Maximum Peak Velocity Research Articles

시대별 종단적 자료를 함수식으로 연구한 청소년의 최대 발육연령과 최대 발육속도 경향 : 1968년 ∼ 2019년을 기준으로

시대별 종단적 자료를 함수식으로 연구한 청소년의 최대 발육연령과 최대 발육속도 경향 : 1968년 ∼ 2019년을 기준으로

Pain Education and Virtual Reality Improves Pain, Pain-related Fear of Movement, and Trunk Kinematics in Individuals With Persistent Low Back Pain.

To evaluate the effect of combining pain education and virtual reality (VR) exposure therapy using a cognitive-behavioral therapy-informed approach (virtual reality-based cognitive behavioral therapy [VR-CBT]) on pain intensity, fear of movement, and trunk movement in individuals with persistent low back pain. Thirty-seven participants were recruited in a single cohort repeated measures study, attending 3 sessions 1 week apart. The VR-CBT intervention included standardized pain education (session 1) and virtual reality-based exposure therapy (VRET; session 2) incorporating gameplay with mixed reality video capture and reflective feedback of performance. Outcome measures (pain intensity, pain-related fear of movement (Tampa Scale of Kinesiophobia), and trunk kinematics during functional movements (maximum amplitude and peak velocity) were collected at baseline (session 1) and 1 week after education (session 2) and VRET (session 3). One-way repeated measures analysis of variances evaluated change in outcomes from baseline to completion. Post hoc contrasts evaluated effect sizes for the education and VR components of VR-CBT. Thirty-four participants completed all sessions. Significant ( P < 0.001) reductions were observed in mean (SD) pain (baseline 5.9 [1.5]; completion 4.3 [2.1]) and fear of movement (baseline 42.6 [6.4]; completion 34.3 [7.4]). Large effect sizes (Cohen d ) were observed for education (pain intensity: 0.85; fear of movement: 1.28), whereas the addition of VRET demonstrated very small insignificant effect sizes (pain intensity: 0.10; fear of movement: 0.18). Peak trunk velocity, but not amplitude, increased significantly ( P < 0.05) across trunk movement tasks. A VR-CBT intervention improved pain, pain-related fear of movement, and trunk kinematics. Further research should explore increased VR-CBT dosage and mechanisms underlying improvement.

Investigations of the Mass Transfer and Flow Field Disturbance Regulation of the Gas–Liquid–Solid Flow of Hydropower Stations

With the continuous depletion of fossil fuels, all countries attach importance to clean and sustainable development. The real-time state monitoring of multiphase flows is vital for enhancing hydropower station energy conversion. However, the material mass transfer mechanism and flow field disturbance regulation strategy faces significant challenges. To solve these problems, a computational fluid mechanics and discrete element method (CFD-DEM) coupling modeling and solution method based on a particle porosity model was proposed, and the mass transfer mechanism of gas–liquid–solid mixing flows was obtained under dynamic whirl intensity regulations. Combined with the user-defined function (UDF), the interphase forces and void ratios of fluids and particles were calculated to obtain the material mass transfer laws under dynamic disturbance regulations. The evolution characteristics of the particle flow pattern were tracked during the material mixing process. The results show that the mixed flow field had a high material transport efficiency under intensive whirl regulation, especially for the particle aggregation in the center of the reaction vessel. The maximum peak velocity and energy values of the particle transport process were 3.30 m/s and 0.27 × 10−3 m2·s−2. The higher whirl regulation improved the material transport process and conveying efficiency and enhanced the particle mixing effect in the reaction space. Relevant research results can provide theoretical references for material mass transfer mechanisms, dynamic regulation strategies, and particle flow pattern identifications and can also provide technical support for hydropower energy conversion.

Intermittent Voluntary Isometric Contractions Effects on Performance Enhancement and Sticking Region Kinematics in the Bench Press.

