Training Repeated Effort Ability in National Team Male Volleyball Players

2008 ◽  
Vol 3 (3) ◽  
pp. 397-400 ◽  
Author(s):  
Jeremy M. Sheppard ◽  
Tim Gabbett ◽  
Russell Borgeaud
Keyword(s):  
High Performance ◽  
Testing Procedure ◽  
Movement Speed ◽  
Lateral Movement ◽  
National Team ◽  
Volleyball Players ◽  
Before And After ◽  
The Mean ◽  
Induced Changes

Purpose:This case study evaluated the effect of repeated lateral movement and jumping training on repeated effort ability in a group of national team male volleyball players.Methods:Twelve volleyball players were assessed on their volleyball-specific repeated movement and jumping abilities using a volleyball-specific repeated effort test (RET) before and after 12 weeks of training. The athletes performed between 8 and 9 volleyball training sessions per week, with 5 to 6 of these sessions including specific training aimed at improving repeated effort ability. Typically these training sessions involved 8 to 12 repetitions of 2 to 3 block jumps over a 9-m lateral distance (ie, the athletes had to perform jumps and lateral movements, typical of front court play in volleyball). Population-specific repeatability data were used to determine whether any changes that may have occurred in this study were beyond the minimal clinically important difference (MCID) for this testing procedure.Results:Improvements in all variables of the RET were observed for each athlete involved in the study, with a small-to-moderate magnitude observed for the mean changes in each variable (Cohen’s d, 0.21 to 0.59). All of the improvements in the results exceeded the MCID.Conclusions:These findings demonstrate that the RET is sensitive to training-induced changes. Lateral movement speed and repeated lateral movement speed, as well as jumping and repeated jumping ability are trainable qualities in high-performance volleyball players.

OCT-Angiography as a reliable prognostic tool in laser-treated proliferative diabetic retinopathy: The RENOCTA Study

2020 ◽  
pp. 112067212096345
Author(s):  
Marco Lupidi ◽  
Ramkailash Gujar ◽  
Alessio Cerquaglia ◽  
Jay Chhablani ◽  
Daniela Fruttini ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Proliferative Diabetic Retinopathy ◽  
Additional Treatment ◽  
Post Treatment ◽  
Vascular Perfusion ◽  
Significant Difference ◽  
Before And After ◽  
The Mean ◽  
Pre Treatment ◽  
Induced Changes

Purpose: To quantitatively assess retinal neovascularizations (RNVs) in proliferative diabetic retinopathy (PDR) before and after photocoagulative laser treatment (PLT) using Optical Coherence Tomography Angiography (OCT-A). Methods: Consecutive patients with PDR were examined with fluorescein angiography (FA) and OCT-A before and after PLT. Baseline and after-treatment FA images were quantitatively analyzed to assess both the RNVs area and leakage area. On OCT-A RNVs area, vascular perfusion density (VPD), vessel length density (VLD) and fractal dimension were computed. VPD of the full-retina OCT-A underneath the RNV was determined to evaluate potential laser-induced changes in vascular perfusion. Results: Fifteen eyes of 13 patients with PDR were enrolled. The mean area of the RNVs was 0.47 ± 0.50 mm2 in the baseline OCT-A and 0.32 ± 0.40 mm2 in the post-treatment assessment ( p = 0.0002). The mean RNV VPD of RNV was 2% ± 4% in pre-treatment and 1% ± 1% for the post-treatment ( p = 0.0001). The mean VLD of RNV was 7.26 ± 1.53 at baseline and 6.64 ± 1.65 in the post treatment ( p = 0.0002). A significant difference in terms of mean RNVs area and VPD reduction between eyes that needed additional treatment and those that did not (~40% vs ~20%; p < 0.05), was observed. Mean VPD of full-retinal thickness OCT-angiogram was 55% ± 10% for the pre-treatment and 53% ± 8% for the post treatment scan ( p = 0.02). Conclusion: The quantitative OCT-A assessment of laser-induced changes of RNVs can be a useful non-invasive approach for determining treatment efficacy. A reduction of RNVs area or VPD ⩾ 40% might reveal those eyes that won’t require additional treatment. Retinal perfusion impairment seemed to progress independently from the treatment.

