Abstract:
OBJECTIVES:To investigate whether psychosocial variables mediate the effect of a multicomponent intervention on screen time reduction among Brazilian students from schools located in vulnerable areas. DESIGN:A cluster-randomized controlled trial with a 4-month follow-up. METHODS:This study was conducted with 1085 students (548 in the intervention group and 537 in the control group), aged 11-17years. The intervention strategies focused on training teachers, increasing opportunities for physical activity at school, and reducing screen time, as well as health education. The questionnaire was administered before and after intervention with questions about the amount of time spent on TV and computer/video games on weekdays and weekend days (combined screen time). The potential psychosocial mediators (attitude, self-efficacy, family and school support) were measured through validated scales. Socioeconomic status was used as control variable. Multilevel mediation analyses were conducted using a product-of-coefficients test. RESULTS:Psychosocial factors were not mediators of the effect of the intervention on screen time. The intervention significantly improved school support for both sexes (boys: 1.307; girls: 0.759; p<0.05) and older students (1.154; p<0.001). Attitude (boys: -0.228; 11-13years: -0.133; 14-17years: -0.152; p<0.05) and self-efficacy scales (boys: -0.040; girls: -0.104; 11-13years: -0.048; 14-17years: -0.100; p<0.05) were associated with reduced screen time. CONCLUSIONS:The intervention produced a significant improvement of school support for both sexes, as well as older students. Enhancing attitude and self-efficacy may be a useful strategy for reducing screen time among boys and students of any age groups. TRIAL REGISTRATION:ClinicalTrials.Gov: NCT02439827. Registration date: May 3, 2015.
journal_name
J Sci Med Sportjournal_title
Journal of science and medicine in sportauthors
Bandeira ADS,Silva KS,Bastos JLD,Silva DAS,Lopes ADS,Barbosa Filho VCdoi
10.1016/j.jsams.2019.09.004subject
Has Abstractpub_date
2020-03-01 00:00:00pages
264-269issue
3eissn
1440-2440issn
1878-1861pii
S1440-2440(19)31258-7journal_volume
23pub_type
杂志文章,随机对照试验abstract:OBJECTIVES:We aimed to clarify whether a short-term whole body vibration training has a beneficial effect on bone mass and structure in elderly men and women. DESIGN:Randomised controlled trial. METHODS:A total of 49 non-institutionalised elderly (20 men and 29 women) volunteered to participate in the study. Particip...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1016/j.jsams.2013.04.020
更新日期:2014-03-01 00:00:00
abstract:OBJECTIVES:Muscle damage symptoms induced by unaccustomed eccentric contraction exercise can be reduced by repeating the experience several times. This phenomenon is termed the repeated bout effect. Although traditional biochemical markers require invasive blood sampling, biochemical measurements have recently been dev...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2019.12.023
更新日期:2020-06-01 00:00:00
abstract:OBJECTIVES:To examine how clinically measured hip motion is related to shoulder biomechanics during the pitching motion. DESIGN:Cross-sectional. METHODS:Bilateral hip rotational range of motion was measured clinically among 34 collegiate baseball pitchers. External rotation torque and maximum horizontal adduction ran...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2014.07.011
更新日期:2015-09-01 00:00:00
abstract:OBJECTIVES:The health benefits from participation in half-marathon is challenged by a yearly running-related injury (RRI) incidence proportion exceeding 30%. Research in injury etiology is needed to successfully prevent injuries. The body's load capacity is believed to play an essential role for injury development. The...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2018.08.014
更新日期:2019-03-01 00:00:00
abstract:OBJECTIVES:Sponsorship by manufacturers of unhealthy food can undermine the health promoting goals of sport. This study aimed to describe Australian children's exposure to organised sport, and compare time spent in specific sports with patterns of sponsorship of children's sport identified in previous studies. DESIGN:...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2013.07.005
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVES:To compare catastrophic injury rates between the 14 South African Provincial Rugby Unions. DESIGN:A prospective, population-based study conducted among all South African Unions between 2008-2014. METHODS:Player numbers in each Union were obtained from South African Rugby's 2013 Census. Catastrophic injurie...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2017.01.232
更新日期:2017-07-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to investigate if and to what extent small lateral wedges inserted under the ski boot, known as canting, could impact knee kinematics/kinetics, balance, and neuromuscular activity in recreational alpine skiers in the laboratory setting. DESIGN:Experimental, crossover study with rep...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2020.05.009
更新日期:2020-05-17 00:00:00
abstract::The purpose of this study was to determine if three training loads equated by volume differed in terms of the temporal, kinematic and kinetic characteristics of each set. Twelve experienced weightlifters (30.2+/-10.6 years old and 75.8+/-13.0 kg) performed three sets (6 x 30% 1RM, 3 x 60% 1RM and 2 x 90% 1RM) of balli...