During the last years, post-activation performance enhancement (PAPE) has gained notorious popularity due to the capacity to improve the acute rate of force development (RFD) using different strategies with different muscle contraction regimes as conditioning stimuli. The aim of the present study was to analyse the role of a maximal isometric post-activation performance enhancement (PAPE) protocol in performance and its effects on the kinematics of the sticking region. Twenty-one trained participants (age 26.4 ± 5.4 years) underwent two experimental sessions: an experimental session consisting of a single set and a single repetition of the bench press at the 93% of 1RM (which is considered a traditional conditioning activity to induce PAPE) (TRAD) and an isometric experimental session (ISO) consisting of 15 maximal voluntary isometric contractions in the sticking region of the medium grip bench press lasting 1 s with a 1 s rest interval between contractions. Both TRAD and ISO experimental conditions improved performance from post0 to post4, post8, post12 and post16, but only the ISO condition improved performance from the start of the lift to the start of the sticking region from pre to post (p < 0.001), and only the ISO condition improved maximum (p = 0.005) and minimum (p = 0.025) peak velocities. The results of this study suggest that short duration maximal voluntary isometric contractions improve the velocity of the lift prior to the initiation of the sticking region, which ultimately improves the impulse and facilitates the lift.

Assessing the impact of hyperviscosity on stenosis shape in COVID patients

Recent studies have proven that the shape of the stenosis greatly affects the flow characteristics. The 2D rigid wall model examined in this research is analyzed mathematically using various principles and results of functional analysis for the existence and uniqueness of the solution. The model taken into consideration for the current study has also been used to examine the consequences of hyperviscosity in COVID-19 cases. The results of the investigation surmise that the maximum peak velocity of 3.155m/s and the minimum trough pressure of 7041.538Pa were manifested in the high slope geometry. Also, the number of spots over the upper wall of high slope geometry bearing the least wall shear stress was considerably high when compared to the other geometries. The study deduced that the arterial segment bearing dual high slope stenosis was more susceptible to new plaques, plaque ruptures, and hyper viscous syndrome.

Comparison of portal vein hemodynamics with ultrasound-based elastography for the prediction of liver fibrosis in patients with chronic liver disease

Chronic liver disease includes nonalcoholic fatty liver disease, progresses from steatosis and hepatitis to fibrosis and cirrhosis, with hemodynamic changes in portal blood flow. This study aimed to compare portal vein hemodynamics with liver stiffness (LS) and steatosis and included 28 subjects with chronic liver disease, in whom LS and steatosis were evaluated in the same image employing two elastography techniques: transient elastography (TE) with controlled attenuation parameter (CAP) using a FibroScan and two-dimensional shear-wave elastography (2D-SWE) with attenuation imaging (ATI). Additionally, peak maximum velocity (Vmax) of the right portal vein and spleen stiffness with 2D-SWE were evaluated. A strong positive correlation was present between LS values obtained with TE and 2D-SWE and between the attenuation coefficients of steatosis obtained with CAP and ATI. Additionally, a negative correlation was present between LS values and the Vmax of the right portal vein (r = 0.415, p = 0.031). The optimal Vmax cutoff value for discriminating liver fibrosis with an LS value of > 5 kPa was < 17 cm/s; the ability of Vmax to predict fibrosis was comparable to that of the FIB4-index. Low Vmax of the right portal vein was useful for identifying liver fibrosis in patients with chronic liver disease.

Repeatability and reproducibility of various 4D Flow MRI postprocessing software programs in a multi-software and multi-vendor cross-over comparison study

