Between‐group Differences in the Patterning of Musculo‐skeletal Stress Markers: Avoiding Confounding Factors by Focusing on Qualitative Aspects of Physical Activity

This paper presents a method for studying between‐group differences in physical activity patterns through the analysis of musculo‐skeletal stress markers (MSM). The specific aim was to develop a method that could overcome the problems related to confounding variables such as body size by shifting the analytical focus from the comparison of differences in intensity to the comparison of differences in kinds of activity. Instead of testing whether there are differences in the measures of central tendency of MSM scores between two groups, we proposed looking for differences in MSM covariation patterns. Formally, this is achieved through the statistical comparison of group‐specific MSM intercorrelation matrices. The null hypothesis is that the matrices are equal, and the statistical significance of the test statistic is obtained with a permutation test. In this way, the problem of confounding variables such as body size is mostly avoided because the procedure is based on the comparison of group‐specific sets of correlation coefficients which are scale‐free. The method was employed in a case study to investigate the differences in activity patterns between men and women from the Early Bronze Age population buried at the necropolis in Mokrin, Serbia. The null hypothesis of no difference between the male and female MSM correlation matrices was rejected (p = 0.0135). After the statistical significance of the difference was established, further investigation of male and female activity patterns was undertaken by means of principal component analysis (PCA) with varimax rotation. PCA results suggest that covariation between MSMs is stronger in the male sample. Success in demonstrating differences in activity patterns between sexes implies that the proposed method can be used to test for differences in physical activity between groups of individuals defined by criteria other than sex. Copyright © 2011 John Wiley & Sons, Ltd.     

Further aspects of fur trade life depicted in the skeleton

Osteobiographies were reconstructed from the skeletal remains of four adults from Fort Edmonton, a 19th century trading post of the Canadian fur trade. Three males were Caucasoid and probably ethnic Scots, given the usual origin of fur traders in this region. The lone adult female in the sample was Mongoloid, either Indian or Métis, and likely the ‘country wife’ of a fur trader, since she was buried in the European tradition in the fort cemetery. The cause of death is not discernible from any of the skeletal remains and none of these individuals exhibit any evidence of chronic infectious disease, malnutrition or neoplasia. Trauma, arthritis and other indicators of physical stress do appear, however, and present an opportunity to expand our understanding of the effects of fur trade life on the skeleton. Viewed in the context of historical accounts of life at the fort in the early 19th century, stress markers on the skeletons of three males have led to the conclusion that they were voyageurs who engaged in trading trips by canoe or boat. Lesions of the capsule attachment area at the proximal tibio‐fibular articulation appear unilaterally in two males and may be associated with ‘mushing’ or driving a dog sled in winter. The musculoskeletal lesions on the one preserved female skeleton are consistent with the arduous domestic activities documented at the fort, which include milking cows, churning butter, stirring lye soap, and harvesting grain and root vegetables by hand. Since specific occupations or behaviours cannot be precisely determined from muscular attachment and other stress markers, these interpretations are made cautiously and only in the culture‐historical context of the skeletal sample. Copyright © 1999 John Wiley & Sons, Ltd.     

New regression equations for stature estimation for medieval Scandinavians

Estimating stature from skeletal remains in an archaeological context requires appropriate methods that take into account possible temporal and spatial changes in body proportions. New regression equations—both least squares (LSQ) and reduced major axis (RMA) equations—were thus developed for estimating living stature from the long bone lengths of medieval inhabitants (N = 60) of Westerhus, Sweden. The living stature of these skeletal specimens was determined by using the anatomical method. Findings in this study reveal that LSQ regression equations systematically overestimate statures of short individuals and underestimate those of tall individuals, whereas the RMA equations—both combined sexes and sex‐specific equation—provide more accurate stature estimations for individuals of very different statures. The combined sexes RMA‐equations should be used for cases in which the sex is unknown because they provide more accurate stature estimations than sex‐specific equation with a wrong sex determination. These new equations are more appropriate than generally used regression equations for estimating statures of the medieval period Scandinavians. Copyright © 2009 John Wiley & Sons, Ltd.     