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.

scholarly journals Estimating the effect of tracking tag weight on insect movement using video analysis: A case study with a flightless orthopteran

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0255117
Author(s):  
Oto Kaláb ◽  
David Musiolek ◽  
Pavel Rusnok ◽  
Petr Hurtik ◽  
Martin Tomis ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Temperatures ◽  
Video Analysis ◽  
Movement Speed ◽  
Negative Effects ◽  
Insect Movement ◽  
The Mean ◽  
And Behavior ◽  
Light Medium

In this study, we describe an inexpensive and rapid method of using video analysis and identity tracking to measure the effects of tag weight on insect movement. In a laboratory experiment, we assessed the tag weight and associated context-dependent effects on movement, choosing temperature as a factor known to affect insect movement and behavior. We recorded the movements of groups of flightless adult crickets Gryllus locorojo (Orthoptera:Gryllidae) as affected by no tag (control); by light, medium, or heavy tags (198.7, 549.2, and 758.6 mg, respectively); and by low, intermediate, or high temperatures (19.5, 24.0, and 28.3°C, respectively). Each individual in each group was weighed before recording and was recorded for 3 consecutive days. The mean (± SD) tag mass expressed as a percentage of body mass before the first recording was 26.8 ± 3.7% with light tags, 72 ± 11.2% with medium tags, and 101.9 ± 13.5% with heavy tags. We found that the influence of tag weight strongly depended on temperature, and that the negative effects on movement generally increased with tag weight. At the low temperature, nearly all movement properties were negatively influenced. At the intermediate and high temperatures, the light and medium tags did not affect any of the movement properties. The continuous 3-day tag load reduced the average movement speed only for crickets with heavy tags. Based on our results, we recommend that researchers consider or investigate the possible effects of tags before conducting any experiment with tags in order to avoid obtaining biased results.

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 High-resolution spatial measurements of ventilation-perfusion heterogeneity in rats

2010 ◽  
Vol 108 (5) ◽  
pp. 1395-1401 ◽  
Author(s):  
H. Thomas Robertson ◽  
Melissa A. Krueger ◽  
Wayne J. E. Lamm ◽  
Robb W. Glenny
Keyword(s):  
High Resolution ◽  
Regional Blood Flow ◽  
Laboratory Animals ◽  
Fluorescence Signal ◽  
Method Error ◽  
Mechanically Ventilated ◽  
Before And After ◽  
The Mean ◽  
Induced Changes ◽  
High Resolution Method

This study was designed to validate a high-resolution method to measure regional ventilation (V̇a) in small laboratory animals, and to compare regional V̇a and perfusion (Q̇) before and after methacholine-induced bronchoconstriction. A mixture of two different colors of 0.04-μm fluorescent microspheres (FMS) was aerosolized and administered to five anesthetized, mechanically ventilated rats. Those rats also received an intravenous injection of a mixture of two different colors of 15-μm FMS to measure regional blood flow (Q̇). Five additional rats were labeled with aerosol and intravenous FMS, injected with intravenous methacholine, and then relabeled with a second pair of aerosol and intravenous FMS colors. After death, the lungs were reinflated, frozen, and sequentially sliced in 16-μm intervals on an imaging cryomicrotome set to acquire signal for each of the FMS colors. The reconstructed lung images were sampled using randomly placed 3-mm radius spheres. V̇a within each sphere was estimated from the aerosol fluorescence signal, and Q̇ was estimated from the number of 15-μm FMS within each sphere. Method error ranged from 6 to 8% for Q̇ and 0.5 to 4.0% for V̇a. The mean coefficient of variation for Q̇ was 17%, and for V̇a was 34%. The administration of methacholine altered the distribution of both V̇a and Q̇ within lung regions, with a change in V̇a distribution nearly twice as large as that seen for Q̇. The methacholine-induced changes in V̇a were not associated with compensatory shifts in Q̇. Cryomicrotome images of FMS markers provide a high-resolution, anatomically specific means of measuring regional V̇a/Q̇ responses in the rat.

scholarly journals Clearance Rate and BP-ANN Model in Paraquat Poisoned Patients Treated with Hemoperfusion

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Lufeng Hu ◽  
Guangliang Hong ◽  
Jianshe Ma ◽  
Xianqin Wang ◽  
Guanyang Lin ◽  
...  
Keyword(s):  
Clearance Rate ◽  
High Performance ◽  
Input Data ◽  
Ann Model ◽  
Output Data ◽  
Before And After ◽  
High Prediction ◽  
The Mean ◽  
Clearance Model ◽  
Backpropagation Artificial Neural Network

