Turkiye Klinikleri Journal of Sports Sciences

.: ORIGINAL RESEARCH
Diurnal Variations in Well-Trained Semi-Professional Soccer Players' Performance in the Running-Based Anaerobic Sprint Test
İyi Antrenmanlı Yarı-profesyonel Futbolcuların Koşuya Dayalı Anaerobik Sprint Test Performansında Diurnal Varyasyonlar
Zeliha Nur KALYONa, Cem KURTb
aDepartment of Physical Education and Sport, Trakya University Faculty of Kırkpınar Sport Sciences, Edirne, TURKEY
bDepartment of Coaching Education, Trakya University Faculty of Kırkpınar Sport Sciences, Edirne, TURKEY
Turkiye Klinikleri J Sports Sci. 2021;13(1):16-22
doi: 10.5336/sportsci.2020-77323
Article Language: EN
Full Text
ABSTRACT
 Objective: This study examined whether there were diurnal variations in the running-based anaerobic sprint test (RAST) performance of semi-professional, male soccer players. Material and Methods: Participants included 25 people whose ages ranged from 18- 36 years old, (mean=20 years); weight ranged from 52-110 kg (mean=72 kg); mean height was 176.92±6.17 cm; experience playing soccer ranged from 5-22 years (mean=8 years); and average weekly training duration was 3-22 h (mean=6 h). Chronotypes were estimated using the Turkish version of the Horn-Östberg Morningness-Eveningness Personality Questionnaire. They performed RAST in a randomized study design using the Newtest Powertimer 300-series photocells twice, on two separate days, one week apart, either in the morning (8.30-10.00 AM) or afternoon (5.00-6.00 PM). Before each of test session; the air temperature and humidity; along with their oral body temperature and 24 h food intake data were recorded. Resultsː Paired t-tests were used to analyze differences due to the time of day in the RAST variables. Maximum power (p>0.05), minimum power (p>0.05), mean power (p>0.05), fatigue index (p>0.05), air temperature (p>0.05), body temperature, and caloric intake (p>0.05) did not differ in the morning and afternoon. Conclusion: In contrast to previous research, RAST performance showed no diurnal variations. A possible explanation could be attributed to the participants' chronotypes conforming to neither the morning nor evening types. However, replicating this study with soccer players having an extreme morning or extreme evening chronotypes may lead to different results.

Keywords: Chronotype; diurnal rhythms; running-based anaerobic sprint test; soccer; morningness-eveningness
ÖZET
 Amaç: Bu çalışmanın amacı, iyi antrenmanlı yarı-profesyonel futbolcuların koşuya dayalı anaerobik sprint test (KAST) performanslarında diurnal varyasyonların olup olmadığını değerlendirmektir. Gereç ve Yöntemler: Çalışmaya katılan 25 futbolcunun yaş aralıkları 18-36 yıl iken, ortalama yaşları 20 yıldır. Ortalama ağırlıkları 72 (52- 110) kg; ortalama boyları 176.92±6.17 cm; ortalama futbol tecrübeleri 8 (5-22) yıl ve ortalama haftalık antrenman süreleri de 6 (3-22) saattir. Futbolcuların kronotipleri, Horn-Östberg'in sabahçıl ve akşamcıl tipleri belirleme anket formu kullanılarak, ne akşamcıl ne de sabahçıl (ara tip) olarak belirlendi. Futbolcular, 1 hafta arayla 2 farklı günde olmak üzere 2 kez [ya sabah (8.30-10.00) ya da öğleden sonra (17.00-18.00)] Newtest Powertimer 300 serisi fotosel kullanılarak randomize çalışma dizaynında KAST için test edildi. Her test seansı öncesi hava sıcaklığı ve nem oranı ile oral vücut sıcaklığı, 24 saatlik besin kayıtları kaydedildi. Bulgular: Futbolcuların KAST değişkenlerinde diurnal varyasyonları analiz etmek için eşleştirilmiş örneklemler için t-testi kullanıldı. Maksimum güç (p>0,05), minimum güç (p>0,05), ortalama güç (p>0,05), yorgunluk indeksi (p>0,05), hava sıcaklığı (p>0,05), vücut ısısı ve kalori alımları (p>0,05) sabah ve akşam farklı değildi. Sonuç: Önceki araştırmaların aksine, futbolcuların KAST performanslarında diurnal varyasyon belirlenmedi. Bu durumun olası sebebi, katılımcıların kronotiplerinin ne sabahçıl ne de akşamcıl (ara tip) olmasına bağlandı. Bununla birlikte, bu çalışmanın sabahçıl veya akşamcıl kronotipli futbolcularla tekrarlanması farklı sonuçların elde edilmesini sebep olabilir.

Anahtar Kelimeler: Kronotip; diurnal ritimler; koşu temelli anaerobik sprint testi; futbol; sabahçıl-akşamcıl
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