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    Determination of the Heart Rate Deflection Point by The Dmax Method
    (Edizioni Minerva Medica, 1996) Kara, Mehmet; Gökbel, Hakkı; Bediz, Cem; Ergene, Neyhan; Üçok, Kağan; Uysal, Hüseyin
    Objective, Conconi et al, proposed that the point where heart rate departed from linearity in an incremental exercise test was a good indicator of the anaerobic: threshold, However, the heart rate deflection points (HRDPs) can not be determined in many subjects, The aim of this study was to determine the heart rate deflection point by the Dmax method and to compare it with the conventional linear method, Setting. The study was performed in the Exercise Physiology Laboratory in the Faculty of Medicine, Selcuk University, Participants, Thirthy-two untrained males (aged 18-22) performed a maximal exercise test on a cycle ergometer, Results. The deflection from linearity of HR could not be detected in nine subjects (28%) by the linear method, The HRDPs could be detected in all subjects by the Dmax method, It was observed that the HR values in the HRDPs determined by both methods were close to the maximal HR values (approximately 90% of maximum), There were high correlations and no differences (p more than 0.05) between the deflection points expressed as oxygen uptake, HR and work rate determined by two methods (correlation coefficients 0.93, 0.93, 0.97, respectively, p less than 0.001), Conclusions. The Dmax method is more useful than linear method, The HRDPs of all the people can easily and objectively be found by this method.
  • Küçük Resim Yok
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    Kronik obstrüktif akciğer hastalığında teofilinin akım oran indeksi ve solunum fonksiyon testleri üzerine etkisi
    (1997) Demiralay, Rezan; Zamani, Adil; Bediz, Cem; Süerdem, Mecit
    Bu çalışma, kronik obstrüktif akciğer hastalığında (KOAH) tek doz intravenöz teofilinin bronkodilatör etkisini araştırmak için planlandı. Teofilinin bronkodilatör etkisini belirlemede standart solunum fonksiyon testlerinin yamsıra, akım-oran indeksi (FR 75) de incelendi. Çalışma, akut atak döneminde bulunan 42 KOAH'lı hasta üzerinde çift kör, plasebo kontrollü metodla gerçekleştirildi. 21 hastaya (yaş ortalaması 60.1 2.34) 6 mg/kg dozunda intravenöz teofılin uygulanırken, kontrol grubunu oluşturan 21 hastaya (yaş ortalaması 59.5 3.25) ise sadece serum fizyolojik enjekte edildi. İntravenöz enjeksiyonlardan önce ve 10 dakika sonrasında solunum fonksiyon testleri yaptırıldı ve akım-oran indeksleri hesaplandı. Teofılin uygulanan hastalarda FVC ve FR 75 haricindeki diğer tüm parametrelere ait bazale göre değişim oranları plaseboya göre önemli derecede yüksek bulundu. Böylece KOAFTın akut atak tedavisinde tek doz teofılin enjeksiyonunun uygulanabileceği sonucuna varıldı.
  • Küçük Resim Yok
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    Reliability of Peak-Lactate, Heart Rate, and Plasma Volume Following the Wingate Test
    (LIPPINCOTT WILLIAMS & WILKINS, 1998) Weinstein, Yitzhak; Bediz, Cem; Dotan, Raffy; Falk, Bareket
    Purpose: The 30-s Wingate Anaerobic Test (WAnT) has been used to assess anaerobic performance capacity and to evaluate physiological responses to supramaximal exercise. Blood lactate concentration ([La]) following supramaximal exercise is often used in the field and in the laboratory to assess the glycolytic contribution to exercise. Although the reliability of the performance in the WAnT has been established, this has not been the case with the WAnT's [La] response. Thus, the main purpose of this research was to study the test-retest reliability of peak [La] following the WAnT. Additionally, the test-retest reliability of the heart rate (HR) and plasma volume changes (Delta PV) response was also evaluated. Methods: Twenty-nine subjects (15 male, 14 female) of diverse training levels as well as physical characteristics (mean +/- SD: 23.3 +/- 7.0 yr, 62.5 +/- 12.0 kg, 170.8 +/- 9.7 cm, and 16.3 +/- 6.2% fat) performed two WAnTs within 1 wk. Capillary blood was sampled from a prewarmed fingertip at rest just before the WAnT and at 3, 5, 7, and 9 min following it. HR was also measured during these times. Results: Mean-power (MP) (+/-SE) in test 1 and test 2 was 8.4 +/- 0.2 and 8.3 +/- 0.2 W.kg(-1) body mass, respectively. Peak [La] was attained 5-7 min following the WAnTs and was nor significantly different between test 1 and test 2 (9.7 +/- 0.3 vs 9.8 +/- 0.3 mM, respectively). Peak HR occurred within 5 s post-WAnT and was not different between tests (170.8 +/- 2.2 and 171.3 +/- 2.2 beats.min(-1) in test 1 and test 2, respectively). Peak Delta PV was not different between tests (-12.0 +/- 3.4 and -11.1 +/- 3.2%, in rest 1 and test 2, respectively). The intraclass reliability coefficients for peak [La]. peak HR and Delta PV were 0.926, 0.941, and 0.878, respectively, whereas the corresponding value for MP was 0.982. Conclusions: We conclude that peak [La], peak HR, and Delta PV following me WAnT are reliable measures.