In order to investigate the effect of hemoperfusion (HP) on the clearance rate of paraquat (PQ) and develop a clearance model, 41 PQ-poisoned patients who acquired acute PQ intoxication received HP treatment. PQ concentrations were determined by high performance liquid chromatography (HPLC). According to initial PQ concentration, study subjects were divided into two groups: Low-PQ group (0.05–1.0 μg/mL) and High-PQ group (1.0–10 μg/mL). After initial HP treatment, PQ concentrations decreased in both groups. However, in the High-PQ group, PQ levels remained in excess of 0.05 μg/mL and increased when the second HP treatment was initiated. Based on the PQ concentrations before and after HP treatment, the mean clearance rate of PQ calculated was 73 ± 15%. We also established a backpropagation artificial neural network (BP-ANN) model, which set PQ concentrations before HP treatment as input data and after HP treatment as output data. When it is used to predict PQ concentration after HP treatment, high prediction accuracy (R=0.9977) can be obtained in this model. In conclusion, HP is an effective way to clear PQ from the blood, and the PQ concentration after HP treatment can be predicted by BP-ANN model.

scholarly journals Using Project Based Learning (PBL) Design to Expand Mathematics Students’ Understanding: A Case Study in Statistics Problem

2018 ◽  
Vol 1 (1) ◽  
pp. 98
Author(s):  
Sugi Hartono
Keyword(s):  
Learning Outcomes ◽  
Quantitative Research ◽  
Positive Response ◽  
Project Based Learning ◽  
T Test ◽  
Mathematics Students ◽  
Before And After ◽  
Quasi Experimental ◽  
The Mean

<p><em>This paper describes some activities that the author has designed using Project Based Learning (PBL) to develop students’ understanding of statistics. This study used a quasi-experimental method with a one group pretest-posttest quantitative research design. The subjects in this study are 30 students of class VII in SMP Negeri 6, Surabaya, Indonesia. The data collected using a questionnaire and a test. The validity of students’ response used product-moment correlations and the reliability test used the Cronbach’s Alpha formula, and the hypothesis was tested using the t-test (one sample t-test). The results showed that the positive response of students using PBL design to expand mathematics students’ understanding of statistics, namely 85.83%. Furthermore, there was a difference in the students’ learning outcomes before and after they learned through the PBL learning design, indicated by pretest the mean of score is 38.30 and a posttest mean score is 67.17. Besides that, t<sub>observed</sub> of pretest is 15.931 and t<sub>observed</sub> of posttest is 34.655, both are greater than t<sub>table</sub> with a significant level ?=0.05 is 2.042. Thus, we could be concludes that there as a difference the understanding of statistics students’ outcome before and after learning with PBL design.</em></p>

scholarly journals ASPECTS REGARDING STRENGTH AND AGILITY IN JUNIOR III WATER POLO PLAYERS

2020 ◽  
pp. 460-471
Keyword(s):  
High Performance ◽  
Time Pressure ◽  
Running Speed ◽  
Motor Proficiency ◽  
National Team ◽  
Water Polo ◽  
School Sports ◽  
Sports Club ◽  
The Mean ◽  
Composite Scores

The research integrates methods of assessment and analysis of one facet of psychomotricity, namely the strength and agility expressed in a nonspecific (land-based) environment by junior III water polo players. The focus is on the application of two subtests, subtest 1 – Running speed and agility, and subtest 2 – Strength, which are part of the Bruininks-Oseretsky Test of Motor Proficiency, Second Edition. This test battery was applied to high-performance athletes who were in the sights of the national team and were basic members of their club teams. The athletes are born in 1997, play match by match and belong to Steaua School Sports Club 3 (national champion team) and Emil Racoviță Sports College (ranked 3rd in the national championship). The test was conducted on 7 August 2012 in the sports hall of UNEFS Bucharest. The results have shown that, out of the 24 tested athletes, 87% (21 athletes) fall into the average category, and 13% (3 athletes) fall into the above-average category. Mean composite scores are X = 47.25 points for the athletes from Emil Racoviță and X = 53.17 points for those from Steaua. The mean difference is 5.92 points (11.1%) in favour of Steaua athletes. This research has contributed to obtaining, through nonspecific (land-based) means, valuable information on the level of strength and agility of junior III water polo players, which is useful for coaches to introduce technical exercises in their training sessions in order to develop strength and agility under specific competitive conditions and the constant time pressure.

scholarly journals Ivermectin and albendazole withdrawal period in goat milk

2019 ◽  
Vol 20 ◽  
Author(s):  
Patrícia Silva Santos ◽  
Jurandir Ferreira da Cruz ◽  
José Soares dos Santos ◽  
Vanessa Daniele Mottin ◽  
Milton Rezende Teixeira Neto ◽  
...  
Keyword(s):  
High Performance ◽  
Goat Milk ◽  
Withdrawal Period ◽  
Milk Samples ◽  
Native Pasture ◽  
Before And After ◽  
The Mean ◽  
Antiparasitic Treatment