以家庭为单位的活动参与：联合与独立家庭维持性活动中的性别差异—— 以北京市家庭为例

个体的日常活动发生在复杂的情境下,受到来自地理环境和社会环境的制约。以往研究揭示了制约下的个体在活动参与上展示出明显的性别差异。然而,传统以个体为单位的研究,忽视了家作为地方秩序的口袋,其内部分成员之间的互动对不同性别家庭成员活动参与的影响。本文从家庭内部分工的视角,研究夫妻双方在参与家庭维持性活动的时间利用的差异。在分析差异形成的过程中,在家庭区位特征、个体社会经济特征外,关注了配偶的社会经济特征、家庭成员间的互动对个体参与独立与联合家庭维持性活动的影响。研究结果验证了我们的假设,微观个体活动参与及时间利用的性别差异,不仅受到社会与地理环境制约,而且是家庭成员之间互动、分工的结果。以家庭为单位的分析能更好地补充和解释以往性别差异的研究成果,为个体活动、移动行为等研究提供新的视角。     

What do muscle marker ruggedness scores actually tell us?

Musculoskeletal stress markers (MSM) have been used to reconstruct activity patterns and labour intensity of past populations. Age and size have been found to correlate with MSM, and these aspects should be considered in activity reconstructions. The aim of this study was to find out the nature and the effects of labour intensity, age and size on MSM. Study material were skeletons (N = 108) of individuals of known age, sex and occupation housed at the Natural History Museum, Finland. MSM were scored for Pectoralis major, Deltoid, Teres major and Biceps brachii. These scores were combined to reflect total activity of an individual. Geometric mean of humeral measurements was used as a size indicator and radial tuberosity size was used as a muscle size indicator. Factors explaining MSM were studied using ANCOVA. This included age, size, muscle size, sex, labour intensity, and their interactions. Age and muscle size were the most significant factors explaining MSM, where muscle attachment areas and MSM grow with advancing age. Muscle attachment areas and skeletal frame size were also found to correlate. Least squares regression parameter estimates were used to study the effects of labour intensity, sex and side on MSM. It was found that in early life scores are higher in heavy labour group, but there is less age‐related increase in these scores. This could mean that bone is unable to respond to heavy and continuous loading with surface structure. Therefore labour intensity cannot be reliably recorded in old individuals. Also age and size (as reflected in muscle attachment area) affect MSM and these aspects should be considered before making assumptions on labour intensity. Copyright © 2009 John Wiley & Sons, Ltd.     

Physical activity and social status in Early Bronze Age society: The Mokrin necropolis

This paper investigates the social structure of an Early Bronze Age society whose members were buried at the necropolis of Mokrin (Serbia, Southeastern Europe), by comparative analysis of musculo-skeletal markers (MSM) of activity and social status as induced on the basis of grave contents. The main objective of the analysis is to determine whether quantitative and qualitative differences in activity are related to social status. Besides using an overall measure of activity, we attempted to isolate different qualitative aspects (facets) of activity through factor analysis of MSM scores. No correlation between social status and overall labor intensity was found. However, there are clues that social status and a single facet of activity are related. Positive correlation between vertical status and the intensity of use of upper arm and shoulder muscles was found among male individuals, while negative correlation between the aforementioned variables was found among the females. The general conclusion based on the results of this study is that there is no simple correlation between the overall labor intensity and social status.     

