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Laktik Asitin Ölçümünde Kullanılan Bir El Analizörünün Değerlendirilmesi: Lactate Scout(+)’in Güvenirliği ve Geçerliği

Evaluation of a Handheld Lactic Acid Analyser: Reliability And Validity of the Lactate Scout (+)

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Abstract (2. Language): 
The aim of this study was to evaluate the validity and reliability of the Lactate Scout Plus (LSP) hand-held portable lactate analyzer. YSI Sports 1500 analyzer was used for validity as a reference method. Blood samples were collected during an incremental field test. In order to evaluate reliability, 34 blood samples (n= 34) whose lactate consentration values changed (LA) between 0.80- 12.80 mM.L-1 were measured two times by LSP. In order to evaluate validity 84 blood samples (n= 84), whose LA concentrations values changes between 0.60-11.67 mM.L-1 were measured at the same time by YSI 1500 and LSP. Validity was also assessed measuring three samples nominally called low (<2,5 mM.L-1), medium (2,5-5.0 mM.L-1), and high (5.0+ mM.L-1). There was no statistically significant difference between repeated measurments of LSP (p>0.05). Intra-class correlation coefficient of LSP was r=0.998. Typical error for repeated measures and coefficient of variation was 0.19 mM.L-1 and ~% 5, respectively. All LA values which were measured by LSP was statistically different from the reference method except for the moderate LA concentrations (p<0.05). LSP analyzer has high validity coefficient (r=0.994) for the lactate concentration values in the range of 0.60- 11.67 mM.L-1 (n=84). Validity coefficients were calculated as r=0.907 for low, r=0.925 for medium, and r=0.977 for high LA concentrations. Standart error of estimate (SEE) for regression model of LSP for LA sampling (n=84) was 0.35 mM.L-1. SEE was calculated as 0.19 mM.L-1 for low, 0.30 mM.L-1 for medium, and 0.51 mM.L-1 for high LA concentrations. Bland-Altman plots showed that in the range of 0.60 – 11.67 mM.L-1 in 95% of blood samples, obtained with LSP analyzer, ranged from less than 0.49 mM.L-1 to greater than 0.87 mM.L-1 of the values obtained with the YSI analyzer. Mean of the absolute difference between two analyzer was 0.19 mM.L-1. Mean of the absolute difference for low, medium and high concentrations were 0.20, 0.12 and 0.24 mM.L-1 respectively. Results of this study show that although LSP analyzer has high validty and reliability, it measures significantly different from reference method both at low and high LA concentrations.
Abstract (Original Language): 
Bu çalışmanın amacı bir el analizörü olan Lactate Scout Plus (LSP)’nin güvenirliğini ve geçerliğini değerlendirmektir. Geçerlik için YSI Sports 1500 analizörü referans yöntem olarak kullanılmıştır. Kan örnekleri şiddeti giderek artan saha testinde toplanmıştır. Güvenirlik için laktat konsantrasyonu(LA) 0.80 – 12.80 mM.L-1 aralığında değişen n=34 kan örneği LSP analizöründe iki kez ölçülmüştür. Geçerlik için LA 0.60 – 11.67 mM.L-1 aralığında değişen n = 84 kan örneği aynı anda hem LSP hem de YSI analizöründe ölçülmüştür. Geçerlik kan örneklerinin tümü (0.60 – 11.67 mM.L-1), ve sayısal olarak düşük (< 2.5 mM.L-1) (n=37), orta (2.5 – 5.0 mM.L-1) (n=20) ve yüksek (>5.0 mM.L-1) (n=27) konsantrasyonlar için ayrı ayrı değerlendirilmiştir. LSP’nin tekrarlı ölçümlerinde anlamlı fark saptanmamıştır (p>0.05). LSP’nin sınıf içi güvenirlik katsayısı r = 0.998’dir. Tekrarlı ölçümler için tipik hata 0.19 mM.L-1, varyasyon katsayısı ~% 5’dir. Orta konsantrasyon aralığındaki hariç LSP’den ölçülen LA değerleri, referans yöntemden ölçülenden önemli derecede farklıdır (p<0.05). 0.60–11.67 mM.L-1 aralığında değişen (n = 84) LA için LSP analizörü yüksek geçerlik katsayısına (r = 0.994) sahiptir. Düşük, orta ve yüksek konsantrasyonlar için geçerlik katsayıları sırasıyla r = 0.907, r = 0.925, r = 0.977 hesaplanmıştır. YSI’dan ölçülen LA değerlerinden (n=84) LSP değerlerini kestiren regresyon modelinin kestirimin standart hatası (KSH) =0.35 mM.L-1, düşük konsantrasyon için KSH=0.19 mM.L- 1, orta konsantrasyon için 0.30 mM.L-1, yüksek konsantrasyon için 0.51 mM.L-1’dir. Bland Altman grafiklerinde 0.60 – 11.67 mM.L-1 aralığında LSP analizörü kan örneklerinin % 95’ini YSI’dan 0.87 mM.L-1 yüksek, 0.49 mM.L-1 düşük ölçmüştür. İki analizör arasındaki mutlak fark ortalaması 0.19 mM.L-1’dir. Düşük, orta ve yüksek konsantrasyonlar için iki analizör arasındaki mutlak farkların ortalamaları sırasıyla 0.20, 0.12 ve 0.24 mM.L-1’dir. Bu çalışmanın sonuçları LSP analizörünün yüksek güvenirlik ve geçerliğe sahip olduğunu göstermekle beraber, düşük ve yüksek konsantrasyonlarda referans yöntemden anlamlı derecede farklı ölçmektedir.
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