BackgroundDifferent software programs are available for the evaluation of 4D Flow cardiovascular magnetic resonance (CMR). A good agreement of the results between programs is a prerequisite for the acceptance of the method. Therefore, the goal was to compare quantitative results from a cross-over comparison in individuals examined on two scanners of different vendors analyzed with four postprocessing software packages. MethodsEight healthy subjects (27 ± 3 years, 3 women) were each examined on two 3T CMR systems (Ingenia, Philips Healthcare; MAGNETOM Skyra, Siemens Healthineers) with a standardized 4D Flow CMR sequence. Six manually placed aortic contours were evaluated with Caas (Pie Medical Imaging, SW-A), cvi42 (Circle Cardiovascular Imaging, SW-B), GTFlow (GyroTools, SW-C), and MevisFlow (Fraunhofer Institute MEVIS, SW-D) to analyze seven clinically used parameters including stroke volume, peak flow, peak velocity, and area as well as typically scientifically used wall shear stress values. Statistical analysis of inter- and intrareader variability, inter-software and inter-scanner comparison included calculation of absolute and relative error (ER), intraclass correlation coefficient (ICC), Bland–Altman analysis, and equivalence testing based on the assumption that inter-software differences needed to be within 80% of the range of intrareader differences. ResultsSW-A and SW-C were the only software programs showing agreement for stroke volume (ICC = 0.96; ER = 3 ± 8%), peak flow (ICC: 0.97; ER = −1 ± 7%), and area (ICC = 0.81; ER = 2 ± 22%). Results from SW-A/D and SW-C/D were equivalent only for area and peak flow. Other software pairs did not yield equivalent results for routinely used clinical parameters. Especially peak maximum velocity yielded poor agreement (ICC ≤ 0.4) between all software packages except SW-A/D that showed good agreement (ICC = 0.80). Inter- and intrareader consistency for clinically used parameters was best for SW-A and SW-D (ICC = 0.56–97) and worst for SW-B (ICC = -0.01–0.71). Of note, inter-scanner differences per individual tended to be smaller than inter-software differences. ConclusionsOf all tested software programs, only SW-A and SW-C can be used equivalently for determination of stroke volume, peak flow, and vessel area. Irrespective of the applied software and scanner, high intra- and interreader variability for all parameters have to be taken into account before introducing 4D Flow CMR in clinical routine. Especially in multicenter clinical trials a single image evaluation software should be applied.

Composition of Delayed Age at MPV of Weight Due to Unnatural Weight Gain

Age at maximum peak velocity (MPV) of weight may be affected by environmental factors that cause a gap with the age at MPV of height and a delay. However, the actual situation is not clear. In this study we analyzed the shift in the age at MPV in weight caused by the difficult, stressful environment following the Great East Japan Earthquake, based on the relationship between the ages at MPV of weight and height, which is thought to be a mechanism of natural growth We also verified the mechanism of unnatural weight gain caused by the stress of the earthquake. We then determined the individual shift in the age at MPV of weight in a disaster group from a regression polynomial analysis of the age at MPV of weight against the age at MPV of height and examined the distribution state of the determined shifts. In this way, we derived evidence that the age at MPV of weight was shifted relative to the MPV age of height in girls in Fukushima Prefecture in the disaster group. This demonstrated that the effects from the Fukushima Prefecture nuclear power plant disaster were large, and also that there was a tendency for unnatural weight gain in junior high school girls in the region of Fukushima.

Confirmation regarding regression polynomial evaluation of age at menarche against age at MPV of weight

Based on the regression evaluation of menarcheal age relative to the age at MPV of height, a delayed menarche evaluation chart was established. In fact, it is thought that the close relationship between menarche and body weight may lie behind the critical weight hypothesis and body fat hypothesis proposed in relation to the onset of menarche. In other words, the age at maximum peak velocity (MPV) in weight and age at menarche are thought to be highly correlated, so a regression evaluation chart for age at menarche against age at MPV of height can be constructed. Then, in the present study, a delayed menarche evaluation chart based on age at MPV of weight is constructed, and compared it with evaluations of delayed menarche determined by age at MPV of height. The results showed that the age at MPV of weight is later than the age of MPV in height. The level of agreement between girls judged using delayed menarche evaluation charts based on ages at MPV of height and weight was analyzed, and the results showed agreement in 131 of 204 girls (64.2%). The fact that there was disagreement in 74 girls (35.8%) indicates that the validity of delayed menarche evaluation based on age at MPV of weight is probably low.