Schmorl's nodes in a post‐medieval skeletal sample from Klostermarienberg,Austria

The prevalence and distribution pattern of Schmorl's nodes (SNs) were studied in a post‐medieval skeletal sample (n = 473) from the 16^th–18^th century cemetery of Klostermarienberg, Austria. The reasons for the prevalence and distribution pattern of SNs in this sample are discussed with regard to their aetiology. SNs were correlated with age and sex as well as with degenerative spinal joint disease such as vertebral osteophytosis (VO) and apophyseal osteoarthritis (OA). SNs were most commonly found in the lower thoracic region, in agreement with other studies. Males were more affected than females by SNs, especially in the lower thoracic region. SNs show a completely different distribution pattern to VO and OA. Additionally, there was no relationship found between SNs and ageing. Observed differences in the prevalence of SNs in the vertebral column and between the sexes suggest that mechanical factors may be responsible. Copyright © 2008 John Wiley & Sons, Ltd.     

The relationship between school ground design and intensity of physical activity

In this study, we investigated the relationship between school ground design and children's physical activity levels. In particular, we were interested in understanding the contribution of ‘green’ school ground design to physical activity levels. Data for this study were collected at an elementary school in Australia and in Canada. At each school, scans of Target Areas were completed to record the students' location and intensity of physical activity, based on the System for Observing Play and Leisure Activity in Youth (SOPLAY) (Australia: 23 scans, 6 Target Areas; Canada: 18 scans, 7 Target Areas). At both schools, the highest percentage of children present was engaged in vigorous physical activity on the manufactured equipment (42% of children/scan). Similarly, at both schools, the green area encouraged the highest percentage of children present to be engaged in moderate physical activity (47% of Australian children/scan, 51% of Canadian children/scan). The patterns of sedentary behavior differed slightly between countries. At the Australian school, the paved sporting courts (57%) and the paved canteen courtyard (50.5%) promoted the highest degree of sedentary play. At the Canadian school, the treed grassy berm (42%) and the treed concrete steps (43%) encouraged the highest percentage of sedentary behavior, followed by the open asphalt (34%). These results are also discussed in light of gender distribution. We conclude with a discussion of the design and cultural factors that influence children's physical activity on school grounds. We argue that if school grounds are to realize their potential to promote physical activity, they should include a greater diversity of design features and ‘green’ elements that engage children of varying interests and abilities in active play.     

Introducing urban vitality as a determinant of children's healthy mobility habits: a focus on activity engagement and physical activity

In this study we introduce urban vitality as a determining factor for both physical activity (PA) and activity engagement in children living in Barcelona's Metropolitan Region. We compare the physical outcomes of children living in vital and non-vital areas using mobility data taken from a travel survey. Chi-square, and association tests were used to compare the health outcomes of children living in vital and non-vital areas. Specifically, we measured for activity engagement, walking for transport, minutes of PA and adequacy to World Health Organization PA recommendations. Results are stratified by age and gender and reveal how living in a vital area can produce up to 54 minutes more of PA per week, with a difference of nearly 20% in the number of outdoor activities undertaken. Neighbourhood vitality promotes healthier mobility habits, as children living in buzzing areas tend to engage in more activities and spend more minutes walking for transport.     

The Effect of Terrain on Entheseal Changes in the Lower Limbs

One of the main factors involved in entheseal changes (EC) aetiology may be related to the physiological limits of biomechanical loading fixed during bone development, such that higher load during childhood and the adolescent growth spurt leads to a lower frequency of EC during adulthood. In this sense, it is possible that ECs may be related to overloading beyond an individual's normal physiological limits as established during childhood and adolescence. This meta‐analysis tested this aetiological possibility by studying the influence of terrain on the entheses of the lower extremities. The hypothesis is that individuals who inhabited rugged terrain have lower EC than those living in flat terrain. This is because biomechanical loads associated with rugged terrain will lead to a higher normal capacity (defined during skeletal development) mitigating the probability of overloading compared to those living in flat terrain who will therefore have a higher frequency of ECs. To test this, papers reporting EC frequencies in the lower limbs were analysed alongside the local terrain. Terrain was defined into two categories: flat or rugged based on altimetry profile, i.e. the average elevation gains and losses along four specific paths (North‐South, East‐West, Northwest‐Southeast, Southwest‐Northeast). Odds ratios were calculated to compare rugged and flat terrain. The overall results are consistent with the hypothesis that overloading is a factor in EC aetiology. However, when the analysis is conducted by sex and side, this general trend does not always occur. Limitations such as the lack of standardized age ranges could be affecting the outcome, i.e. older individuals have a higher frequency of ECs. The findings of this analysis suggest that the theoretical assumptions associated with the cause of ECs require further testing and evaluation. Copyright © 2017 John Wiley & Sons, Ltd.     

