Physiological Responses to Fixed Lactate Concentrations in Young Soccer Players: Comparision of Playing Positions

Öz

The purpose of this study was to investigate the role of passion in predicting job and life satisfaction in fitness leaders and examine the sex and job experience differences in these variables. Two hundred (Mage=29.52+-4.38) fitness leaders participated in this study. “Passion Scale” (Vallerand et al., 2003), “Satisfaction with Life Scale” (Diener et al., 1985), and “Minnesota Job Satisfaction Questionnaire” (Weiss et al., 1967) were administered to participants. Stepwise Multiple Regression Analysis was used to determine whether fitness leaders’ levels of passion predict their job and life satisfaction. 2x2 (sex x year of job experience) Multivariate Analysis of Variance (MANOVA) was used to test the sex and year of job experience differences in passion and job satisfaction. Furthermore, 2x2 ANOVA was conducted to test sex and year of job experiences differences in life satisfaction. Results of Regression Analysis indicated that obsessive passion was a significant predictor of extrinsic job satisfaction; both harmonious and obsessive passion were a significant predictor of intrinsic job satisfaction, general job satisfaction and life satisfaction of fitness leaders (p<.01). The MANOVA results showed that participants’ passion scores differed with regard to year of job experiences (p<.05), but there were table Oxygen Analyzer (Cosmed K4b2, Italy) for each minute, and [La] was measured for every 3 minutes by taking arterialized blood from earlobe (YSI 1500, USA). RV, VO2 and HR corresponding to the fixed [La] were predicted from RV-[La], RV-HR and RV-VO2 , which were measured from VO2max and LT tests, by using polynomial curves and equations. As a result of multivariate of variance analysis, although VO2max and RV of midfielders corresponding to fixed [LA] were higher than the others, no significant differences were found on RV, percentage of VO2max and HR at the fixed [La] among the playing positions. As a result of the study, examined aerobic endurance characteristics of young soccer players showed similar physiological responses among the playing positions.

Anahtar Kelimeler

• Soccer; Maximal Oxygen Consumption; Heart rate; Fixed lactate threshold

Genç Futbolcularda Sabit Laktat Konsantrasyonlarına Verilen Fizyolojik Cevaplar: Mevkiler Arası Karşılaştırma

Öz

Bu çalışmanın amacı, genç futbolcularda sabit laktat konsantrasyonlarına ([La]; 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 ve 5.0 mM.L-1) karşılık gelen koşu hızı (KH), kalp atım hızı (KAH) ve maksimum oksijen tüketiminin (VO2maks) kullanılan yüzdesi (%VO2maks)’ni mevkilere göre karşılaştırılmasıdır. Bu amaçla; 49 futbolcu (17 defans, 20 orta saha ve 12 forvet) çalışmaya gönüllü olarak katılmıştır. (Yaş:17.1+-0.7 yıl, Kilo: 68.6+-7.3 kg, Boy: 175.6+-5.8 cm). VO2maks ve laktat eşikleri testi (LT), futbol sahasında Modifiye Mekik Koşusu testi protokolüne uygun olarak denekler tükenene kadar yaptırılmıştır. Testler sırasında portatif O2 analizörü (Cosmed K4b2, Italy) ile VO2 ve KAH, her üç dakikada ise bir kulak memesinden alınan arteriyal kandan [La] ölçülmüştür (YSI 1500, USA). Sabit [La] karşılık gelen KH, VO2 ve KAH; VO- 2maks ve LT testinden elde edilen KH-[La], KH-KAH ve KH-VO2 grafiklerinden polinom eğriler ve denklemler yardımıyla belirlenmiştir. Yapılan MANOVA sonuçlarına göre, VO2maks ve sabit [La] karşılık gelen KH orta saha oyuncularında diğer mevkilere göre daha yüksek değerlere sahipken, bu fark istatistiksel olarak anlamlı değildir (p>0.05). Sonuç olarak; incelenen aerobik dayanıklılık özellikleri, genç futbolcularda mevkiler arasında elde edilen fizyolojik cevapların benzer olduğu ortaya çıkmıştır.

Anahtar Kelimeler

• Futbol; Maksimum Oksijen Tüketimi; Kalp atım hızı; Sabit laktat eşikleri

Kaynakça

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