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1.
Abstract

Performance differences between males and females have been attributed to both biological and cultural factors, although the relative significance of each has not been ascertained. Differences in body fatness between males and females has been frequently mentioned as one biological factor responsible for variations in physical performance. In children, it has been shown that boys exhibit slightly higher performance levels than girls until adolescence, when the differences favoring the boys become greater. The purpose of this study was to investigate the relationship between selected physical performance tests and body fatness in preadolescent boys and girls. Measures of age, height, weight, skinfold thicknesses at two sites, and performance scores on the vertical jump, standing broad jump, modified pullup, 40-yard dash, and 400-yard run were obtained on 563 elementary school children. The results of a one-way ANOVA indicated that there was a significant difference between boys and girls on all of the physical performance tests. Although the boys were slightly taller and heavier and scored better than the girls on the performance tests, there was no significant difference between the sexes in the sum of two skinfolds. Separate regression equations for the sum of two skinfolds by performance on each test indicated that, with the exception of the modified pullup test, body fatness was only marginally related to performance. These findings indicated that, although inversely related to the ability to move the total body weight, body fatness was of minimal importance in explaining performance differences between young boys and girls.  相似文献   

2.
优秀女子健身运动员体成分及其分布特征   总被引：4，自引：0，他引：4  
利用先进“Biospace”身体成份分析仪 ,通过对优秀女子健身运动员体成分特征其分布特征的研究 ,发现 :优秀女子健身运动员体脂及比率、体脂 /体重比值、肥胖度、腹部脂肪比率、总体液及比率、躯干体液及比率与正常人无显著性差异 (P >0 0 5 ) ;蛋白质及比率、瘦体重及比率、无脂体重及比率、无机质含量及比率均高于正常人 ,且具有非常显著性差异 (P <0 0 1) ;细胞内液、细胞内液 /外液比值均高于正常人 ,具有显著性差异 (P<0 0 5 )。细胞外液及比率低于正常人 ,具有显著性差异 (P <0 0 5 )  相似文献   

3.
BackgroundIncreasing caloric expenditure in physical education is considered an effective school-based approach to addressing the child obesity epidemic. This study was designed to determine synergistic influences of student characteristics and lesson factors on caloric expenditure in elementary and middle school physical education.MethodsThe study used a multi-level design. Level-1 factors included personal characteristics: age, gender, and body mass index. Level-2 factors included lesson length, content, and school level. Based on the Center for Disease Control and Prevention age–gender adjusted growth chart, students in 87 classes from 14 elementary and 15 middle schools were pre-screened into “Overweight”, “Healthy weight”, or “Thin” groups. One boy and one girl were randomly selected from each group in each class as data providers (264 elementary and 294 middle school students). Caloric expenditure was measured in 243 physical education lessons using accelerometers.ResultsAnalysis of variance revealed and hierarchical linear modeling confirmed separate age by body mass index, age by gender, and content by lesson–length interaction effects, suggesting that the personal and lesson factors influenced caloric expenditure independently. Older male and heavier students burned more calories in all lessons. Students burned more calories in 45–60 min sport skill or fitness lessons than in shorter (30 min) or longer (75–90 min) game or multi-activity lessons.ConclusionsThe hypothesized cross-level interaction was not observed in the data. Caloric expenditure can be optimized in 45–60 min sport skill or fitness development lessons. It can be recommended that schools adopt 45–60 min lesson length and provide skill and fitness development tasks in physical education to maximize caloric expenditure.  相似文献   