城市建成环境如何影响老年人体力活动——模型构建与大连实证

针对建成环境与老年人体力活动关系研究中,较少定量刻画其与社会、心理要素交互作用的不足,本文构建了三者交互影响下的体力活动关系模型。研究发现：①老年人体力活动参与率整体不高,性别与家庭结构差异在活动表现形式上存在不同。②活动意向未能有效触发老年人体力活动,自我效能感是其重要参考因素;建成环境、社会资本对老年人体力活动的影响,由直接或间接通过自我效能感中介完成,心理健康作用则未显现。③家庭结构存在调节作用,建成环境单一要素对空巢老人体力活动的作用并不明显,但其对与子女共同居住老年人影响稳健。④社会资本是建成环境发挥空间干预老年人体力活动作用的重要前提;环境对公共健康的影响,更应采应取组合式干预策略。     

Linking Bone Changes in the Distal Femur to Functional Deficits

Knee osteoarthritis (OA) is a condition that leads to functional deficits in the afflicted. Quantifying these deficits in a clinical population and relating them to bone changes in the distal femur is crucial to identifying potential impairment in archaeological populations. This study provides a hybrid knee OA grading system linking MRI observations of clinical populations and direct bone observations on skeletal populations. This system is then related to 28 pain, disability, and activity limitation outcome variables provided by the OA Initiative through frequency distributions, probability profiles, and Spearman's rank correlations. The results suggest that while the five outcome variables with the highest probabilities were common to males and females, bone changes in knee OA impact males and females differently. Copyright © 2012 John Wiley & Sons, Ltd.     

The demographic,socio‐economic and temporal contextualisation of the Universitat Autònoma de Barcelona collection of identified human skeletons (UAB collection)

Identified human skeletal collections are those in which basic demographic data (sex, age and biological origin) are known and are crucial for developing and testing osteological methodologies. It is important that the identified collection be contextualised, and in this way the collection will be considered a reference collection. To contextualise a collection requires documentation of the basic demographic data of the individuals (sex, age, year of birth, geographical area) as well as information concerning the socio‐economic and temporal context in which the individuals lived. The contextualisation of an identified collection is very important so the researchers can understand the ‘point of reference’ when applying a method to it or developing a new method. The purpose of this study is to contextualise the identified skeletal collection of the Universitat Autónoma de Barcelona (UAB) which currently contains 35 adult skeletons of both sexes. To carry out the objectives of the present study, the information about the individuals was collected from cemetery registers and compared with the information of the demographic and statistic public institutions of Spain. The results indicate that the UAB collection is formed only by Spanish nationals who mainly lived during the 20th century in Granollers (Barcelona, Spain). Both sexes are equally represented and all of the individuals are adults. They reflect the most current adult population structure of Catalonia and be treated as a Catalan reference sample of adults living in the 20th century. This collection offers special opportunities for demographic analysis, including validation studies of skeletal ageing and sexing methods that target adult individuals. The collection can also be used in conjunction with other reference samples to investigate secular and populational change in cranial form, sexual dimorphism and stature. Copyright © 2010 John Wiley & Sons, Ltd.     

