EFFECT OF PLYOMETRIC TRAINING PROGRAM ON ATHLETIC PERFORMANCE IN YOUNG TAEKWONDO ATHLETES

The aim of this study is to examine the effect of plyometric training program on athletic performance in young male taekwondo players. 20 volunteer male taekwondo athletes between the ages of 17-22 who regularly practice taekwondo participated in our study. Two different groups were formed as 10 athletes as experimental group and 10 athletes as control group. A plyometric training program was applied to the experimental group 3 days a week for 8 weeks. During the study, both groups continued their normal taekwondo training. The subjects were explained in detail how the study would be carried out. During the study, they were asked not to use diet or nutritional supplements and not to do separate exercises. The body weight, height, body mass index (BMI), body fat percentage (BFP), anaerobic power, back strength, hand grip strength, speed and flexibility values of the participating athletes were measured before starting the plyometric training program and after the training was completed. SPSS 22.0 program was used for statistical analysis. Paired Samples T-Test was used for in-group comparisons. Statistical results were evaluated at p<0.05 significance levels. Anaerobic power, BFP, vertical jump, back strength, hand grip strength right, hand grip strength left, speed and flexibility values of the experimental group were found to be significant at p<0.05 level. Only flexibility values of the control group were found to be significant at p<0.05 level. As a result, it can be said that the 8-week plyometric training program has a positive effect on the athletic performance of taekwondo athletes.  Article visualizations

Evaluation of hearing and cochlear function by audiometric testing in patients with hyperemesis gravidarum

INTRODUCTION: The aim of this study was to investigate cochlear functions in patients with hyperemesis gravidarum (HG).METHODS: Twenty-nine HG patients (58 ears) and 31 healthy control subjects (62 ears) were included. Audiometry testings at 250 and 500 Hz and 1, 2, 4, 8, 10, 12, 14, 16 kHz were performed to the patients and controls.RESULTS: Mean age of patients with HG was 26,5 ± 4,4 years and the mean age of control group was 28,0 ± 4,2 years. At the time of the tests mean gestational age of the HG group and controls were 9 and 11 weeks respectively. No differences were observed between the groups in tympanic membrane status, or other otolaringological evaluations. No significant differences were observed in audiometric tests at any frequencies between the groups (p values for all > 0.05).CONCLUSION: There was not a difference between pregnant cases with HG and cases with normal pregnancy in terms of audimetric tests. Cochlear functions are not affected remarkably in women with HG

Audit Firm Tenure and Audit Quality Implied by Discretionary Accruals and Modified Opinions: Evidence from Turkey

Accounting scandals and bankruptcies across the world have raised concerns about the financial statement audit quality. Though, prior results documented mixed results, some argue that auditors become more familiar with the client and therefore independence is impaired when audit firm tenure gets longer. Consequently, some regulators set a limit on the number of years an audit firm may audit the same client. This study examines the association between audit firm tenure and audit quality in Turkey. We used three measures to proxy audit quality such as propensity to issue modified audit reports and discretionary accruals determined by two models.  We found some evidence that audit quality does not increase with limited audit firm tenure. Given the additional costs associated with audit switch, it is concluded that there are minimal benefits of mandatory firm rotation. The results of this study will be useful for the regulators who are in charge to improve the audit quality. &nbsp

Afyonkarahisar–Ömer–Gecek–Gazlıgöl jeotermal suları ile emprenyeli karaçam (P. nigra Arnold.) ve kızılçam (P. brutia Ten.) diri odunlarında bazı özelliklerin incelenmesi