4.
Body dissatisfaction is a phenomenon that may already occur in childhood and is linked to a variety of psychosocial risks. As the role of physical activity in the context of body dissatisfaction is still ambivalent, a cross-sectional study with 602 normal weight children (50.2% girls; Mage?=?9.23 years; SD?=?0.79) was conducted. The children filled in the MoMo-Questionnaire, including items about their physical activities and motives for being physically active, as well as Bender’s Body Esteem and Muscularity Concern Scale with the three subscales “body satisfaction”, “weight and shape concerns”, and “muscularity concerns”. Independent t-tests revealed that girls were less worried about muscularity than boys (Mgirls?=?1.94, SDgirls?=?1.11 vs. Mboys?=?3.12, SDboys?=?1.43; t(560)?=?11.33, p?d?=?0.92), whereas girls showed greater weight and shape concerns than boys (Mgirls?=?2.24, SDgirls?=?0.97 vs. Mboys?=?2.05, SDboys?=?0.92; t(549)?=?2.32, p?=?.02, d?=?0.20). In boys, physical activity is associated with less muscularity, weight, and shape concerns. Body satisfaction increases with health and fitness motives. In girls, the role of physical activity is ambivalent: girls who engage in sports do not differ in body dissatisfaction from non-active girls. In sportive girls, weight and shape concerns increased with more health and fitness motives. Finally, the study provides first insights into body dissatisfaction and the different role of physical activity in boys and girls in childhood.  相似文献   

5.
Abstract

The purpose of this study was to compare regular and nonregular adult exercisers on selected physiological and personality measures over a four-year period. Forty-eight participants in the 1971 Purdue Adult Fitness Program were retested four years later. As a result three groups of 16 subjects each were established, based on responses to an Exercise and Leisure Questionnaire. Relevant physiological data were collected and physical fitness scores were obtained for each subject using the criterion of Ismail and others. Personality traits were assessed using the same form of the Cattell 16 Personality Factor Questionnaire as both pre- and posttests. The data were analyzed at both test periods using the ANOVA technique. The effect of different activity levels was assessed by several fitness parameters such as percent lean body weight, resting and submaximal heart rates, submaximal RQ, [Vdot]O2 max, and physical fitness score. The two regularly active groups increased significantly in physical fitness over the four-year period. At both test periods the regularly active group was significantly more confident (Factor O) than the other two groups, indicating that the relationship between physical fitness and self-confidence is stable.  相似文献   

6.
Abstract

A cross-sectional study was carried out to analyse, through a limited number of fitness tests, the main conditioning and coordinative abilities in children aged 8–9 years, and their relationship with gender, anthropometric variables and physical activity habits. The height and weight of 256 boys and 241 girls were measured and information about physical activity habits was collected using a self-administered questionnaire. Physical performance was assessed by means of a few standardised tests: ‘sit & reach’, medicine-ball forward throw, standing long jump, 20 m running speed, and forward roll test. In both boys and girls, body weight and Body Mass Index (BMI) were positively correlated with the medicine-ball throw performances and negatively correlated for the standing long jump and speed tests, while no association was found with tests measuring back flexibility and total body coordination. Daily physical activity and participation in sport were not significantly correlated with body weight and BMI, but were positively associated with children's motor performance. The standardised fitness tests selected in the current study have been found to be suitable to identify fitness levels of primary school children. Thanks to their limited number and ease of measurement, they can be used in any school context to classify children and for monitoring the effects of targeted interventions promoting physical activity.  相似文献   

7.
Abstract

We report the initial validation of a multi-component assessment model for monitoring training distress among athletes. The model combines measures of mood disturbance with measures of perceived stress and symptom intensity. Altogether, 492 athletes completed the 10-item Perceived Stress Scale (PSS-10; Cohen et al., 1983), the 24-item Brunel Mood Scale (BRUMS; Terry et al., 2003), and a checklist of 19 symptoms associated with acute overtraining (Fry et al., 1994). Six training distress factors were identified by an exploratory factor analysis: “depressed mood”, “perceived vigour”, “physical symptoms”, “sleep disturbance”, “perceived stress”, and “general fatigue”. Comparisons of group means of these factors with a previously validated inventory were consistent with theoretical predictions and provided evidence of construct validity. Internal consistency of the subscales was also confirmed, with Cronbach alphas ranging from 0.72 to 0.86. Together, these findings suggest that this multi-component model provides a sound conceptual basis for the assessment of training distress among athletes.  相似文献   

