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1. Effect of 12-Week Vitamin D Supplementation on 25[OH]D Status and Performance in Athletes with a Spinal Cord Injury.

Author

Flueck, Joelle Leonie, Schlaepfer, MaxWalter, and Perret, Claudio

Abstract

(1) Background: studies with able-bodied athletes showed that performance might possibly be influenced by vitamin D status. Vitamin D seems to have a direct impact on neuromuscular function by docking on vitamin D receptors in the muscle tissue. Additionally, a high prevalence of vitamin D deficiency was shown not only in infants and in the elderly but also in healthy adults and spinal cord injured individuals. Therefore, the aim of our study was to investigate whether a vitamin D dose of 6000 IU daily over 12 weeks would be sufficient to increase vitamin D status in indoor wheelchair athletes to a normal or optimal vitamin D level and whether vitamin D deficiency is associated with an impairment in muscle performance in these individuals; (2) Methods: vitamin D status was assessed in indoor elite wheelchair athletes in order to have a baseline measurement. If vitamin D status was below 75 nmol/L, athletes were supplemented with 6000 IU of vitamin D daily over 12 weeks. A vitamin D status over 75 nmol/L was supplemented with a placebo supplement. Vitamin D status, as well as a Wingate test and an isokinetic dynamometer test, were performed at baseline and after six and 12 weeks; (3) Results: 20 indoor elite wheelchair athletes participated in this double-blind study. All of these athletes showed an insufficient vitamin D status at baseline and were, therefore, supplemented with vitamin D. All athletes increased vitamin D status significantly over 12 weeks and reached an optimal level. Wingate performance was not significantly increased. Isokinetic dynamometer strength was significantly increased but only in the non-dominant arm in isometric and concentric elbow flexion; (4) Conclusion: a dose of 6000 IU of vitamin D daily over a duration of 12 weeks seems to be sufficient to increase vitamin D status to an optimal level in indoor wheelchair athletes. It remains unclear, whether upper body performance or muscle strength and vitamin D status are associated with each other. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Genç sağlıklı erkeklerde esneklik antrenmanının eritrosit reolojik özelliklerine ve anaerobik performansa etkileri

Author

Emine Kilic Toprak, Melek Bor Kucukatay, Gülten Erken, and Fatma Unver Kocak

Subjects
Erythrocyte Aggregation, medicine.medical_specialty, Anaerobik Performans Testi, business.industry, Anaerobic Performance Test, Eritrosit Agregasyonu, RBC Deformability, Esneklik, Physical therapy, Medicine, Eritrosit Deformabilitesi, Stretching, Flexibility, business, Anaerobic exercise, Young male, Fleksibilite
Abstract

INTRODUCTION: Stretching exercise training is used to improve flexibility and performance. This study aimed to investigate the short and long-term effects of stretching exercise on flexibility, performance, red blood cell (RBC) deformability and aggregation. METHODS: 7 young male subjects (mean age 20.71±0.52 years) participated to the study. Stretching protocol consisted of 3 repetitions for 60 seconds, 3 days/week, 6 weeks. Blood samples were obtained before and immediately after the stretching exercise on the first and after the exercise on the last day of the program. Flexibility measurement was performed, as well as countermovement, squat jump, sprint tests. Hemorheological parameters were determined using an aktacytometer. RESULTS: A significant elevation in flexibility, decrements in sprint time were observed. Following an acute insignificant elevation immediately after exercise on the first day, RBC deformability was slightly decreased on the last day after the exercise. RBC aggregation significantly decreased immediately after the stretching exercise on the first day, while post-exercise elevation was detected on the 6th week. DISCUSSION AND CONCLUSION: The results of the current study indicate that, the stretching exercise training used to develop physical capacity of the athletes, contributes blood flow and thus, athletic performance of the individual by inducing acute increments in RBC deformability and decrements in erythrocyte aggregation. GİRİŞ ve AMAÇ: Germe egzersizi, fleksibilite ve performansı geliştirmek için kullanılmaktadır. Bu çalışmada, germe egzersizinin eritrosit deformabilite ve agregasyonu, fleksibilite ve performans üzerindeki kısa ve uzun süreli etkilerinin incelenmesi amaçlanmıştır. YÖNTEM ve GEREÇLER: Çalışmaya ortalama yaşları 20,71±0,52 yıl olan 7 genç, erkek denek katılmıştır. Germe protokolü 60 saniyelik, 3 tekrarlı, haftada 3 gün olmak üzere 6 hafta uygulanmıştır. Kan örnekleri ilk egzersizden önce, hemen sonra ve 6. Haftanın sonunda egzersiz bitiminde alınmıştır. Deneklere ters yönde çömelme ve sıçrama ile esneklik ölçümleri ve sprint testleri uygulanmıştır. Hemoreolojik parametreler ektasitometre aracılığıyla ölçülmüştür. BULGULAR: Deneklerin esneklik ölçümlerinde istatistiksel olarak önemli bir yükselme, sprint zamanında ise azalma gözlenmiştir. İlk gün egzersiz sonrası eritrosit deformabilitesinde istatistiksel olarak önemli olmayan akut bir artış gözlenmiştir. 6. hafta sonunda son egzersizi takiben ise eritrosit deformabilitesinde hafif bir düşüş tespit edilmiştir. Eritrosit agregasyonu ilk egzersiz sonrası istatistiksel olarak anlamlı düzeyde azalmış, 6. haftada egzersiz sonrası ise artmıştır. TARTIŞMA ve SONUÇ: Çalışmamızın sonuçları, sporcuların fiziksel kapasitelerini geliştirmek için uygulanan germe egzersiz eğitiminin, kan akımının düzenlenmesine ve eritrosit deformabilitesinde akut artışlar, agregasyonunda ise azalmalar sağlayarak bireylerin atletik performansına katkıda bulunduğunu göstermektedir.

Published
2015

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