treating skeletal class III adult patients with retrognathic maxilla and prognathic mandible.

Effects of the Booroola Fec gene on ovarian follicular populations in superovulated Romanov ewes pretreated with a GnRH antagonist

Reproduction ◽  
2000 ◽  
pp. 85-94 ◽  
Author(s):  
JJ Dufour ◽  
Y Cognie ◽  
P Mermillod ◽  
JC Mariana ◽  
RF Romain
Keyword(s):  
Gnrh Antagonist ◽  
Inhibitory Effect ◽  
Lower Plasma ◽  
Diameter Class ◽  
Endocrine Control ◽  
Before And After ◽  
Follicular Size ◽  
The Mean ◽  
The Right ◽  
Ovulatory Follicles

Endocrine control of follicular growth was studied in mature Romanov ewes carrying (RF+) or not carrying (R+2) the Booroola Fec gene during an oestrous cycle after gonadotrophin-dependent follicles were suppressed by treatment with an antagonist of GnRH (Antarelix, 0.5 mg per day) and superovulatory treatment was administered. The left ovary was removed after 10 days of treatment (saline or Antarelix) and the right ovary was removed at the end of the superovulatory treatment. Ewes of both genotypes treated with Antarelix had lower plasma LH concentrations than did controls from day 0 to day 10. The inhibitory effect of Antarelix on LH concentration increased with day of treatment. The variability in FSH concentrations during the initial 10 days was reduced by Antarelix treatment in both genotypes. Plasma FSH concentrations were higher in RF+ ewes than in R+2 ewes. In both genotypes, FSH concentrations varied significantly with day of treatment, with the lowest concentrations at day 8 and the highest concentrations at day 5. RF+ ewes had a greater total and atretic number of antral follicles 0.62-1.12, 1.12-2.00 and 2.00-3.00 mm in diameter (classes 2, 3 and 4) than did R+2 ewes before and after superovulatory treatment. After superovulatory treatment, the total number of atretic and non-atretic follicles > 3.00 mm in diameter (class 5) increased in both genotypes. Superovulatory treatment also increased the number of total and atretic class 4 follicles in RF+ only. Conversely, superovulatory treatment decreased the mean number of class 3 follicles in both genotypes, while the number of atretic follicles was decreased only in R+2 ewes. Antarelix treatment significantly reduced the percentage of follicles > 2.00 mm in diameter in RF+ but not in R+2 ewes. Antarelix treatment before superovulatory treatment increased the total number of class 4 follicles in both genotypes but the increase was more significant in RF+ than in R+2 ewes. These results indicate that Antarelix pretreatment favours a greater superovulatory response in Romanov ewes carrying the Fec gene because ovulatory follicles are recruited from a wider range of follicular size classes.

scholarly journals The Effect of Contextual Factors on Physiological and Activity Profiles in International Women’s Rugby Sevens

2017 ◽  
Vol 12 (3) ◽  
pp. 370-376 ◽  
Author(s):  
Tyler L. Goodale ◽  
Tim J. Gabbett ◽  
Ming-Chang Tsai ◽  
Trent Stellingwerff ◽  
Jeremy Sheppard
Keyword(s):  
Heart Rate ◽  
Global Positioning System ◽  
High Speed ◽  
International Level ◽  
Maximum Heart Rate ◽  
Heart Rate Data ◽  
National Team ◽  
Global Positioning ◽  
Physiological Profiles ◽  
Very High

Purpose:To evaluate the effects of contextual game factors on activity and physiological profiles of international-level women’s rugby sevens players.Methods:Twenty international-level female rugby sevens players from the same national team participated in this study. Global positioning system and heart-rate data were collected at 5 World Rugby Women’s Sevens Series events (2013–14 season).Results:Total, moderate-speed (0.2–3.5 m/s), and high-speed running (3.5–5.0 m/s) distances were significantly greater in the first half (20.1% ± 4.1%, 17.6% ± 6.9%, 24.5% ± 7.8%), during losses (11.4% ± 6.1%, 6.1% ± 6.4%, 26.9% ± 9.8%), during losses of large magnitudes (≥2 tries) (12.9% ± 8.8%, 6.8% ± 10.0%, 31.2% ± 14.9%), and against top-4 opponents (12.6% ± 8.7%, 11.3% ± 8.5%, 15.5% ± 13.9%). In addition, total distance increased (5.0% ± 5.5%) significantly from day 1 to day 2 of tournaments, and very-high-speed (5.0–6.5 m/s) running distance increased significantly (26.0% ± 14.2%) during losses. Time spent between 90% and 100% of maximum heart rate (16.4% ± 14.5%) and player load (19.0% ± 5.1%) were significantly greater in the second half. No significant differences in physiological or activity profiles were observed between forwards and backs.Conclusions:Game half, game outcome, tournament day, opponent rank, and margin of outcome all affected activity profiles, whereas game half affected physiological profiles. No differences in activity or physiological profiles were found between playing positions. Practitioners are advised to develop high-speed running ability in women’s rugby sevens players to prepare them to tolerate the varying factors that affect activity profiles.