8.
This report aims to analyse the independent association of lean mass and muscle fitness with bone mineral content (BMC) and bone mineral density (BMD), and to examine whether the relationship between muscle fitness and bone health is mediated by lean mass. Body composition (by dual energy X-ray absorptiometry (DXA)), muscle fitness, physical activity, age and height were measured in 132 schoolchildren (62 boys, aged 8–11 years). Analysis of covariance tested differences in bone-related variables by lean mass and muscle fitness, controlling for different sets of confounders. Linear regression models fitted for mediation analyses examined whether the association between muscle fitness and bone mass was mediated by lean mass. Children with good performance in handgrip and standing long jump had better and worse bone health, respectively. These differences disappeared after controlling for lean mass. Children with high lean mass had higher values in all bone-related variables. In addition, the relationship between muscle fitness and bone mass was fully mediated by lean mass. In conclusion, the relationship between upper-limbs muscle fitness and bone health seems to be dependent on lean mass but not on muscle fitness. Schoolchildren with high lean mass have more BMC and BMD in all regions. Lean mass mediates the association between muscle fitness and bone mass.  相似文献   

9.
Abstract

The purpose of this study was to establish percentile norms and to compare skinfold and other anthropometric measurements of 647 Italian, Jewish, and Negro preadolescent boys from the Boston, Massachusetts area. Skinfolds were measured at five sites. Other measurements included height, weight, bi-iliac diameter, and selected girths.

Correlations were determined between skinfolds and selected body build components. Interskinfold r's ranged from moderate to high values. The largest percentile scores were found within the Jewish group. Analysis of variance was employed to compare the body fat, height, and weight of each group. Significant differences were found relative to certain skinfolds and weight between ethnic groups at the 1 percent level.  相似文献   

10.
BackgroundPuberty is a critical time in the development of overweight and obesity. The aim of this study was to examine relationships between measures of adiposity, cardiovascular fitness, and biomarkers of cardiovascular disease risk in adolescents.MethodsIn a cross-sectional study design, 129 girls and 95 boys aged 12.9–14.4 years at various stages of puberty were included, along with their mothers (n = 217) and fathers (n = 207). Anthropometric assessments of adiposity were made, along with cardiovascular physical fitness, using the 20-m shuttle run test, and biomarkers associated with cardiovascular risk, including glucose, insulin, triglyceride, fibrinogen, and C-reactive protein (CRP) concentrations.ResultsWaist-to-height ratio values were similar in boys and girls and correlated positively with diastolic blood pressure, insulin, triglyceride, fibrinogen, and CRP concentrations, and inversely with cardiovascular fitness scores. Skinfold thickness measurements were higher in girls. High-molecular-weight adiponectin concentrations were lower in boys than girls, particularly in late puberty, and CRP levels were higher. Cardiovascular fitness, maternal body mass index (BMI), and paternal BMI contributed independently to the variance in waist measurements in girls and boys. Gender, triceps skinfold thickness, and weight-to-height ratio, but not parental BMI, contributed independently to the variance in cardiovascular fitness.ConclusionThere is a relationship between measures of adolescent adiposity and parental weight that involves factors other than cardiovascular fitness. Adolescent boys have relatively more abdominal fat than girls and a tendency to have a proinflammatory profile of biomarkers. These observations suggest that family and social environmental interventions are best undertaken earlier in childhood, particularly among boys.  相似文献   