비선형 회귀식을 활용한 청소년 체격의 최대 발육연령과 최대 발육속도의 종단적 연구

The purpose of this study was to investigate and analyze the maximum peak age(MPA) and maximum peak velocity(MPV) by using a polynomial expression with value of function from youth physique using nonlinear regression equation. For the completion of this study through longitudinal study, we sorted with BMI on youth physique in C city, Gyeonsangnam-do. Total of 959 students(553 males and 406 females) participated in this study. We collected data for 12 years from 1st grade(age 6) attending the elementary school in 2001 to 12<SUP>th</SUP> grade(age 17) attending the high school. We used SPSS PC/Program(version 25.0) and sort three groups (underweight, normal, obesity). We also differentiated height and weight from male and female students with Origin Lab software (version Pro) by calculating the value of function through polynomial fitting and drew the graph. The results are followings. First, for the development and growth from the height of male students, it showed that MPA(age 11.78) and MPV(6.51cm/year) in the underweight group were the highest than other groups whereas MPH(maximum peak height)(154.43cm) was the highest than other groups in the obesity group. Second, for the development and growth from the height of female students, it showed that MPA(age 10.01) and MPV(4.83cm/year) in the underweight group were the highest than other groups in the underweight group whereas MPH(144.84cm) was the highest than other groups in the normal group. Third, for the development and growth from the weight of male students, it showed that MPA(age 12.75) was the highest than other groups in the underweight group. MPW(maximum peak weight)(58.81kg) and MPV(6.17kg/year) in the obesity group were the highest than other groups. Lastly, for the development and growth from the weight of female students, it showed that MPA(age 9.49), MPW(43.97kg) and MPV(5.01kg/year) in the obesity group were the highest than other groups.

Validity for General Type Model Based on Fujimmon Growth Curve

Fujimmon's growth curve was proposed by Fujii[1], but unlike Scammon's growth curve, three growth patterns were set. Moreover, Scammon's growth curve was drawn freehand, but Fujimmon's growth curve is drawn by a wavelet interpolation model. The growth curve for each type is clearly independent, but no essential classification criteria were discussed. Here an attempt is made to examine indicators that could be classification criteria for the general growth type, from the fact that among human attributes many internal organs are classified as having the general growth pattern. The wavelet interpolation model was applied to the growth distance values for attributes classified as the general growth pattern, for example internal organs and morphological elements, and the maximum peak velocity (MPV) was derived from the described growth velocity curve. With the ability to calculate the MPV, it was demonstrated that the growth distance curves of various attributes show a sigmoid curve. The age at MPV was then compared between several organs that showed sigmoid curves, and the variability between different sexes and in the same sex was investigated. The results for differences between the sexes showed a trend for later age at MPV in various organs in girls. A relationship between the level of maturity and the variability in the age at MPV in people of the same sex may be suggested.

Scale Model Experiment on Local Scour around Submarine Pipelines under Bidirectional Tidal Currents

In nearshore regions, bidirectional tidal flow is the main hydrodynamic factor, which induces local scour around submarine pipelines. So far, most studies on scour around submarine pipelines only consider the action of unidirectional, steady currents and little attention has been paid to the situation of bidirectional tidal currents. To deeply understand scour characteristics and produce a more accurate prediction method in bidirectional tidal currents for engineering application, a series of laboratory scale experiments were conducted in a bidirectional current flume. The experiments were carried out at a length scale of 1:20 and the tidal currents were scaled with field measurements from Cezhen pipeline in Hangzhou Bay, China. The experimental results showed that under bidirectional tidal currents, the scour depth increased significantly during the first half of the tidal cycle and it only increased slightly when the flow of the tidal velocity was near maximum flood or ebb in the following tidal cycle. Compared with scour under a unidirectional steady current, the scour profile under a bidirectional tidal current was more symmetrical, and the scour depth in a bidirectional tidal current was on average 80% of that under a unidirectional, steady current based on maximum peak velocity. Based on previous research and the present experimental data, a more accurate fitted equation to predict the tidally induced live-bed scour depth around submarine pipelines was proposed and has been verified using field data from the Cezhen pipeline.