journal_title:Journal of science and medicine in sport
pub_type: 临床试验,杂志文章
doi:10.1016/s1440-2440(04)80004-5
更新日期:2004-06-01 00:00:00
abstract::The benefit of job-related employment standards in physically demanding occupations are well known. A number of methodological frameworks have been established to guide the development of physical employment standards for single job functions. In the case of an organisation comprised of multiple and diverse employment...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,评审
doi:10.1016/j.jsams.2018.02.008
更新日期:2018-11-01 00:00:00
abstract:UNLABELLED:Health benefits from children's independent mobility and active travel beyond school travel are largely unexplored. OBJECTIVES:This review synthesized the evidence for associations of independent mobility and active travel to various destinations with physical activity, sedentary behaviour and weight status...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,评审
doi:10.1016/j.jsams.2012.11.001
更新日期:2013-07-01 00:00:00
abstract:OBJECTIVES:This study explores the reliability and validity of the SenseWear Armband (SWA) and Actical (ACT) for free-living total energy expenditure, and energy expenditure during rest and light-to-moderate exercises (walking, ergocycling). DESIGN:Participants wore the 2 devices during 7 days (free-living) and then p...
journal_title:Journal of science and medicine in sport
pub_type: 临床试验,杂志文章
doi:10.1016/j.jsams.2014.11.001
更新日期:2016-01-01 00:00:00
abstract:OBJECTIVES:To compare the efficacy of two exercise programmes in reducing pain and disability for individuals with non-specific low back pain and to examine the underlying mechanical factors related to pain and disability for individuals with NSLBP. DESIGN:A single-blind, randomized controlled trial. METHODS:Eighty p...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.jsams.2014.11.006
更新日期:2015-11-01 00:00:00
abstract::This study examined the effects of active warm up on thermoregulatory responses and intermittent-sprint cycle performance in hot conditions (35.5+/-0.6 degrees C, RH 48.7+/-3.4%). Eight trained males performed a 36-min, intermittent-sprint test (IST) after no (WUP 0), 10-min (WUP 10) or 20-min warm up (WUP 20). The IS...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2007.05.013
更新日期:2009-01-01 00:00:00
abstract::This study was designed to compare the acute effect of vibration exercise with a concentric-only activity (arm cranking) on concentric-only muscle action using an upper body isoinertial exercise. Twelve healthy, physically active men, 30.0y+/-6.1 (mean+/-S.D.); height 1.81m+/-0.06; and weight 83.4kg+/-9.7, performed f...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2007.04.006
更新日期:2008-11-01 00:00:00
abstract:OBJECTIVES:Rugby Union has adapted the Sports Concussion Assessment Tool (SCAT) into an abridged off-field concussion screen and the complete SCAT is used during diagnostic screens performed after head impact events. No firm guidelines exist as to what should be considered "abnormal" and warrant further evaluation. Thi...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2020.07.006
更新日期:2021-02-01 00:00:00
abstract::The aim of the present study was to evaluate and compare the upper-body aerobic fitness characteristics in 2 groups of competitive surfers with different performance levels. Thirteen male competitive surfers performed an incremental dry-land board paddling test to determine specific peak oxygen uptake (VO2peak), peak ...