11.
Abstract

This study examined associations between four health-related physical fitness measures and obesity in Taiwanese youth aged 10–18 years. Data from 13,500 school-aged youth were randomly selected from the “School Physical Fitness Database” of Taiwan by sex and age. Variables examined were height, body mass and performance on modified sit-and-reach (flexibility), bent-leg sit-up (abdominal muscular strength/endurance), standing long jump (lower body explosive strength) and distance run/walk (cardiorespiratory endurance). Adjusted logistic regression analyses were performed. Increased odds of being obese with decreased fitness levels were observed for lower body explosive strength and cardiorespiratory endurance in both sexes. The highest odds of being obese was found in the least fit quintile of cardiorespiratory endurance compared with the most fit quintile both in boys (Odds ratio, OR = 10.44; 95% confidence interval (CI), 7.94–13.73) and girls (OR = 5.40; 95% CI, 3.90–7.47). These findings suggest that in addition to cardiorespiratory fitness, lower body explosive strength is also associated with childhood and adolescent obesity.  相似文献   

12.
The purpose of this study was to determine the association of somatotype, body composition, and physical performance in 7- through 12-year-old boys. Two objective methods of measuring somatotype, Sheldon's trunk index method and Heath–Carter's anthropometric method, were used. Body composition was estimated as fat and lean body mass from 40K measurement, using a whole-body counter, and from two skinfold thickness measures. Physical performance measures consisted of three tests of running (mile run, 600-yd run and 50-yd dash) and two tests of jumping (standing broad jump and vertical jump). In general, somatotype components had lower correlations with running and jumping variables than did body composition or body size variables such as height, weight, and percent fat. Heath and Carter's third component, derived from the inverse ponderal index, correlated more closely with performance scores than did other components of somatotype. Somatotype components in combination with each other and with body size and body composition variables in a multiple regression analysis indicated little association with running performance, but some association with jumping. Mesomorphy and second component were the least significant somatotype components, as indicated by the standardized regression coefficients.  相似文献   

13.
Abstract

In this review, we examine the original obesity paradox phenomenon (i.e. in cardiovascular disease populations, obese patients survive better), as well as three other related paradoxes (pre-obesity, “fat but fit” theory, and “healthy” obesity). An obesity paradox has been reported in a range of cardiovascular and non-cardiovascular conditions. Pre-obesity (defined as a body mass index of 25.0–29.9 kg · m?2) presents another paradox. Whereas “overweight” implies increased risk, it is in fact associated with decreased mortality risk compared with normal weight. Another paradox concerns the observation than when fitness is taken into account, the mortality risk associated with obesity is offset. The final paradox under consideration is the presence of a sizeable subset of obese individuals who are otherwise healthy. Consequently, a large segment of the overweight and obese population is not at increased risk for premature death. It appears therefore that low cardiorespiratory fitness and inactivity are a greater health threat than obesity, suggesting that more emphasis should be placed on increasing leisure time physical activity and cardiorespiratory fitness as the main strategy for reducing mortality risk in the broad population of overweight and obese adults.  相似文献   

14.
目的:基于决策树模型探讨幼儿体质的影响因素及其交互关系。方法:募集学龄前儿童4621名(36~83月龄)。参照《国民体质测定标准手册(幼儿部分)》进行体质测试与综合评级(合格、不合格);问卷调查幼儿出生信息、育儿方式、静坐与身体活动、膳食营养、睡眠、父母情况6个一级指标下分的59个二级指标变量信息;采用IBM SPSS modeler创建CHAID决策树模型。结果:幼儿体质的重要影响因素排序依次为周末身体活动(PA)、周末静坐行为(SB)、性别、周末中-大强度身体活动(MVPA)、上学日PA、钙、上学日SB。决策树模型显示,根节点变量周末PA“>3 h/天”(95.35%)的幼儿体质合格率与“1~3 h/天”(91.43%)、“≤0.5 h/天”(85.43%)相比具有非常显著性差异(P=0.000)。周末PA“>3 h/天”的第2、3层叶节点变量分别为周末SB、上学日PA,“1~3 h/天”“≤0.5 h/天”的第2层叶节点变量均为性别。其中,“1~3 h/天”的3~5层叶节点变量包括周末与上学日MVPA、上学日SB、钙等。结论:周末PA是影响幼儿体质的最关键因素。幼儿周末PA应超过3 h/天的国际推荐量标准,并在此基础上减少周末SB时间、增加上学日PA时间。身体活动与静坐行为、性别、钙摄入等对不同层次类型幼儿的体质促进具有决策意义。  相似文献   

