power

Power
  • 文章类型: Journal Article
    杏仁促进心脏代谢健康益处;然而,补充杏仁对运动恢复的作用研究较少。
    我们评估了原材料的影响,剥壳,杏仁疼痛,肌肉力量的产生,以及偏心率运动恢复过程中肌肉损伤和炎症的生化指标。
    使用随机化,交叉设计,26名健康成年人(37±6岁)以对应于最大耗氧量的65%-70%的心率下坡(-10%)30分钟,然后在8周适应ALMOND(2oz/d)或等热量椒盐脆饼(对照)喂养后进行3天的恢复期。志愿者在运行后立即和在恢复期间的每一天食用研究食物。收集了禁食的血液样本,在下坡跑步前和恢复72小时内测试疼痛和肌肉功能。
    下坡跑步引起中度肌肉损伤(时间:P<0.001;η2=0.395),肌酸激酶(CK)在24小时后达到峰值(对照:基线的Δ180%与ALMOND相比:基线的Δ171%)。72小时后,ALMOND的CK降低(从峰开始,Δ-50%;P<0.05),但对照组没有降低(从峰开始,Δ-33%;P>0.05)。在24小时(试验之间的Δ12%;P<0.05)和72小时(试验之间的Δ9%;P<0.05)时间点,ALMOND的最大屈曲扭矩大于对照(试验:P=0.004;η2=0.315)。在24h(试验之间的Δ-37%;P<0.05)和48h(试验之间的Δ-33%;P<0.05)后,ALMOND的最大收缩期间的疼痛较对照组低(试验:P<0.026;η2=0.225)。垂直跳力无差异(P>0.05),C反应蛋白浓度,肌红蛋白浓度,和总抗氧化能力在试验之间观察。
    这项研究表明,2.0盎司/天的杏仁可以适度减轻疼痛,更好地保持肌肉力量,并降低CK对偏心运动的反应。杏仁摄入对运动恢复的这种明显影响有可能促进运动依从性的增加,这应该在未来的研究中进行调查。该试验在clinicaltrials.gov注册为NCT04787718。
    UNASSIGNED: Almonds promote cardiometabolic health benefits; however, the ergogenic effect of almond supplementation on exercise recovery is less explored.
    UNASSIGNED: We evaluated the impacts of raw, shelled, almonds on pain, muscle force production, and biochemical indices of muscle damage and inflammation during recovery from eccentrically biased exercise.
    UNASSIGNED: Using a randomized, crossover design, 26 healthy adults (37 ± 6 y) ran downhill (-10%) for 30 min at a heart rate corresponding to 65%-70% of maximal oxygen consumption followed by 3-d recovery periods after 8-wk adaptations to either ALMOND (2 oz/d) or isocaloric pretzel (CONTROL) feedings. Volunteers consumed the study food immediately following the run and each day during recovery. Fasted blood samples were collected, and pain and muscle function were tested before the downhill run and over 72 h of recovery.
    UNASSIGNED: Downhill running elicited moderate muscle damage (Time: P < 0.001; η2 = 0.395) with creatine kinase (CK) peaking after 24 h (CONTROL: Δ + 180% from baseline compared with ALMOND: Δ + 171% from baseline). CK was reduced after 72 h in ALMOND (Δ - 50% from peak; P < 0.05) but not CONTROL (Δ - 33% from peak; P > 0.05). Maximal torque at 120°/s of flexion was greater (Trial: P = 0.004; η2 = 0.315) in ALMOND compared with CONTROL at 24 h (Δ + 12% between trials; P < 0.05) and 72 h (Δ + 9% between trials; P < 0.05) timepoints. Pain during maximal contraction was lower (Trial: P < 0.026; η2 = 0.225) in ALMOND compared with CONTROL after 24 h (Δ - 37% between trials; P < 0.05) and 48 h (Δ - 33% between trials; P < 0.05). No differences (P > 0.05) in vertical jump force, C-reactive protein concentrations, myoglobin concentrations, and total antioxidant capacity were observed between trials.
