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ÖZGÜL, BAHAR

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2012 - 201922020 - 20231
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Author: POLAT, MİNE GÜLDEN × Has files: true ×

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    PublicationOpen Access
    An Investigation of the Effects of Holographic Wristbands on Strength, Balance and Flexibility - a Double-Blind Placebo Controlled Study
    (SOC PHYSICAL THERAPY SCIENCE, 2012) ÖZGÜL, BAHAR; Sari, Zubeyir; Kablan, Nilufer; Ozgul, Bahar; Aydogdu, Onur; Timurtas, Eren; Tutuncuoglu, Fatih; Yurdalan, Saadet Ufuk; Polat, Mine Gulden
    [Purpose] This study investigated the effects of holographic wristbands on strength, balance and flexibility. [Subjects and Methods] The study included 43 healthy university students, 15 females (34.88%) and 28 males (65.12%), attending the Department of Physiotherapy and Rehabilitation at Marmara University. The age of the participants ranged from 19 to 27 (mean age 21.2 +/- 1.7 years). Strength, balance with eyes open, balance with eyes closed and flexibility were evaluated under four different conditions of wearing holographic EFX (R), PWX (R) and placebo wristbands, and no wristband. [Results] In evaluations of strength, balance with eyes are open, balance with eyes closed and flexibility, a significant difference was observed in favor of the placebo wristband compared to the PWX (R) wristband. For the other tests, holographic wristbands had no effect on strength, flexibility or balance with eyes closed. [Conclusion] It was concluded that holographic wristbands, which are marketed asergogenic aids, have no effect on strength, balance or flexibility.
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    PublicationOpen Access
    The association between isokinetic strength and strength asymmetry and jump performance in female volleyball players
    (2023-01-01) AYBERK, BAHAR; ÖZGÜL, BAHAR; POLAT, MİNE GÜLDEN; ATİK B., AYBERK B., ÖZGÜL B., POLAT M. G.
    Purpose: Since the use of normalized isokinetic strength was recently proposed to analyze sportive performance, it was aimed to examine relative isokinetic muscle strength as well as absolute strength in jump performance. Secondly, the investigation of the relationship between extremity-based and inter-extremity strength asymmetry and selected jump tasks was aimed. Methods: Thirty female professional volleyball players (23.70 ± 5.27 years) who has at least four training sessions per week participated to study during the pre-season period Peak torque (PT) of knee flexors and extensors at the speed of 60º/s and 180º/s were evaluated using isokinetic dynamometer. Jump height (cm) and relative power (W/kg) of vertical countermovement jump (CMJ) and squat jump (SJ) were tested by optojump photoelectric system. Results: A positive moderate correlation between PT and relative PT(rPT) at both speeds with jump height was detected (r = 0.365–0.594). It was found that jump power had a positive moderate to good correlation with PT(r = 0.557–0.731) and low to moderate correlation with rPT (r = 0.314–0.601). No significant correlation was found between hamstring/quadriceps ratio and bilateral muscle asymmetry with jump parameters (p > 0.05). Conclusions: Due to the relatively low level of relationship between normalized strength and performance, we suggest carrying out further studies examining the effects of normalized parameters on performance. Considering the findings based on strength asymmetry, the coordinated action of the relevant muscles may come to the forefront during the performance, rather than muscle strength.
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    PublicationOpen Access
    Gender and age impact on plantar pressure distribution in early adolescence
    (TURKISH ASSOC ORTHOPAEDICS TRAUMATOLOGY, 2019-05) ÖZGÜL, BAHAR; Demirbuken, Ilksan; Ozgul, Bahar; Timurtas, Eren; Yurdalan, Saadet Ufuk; Cekin, Murat Dincer; Polat, Mine Gulden
    Objective: The aim of the study was to investigate gender and age effect on dynamic plantar pressure distribution in early adolescence. Methods: A total of 524 adolescents (211 women and 313 men; mean age: 12.58 +/- 1.11 years (range: 11-14 years)) participated in pedobarographic measurements during gait at self-selected speed. Data of peak pressure (PP), maximum force (MaxF-Newton), body weight corrected maximum force (BW_MaxF), contact area (CA-cm(2)) were analyzed for total foot and four plantar regions (hindfoot, midfoot, forefoot and toes). Results: Higher toes PP was found in the ages of 12-14 years in females compared to males (253.79 +/- 104.93 vs 216.00 +/- 81.12 for the age of 12, p = 0.011, 264.40 +/- 65.02 vs 227.21 +/- 83.4 for the age of 13, p = 0.044, 299.75 +/- 140.60 vs 238.75 +/- 103.32 for the age of 14, p = 0.005). Females' higher MaxF especially for toes (136.24 +/- 48.54 vs 115.33 +/- 46.03, p = 0.008) and smaller CA especially for forefoot (50.12 +/- 5.79 vs 54.4893 +/- 6.80, p = 0.001) were considerable in the late of early adolescence. Forefoot (305.66 +/- 82.14 females p = 0.001, 281.35 +/- 79.59 males p < 0.001) and total foot PP (374.08 +/- 113.93 females, p = 0.035, 338.61 +/- 85.85 males p = 0.009) at the age of 14 was significantly higher than in younger ages in both gender groups. Conclusion: The results indicate that especially the age of 14 years in early adolescence is a critical age for alteration in plantar pressure distribution. Interestingly females tended to increase their toe and forefoot plantar pressures compared to males by increasing age. We suggest that gender and age impact on toes plantar pressure alterations in early adolescence may be a possible risk factor for further foot impairments. (C) 2019 Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V.