15.
This study aimed to analyse the association of different components of physical fitness, body composition, cardiometabolic markers and the Mediterranean diet with bone mineral density (BMD) in perimenopausal women, and to test which of these components are independently associated with BMD. The sample comprised 197 perimenopausal women (52.6 ± 4.5 years). Physical fitness was assessed with the “Senior Fitness Test” battery and the handgrip strength and Bruce tests. Fat and lean mass and BMD were measured using dual-energy X-ray absorptiometry. We analysed the markers of metabolic syndrome, C-reactive protein, and components of the Mediterranean diet. Handgrip muscle strength (β = 0.212, P = 0.005), body weight (β = 0.244, P = 0.001), BMI (β = 0.180, P = 0.011) and lean mass (β = 0.379, P < 0.001) were positively associated with BMD. No associations were observed between cardiometabolic markers or the Mediterranean diet with BMD (all P > 0.05). When all relevant indicators of BMD were simultaneously considered, lean mass was the only 1 showing an independent association with BMD (β = 0.392, P < 0.001), explaining 14% of the BMD variability. In conclusion, muscle strength might be a marker of BMD in perimenopausal women. However, lean mass was the only factor independently associated with BMD. Future research to determine whether increasing lean mass through specific exercise-based interventions contributes to increasing BMD is warranted.  相似文献   

16.
Abstract

Longitudinal studies provide unique opportunities but are also faced with several limitations. The purpose of this study was to document three of these issues (“imperfect” design, evolution of data collection methods, representativeness) by means of the Leuven Longitudinal Study on Lifestyle, Fitness and Health (LLSLFH). The LLSLFH (1969 – 2004) comprises observations on males between 12 and 18 years and at 30, 35, 40, and 47 years, and on females at 16 and 40 years. In the most recent phase of the study, spouses and offspring were also included. The different phases and evolving research questions throughout the LLSLFH required an appropriate adaptation of the research design. The associated evolution of data collection methods largely reflects the changing ideas about physical fitness, body composition, and physical activity, the continuing search for new and better measurement techniques, and the need for adaptations with age. Ongoing study participants are representative in terms of body composition and, except for adolescence in males, also physical activity. No straightforward answer can be given concerning physical fitness. In both sexes, socio-economic status is above average. When informed about the possible “pitfalls” of longitudinal research in advance, several measures could be taken to prevent or limit them as much as possible.  相似文献   

17.
Abstract

We investigated cardiovascular fitness and haemodynamic responses to maximal cycle ergometer exercise test in children. The participants were a population sample of 425 children (204 girls, 221 boys) aged 6–8 years. Heart rate (HR) and systolic blood pressure (SBP) were measured from the beginning of pre-exercise rest to the end of recovery period. We provided reference values for peak workload and changes in HR and SBP during and after maximal exercise test in girls and boys. Girls had a lower cardiovascular fitness, indicated by peak workload per body weight [mean (2 s) 2.7 (0.9) vs. 3.1 (1.0) W · kg–1, P < 0.001] and lean mass [mean (2 s) 3.5 (0.9) vs. 3.8 (1.0) W· kg–1, P < 0.001] than boys. Plateau or decline in SBP close to the end of the test was found in about third of children and was considered a normal SBP response. Girls had a slower HR decrease within 2 min after the test than boys [mean (2 s) 53 (18) vs. 59 (22) beats · min–1, P < 0.001]. The results are useful for physicians and exercise physiologists to evaluate cardiovascular fitness and haemodynamic responses to exercise in children and to detect children with low exercise tolerance or abnormal haemodynamic responses to exercise.  相似文献   