SUMMARY Theaimthis study was to determine the excretion profile of albendazole and ivermectin residues in milk from goats submitted to antiparasitic treatment. Twenty-four Brazilianmongrel lactating and pluriparous goats, maintained extensively on native pasture were orally treatedwith albendazole or ivermectin. Milk samples were collected before and after vermifuges application, in the days 0, 2, 3 e 4 to albendazole and 0, 3, 7, 14, 21, 28, 35 and 42 to ivermectin. The vermifuges residues were detected by high performance liquid cromatography with ultravioletdetector. The amount of residues contained in themilk was decreasing in function of time. The mean daily rates of decrease of albendazole residues were 63.34%, 40.18 and 100.0%, from the 2ndto the 4thday, respectively; on the 3rdday after treatment, 50% of the samples showed concentrations ≥ 47.61 μg.mL–1, and on the 4thday, no sample had albendazole residue. The amount excreted of ivermectin was similar between the 3rdand 21stday when all samples presented values ≥ 51.90 μg.mL-1; on the 35th day, 50% of the samples showed values above of recommended levels, and on the 42nd day, no sample had detectable ivermectin residue. In conclusion, the milk of Brazilian mongrel goats treated orally with albendazole or ivermectin does not contain its respective residues in detectable amounts from the 4th and 42nddays, respectively, after antiparasitic treatment.

Phase I trial of low-dose, prolonged continuous infusion fluorouracil plus interferon-alfa: evidence for enhanced fluorouracil toxicity without pharmacokinetic perturbation.

1993 ◽  
Vol 11 (8) ◽  
pp. 1609-1617 ◽  
Author(s):  
J A Sparano ◽  
S Wadler ◽  
R B Diasio ◽  
R Zhang ◽  
Z Lu ◽  
...  
Keyword(s):  
High Performance ◽  
Low Dose ◽  
Objective Response ◽  
Circadian Variation ◽  
Interferon Alfa ◽  
Pharmacokinetic Data ◽  
Ifn Alpha ◽  
Before And After ◽  
The Mean ◽  
Adenocarcinoma Of The Pancreas

PURPOSE To determine the maximum-tolerable dose (MTD) of fluorouracil (5-FU) administered as a low-dose, prolonged continuous intravenous infusion (PCI) plus interferon-alfa (IFN-alpha) that would permit treatment for at least 28 consecutive days, and to determine the effect of IFN-alpha on 5-FU pharmacokinetics. PATIENTS AND METHODS Twenty-six assessable patients with advanced cancer received low-dose PCI 5-FU (150, 200, 250, and 300 mg/m2/d) plus IFN-alpha, 5 x 10(6) IU/m2 administered subcutaneously (SC) at hour 48 of the 5-FU infusion, then thrice weekly thereafter in cohorts of at least three patients. Treatment continued until treatment-limiting toxicity (TLT) developed, such as mucositis, diarrhea, or fatigue. Escalation to the next 5-FU dose level occurred if none of three or zero to two of six patients developed TLT before day 28. Quantitation of plasma 5-FU concentration by high-performance liquid chromatography was performed in 15 patients. Data were standardized using the Cosinor method and compared before and after IFN-alpha administration using the paired t test. RESULTS The mean number of days of continuous 5-FU therapy for patients receiving 150, 200, 250, and 300 mg/m2/d of 5-FU plus IFN alfa-2a (IFN-alpha 2a) was 75, 54, 37, and 22 days, respectively. The MTD of PCI 5-FU by our criteria that could be combined with IFN-alpha was 250 mg/m2/d. Comparison of the standardized pharmacokinetic data showed no significant effect of IFN-alpha on plasma 5-FU concentration, and no alteration of the normal circadian variation in plasma 5-FU concentration that was evident before IFN-alpha administration. Objective response occurred in patients with adenocarcinoma of the pancreas (n = 3), kidney (n = 2), and lung (n = 1). CONCLUSION IFN-alpha substantially enhanced the gastrointestinal toxicity of low-dose PCI 5-FU without affecting 5-FU pharmacokinetics, contrary to previous reports using alternative 5-FU schedules in which IFN-alpha-related enhancement of 5-FU toxicity was attributable to reduced 5-FU clearance. Our findings suggest that under certain conditions, mechanisms other than altered 5-FU pharmacokinetics may be responsible for the ability of IFN-alpha to enhance the toxic effects of 5-FU.

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