    UNASSIGNED: This study demonstrates that 2.0 oz/d of almonds modestly reduces pain, better maintains muscle strength, and reduces the CK response to eccentric-based exercise. This apparent effect of almond ingestion on exercise recovery has the potential to promote increased exercise adherence, which should be investigated in future studies.This trial was registered at the clinicaltrials.gov as NCT04787718.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

       PDF(Pubmed)

  • 文章类型: Journal Article
    88年来,生物学家和工程师试图了解使海豚能够以似乎超出其能量能力的速度游泳的流体动力学,一种被称为格雷悖论的现象。计算游泳海豚阻力的流体力学模型估计持续高速游泳的动力需求,这在生理上是不可能的。使用一架无人驾驶的飞行器,我们计算了速度从0.9到6.9ms-1的自由放养的昏暗海豚(Lagenorhynchusobscurus)的总功率,得出了阻力系数(Cd)和阻力。我们的结果表明,Cd随速度呈指数下降,在速度>2ms-1时将阻力降低高达89%,在波波过程中(>4.0ms-1)额外降低17%。在6.9ms-1时,阻力为32N,功率为15.8Wkg-1,几乎与其他哺乳动物的最大有氧能力的质量特异性异速预测相同,并且在生理上可能。速度>2.5ms-1时的Cd表明海豚身体周围边界层的湍流减少,从而减少阻力。昏暗海豚持续高速游泳的能力是由于Cd呈指数下降,通过海豚进一步减少了,从而解释了解决格雷悖论的低阻力和运动能力。
    For 88 years, biologists and engineers have sought to understand the hydrodynamics enabling dolphins to swim at speeds seemingly beyond their energetic capabilities, a phenomenon known as Gray\'s paradox. Hydromechanical models calculating the drag of swimming dolphins estimated power requirements for sustained high-speed swimming, which were physiologically impossible. Using an uncrewed aerial vehicle, we calculated the total power of free-ranging dusky dolphins (Lagenorhynchus obscurus) at speeds from 0.9 to 6.9 m s-1, deriving drag coefficients (Cd) and drag. Our results showed that the Cd decreased exponentially with speed, reducing drag by up to 89% at speeds >2 m s-1, with an additional 17% reduction during porpoising (>4.0 m s-1). At 6.9 m s-1, drag was 32 N, with a power of 15.8 W kg-1, nearly identical to the mass-specific allometric prediction for the maximum aerobic capacity of other mammals and physiologically possible. The Cd at speeds >2.5 m s-1 indicated reduced turbulence in the boundary layer around the dolphin\'s body, thereby reducing drag. The ability of dusky dolphins to swim at sustained high speeds resulted from an exponential decrease in Cd, which was further reduced by porpoising, thereby explaining the low drag and locomotory power that resolved Gray\'s paradox.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    这项研究考察了向前滑冰的力和速度特征与冰外速度之间的关系,敏捷性,以及训练有素的青少年冰球运动员的力量。邀请参加魁北克冰球联合会淡季评估营的球员参加这项研究。最终样本由107名训练有素的青少年冰球运动员组成(男性:n=38;13.83±0.38岁;女性:n=69:14.75±0.90岁)。在44m滑冰冲刺期间确定了个体力-速度曲线(F-V)。离冰速度,敏捷性,使用30米冲刺测量功率,5-10-5敏捷性,站立跳远。通过相关分析和多变量协方差分析(MANCOVA)分析了F-V机械能力与冰外指标之间的关联。汇总数据的结果表明,三项冰外措施与F0和V0具有中度关联,与Pmax具有较大关联。与Rfmax的关联,Drf,Sfv中等至小。F0与女性球员的冰外表现具有更强的关联,而V0对男性球员更为重要。MANCOVA将5-10-5倍确定为F0的更好预测因子,而30m冲刺时间则更好地预测V0。为了最大限度地发挥滑冰能力的身体属性,鼓励从业者专注于训练有素的青少年球员的一般身体准备。优先考虑使用方向或加速度和线速度变化的练习类型应该对冰上的F0和V0有不同的影响。