18.
Purpose: There is currently no standardized testing protocol for assessing clients’ fitness/health within the Australian fitness industry. This study examined the perceptions of the feasibility of using a standardized testing protocol among Australian fitness industry professionals. Method: In 2014, 1,206 registered fitness industry professionals (aged 17–69 years) completed an online survey. Perceived feasibility for using a standardized testing protocol was assessed based on responses to 6 items. Respondents were classified as having a high level of perceived feasibility if they reported all 6 items to be “definitely feasible.” A multivariate logistic regression analysis, adjusting for demographic and fitness industry-related factors (e.g., qualification/years of experience), assessed the likelihood of having a high level of perceived feasibility. Results: Overall, 25.5% (95% CI [23.1%, 28.0%]) of the sample perceived the use of a standardized testing protocol as highly feasible. Items ranked most often as “definitely feasible” were “undertaking training to use the protocol” (55%) and “conducting follow-up testing every 6 to 12 weeks” (52%). After adjustment for the effect of confounding factors, casually employed professionals (OR = 0.63; 95% CI [0.45, 0.90]) and group instructors (OR = 0.58; 95% CI [0.41, 0.82]) were less likely to perceive standardized testing protocols as highly feasible. Conclusions: Among a large sample of Australian fitness industry professionals, slightly more than a quarter perceived using a standardized testing protocol to be highly feasible. Group instructors and casual employees perceived lower feasibility. Further research should determine the barriers to implementing a standardized testing protocol across the fitness industry.  相似文献   

19.
Abstract

This study was conducted (a) to determine through factor analysis techniques the basic factors underlying selected blood variables, metabolic variables, and previously determined physical and athletic fitness variables at four fixed stages of metabolic stress and (b) to determine with the t-test and through discriminant function techniques those blood variables which can discriminate between high and low levels of physical fitness. The objective of the analyses was the interpretation of the revealed information in light of previously found knowledge on the relationship of physical activity and susceptibility to heart disease. Four factors were extracted and interpreted: the effect of weight on motor fitness, the detrimental effect of aging on physical fitness, metabolic readiness, and fitness and NEFA mobility. The t-test showed statistical significance for the difference between the physically fit and unfit group means in resting serum cholesterol, submaximal exercise serum cholesterol, maximal exercise blood pH, and recovery period blood pH. The discriminant function of the combined resting and submaximal exercise serum cholesterol has a statistically determined discriminating power for the physically fit and unfit groups.  相似文献   

20.
ABSTRACT

Cross-sectional study aimed to analyse differences in cognitive performance across fitness components categories (cardiorespiratory fitness [CRF], speed-agility and muscular fitness [MF]) and weight status in children, and to determine whether physical fitness mediates the association between body mass index (BMI) and cognitive performance. Fitness components and BMI were measured using standard procedures in 630 children aged 5-to-7 years from the provinces of Cuenca and Ciudad Real, Spain. BADyG was used to assess cognitive performance. We used ANCOVA models to test mean differences in cognition scores by BMI and fitness categories. Hayes’s PROCESS macro was used for mediation analyses. Children with normal weight scored better in spatial factor and general intelligence than their overweight/obese peers (p < 0.05), but differences were attenuated when controlling for CRF (p > 0.05). Children with better results in CRF and speed-agility scored better in all cognitive dimensions even after controlling for BMI (p < 0.05). Similarly, children with high MF obtained better scores in verbal factor (p < 0.05). All fitness components acted as mediators of the relationship between BMI and general intelligence (p < 0.05). These findings highlight the crucial role of fitness in minimising the negative effect of excess weight on children’s cognition.

Abbreviations: BMI: Body mass index; CRF: Cardiorespiratory fitness; MF: Muscular fitness; BADyG E1: Battery of general and differential aptitudes; SES: Socioeconomic status; SD: Standard deviation; IE: Indirect effect  相似文献   

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