journal_title:Journal of science and medicine in sport
pub_type: 临床试验,杂志文章
doi:10.1016/s1440-2440(05)80023-4
更新日期:2005-03-01 00:00:00
abstract::To examine the strength and direction of the relationship between physical activity level, screen use and BMI in a cohort at ages 6, 8, 10 and 14 yrs as part of a prospective longitudinal cohort study. The sample comprised 1403 males and females who participated in the follow-up survey at 14 yrs of age between 2003 an...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2011.03.011
更新日期:2011-09-01 00:00:00
abstract:OBJECTIVES:This research explores snowsport injury trends in western Canadian resorts over the decade 2008-2018. DESIGN:Ecological study. METHODS:Injury and participation data on alpine skiing and snowboarding was provided by the Canada West Ski Areas Association for 2008-2018. Inclusion criteria were met by 29 of 52...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2020.12.001
更新日期:2020-12-11 00:00:00
abstract:OBJECTIVES:To examine the effects of shoe type and stride length reduction on lower-extremity running mechanics and cumulative loading. DESIGN:Within-subject with four conditions: (1) control shoe at preferred stride length; (2) control shoe at 90% preferred stride length; (3) minimalist shoe at preferred stride lengt...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2016.03.003
更新日期:2016-12-01 00:00:00
abstract:OBJECTIVES:Tendinopathy, the most prevalent tendon disorder which is considered as the clinical diagnosis of pain and dysfunction, is common in sports and its prevalence is ever-increasing. Despite the lack of clarity about risk factors, various preventive interventions for tendinopathy have been investigated. The main...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,评审
doi:10.1016/j.jsams.2015.03.008
更新日期:2016-03-01 00:00:00
abstract:OBJECTIVES:The purpose of this study was to examine whether the use of machine learning improved the ability of a neuromuscular screen to identify injury risk factors in elite male youth football players. DESIGN:Prospective cohort study. METHODS:355 elite youth football players aged 10-18 years old completed a prospe...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2020.04.021
更新日期:2020-11-01 00:00:00
abstract::The aim of this study was to examine the effects of an early dismissal (after 5-min play) on work-rate in a professional soccer match. A computerised player tracking system was used to assess the work-rates of seven players who completed the match on a team with 10 players. A minute-by-minute analysis of the remaining...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2008.09.004
更新日期:2010-01-01 00:00:00
abstract:OBJECTIVES:Military-, rescue- and law-enforcement personnel require a high physical capacity including muscular strength. The present study hypothesized that 9 weeks of volume matched concurrent short frequent training sessions increases strength more efficiently than less frequent longer training sessions. DESIGN:A r...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2020.03.013
更新日期:2020-10-01 00:00:00
abstract::This study examined the thermoregulatory responses in field hockey goalkeepers during games (Part A), and assessed the effect of heat stress on hockey-specific response time (Part B). In Part A, core temperature (T(c)), skin temperature (T(sk)), body mass, fluid consumption and heart rate (HR) responses of six goalkee...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2009.03.009
更新日期:2010-05-01 00:00:00
abstract:OBJECTIVES:To profile multi-year injury incidence and severity trends in elite junior tennis players from a national program. DESIGN:Prospective cohort. METHODS:Injury data was collated by sex, age and region for all nationally-supported Australian junior players (58m, 43f 13-18y) between 2012-2016. Injury was define...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2018.06.006
更新日期:2019-01-01 00:00:00
abstract:OBJECTIVES:The aim was to examine the associations between level of physical activity (PA) and non-hospital medical costs, and between physical activity and hospitalisations in older women from 1999 to 2013. DESIGN:Longitudinal observational study. METHODS:Data were collected from participants in the Australian Longi...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2017.10.022
更新日期:2018-06-01 00:00:00
abstract:OBJECTIVES:To examine urban/rural differences in children's independent mobility; associations between mobility licences and children's independent mobility; and potential correlates of mobility licences. DESIGN:Cross-sectional study of 430 primary (48% boys; 72% urban) and 258 secondary schoolchildren (52% boys; 51.6...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2012.03.005
更新日期:2012-11-01 00:00:00
abstract::The aim was to investigate the effects of fatigue induced by electrical stimulation superimposed onto voluntary muscular contractions on postural abilities and strategy (n=8). Two groups of subjects performed a fatiguing of the triceps surae, the first by voluntary muscular contractions (group VOL) and the second (n=8...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2007.10.006
更新日期:2009-01-01 00:00:00
abstract:OBJECTIVES:Despite the known benefits of physical activity, the majority of adults in developed countries lead sedentary lifestyles. The community setting is a promising venue for physical activity-promoting interventions. Our objectives were to investigate the effectiveness of community-based physical activity interve...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,评审
doi:10.1016/j.jsams.2013.04.009
更新日期:2014-05-01 00:00:00
abstract:OBJECTIVES:This study examined whether young (15-19 years old) high-performance netball players exhibit different landing mechanics compared to female controls who do not participate in sports requiring frequent landings. DESIGN:Comparative, cross-sectional. METHODS:Lower limb kinematics and kinetics from 23 youth hi...
journal_title:Journal of science and medicine in sport
pub_type: 杂志文章
doi:10.1016/j.jsams.2019.08.017
更新日期:2020-01-01 00:00:00