Sürdürülebilir Kalkınma Amaçları
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- MakaleAçık Erişim2024Exploring the associations between ankle dorsal and plantar flexion strength, reactive strength index, and balance in elite youth soccer players
Kayhan, Recep Fatih; Terzi, Esranur; Bayrakdaroğlu, Serdar; Ceylan, Halil İbrahim; Morgans, Ryland; Nikolaidis, Pantelis T.
Background: Enhanced muscular strength has been widely acknowledged as a fundamental determinant of improved performance in the lower extremities. However, the specific impact of ankle strength on explosive strength and balance remains inadequately elucidated. Consequently, this study aims to (a) evaluate balance, reactive power, and flexor–extensor muscle balances in soccer players, and (b) evaluate ankle dorsal and plantar flexion muscle strength as predictive factors for reactive strength index and balance performance. Methodology: A cohort comprising 38 actively engaged Turkish National League soccer players participated in the study. The assessment encompassed explosive power through a drop jump, dynamic balance utilizing a moving disc, and ankle strength measured with a handheld dynamometer. Results: The findings revealed that dominant lower limb dorsal flexion strength emerged as a significant predictor of both reactive strength (R2 = 0.106, p < 0.05) and balance (R2 = 0.121, p < 0.05). Similarly, non-dominant lower limb dorsal flexion strength was identified as a significant predictor of reactive strength (R2 = 0.362, p < 0.05). Furthermore, the study established that dominant lower limb plantar flexion strength significantly predicted balance (R2 = 0.121, p < 0.05), while non-dominant lower limb plantar flexion strength served as a significant predictor of both reactive strength (R2 = 0.148, p < 0.05) and balance (R2 = 0.179, p < 0.05). Conclusions: Consequently, these findings emphasize the significance of incorporating targeted exercises designed to enhance intrinsic foot musculature, thereby augmenting both explosive strength and balance in athletes. While acknowledging the persistent importance of strength assessment in evaluating lower extremity performance, our results underscore the critical role played by ankle muscle strength in the execution of explosive strength and balance.
- MakaleYalnız künye2021The solutions of multiplicative Hermite differential equation and multiplicative Hermite polynomials
Yalçın, Numan
In this work, we give the power series solutions around an ordinary point, in the case of variable coefficients, homogeneous multiplicative differential equations of 2nd order. Further, we introduce the multiplicative Hermite differential equations, multiplicative Hermite polynomials and basic properties of these polynomials.
- MakaleYalnız künye2010Apical lymph nodes at the root of the inferior mesenteric artery in distal colorectal cancer: An analysis of the risk of tumor involvement and the impact of high ligation on anastomotic integrity
Alici, A.; Kement, M.; Gezen, C.; Akın, T.; Vural, S.; Okkabaz, N.; Basturk, E.; Yegenoglu, A.; Oncel, M.
Background: What level of arterial ligation is best in left-sided colon cancer and rectal cancer remains controversial. This study aims to assess the necessity and risk of high ligation from an oncological and technical perspective. Methods: The lymph nodes at the origin of the inferior mesenteric artery (IMA) were separated as apical nodes in all patients operated for distal colorectal cancer in our department. The number and status of the nodes were prospectively assessed, and demographic and tumor-related variables were evaluated as risk factors for apical tumor invasion. Anastomotic leaks were also evaluated. Results: A hundred and three patients (52 [50.5%] males, 60.3 ± 12.9 years old) were included. The number of non-apical lymph nodes harvested was 14.5 ± 7.1 with an additional 4.4 ± 3.2 apical nodes at the high ligation site. Tumor invasion of apical nodes was observed in 6 (5.8%) patients. Two of these (1.9%) had no other positive nodes (skip metastases). Although none of the variables evaluated was found significant for predicting apical node positivity, tumor invasion was detected in 8.5 and 22.2% of patients with pT3 and pN2 cancers, respectively. Among patients, who had an anastomosis (n = 84, 81.6%), anastomotic leak was observed in 7(8.3%) and 1 (1.2%) of these patients required emergency relaparotomy. There was no mortality related to high ligation. Conclusions: High ligation of IMA may be routinely performed in patients with distal colorectal cancer, since tumor invasion of apical lymph nodes is neither rare (>5%) nor predictable, and skip metastases may also occur. This is especially true in case of an advanced disease for which apical node positivity peaks. The anastomotic leak rate is less than 10%, and mortality is low after high ligation of IMA.
- DergiTechniques in Coloproctology
- DergiSport Sciences for Health
- DergiRendiconti del Circolo Matematico di Palermo