    This study examines the associations between force and velocity characteristics of forward skating and off-ice speed, agility, and power of highly trained teenage ice hockey players. Players attending the Quebec ice hockey federation\'s off-season evaluation camp were invited to participate in this study. Final sample consists of 107 highly trained teenage ice hockey players (Males: n = 38; 13.83 ± 0.38 years; Females: n = 69: 14.75 ± 0.90 years). Individual force-velocity profiles (F-V) were determined during a 44 m skating sprint. Off-ice speed, agility, and power were measured using 30 m sprint, 5-10-5 agility, and standing long jump. Associations between F-V mechanical capabilities and off-ice indicators were analyzed with correlational analyses and multivariate analysis of covariance (MANCOVA). Results of pooled data indicate that the three off-ice measures had moderate associations with F0 and V0 and large associations with Pmax. Associations with Rfmax, Drf, and Sfv were moderate to small. F0 had stronger associations with off-ice performance in female players while V0 was more important with male players. MANCOVA identified 5-10-5 times as the better predictor for F0 while 30 m sprints times better predicted V0. To maximize physical attributes of skating ability, practitioners are encouraged to focus on a general physical preparation for highly trained teenage players. Prioritizing types of exercises that use change of direction or acceleration and linear speed should have distinct effects on F0 and V0 on the ice.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    目的:在临床研究的背景下,越来越需要新的研究设计来帮助整合现有数据。在历史控制的帮助下,现有信息可用于支持新的研究设计,但是当然,纳入研究结果也存在偏倚的风险。
    方法:为了结合历史和随机对照,我们研究了填充设计,第一步检查执行等效性预测试的历史对照和随机对照的可比性。如果等价得到确认,历史控制数据将包含在新的RCT中。如果不能确认等价,将根本不考虑历史对照,并且将延长原始研究的随机化.我们正在研究该研究设计在I型错误率和功率方面的性能。
    结果:我们证明了在填充设计的两个步骤中,需要招募多少患者,并表明设计的家庭错误率保持在5%。填充设计的最大样本量大于没有历史控件的单阶段设计,并且随着历史控件和并发控件之间的异质性增加而增加。
    结论:两阶段填充设计代表了一种包括各种研究设计的历史控制数据的频繁方法。由于设计的最大样本量较大,一个强大的先验信念对于它的使用是必不可少的。因此,在认为需要混合设计的特殊情况下,该设计应被视为一种出路。
    OBJECTIVE: In the context of clinical research, there is an increasing need for new study designs that help to incorporate already available data. With the help of historical controls, the existing information can be utilized to support the new study design, but of course, inclusion also carries the risk of bias in the study results.
    METHODS: To combine historical and randomized controls we investigate the Fill-it-up-design, which in the first step checks the comparability of the historical and randomized controls performing an equivalence pre-test. If equivalence is confirmed, the historical control data will be included in the new RCT. If equivalence cannot be confirmed, the historical controls will not be considered at all and the randomization of the original study will be extended. We are investigating the performance of this study design in terms of type I error rate and power.
    RESULTS: We demonstrate how many patients need to be recruited in each of the two steps in the Fill-it-up-design and show that the family wise error rate of the design is kept at 5 % . The maximum sample size of the Fill-it-up-design is larger than that of the single-stage design without historical controls and increases as the heterogeneity between the historical controls and the concurrent controls increases.