Parametric study on active flow control of a transonic axial compressor rotor using endwall synthetic jet

High-load axial compressor is the mainstream of current compressor design and development. In order to improve the aerodynamic performance of high-load axial compressor, an active flow control method in which a synthetic jet is applied to the endwall is proposed. Taking the transonic axial compressor NASA Rotor 35 as the research object, using a single factor analysis method, the influence of five different excitation positions, three different excitation frequencies, and three different jet peak velocities on the aerodynamic performance of the compressor was studied in turn, and obtained the influence law of the endwall synthetic jet excitation parameters. The results show that all three parameters have important effects on the performance of the compressor. Among the excitation parameters studied in this paper, there is an optimal excitation position of 25% Ca. When excited at this position, the flow margin of the compressor is expanded the most. On the basis of maintaining the optimal excitation position and the maximum jet peak velocity, the calculation results found that the jet frequency has little effect on the compressor’s near stall flow rate, but has a great impact on the total pressure ratio and efficiency. The pressure ratio and efficiency increase with the increase of the excitation frequency. However, there seems to be a threshold of the excitation frequency. Only when the excitation frequency is greater than the threshold can the total pressure ratio and efficiency be higher than the prototype compressor. The jet peak velocity has the smallest impact on the compressor performance. Based on the optimal excitation position and the excitation frequency exceeding the threshold, even if the jet peak velocity is small, the compressor can obtain a higher flow margin, total pressure ratio, and efficiency than the prototype compressor. As the jet peak velocity increases, the performance of compressor can be further improved.

Carotid vs. aortic velocity time integral and peak velocity to predict fluid responsiveness in mechanically ventilated patients. A comparative study.

The carotid artery velocity-time integral (<inf>C</inf>VTI) and the carotid Doppler peak velocity (cDPV), as well as measures of their variation induced by the respiratory cycle, have been proposed as fast and easy to obtain ultrasound measures for assessing fluid responsiveness in intensive care unit patients. To investigate this possibility, we conducted a prospective observational study in hemodynamically unstable patients under mechanical ventilation. From May 1 to December 31, 2019, we conducted a prospective observational study involving 50 hemodynamically unstable patients under mechanical ventilation. We obtained a total of 800 Doppler ultrasound measurements from the left common carotid artery and at the level of the aortic annulus in the apical five-chamber view. The two measurements were performed before and after a 7 mL/kg fluid challenge and within the first hour of the onset of hemodynamic instability. The maximum Doppler peak velocity, the minimum Doppler peak velocity, and the maximum and minimum VTI at both the aortic and carotid level were acquired. Twenty-eight (56%) patients showed a ≥15% increase in <inf>Ao</inf>VTI after the fluid challenge, and were therefore identified as "fluid responders". All Doppler measurements were always significantly greater (P<0.0001) in fluid responders in relation to both carotid and aortic parameters. Good agreement between the above-mentioned measurements was found: Cohen's kappa coefficient between the carotid and aortic ΔDPV was 0.76 (95% CI 0.58-0.94); and between the Carotid and Aortic ΔVTI it was 0.84 (95% CI 0.68-0.99). <inf>C</inf>DPV was found to predict fluid responsiveness in unstable mechanically ventilated patients.

Molecular dynamics study of self-propelled droplet on different surfaces

To provide a microscopic view of droplet self-propelled behavior, droplet movement on surfaces with different parameters (wettability gradient, gradient zone angle, conical micro/nano structure) using molecular dynamics simulation (MDS) were studied. The result shows that both surface wettability gradient and the conical structure can induce the droplet movement. The moving velocity increases as the wettability gradient increases, generally a higher velocity prevails for hydrophobic surface at the same wettability gradient. The maximum peak velocity is observed at the conical angle of around 40°, and the velocity does not show much difference at different wettability of the conical structure.

