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With the advent of the ski-skating technique, upper body power has increasingly been shown to be a major factor in cross-country skiing success. The purpose of this study was to evaluate 4 commonly used training methods (weight, circuit, rollerboard, and ski-specific training) for the development of upper body power (UBP) in junior cross-country skiers. Fifty-eight adolescent cross-country skiers (Boys: n = 29, age = 16.0 +/- 1.2 y and Girls: n = 29, age = 15.5 +/- 1.5 y) were assigned to one of the UBP training methods for a 10-week training program. Fourteen cross-country runners served as controls (boys: n = 7, age = 15.8 +/- 1.7 y; girls: n = 7, age = 14.9 +/- 1.3 y). Skiers were evaluated pre- and post-training for upper body strength (UBS) using a 10 repetition maximum (RM) rollerboard test, for UBP using a double-poling ergometer and for upper body endurance (UBE) with a 3-km, arms-only, rollerski endurance time trial. Competitive race results were collected during the winters before and after training as were all training data. Only the rollerboard training group improved significantly greater than the control group (p < 0.05) in UBP and UBS. Improvements in UBP, UPS, and UBE were significantly related (r = 0.545, 0.303, and 0.407, respectively) to improvements in competitive performance. These data suggest that training using a rollerboard with 5-12RM and explosive speed is more effective in developing UBP than other common training methods for adolescent cross-country skiers. The practical importance of these data was verified by the significant relationships between improvements in UBP, UBS, and UBE related to improvements in competitive race performance.
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http://dx.doi.org/10.1519/1533-4287(2004)018<0063:doubpi>2.0.co;2 | DOI Listing |
Toxicol Rep
December 2024
Laboratory of Forensic Chemistry and Toxicology, School of Forensic Sciences, National Forensic Sciences University, Delhi, India.
Antibiotics are indispensable in modern healthcare, playing a critical role in mitigating bacterial infections. Azithromycin is used to fight upper respiratory tract infections, however has potential toxic effects that remain inadequately understood. In our present study, azithromycin exposure to led to significant physiological and behavioral change, with pronounced effects observed at the studied concentration.
View Article and Find Full Text PDFFront Physiol
December 2024
Unitat de Suport a la Recerca Terres de l'Ebre, Fundació Institut Universitari d'Investigació en Atenció Primària Jordi Gol i Gurina (IDIAP JGol), Tortosa, Spain.
Introduction: Fibromyalgia (FM) and chronic fatigue syndrome (CFS) are complex central sensitization syndromes that represent an important public health problem. Low cardiorespiratory fitness and muscle function with habitual intolerance to efforts are common characteristics of FM and CFS. This study aimed to examine the effect of a brief multicomponent intervention based on physical activity (PA), nutrition, and chronobiology on movement behaviors (PA, sedentary and sleep time), muscle strength, and cardiorespiratory capacity.
View Article and Find Full Text PDFClin Nutr ESPEN
December 2024
Instituto da Criança do Hospital das Clínicas, School of Medicine, University of São Paulo, São Paulo, Brazil. Electronic address:
Background: Nutritional intervention during hospitalisation is vital in managing of children and adolescents in intensive care. In this context, body composition measurements, such as mid-upper arm circumference (MUAC), can help improve the accuracy of nutritional assessments. However, using MUAC has some limitations.
View Article and Find Full Text PDFChemosphere
December 2024
Food and Nutrition Department, National Institute of Health Doctor Ricardo Jorge, IP (INSA), Avenida Padre Cruz 1649-016 Lisboa, Portugal.
The aim of this study was to estimate the 18 to 74 years old Portuguese population's baseline exposure to inorganic arsenic, cadmium and lead and the risk of exceeding the respective Health Based Guidance Value, using a harmonised Total Diet Study (TDS) methodology. TDS food samples representative of the whole diet were prepared as consumed and analysed for total arsenic, cadmium and lead. European Food Safety Authority's conservative approach was used to estimate inorganic arsenic.
View Article and Find Full Text PDFJ Med Internet Res
December 2024
CYENS - Centre of Excellence, Nicosia, Cyprus.
Background: The development of wearable solutions for tracking upper limb motion has gained research interest over the past decade. This paper provides a systematic review of related research on the type, feasibility, signal processing techniques, and feedback of wearable systems for tracking upper limb motion, mostly in rehabilitation applications, to understand and monitor human movement.
Objective: The aim of this article is to investigate how wearables are used to capture upper limb functions, especially related to clinical and rehabilitation applications.
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