    CONCLUSIONS: The two-stage Fill-it-up-design represents a frequentist method for including historical control data for various study designs. As the maximum sample size of the design is larger, a robust prior belief is essential for its use. The design should therefore be seen as a way out in exceptional situations where a hybrid design is considered necessary.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    本系统综述探讨了基于自然的护理环境如何影响心理健康治疗的参与。我们依靠JoannaBriggsInstitute的系统评价指南来综合从PubMed检索到的649条记录的初始池中选择的九篇文章的数据,CINAHL,ScienceDirect,Socindex,和JBIEPB。综合显示了六个分析主题:自然作为治疗工具,治疗关系,自然对功率平衡的影响,自然是一个安全的空间,自然风险和以病人为中心的护理。研究结果揭示了益处,同时强调了影响参与心理健康干预的一些挑战。研究结果表明,将自然纳入精神卫生保健可能是增强患者参与度的替代或补充方法。然而,具体的精神保健类型对这种影响各不相同。建议进行强有力的临床试验,以检查报告的益处的有效性。这些研究必须针对特定的患者群体,比如年轻人和老年人。需要进行纵向研究,以检查长期影响和调节因素,以加强证据基础并加强以患者为中心的护理。
    This systematic review explored how nature-based care settings influence engagement in mental health therapy. We relied on Joanna Briggs Institute\'s guidelines for systematic reviews to synthesise data from nine articles selected from an initial pool of 649 records retrieved from PubMed, CINAHL, ScienceDirect, SocINDEX, and JBI EPB. Synthesis revealed six analytical themes: nature as a therapeutic tool, therapeutic relationships, nature\'s impact on power balance, nature as a safe space, risk of nature and patient-centered care. The findings shed light on the benefits while highlighting some challenges that influence participation in mental health interventions. The findings suggest that integrating nature into mental health care could be an alternative or complementary approach to enhancing patient engagement. However, the specific types of mental health care of this impact vary. Robust clinical trials that examine the effectiveness of the reported benefits are recommended. Such studies must target specific patient groups, such as the young and the elderly. Longitudinal studies that examine the long-term effects and moderating factors are needed to strengthen the evidence base and enhance patient-centered care.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    实践理论提供了揭示的潜力,理解,并将价值归因于痴呆症护理人员的日常思想和行为。利用南非农村研究的人种学数据,关于日常痴呆症护理实践,我们强调了平凡的做法-特别是“坐着等待”-对于优化在家中照顾的痴呆症患者的福祉的深远重要性。我们提请注意家庭(非正式)护理的结构性驱动因素,这是国家不作为的基础。这将坐着等待的行为定位为一种护理行为和结构性无能为力的体现形式。
    Practice theories offer potential to reveal, understand, and attribute value to the everyday thoughts and actions of dementia caregivers. Drawing on ethnographic data from research in rural South Africa, on everyday dementia care practices, we highlight the profound importance of mundane practices - especially \"sitting in wait\" - for optimizing wellbeing of people with dementia who are cared for at home. We draw attention to the structural drivers of homebased (informal) care, which is underpinned by state inaction. This situates the act of sitting in wait as both an act of care and an embodied form of structural powerlessness.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    背景:关于研究人员与有生活经验的人之间共同生产的指南于2018年由美国国立卫生与护理研究所(NIHR)咨询小组发布,以前称为involve。该指南将分享权力描述为联合制作中的关键原则。然而,在共同制作的心理健康研究中真正的权力分享并不总是发生,在许多项目中仍然是一个挑战。
    目的:探讨自本指南发布以来,在精神卫生研究中关于共同生产中的权力共享的知识,通过综合与共同生产的心理健康研究中的权力有关的定性文献。
    方法:我们进行了主题综合的系统综述。我们搜索了NHAL,Embase和PubMed数据库,以确定与共同生产的心理健康研究中的权力有关的定性或混合方法研究。研究由两名评审员独立筛选,并使用关键评估技能计划工具(CASP)进行定性研究。
    结果:我们确定了9篇符合纳入标准的论文,并纳入了综合。产生了三个主题:(1)与更强大的系统争夺权力,(2)通过关系赋予权力;(3)旅程动荡,但它不应该是光滑的。
    结论:结果强调权力无处不在,特别是在分层系统内,研究往往是在内部进行的。在共同生产的心理健康研究中分享权力是一个正在进行的复杂过程,并不容易。尊重信任关系有助于促进权力分享。然而,最终有意义的变革需要来自研究资助者,大学和NHS提供商。
    该研究的作者包括一位为评论设计做出贡献的生活经验研究员,分析和写作。
    BACKGROUND: Guidance on co-production between researchers and people with lived experience was published in 2018 by the National Institute for Health and Care Research (NIHR) advisory group, previously known as INVOLVE. This guidance described sharing power as a key principle within co-production. Authentic sharing of power within co-produced mental health research does not always occur however and remains a challenge to achieve within many projects.