scholarly journals Pre-Olympic Ice-Skaters Training Versus Muscle Fatigability Assessed by sEMG

2019 ◽  
Author(s):  
Paweł Pakosz ◽  
Anna Lukanova-Jakubowska ◽  
Mariusz Konieczny
Keyword(s):  
Endurance Training ◽  
Lower Limb ◽  
Surface Electromyography ◽  
Female Athletes ◽  
Gluteus Maximus ◽  
Average Frequency ◽  
Signal Frequency ◽  
National Team ◽  
The Mean ◽  
The Right

The aim of this study was to investigate the size of the change in fatigability of gluteus maximus muscles during difficult endurance training in dynamic conditions. The research covered involved eight female athletes of the Polish National Team in short track, which had been prepared to the Olympic Games in PyeongChang. The sEMG system was used to measure fatigue of right and left gluteus maximus muscles, in the modified Biering-Sorensen test. The test was conducted five times during the training: before training, after warmup, and after each of 3 series of the endurance training. Comparing the mean frequency of the surface electromyography power spectrum of the first and the last seconds of the test, statistically significant reduction (p&lt;0.05) of the average frequency value of the right muscle from 55.61&plusmn;7.08 Hz to 48.64&plusmn;4.48 Hz and left muscle from 58.78&plusmn;4.98 Hz to 53.18&plusmn;4.62 Hz was reported. In the conducted Biering-Sorensen test, the value of the muscle signal frequency measured by surface electromyography decreases, which may prove the muscle fatigue. Reductions in the frequency measured in the first and the last second of the test, was higher of the right lower limb. The size of the d Cohen effect in fatigue drops along with subsequent five tests during the training.

New insertion support device assisted the accurate placement of tunneled cuffed catheter: First experience of 10 cases

2018 ◽  
Vol 19 (5) ◽  
pp. 501-505
Author(s):  
Toshiaki Ohara ◽  
Kazufumi Sakurama ◽  
Satoshi Hiramatsu ◽  
Toshimasa Karai ◽  
Toshiaki Sato ◽  
...  
Keyword(s):  
The Body ◽  
Arteriovenous Graft ◽  
Exit Site ◽  
New Device ◽  
Support Device ◽  
Before And After ◽  
The Mean ◽  
The Right ◽  
Individual Body ◽  
Observation Period

Introduction: The tunneled cuffed catheter is used in hemodialysis patients for whom an arteriovenous fistula or arteriovenous graft is not suitable or for bridging usage of them. Accurate placement of a tunneled cuffed catheter is necessary for safe hemodialysis, but placement is sometimes difficult because of individual body differences. We developed a new device to support accurate placement of the tunneled cuffed catheter. In this study, we report our first clinical experience of the device. Methods: We made the device by expanded polytetrafluoroethylene with some special processes. The processes enable it to maintain plasticity and temporary shape in the autoclaved condition. The device is laid on the surface of the patient’s body to mark the root of the catheter with a felt-tipped marker before catheterization. That enables us to know the accurate catheter root and tunneled cuffed catheter exit site on the body surface. Ten patients underwent tunneled cuffed catheter insertion according to the marking. Case description: The mean age was 71.3 ± 12.8 years. The tunneled cuffed catheter was safely placed according to the marking in all patients, and all catheter tips were placed in the right atrium. The mean verification tip location difference before and after catheterization was 0.70 ± 0.48 cm. This result indicated that the device could assist in inserting a catheter accurately within an error of 1.18 cm. The tunneled cuffed catheters were patent in all the cases, without replacement and complications until the end of bridging use or during the observation period. Conclusion: Our newly developed insertion support device enhances safety and prevents catheter waste during replacement.

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