The Occurrence and Possible Aetiology of Spondylolysis in a Pre‐contact California Population

The occurrence of spondylolysis (neural arch separation at the pars interarticularis) is reported in a pre‐contact (720–550 Cal BP) Central California population, CA‐CCo‐647 (n = 46). Spondylolysis was examined within this population to assess differences in sex, age, and possible relationships with biological affinity. Furthermore, prevalence rates of spondylolysis were compared across various populations to discern the aetiology of the defect. Within CA‐CCo‐647, spondylolysis was found in 17.4% (8/46) of the population. All occurrences are complete, bilateral separations of the neural arch in the lower lumbar (L4 and L5). The defect is not seen in individuals below the age of 18, and there is no correlation between adult age and spondylolysis. Male individuals display the defect at a higher rate (30.8% ‐ 4/13) than female individuals (12.1% ‐ 4/33); however, this is not a statistically significant finding. There does seem to be a correlation between an individual's sex and the onset of the defect; male individuals display spondylolysis at a younger age than female individuals. This finding could represent differences in activity patterns among young male and female individuals. In a biological distance analysis using craniometric data, male and female individuals with spondylolysis clustered closely, suggesting a genetic component for the defect. Finally, significant differences were found in spondylolysis prevalence between various populations representing distinct geographic and temporal settings. Significant differences were found among Native pre‐contact samples and even between two comparable pre‐contact California skeletal samples. These populations all engaged in distinct activities and were likely composed of genetically distinct groups of individuals, which may account for the differences in spondylolysis prevalence. All of these findings, both within CA‐CCo‐647 and between the various samples, suggest that the aetiology of spondylolysis is likely an interaction of genes and activity. Copyright © 2012 John Wiley & Sons, Ltd.     

Physical activity and rural young people's sense of place

This paper explores rural young people's perceptions of their local environments in relation to their experiences with physical activities through the use of visual methodologies. The main findings from map, photo and interview data from 13 rural young Australians included the importance of friends, family, and gender structures which are discussed in relation to developing a sense of place and how this shapes their experience in physical activities. The findings highlight the importance of sociocultural issues and raises questions regarding measuring physical activity prompting further qualitative research to inform sustainable and equitable physical activity promotion initiatives for rural young people.     

城市老年人户外体力活动时空特征的社区分异——基于GIS、GPS、加速度计的实证研究

城市老年人的户外体力活动的时空特征直接反映了其对城市体育空间的利用情况及闲暇时间的体力活动情况。本文基于2017年南京市老年人GPS活动轨迹和GT3⁺调查的第一手数据，运用MATLAB时空密度趋势面的可视化技术和GIS测度空间面积分析并比较南京市不同社区老年人户外体力活动的时空特征、活动空间形态与面积、体力活动量等，揭示不同社区老年人户外体力活动时空特征的社区分异，为政府相关部门了解城市老年人户外活动规律提供理论依据，为城市规划建设部门改善相应的社区建成环境、促进老年人积极的生活方式提供实践指导。     

Scars of Parturition? Influences Beyond Parity

In the 40 years since the phrase ‘scars of parturition’ was coined, studies have attempted to show the relationship between scars on the bony pelvis and parity history. Despite numerous studies, the relationship of parity and scarring remains unclear. The challenge facing these studies is the rarity of skeletal collections of known parity. The alternative study approach is examining relationships between scars and factors other than pregnancy‐related strains that may affect their manifestation. Skeletal remains of 312 individuals were examined for scarring at the dorsal pubic surface, pubic tubercle, preauricular sulcus, interosseous groove and iliac tuberosity. Pelvic and femoral measurements were also taken. Features were compared according to sex and age. Principal components analysis was performed to assess the influence of body and pelvic size on scar manifestation. Scars occurred in both sexes, although they were more common and more severe in females. Scar severity remained unchanged or increased with age in both sexes. Females had smaller bodies but larger pelves than males. The interspinous and transverse inlet diameters and the femur measurements increased with age. Principal components analysis showed that body and pelvic sizes represented the majority of the observed variation, with scars occurring more commonly in small‐bodied individuals with large pelves, most of which were females. Both sexes also show a difference in the magnitude of scarring at the pubis and ilium. These results suggest that weight‐bearing and pelvic stability may be a better explanation for scarring than parturition‐related strain. Female pelves are more flexible and require more ligamentous stabilization, causing increased scar formation. The weight‐bearing strain on male pelves may sometimes also be sufficiently large to cause similar scars. Future studies may be able to test this theory on samples of known parity history. Copyright © 2014 John Wiley & Sons, Ltd.     