Çalışmada, bazı jeotermal suların emprenye maddesi potansiyeli ve bu sularla emprenyeli ahşapta çözelti absorpsiyonu, net kuru madde, teğet yönde şişme ve çekme miktarları araştırılmıştır. Araştırmada, Afyonkarahisar-Ömer (AF-23)-Gecek (R-260)-Gazlıgöl (GZL-1) jeotermal suları, karaçam (Pinus nigra Arnold.) ve kızılçam diri odunları (Pinus brutia Ten.), basit daldırma yöntemi ve saf su kullanılmıştır. Emprenye ve test işlemleri, laboratuvarda normal oda şartlarında gerçekleştirilmiştir. Sonuçta, Ömer, Gecek ve Gazlıgöl jeotermal suları için, emprenye maddesi derişimi, sırasıyla, %0,45, %0,47 ve %0,13 olarak saptanmıştır. İstatistiki olarak, jeotermal suların, absorpsiyon ve net kuru madde üzerindeki etkileri anlamlı çıkarken, teğet yönde şişme ve çekme üzerindeki etkileri anlamsız çıkmıştır. En yüksek absorpsiyon ve net kuru madde, Gecek jeotermali ile emprenyeli örneklerde bulunmuştur. Jeotermal sular ile emprenyeli örneklerin teğet yönde şişme ve çekme miktarları, saf su ile muamele edilmiş örneklerdeki ile hemen hemen aynı oranda gerçekleşmiştir. Anahtar kelimeler: Ahşap, Ağaç malzeme, Emprenye, Jeotermal, Afyonkarahisa

Kütahya–Simav yöresi jeotermal sularının emprenye maddesi potansiyeli ile ahşaptaki absorpsiyon, retensiyon ve yoğunluk üzerine etkilerinin belirlenmesi

Kütahya, jeotermal sularca zengin illerimizden biridir. İlde, sıcaklığı 30°C’nin üzerinde, 11 adet jeotermal saha vardır. Bu sahalardan biri de Simav yöresidir. Yöredeki jeotermal kaynaklar, kimyasal tuz / mineral madde bakımından zengindir. Çalışmada, Simav yöresi jeotermal sularının emprenye maddesi potansiyeli ile ahşaptaki absorpsiyon, retensiyon ve yoğunluk üzerine etkilerinin belirlenmesi amaçlanmıştır. Araştırmada Eynal, Çitgöl ve Naşa jeotermal suları, kızılçam (Pinus brutia Ten.) ve karaçam (Pinus nigra Arnold.) diri odun örnekleri ile basit daldırma yöntemi kullanılmıştır. Sonuçta, yöredeki jeotermal sular, geleneksel ahşap emprenye maddelerinin içeriğinde bulunan 10 – 13 adet kimyasal maddeye sahiptir. Bu maddelerin derişimi 748,61 mg/lt – 1244,01 mg/lt arasında değişmektedir. Bu sularla emprenye edilen ahşaptaki absorpsiyon, retensiyon ve yoğunluk değerleri, jeotermal kaynak derişimine bağlı olarak artmıştır. İstatistiksel olarak, absorpsiyon ve retensiyon üzerinde jeotermal kaynak türü, yoğunluk üzerinde ise ağaç türü önemli derecede büyük düzeyli bir etki yapmıştır. Bahsedilen özellikler için, ortalama en yüksek değer, kızılçamda Eynal kaynağı ile emprenyede, en düşük değer ise karaçamda Naşa kaynağı ile emprenyede bulunmuştur. Anahtar kelimeler: Kütahya, Simav, Ahşap, Ağaç malzeme, Jeotermal, Empreny

The minimum effective concentration (MEC90) of bupivacaine for an ultrasound-guided suprainguinal fascia iliaca compartment block for analgesia in knee surgery: a dose-finding study