Portal venous and hepatic artery hemodynamic variation in non-alcoholic fatty liver disease

BackgroundNon-alcoholic fatty liver disease remains asymptomatic until advanced disease, when risk factor modification and available treatment become no longer effective. Studies on hepatic vasculature can be informative about parenchymal injury and disease severity through the study of changes affecting vascular compliance. This study aimed to study portal vein and hepatic artery hemodynamic variation in non-alcoholic fatty liver and to correlate it with disease severity.ResultsThis case control study included 80 participants; those were further divided into four groups; healthy volunteers and non-alcoholic fatty liver disease patients’ grade 1, 2, and 3. We did anthropometric measures, laboratory tests, transient elastography, and Doppler ultrasound for all participants, and then we collected the data and analyzed it using SPSS version 25.Doppler findings showed that peak maximum velocity, peak minimum velocity, mean flow velocity, portal vein pulsatility index of portal vein, and hepatic artery resistivity index were significantly lower in non-alcoholic fatty liver disease patients than in healthy people. All indices were indirectly proportionate to the grade of the disease except for peak minimum velocity which was significantly lower on comparing grade 3 patients with grades 1 and 2 patients.ConclusionsReduction of portal flow and increase in hepatic artery flow in fatty liver correlates with disease severity and can help as a non-invasive measure in diagnosis and grading of non-alcoholic fatty liver disease.

Optimal functional surface coating considering internal flow behavior of viscous-liquids driven by vertical ultrasonic waves

In ultrasonic vibration-assisted coatings, the verification of the surface roughness formation induced by the internal waves and the investigation of the maximum roughness position play a very important role and significantly contribute to the development of coating technology and to the comprehension of the induced internal flows. Therefore, this study aimed to verify the roughness formation process and to investigate the relationship between the liquid film thickness, the initial viscosity, and the applied frequency in order to fabricate the functional surface with the maximum hydrophobicity or hydrophilicity. A two-dimensional (2-D) numerical approach using a moving-mesh and non-Newtonian model with a multi-physics program (COMSOL) was applied to investigate the dynamic behavior, the velocity profile and the surface roughness of internal flow. Also, experiments were performed to investigate the existence and position of the maximum peak velocity using scanning electron microscopy (SEM) images and measured surface-roughness data. It was concluded that the surface roughness generated by the initial viscosity was remained despite increased viscosity when the ultrasonic vibration was applied for a long time. The developed velocity profile had a velocity gradient overshoot and the maximal internal flow velocity developed at the thickness of about 1.2-fold of the viscosity boundary layer edge. The applied frequency, thickness of the film and initial viscosity dominantly affect the position of maximum peak velocity related to the viscous boundary layer and the performance of the liquid film coating.

Dynamic postural control correlates with activities of daily living and quality of life in patients with knee osteoarthritis

BackgroundKnee osteoarthritis (OA) negatively affects dynamic postural control, which is a basic function that individuals use to perform activities of daily living (ADL). The purpose of this study was to investigate the associations of center of pressure (COP) control during the transition from double-leg to single-leg standing with subjective assessments of ADL and quality of life (QOL) in patients with knee OA.MethodsThirty-six patients (29 females) with moderate-to-severe knee OA participated. Dynamic postural control was evaluated during the transition from double-leg to single-leg standing. Each patient stood on a force plate, lifted the less affected limb as fast as possible, and maintained single-leg standing with the more affected limb. The COP movements corresponding to anticipatory postural adjustment (APA) and transitional phases were assessed. The maximum displacement and peak velocity of the COP movements in the medial–lateral direction were calculated. The Knee Injury and Osteoarthritis Outcome Score (KOOS) was used for the subjective assessment of ADL and QOL. Pearson’s product correlation analysis was performed to investigate the associations of COP movements in the APA and transitional phases with KOOS-ADL and KOOS-QOL.ResultsIn the APA phase, the maximum COP displacement was significantly correlated with KOOS-ADL (r = -0.353, P = 0.035) and KOOS-QOL (r = -0.379, P = 0.023). In the transitional phase, the maximum COP displacement and peak COP velocity were significantly correlated with KOOS-ADL (maximum displacement: r = 0.352, P = 0.035; peak velocity: r = 0.438, P = 0.008) and with KOOS-QOL (maximum displacement: r = 0.357, P = 0.032; peak velocity: r = 0.343, P = 0.040).ConclusionsThe present study showed that smaller COP movements in the APA phase and smaller and slower COP movements in the transitional phase correlated with poorer ADL and QOL conditions in patients with knee OA. These findings suggest that poor dynamic postural control is associated with poor ADL and QOL conditions in patients with moderate-to-severe medial knee OA. Conservative treatment for patients with knee OA may need to focus on dynamic postural control during the transition from double-leg to single-leg standing.