    OBJECTIVE: To explore what has been learned about the sharing of power in co-production within mental health research since the publication of these guidelines, by synthesising qualitative literature relating to power within co-produced mental health research.
    METHODS: We carried out a systematic review with thematic synthesis. We searched CINHAL, Embase and PubMed databases to identify qualitative or mixed-method studies relating to power within co-produced mental health research. Studies were independently screened by two reviewers for inclusion and appraised using the Critical Appraisal Skills Programme tool (CASP) for qualitative research.
    RESULTS: We identified nine papers that met the criteria for inclusion and were included in the synthesis. Three themes were generated: (1) Battling to share power against a more powerful system, (2) Empowerment through relationships and (3) The journey is turbulent, but it is not supposed to be smooth.
    CONCLUSIONS: Results highlight that power is pervasive, especially within the hierarchical systems research is often conducted within. Sharing power within co-produced mental health research is an ongoing complex process that is not intended to be easy. Respectful trusting relationships can help facilitate power sharing. However, ultimately meaningful change needs to come from research funders, universities and NHS providers.
    UNASSIGNED: The study authors include a lived experience researcher who contributed to the review design, analysis and write-up.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

       PDF(Pubmed)

  • 文章类型: Journal Article
    许多临床试验涉及部分聚类数据,其中一些观察属于一个集群,另一些可以被认为是独立的。例如,新生儿试验可能包括单胎或多胎婴儿.这些试验的样本量和分析方法受到的关注有限。进行了模拟研究,以(1)评估基于广义估计方程(GEE)的现有功率公式是否为混合效应模型获得的功率提供了足够的近似值,(2)比较混合模型与GEE在估计治疗对连续结果的影响方面的表现。我们考虑了在随机化之前存在的聚类,最大聚类大小为2,三种随机化聚类观察的方法,根据具有独立或可交换工作相关结构的基于GEE的公式,以及具有无信息簇大小和实现80%功率所需的样本大小的模拟数据集。当使用可交换GEE公式计算样本量时,混合模型方法的经验功效接近标称水平,但当样本量基于独立性GEE公式时,往往太高。独立性GEE在所有情况下始终融合并表现良好。可交换GEE和混合模型的性能在聚类随机化下也是可以接受的,尽管其他随机化方法可能会出现覆盖范围不足和I型错误率膨胀。使用具有独立工作相关结构的GEE进行部分聚类试验的分析可能是优选的,以避免混合模型和可交换GEE的限制。
    Many clinical trials involve partially clustered data, where some observations belong to a cluster and others can be considered independent. For example, neonatal trials may include infants from single or multiple births. Sample size and analysis methods for these trials have received limited attention. A simulation study was conducted to (1) assess whether existing power formulas based on generalized estimating equations (GEEs) provide an adequate approximation to the power achieved by mixed effects models, and (2) compare the performance of mixed models vs GEEs in estimating the effect of treatment on a continuous outcome. We considered clusters that exist prior to randomization with a maximum cluster size of 2, three methods of randomizing the clustered observations, and simulated datasets with uninformative cluster size and the sample size required to achieve 80% power according to GEE-based formulas with an independence or exchangeable working correlation structure. The empirical power of the mixed model approach was close to the nominal level when sample size was calculated using the exchangeable GEE formula, but was often too high when the sample size was based on the independence GEE formula. The independence GEE always converged and performed well in all scenarios. Performance of the exchangeable GEE and mixed model was also acceptable under cluster randomization, though under-coverage and inflated type I error rates could occur with other methods of randomization. Analysis of partially clustered trials using GEEs with an independence working correlation structure may be preferred to avoid the limitations of mixed models and exchangeable GEEs.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

