Cardiorespiratory fitness and telomere length: a systematic review

ABSTRACT

This study aimed to systematically review the association between cardiorespiratory fitness and telomere length (TL). Studies were identified from searches in Cochrane Central, PubMed, Scopus, Sportdiscus, and Web of Science databases through July 2019. Eligibility criteria included: cross-sectional, prospective, and experimental study design; outcomes included TL; results expressed the relationship between cardiorespiratory fitness and TL; studies published in English, Portuguese, or Spanish. A total of 20 articles met the inclusion criteria. Sixteen studies (80%) reported a significant relationship between cardiorespiratory fitness, or training load, and TL. Better cardiorespiratory fitness or a large cardiorespiratory training load are associated with an increase in TL. Although, TL was related to regular moderate-to-vigorous aerobic exercise and cardiorespiratory fitness in older healthy humans, it was not related to cardiorespiratory fitness among young subjects. There seems to be a positive and significant relationship between cardiorespiratory fitness and TL, mainly among middle age and older people, which emphasizes the importance of cardiorespiratory fitness for healthy ageing. Therefore, endurance exercise and better cardiorespiratory fitness may regulate the TL in middle age and older adults, slowing the cellular ageing process.     

Validity of the activPAL and Height-Adjusted Curvilinear Cadence-METs Equations in Healthy Adults

ABSTRACT

The activPAL is a widely-used measure of sedentary time but few studies have evaluated its ability to estimate physical activity intensity. This study determined the accuracy of the algorithm used by the activPAL to predict metabolic equivalents (METs) from cadence and a curvilinear cadence-METs equation individualized for height. Thirty-six healthy adults (25 ± 6 years) completed a progressive walking protocol. Stepping cadence was video recorded and METs were determined via indirect calorimetry. Manually-counted cadence was input into the activPAL and curvilinear equations. The internal activPAL equation overpredicted METs at slower cadences (<120 steps/minute) but underpredicted METs at faster cadences (>120 step/minute) (proportional bias, p < .001). Conversely, the curvilinear equation exhibited neither fixed (p = .37) nor proportional bias (p = .07), and a lower absolute MET difference [0.87 ± 0.65 (range:0.0–3.2) vs. 0.56 ± 0.45 (range:0.0–2.7) METs]. The linear activPAL equation poorly estimates METs from stepping cadence but these inaccuracies may be lessened through the use of an individualized curvilinear equation.     

植物活体材料即时解离压片法在科研实验教学中的应用

植物活体材料即时解离压片法，是观察研究植物有丝裂过程中染色体的各种行为形态的既简便又有效的方法。将这种方法应用到学生的观察实验中，与永久封片观察法相比更能提高学生的实验兴趣和深化书本知识的程度。     

体育的哲学宣言——“人的自然化”

“自然的人化”是马克思的哲学命题。“自然的人化”是人类征服自然获取能量的最根本生存方式。但在这个不可逆转的过程中，人类的身心却付出了极大的代价。于是，在“自然的人化”过程中，必须补充“人的自然化”。“人的自然化”是中国哲学家李泽厚的创见。体育运动的历史意义恰恰在于“人的自然化”，在于拣回业已苍瘪的动物力度，在于扶正已被理性大厦压倒的感性生命，在于避免现实生活中对身心健康的各种异化。     

身体活动提高青少年自尊水平机制的分析

在近年来国内外该领域研究的基础上，试分析身体活动提高青少年自尊水平的机制。     

山东省大学生运动损伤的调查分析

本对山东省大学生参加体育运动时发生运动损伤的情况进行了调查分析，对预防和减少运动损伤的对策进行讨论并提出建议。     

论学科核心素养形成的机制

学科核心素养是指学生通过某学科的学习而逐步形成的关键能力、必备品格与价值观念。学科知识与学科活动是学科核心素养形成的两翼,学科知识是学科核心素养形成的主要载体,学科活动是学科核心素养形成的主要路径。为了有效促成学科核心素养的形成,作为载体的学科知识,应突出强调学科大概念、学科结构、学科思想与方法及学科情境四大要素。作为路径的学科活动,必须体现实践性、思维性、自主性、教育性和学科性五大特性。     

略论教师教学中的审美实践

教学活动不仅具有传授知识的教育功能 ,还有实施、激励情感的审美功能。教师的审美实践是教师教学水平和综合素养的体现 ,更是实施素质教育的必然要求     

开辟语文第二课堂让学生在活动中学习和提高

语文学习的外延等于生活的外延。语文学科的工具性决定了语文第二课堂是存在的必然。活动和交往是发展的源泉，语文第二课堂在发展学生思维、提高智力、培养兴趣、学会合作等方面有着积极的意义。其内容形式灵活多样，实施时注意处理好独立、自主几个原则。     

刘盥训及其遗著

文章介绍清末山西临猗人刘盥训的生平,及其遗著《刘盥训日记》和相关著作。