广州市中产阶层日常活动的时空间特征

本文在对广州36个中产阶层聚居区881个中产阶层工作日与休息日活动日志问卷调查的基础上,运用时间地理学相关方法,探讨中产阶层日常活动的时间分配、空间分布和移动性特征。研究发现中产阶层工作日活动节奏清晰,休息日活动破碎化,工作日工作和休闲时间居多,休息日休闲和社交时间为主,不同属性的中产阶层工作日与休息日时间分配存在差异;此外,中产阶层"近家型"非工作空间特征明显,工作日与休息日活动空间分布集聚度最高的是核心商业区;以私家车和步行为主要的日常出行方式,"少次、多目的"的出行结构突出,日常活动空间移动能力较强。上述中产阶层的时空间特征与中低收入者存在明显不同。研究有助于揭示中产阶层的日常生活规律,为提高城市社会经济活力和完善城市精细化管理提供参考。     

Age Estimation by Tympanic Bone Development in Foetal and Infant Skeletons

This article analyses age‐related changes in the development of the temporal bone in a sample of foetal and infant skeletons to contribute to the estimation of age by means of this skeletal element in bioarchaeological and forensic contexts. The sample was selected from a contemporary documented skeletal collection and is constituted by the temporal bones of individuals of both sexes (n = 37) with ages from 23 weeks of gestation up to 11 postnatal months. Different states of fusion of the tympanic ring and development of the tympanic plate were scored separately, and intra‐observer consistency was evaluated. Both documented chronological age and skeletal estimated age were examined in relation to successive stages of fusion and development in the pre‐ and postnatal periods. It was found that the state of fusion of the tympanic ring is especially useful in the discrimination of foetal and postnatal individuals, whereas the development of the tympanic plate is helpful in the differentiation of individuals from and below 3 postnatal months. Even though a certain degree of overlap between successive stages was observed, the fusion of the tympanic ring and the development of the tympanic plate constitute good indicators of age in foetal and infant skeletons. Copyright © 2015 John Wiley & Sons, Ltd.     

Modeling skeletal traits and functions of the upper body: Comparing archaeological and anthropological material

The aim of this study is to look at upper body functional modifications caused by mechanical loading. We look at 4th lumbar vertebra as well as fibrous humeral musculoskeletal stress markers (MSMs). This study uses information provided by magnetic resonance images of living individuals from the University of Oulu Hospital data banks (N = 91), archaeological skeletons from Sweden (N = 54) and England (N = 61), and autopsied skeletal collection of early 20th century Finns in Natural History Museum, University of Helsinki (N = 48). The lumbar vertebrae and MSM are subjected to mechanical loading caused by the upper body weight and loads lifted and/or carried. We hypothesized that the vertebral size reflect body size, habitual mechanical loading and the overall skeletal robusticity as mechanical competence to withstand mechanical loading standardized to body size, which has decreased over millennia. For Helsinki material occupation, age and sex is known and the material was used in Niinimäki (2011). In the study by Niinimäki (2011) MSM were found to be affected by the intensity of muscular action as well as body size and age. This study is reviewed here in light of re-analysis of the data to follow the current anatomical understanding of the entheses as well as viewing MSMs as a part of upper body functional complex. Only fibrous entheses were included in the re-analysis. Furthermore, due to small number of females where activity intensity could be assessed, females were dropped from the re-analysis.