Yazar "Schoenfeld, Brad" seçeneğine göre listele
Listeleniyor 1 - 5 / 5
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Effect of exercise on appetite-regulating hormones in overweight women(Inst Sport, 2013) Tiryaki-Sönmez, Gül; Özen, Şerife; Buğdaycı, Güler; Karlı, Ümid; Özen, Güçlü; Çoğalgil, Şirzat; Schoenfeld, Brad; Sözbir, Kerim; Aydın, KutluOver the past decade, our knowledge of how homeostatic systems regulate food intake and body weight has increased with the discovery of circulating peptides such as leptin, acyl ghrelin, des-acyl ghrelin and obestatin. These hormones regulate the appetite and food intake by sending signals to the brain regarding the body's nutritional status. The purpose of this study was to investigate the response of appetite-regulating hormones to exercise. Nine overweight women undertook two 2 h trials in a randomized crossover design. In the exercise trial, subjects ran for 60 min at 50010 of maximal oxygen uptake followed by a 60 min rest period. In the control trial, subjects rested for 2 h. Obestatin, acyl ghrelin, des-acyl ghrelin and leptin concentrations were measured at baseline and at 20, 40, 60, 90 and 120 min after baseline. A two-way ANOVA revealed a significant (P<0.05) interaction effect for leptin and acyl ghrelin. However, changes in obestatin and des-acyl ghrelin concentration were statistically insignificant (P>0.05). The data indicated that although acute treadmill exercise resulted in a significant change in acyl ghrelin and leptin levels, it had no effect on plasma obestatin and des-acyl ghrelin levels.Öğe Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise(Lippincott Williams & Wilkins, 2013) Schoenfeld, Brad; Sönmez, R. Gül Tiryaki; Kolber, Morey J.; Contreras, Bret; Harris, Robert; Özen, ŞerifeSchoenfeld, B, Sonmez, RGT, Kolber, MJ, Contreras, B, Harris, R, and Ozen, S. Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise. J Strength Cond Res 27(10): 2644-2649, 2013The reverse fly machine is a popular exercise for strengthening the horizontal shoulder abductors including the posterior deltoid. There seems to be little consensus as to which hand position most effectively targets the posterior deltoid despite this option on most machines. This study investigated the impact of varying one's hand position, and consequently altering shoulder joint rotation, on muscle activity in various glenohumeral muscles during exercise on the reverse fly machine. Nineteen resistance-trained men (mean age = 23.2 +/- 4.3 years; height = 176.9 +/- 7.1 centimeters; body mass = 81.3 +/- 10.5 kilograms; body mass index = 25.9 +/- 2.6) were recruited from a university population to participate in the study. In a repeated measures design, subjects grasped the hand bars on the machine with either a pronated (PRO) or neutral (NEU) grip and performed dynamic horizontal abduction repetitions to muscular failure using a load equating to approximately 75% body weight. The order of performance of the hand positions was counterbalanced between participants so that approximately half of the subjects performed PRO first and the other half performed NEU first. Surface electromyography was used to record both mean and peak muscle activity of the posterior deltoid, middle deltoid, and infraspinatus. Results showed that mean electromyography activity for the posterior deltoid was significantly greater in NEU compared with PRO (p = 0.046; 95% CI = 0.1-7.4% maximal voluntary isometric contraction). Similarly, mean electromyography activity of the infraspinatus also was significantly greater in NEU compared with PRO (p = 0.002; 95% CI = 3.7-13.6% maximal voluntary isometric contraction). The results of this study show that performing exercise on the reverse fly machine with a neutral hand position significantly increases activity of the posterior deltoid and infraspinatus muscles compared with a PRO hand position.Öğe Effects of oral supplementation of mint extract on muscle pain and blood lactate(Walter De Gruyter Gmbh, 2010) Sönmez, Gül Tiryaki; Çolak, Mergül; Sönmez, Sedat; Schoenfeld, BradStudy aim: To determine the effects of mint extract on muscle pain and blood lactate levels after a 400-m run. Material and methods: A group of 16 physical education students (mean age 21.81 +/- 2.13 years) volunteered to participate in the study. The subjects were randomly assigned into 3 groups: mint, placebo or control. The mint group was given orally mint extract (5 ml/kg of body mass) and the placebo group was given unsweetened tea (5 ml/kg) in a double-blind fashion and cross-over design one hour before a 400-m running test. Subjects in the control group remained untreated. The effect of mint extract on muscle pain was recorded by an inquiry; blood lactate levels were measured after the running test. Results: Oral administration of mint extract significantly (p<0.01) decreased blood lactate concentrations but muscle pain levels remained unchanged in all groups. Conclusions: Oral administration of mint extract may have a beneficial effect on blood lactate clearance and therefore may increase athletic performance.Öğe Obesity, food intake and exercise: relationship with Ghrelin(Walter De Gruyter Gmbh, 2015) Sönmez, Gül Tiryaki; Vatansever, Şerife; Ölçücü, Burçin; Schoenfeld, BradObesity, a disorder of body composition, is defined by a relative or absolute excess of body fat. In general adult population, obesity has been associated with a diverse array of adverse health outcomes, including major causes of death such as cancer, diabetes, cardiovascular disease, as well as functional impairment from problems such as osteoarthritis and sleep apnea. Ghrelin is a newly discovered peptide hormone which plays an important role in obesity. It is a powerful, endogenous orexigenic peptide and has a crucial function in appetite regulation, as well as short -and long-term energy homeostasis. In the presence of increased obesity, decreased physical activity, and high food consumption, the relationship between exercise, appetite, food intake and ghrelin levels has important implications. In this review, we discuss the effect of acute and chronic exercise performance on appetite, food intake and ghrelin and their relationships.Öğe Omega-3 fatty acids and exercise: A review of their combined effects on body composition and physical performance(Walter De Gruyter Gmbh, 2011) Tiryaki, Gül Sönmez; Schoenfeld, Brad; Vatansever, Şerife ÖzenOmega-3 (n-3) fatty acids, and the long-chain n-3 derivatives eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in particular, have been extensively researched for their nutritive effects. Among their many purported benefits, n-3 acids have been implicated as positive mediators of cardiovascular health and body composition. It has therefore been speculated that supplementation may enhance the beneficial effects of physical activity, potentiating greater reductions in body fat and improvements in exercise performance. This paper has three objectives: first, to assess the theoretical basis for a synergistic ef-fect when n-3 supplementation is combined with exercise; second, to review the literature as to specific findings on the subject and third, to make relevant conclusions and recommendations for future research.