Background: In recent years, the suprainguinal fascia iliaca compartment block (SFICB) has become more common in clinical practice. This assessor-blinded dose-finding study aimed to determine the minimum effective concentration (MEC90, MEC95) of bupivacaine for a single-injection SFICB in patients undergoing arthroscopic anterior cruciate ligament repair. Methods: This prospective study was conducted at a tertiary hospital (postoperative recovery room and ward). The SFICB was performed as a postsurgical intervention after spinal anesthesia. Seventy patients were allocated using the biased-coin design up-anddown sequential method. The ultrasound-guided SFICB was performed using different bupivacaine concentrations, and standard multimodal analgesia was administered to all patients. Block success was defined as the absence of pain or presence of only tactile sensation during the pinprick test conducted on the anterior and lateral regions of the midthigh six hours postoperatively. Results: According to isotonic regression and bootstrap CIs, the MEC90 value of bupivacaine for a successful SFICB was 0.123% (95% CI [0.098, 0.191]) and the MEC95 value was 0.188% (95% CI [0.113, 0.223]). Conclusions: Our study showed that the MEC90 and MEC95 values for bupivacaine administered via an SFICB for analgesia were 0.123% and 0.188%, respectively. One advantage of using lower concentrations of bupivacaine is the associated reduction in quadriceps weakness

Jute and luffa fiber-reinforced biocomposites: Effects of sample thickness and fiber/resin ratio on sound absorption and transmission Loss Performance

The acoustic properties of natural fiber-reinforced composites should be identified before using these materials in various engineering applications including sound and vibration isolation. This study investigates the effects of sample thickness and fiber/resin ratio on the acoustic performance of jute and luffa fiber-reinforced biocomposites. For this purpose, jute and luffa composite samples with different thicknesses and fiber/epoxy ratios are manufactured and their sound absorption coefficients (SACs) and transmission losses (TLs) are determined using impedance tube method. Thickness-dependent tendencies of the SACs and TLs of jute and luffa composites for low-, medium-, and high-frequency ranges are identified. The effect of fiber/epoxy ratio on the acoustic properties of jute and luffa composites as a function of frequency are determined. Furthermore, the SACs and TLs of some natural fiber-based samples with different thicknesses are predicted using mathematical models and the theoretical and experimental results are compared and evaluated.TUBITAK (The Scientific and Technological Research Council of Turkey) under Grant 119M115.WOS:000638569100001Scopus - Affiliation ID: 60105072Science Citation Index ExpandedQ1Article; Early AccessUluslararası işbirliği ile yapılmayan - HAYIRNisan2021YÖK - 2020-2

QUANTITATIVE EMPLOYMENT OF SUBJECTIVE COMPLAINTS IN CARPAL TUNNEL SYNDROME DIAGNOSIS

Amaç: Karpal tünel sendromu (KTS) en sık görülen tuzak nöropati olması ve tanısında elektrofizyolojik incelemenin kullanılmasından dolayı, elektromiyografi (EMG) laboratuarlarına gönderilen hastalar içinde en büyük grubu oluşturmaktadır. Bu çalışmada, KTS öntanısı ile kliniğimizin EMG laboratuvarına gönderilen hastaların subjektif yakınmalarının Boston Karpal Tünel Sendromu Anketi (BKTSA) kullanılarak skorlanması, bu skorlar ile elektrofizyolojik bulgular arasındaki ilişkinin değerlendirilmesi hedeflenmiştir. Gereç ve yöntem: Çalışmaya Haziran-Eylül döneminde anabilim dalımızın EMG laboratuvarına KTS ön tanısı ile gönderilen 76 hasta ve 30 sağlıklı gönüllü alındı ve elektrofizyolojik incelemeler 212 elde yapıldı. Bulgular: Yetmiş altı hastanın 30'unda elektrofizyolojik olarak KTS saptandı. Elektrofizyolojik olarak KTS saptanan ve saptanmayan grupların sübjektif yakınmalarını değerlendiren BKTSA sonuçları arasında anlamlı fark olduğu görüldü (p %50 spesifiteye sahip olduğu görülmüştür. Sonuç: KTS'de subjektif yakınmaların değerlendirildiği BKTSA ile elektrofizyolojik bulgular arasında kuvvetli bir korelasyon mevcuttur. Elektrofizyolojik inceleme öncesi bu kısa ve güvenilir anketin uygulanması ile doğru tanı oranı arttırılarak zamansal ve ekonomik kayıplar azaltılabilir. Objective: Carpal tunnel syndrome (CTS) constitutes the largest group of the patients referred to electromyography laboratories (EMG), since it is the most frequent entrapment neuropathy and electrophysiologic investigation is being employed for its diagnosis .In this study, we are aiming to decrease the number of the electrophysiological investigation demands by application of Boston Carpal Tunnel Syndrome Questionnaire (BCTSQ). Material and method: 76 patients referred to Neurology Department of Dokuz Eylül University Medical Faculty with suspect CTS and 30 healthy volunteers were included in our study between June October 2003. Electrophysiologic investigations were done 212 hands totally. Results: CTS was detected electrophysiologically in 30 patients of 76. A significant difference (p %50 specificity for the CTS prediagnosis. Conclusion: There is a strong correlation between the BCTSQ scores assessing the subjective scores and electrophysiologic findings for CTS. Prior to the electrophsiologic investigation, application of this simple and reliable questionnaire reduces the economic and time losses by increasing the rate of true diagnosis

