Zakir Osmanov

Dr. Zakir Osmanov

Gazi University, Ankara, Turkey (Türkiye)
orcid

Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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13 October 2022 in Biology
Verified
Journal Article
Open access
PDF file
RKRaci Karayigit
Raci Karayigit
Scott ForbesScott Forbes
Scott Forbes
ZOZakir Osmanov
Zakir Osmanov
CYCanan Yilmaz
Canan Yilmaz
BYBurak caglar yasli
Burak caglar yasli
OEOzcan Esen
Ozcan Esen
The aim of this study was to determine the effect of low and moderate doses of caffeine ingestion via caffeinated coffee on repeated sprint test (RST) and plasma catecholamine concentration in trained female team-sport athletes. In a randomized, double-blind, crossover design, 13 female team-sport athletes (VO2max: 48.7 ± 4 mL·kg·min−1) completed three RST trials, separated by 4-day, 60 min post-ingestion of either 3 mg·kg−1 (LCOF) or 6 mg·kg−1 (MCOF) or placebo (PLA). The RST consisted of 12 × 4 s sprints on a cycle ergometer interspersed with 20 s of active recovery. Blood lactate (BLa) and glucose (GLU) and epinephrine and norepinephrine concentrations were collected before and 60 min after coffee ingestion, and after RST. Heart rate (HR) and ratings of perceived exertion (RPE) were measured at the beginning of RST, and after the 6th and 12th sprints. Average peak power score during RST was significantly improved after LCOF (p = 0.016) and MCOF (p = 0.041) compared to PLA, but peak and mean power output of the individual sprints, and fatigue index were not different between trials (all p > 0.05). Epinephrine and norepinephrine concentrations were significantly higher before and after RST in LCOF and MCOF compared to PLA (all p < 0.05). BLa was also higher after RST in both LCOF and MCOF compared to PLA (p = 0.005). HR, RPE, and GLU were not different between conditions (p > 0.05). In conclusion, low and moderate dose of caffeine ingestion can enhance the average peak power score during repeated sprints. These findings partly support low and moderate doses of caffeine supplementation via coffee as a nutritional ergogenic aid for trained female team-sport players during repeated sprint exercise.

2 July 2021 in International Urology and Nephrology
Verified
Journal Article
Closed access
PDF file
EYEmre Yasar
Emre Yasar
HOHasan Selcuk Ozger
Hasan Selcuk Ozger
HYHacı Hasan Yeter
Hacı Hasan Yeter
CYCigdem Yildirim
Cigdem Yildirim
ZOZakir Osmanov
Zakir Osmanov
UDUlver Derici
Ulver Derici