Optimal Training Sequences to Develop Lower Body Force, Velocity, Power, and Jump Height: A Systematic Review with Meta-Analysis.

Resistance training has been used to enhance a range of athletic abilities through correct manipulation of several variables such as training load, training volume, set configuration, and rest period. The aim of this systematic review and meta-analysis was to compare the acute and chronic responses of lower body cluster, contrast, complex, and traditional training across a range of athletic performance outcomes (1-repetition maximum squat strength, jump height, peak power, peak force, peak velocity, and sprint time). A database search was completed (SPORTDiscus, Medline and CINAHL) followed by a quality scoring system, which concluded with 41 studies being used in the meta-analysis. Effect sizes were calculated for acute and training intervention changes compared to baseline. For acute cluster training, effect sizes were used to represent differences between equated traditional and cluster sets. Acutely, contrast and cluster training can be implemented to enhance and maintain velocity. Complex training does not acutely show a performance-enhancing effect on jump performance. When looking to develop exercise-specific force, the exercise should be completed closer to set failure with fewer repetitions still able to be completed, which can be achieved using complex or high-volume contrast training to pre-fatigue the lighter exercise. When the objective is to improve velocity for the target exercise, it can be combined with a heavier contrast pair to create a postactivation performance enhancing effect. Alternatively, cluster set designs can be used to maintain high velocities and reduce drop-off. Finally, traditional training is most effective for increasing squat 1-repetition maximum.

Effects of Arteriovenous Thrombolysis Combined with Mechanical Thrombectomy on Efficacy and Neurological Function of Acute Cerebral Infarct Patients.

Objective To investigate the effects of arteriovenous thrombolysis combined with mechanical thrombectomy on clinical efficacy, neurological function, and the changes of nerve injury markers of acute cerebral infarct (ACI) patients. Methods A total of 143 cases with ACI admitted to our hospital from June 2017 to June 2019 were elected as research subjects. Among them, 69 cases of patients who received treatment of arteriovenous thrombolysis were considered as group A, and 74 cases of patients who received treatment of arteriovenous thrombolysis combined with mechanical thrombectomy were considered as group B. NIHSS score, clinical efficacy, vascular recanalization, adverse reactions, hemodynamics, neurological injury indexes, duration of coma, length of hospital stay, and prognosis of patients in the two groups were compared. Results After treatment, the NIHSS score of group A was higher than that of group B (P < 0.05), the clinical efficacy of group B was better than that of group A, and the incidence of adverse reactions was lower than that of group A (P < 0.05). There was no difference in vascular recanalization rate, duration of coma, and prognosis between the two groups (P > 0.05). Length of hospital stay, maximum peak velocity after treatment (Vs), and mean flow rate (Vm) of group A were lower than those of group B, while vascular resistance index (RI), pulsatility index (PI), serum glutamic acid (Glu), neuron-specific enolase (NES), and S100β protein detected by enzyme-linked immunosorbent assay (ELISA) of group A were higher than those of group B (P < 0.05). Conclusion Arteriovenous thrombolysis combined with mechanical thrombectomy has a significant effect on ACI, with high safety and quick effect. In addition, it has a stronger effect on improving and protecting the neurological function of patients, which is worth promoting in clinical practice.