Twıp Çeliklerinin Debriyaj Kapağı Rijitlik Davranışlarının İncelenmesi

Konferans Bildirisi-- İstanbul Teknik Üniversitesi, Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2017Conference Paper -- İstanbul Technical University, Theoretical and Applied Mechanical Turkish National Committee, 2017Bu çalışmanın amacı kuru kavramalı debriyajlarda sıkça kullanılan endüstriyel çeliklere alternatif olarak son yıllarda otomotiv sektöründe talep görmeye başlayan TWIP980 çeliğinin debriyajlarda kullanılmasının incelenmesi ve çalışma koşulları altında debriyaj kapaklarının rijitlik farkının karşılaştırmalı olarak incelenmesidir. Kapak rijitliğinin fonksiyonelliğe olan etkisinin yüksek öneme sahip olmasından dolayı çalışma koşullarına göre optimize edilmesi gerekir. TWIP çelikleri (Eşleştirme ile indüklenen plastisite) gelişmiş yüksek mukavemetli çeliklerin (AHHS) bir üyesidir, yüksek mukavemet ve uzama oranlarından dolayı hafifleştirme çalışmalarında çok tercih edilen çelikler arasına katılmıştır. CO2 emisyon azaltımı, enerji tasarrufu, maliyet tasarrufu gibi birçok avantajları mevcuttur. Bu makalede DD14 ve TWIP980 çeliklerinin debriyaj kapağındaki rijitlik davranışları karşılaştırmalı FEA analizleri ile incelenmiştir. Analiz sonuçlarına göre endüstriyel çelik malzeme kalınlığına göre %50 daha ince TWIP çeliği kullanıldığında kapak rijitliğinde endüstriyel çeliğe göre %76 düşüş olmaktadır. Bu durum debriyaj gibi hassas fonksiyonelliğe sahip olan komponentlerde AHHS çelikleri için ileri analiz aşamalarının gerekliliğini göstermektedir.The aim of this study is to investigate the usage of TWIP980 steel in clutches which have been demanded in automotive sector recently as an alternative to industrial steels and to compare the stiffness difference of clutch covers between industrial mild steel and TWIP980 under operating conditions. Since the cover stiffness has high effect on functioning, it needs to be well optimized according to the operating conditions. TWIP steels are a member of advanced high strength steels (AHHS) which are highly preferred steels due to high strength and elongation ratios for lightening studies. CO2 emission reduction, energy saving, cost saving are the main advantages of TWIP steels. In this article, the stiffness behavior of industrial mild steel and TWIP980 steels in the clutch cover was investigated by comparative FEA analysis. According to the analysis results, If the TWIP steel is 50% thinner than the DD14 steel material thickness, cover stiffness would be 76% lower than the industrial mild steel. This condition shows that for the clutch components which has precise functionality AHHS steels usage needs to be deeply investigated