  • 文章类型: Journal Article
    动态力量指数(DSI)计算为反动跳跃(CMJ)峰值力与等距大腿中部拉力(IMTP)峰值力之间的比率,据说可以告知给定运动员是否需要弹道或力量训练。这项研究评估了个性化的季节阻力训练计划的影响,由DSI指导篮球运动员的身体表现。将43名精英运动员(19.4±2.9岁;1.97±0.08cm;89.1±9.5kg)分为干预组(IG)(27名)和对照组(CG)(16名)。IG根据DSI进一步分为弹道组(DSI≤0.90,11名球员)和力量组(DSI>0.90,16名球员)。五个多星期,参与者每周进行两次抵抗训练,IG遵循基于DSI的程序,CG遵循标准程序。通过20米冲刺在干预前后测量性能,505变向试验,CMJ,IMTP。IG有统计学上的显着改善,特别是在冲刺时间(η2=0.12-0.21,p<0.05)和505测试(η2=0.15-0.16,p<0.05)中,主要是实力组。对于不同的变量,CG的表现要么不变,要么下降。我们的结果表明,DSI指导的训练有效地提高了篮球运动员在竞争赛季中的身体表现。
    The dynamic strength index (DSI) is calculated as the ratio between countermovement jump (CMJ) peak force and isometric mid-thigh pull (IMTP) peak force and is said to inform whether ballistic or strength training is warranted for a given athlete. This study assessed the impact of an individualized in-season resistance training program, guided by DSI on basketball players\' physical performance. Forty-three elite players (19.4 ± 2.9 years; 1.97 ± 0.08 cm; 89.1 ± 9.5 kg) were divided into an intervention group (IG) (27 players) and a control group (CG) (16 players). The IG was further split based on DSI into a ballistic group (DSI ≤ 0.90, 11 players) and a strength group (DSI > 0.90, 16 players). Over five weeks, participants underwent two weekly resistance sessions, with the IG following a DSI-based program and the CG a standard program. Performance was measured pre- and post-intervention through 20-m sprints, 505 change of direction test, CMJ, and IMTP. There were statistically significant improvements in the IG, notably in sprint times (η2 = 0.12-0.21, p < 0.05) and 505 test (η2 = 0.15-0.16, p < 0.05), predominantly in the strength group. The CG\'s performance was either unchanged or declined for different variables. Our results suggest that DSI-guided training effectively enhances basketball players\' physical performance within a competitive season.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

       PDF(Pubmed)

  • 文章类型: Journal Article
    美国的收债业与不断上升的债务同步增长。先前关于债务和心理健康的研究主要将债务视为一种资源和责任,而不是债权人和债务人之间的权力关系。我们使用来自1997年青年队列国家纵向调查的数据(N=7,236)研究了债务收集压力的心理健康后果。借鉴压力理论和健康动力资源理论,我们认为收款压力是一种关系压力源,通过与收债员的负面互动来破坏福祉,财务压力,角色应变,和耻辱。我们发现,在这一群体中,每四个年轻人中就有一个在40岁左右面临收债压力,低收入和黑人年轻人的比率更高。个体固定效应和滞后因变量回归模型表明,债务回收压力与心理困扰增加有关,在低收入的年轻人中造成更严重的后果。
    The debt collection industry in the United States has grown in tandem with rising indebtedness. Prior research on debt and mental health mainly treats debt as a resource and liability rather than a power relationship between creditors and debtors. We study the mental health consequences of debt collection pressure using data from the National Longitudinal Survey of Youth-1997 Cohort (N = 7,236). Drawing on stress theory and health power resources theory, we posit collection pressure as a relational stressor that undermines well-being through negative interactions with debt collectors, financial strain, role strain, and stigma. We find that one of every four young adults in this cohort faced debt collection pressure by around age 40, with higher rates among low-income and Black young adults. Individual fixed-effects and lagged dependent variable regression models indicate that debt collection pressure is associated with increased psychological distress, with more severe consequences among low-income young adults.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

    求助全文

公众号