Non-linear resistance training reduces inflammatory biomarkers in persons living with HIV: A randomized controlled trial

The purpose of this study is to analyse the effect of 12 weeks of non-linear resistance training (NLRT) on anthropometry, muscle strength and inflammatory biomarkers in persons infected with human immunodeficiency virus (PIHIV). Thirty previously sedentary PIHIVs were randomized into the NLRT (n?=?15) and control (CON, n?=?15) groups. NLRT group were submitted to 12 weeks of training, whereas the CON group maintained their daily habits. At baseline and after 12 weeks, both groups underwent anthropometric evaluations and blood sampling for the analysis of inflammatory biomarkers. Analysis of covariance using preintervention values as covariate was performed to determine the effects of exercise on anthropometry, muscle strength, cytokines levels and T cells. Significance was set at p?p?p p?=?.009), blood levels of interleukin (IL)-1β (p?=?.029), IL-6 (p?=?.005), IL-8 (p?=?.010), and tumour necrosis factor (TNF)-α (p?=?.001) and an increase in muscle strength (p?p?=?.030) and CD4⁺ (p?=?.004) and CD8⁺ (p?相似文献   

“Anyone free to chat?” Using technological features to elicit quality support online

This study examines how support seekers can integrate verbal and nonverbal cues in social network sites (SNSs) to elicit quality support from others. Building from sensitive interaction systems theory and verbal person centeredness (VPC), participants (N?=?579) evaluated a SNS profile that contained manipulated levels of directness in status updates used to seek support and nonverbal emotional expression in profile pictures. To capture the transaction of support, participants provided supportive messages in public and private conditions that were coded for their level of VPC. Negative emotional cues in profile pictures increased VPC in private messages, whereas directness in status updates negatively predicted VPC in private messages. Participants produced messages with higher levels of VPC after they viewed profiles that incorporated more features to disclose distress effectively. Broadly, this study addresses whether the content people post on SNS profiles shapes the quality of the supportive messages they receive.     

US duration and local trial spacing affect autoshaped responding

The acquisition and maintenance of signal-directed pecking was examined in week-old Leg-Horn chicks responding to a keylight stimulus paired with heat. In contrast with previous studies using pigeons with food as the US, both speed of acquisition and asymptotic level of keypecking were a direct function of US duration. Experiment 2 examined responding using a within-subject design to isolate the effects of trial spacing on performance during the immediate trial from the effects on performance during a following trial of fixed length. These comparisons revealed a significant effect of intertriai interval (ITI), with less responding after shorter intervals. The effect of different temporal spacing was apparent in responding on the immediate trial, but not on the following trial. These local ITI effects were better predicted by a recent autoshaping model based on relative waiting time (Jenkins, Barnes, & Barrera, 1981) than by a model based on relative US expectancy (Gibbons & Balsam, 1981). However, neither model predicted the effect of US duration. A reexamination of the US-duration literature suggested that the diversity of previous findings is consistent with the assumption that conditioned responding is an inverted U-shaped function of US duration.     

Humanisation in Russian Education: a transition between state determinism and individualism

This article is concerned with the development of humanisation in contemporary Russian education where it is regarded as a key factor influencing social change in the country. The authors draw on the proceedings of a seminar held in Moscow in 1994 concerned with the future of Russian education. Through an analysis of past Russian educational development and related psychological theory an argument is developed which suggests that present trends owe more than may be expected to the past. The concept of mediation is a central concern of the authors. They argue that the present discussion in Russia is overly individualistic and takes no account of processes of mediation in pedagogic formulations which render them incomplete and vulnerable to exploitation.     

‘Info‐tainment’ and informal sources for learning science

The many sources from which members of the public can gain some science knowledge are but one manifestation of the current boom in the provision of entertainment and leisure activities with an information content. While there has been a large increase in the study of science learning from such informal sources, there has been little cross‐referencing between groups concerned with the presentation of science, those with social history, with art, and so on. Greater sharing of ideas, data and methodologies may be mutually beneficial.     

Causal Learning Across Culture and Socioeconomic Status

Extensive research has explored the ability of young children to learn about the causal structure of the world from patterns of evidence. These studies, however, have been conducted with middle-class samples from North America and Europe. In the present study, low-income Peruvian 4- and 5-year-olds and adults, low-income U.S. 4- and 5-year-olds in Head Start programs, and middle-class children from the United States participated in a causal learning task (N = 435). Consistent with previous studies, children learned both specific causal relations and more abstract causal principles across culture and socioeconomic status (SES). The Peruvian children and adults generally performed like middle-class U.S. children and adults, but the low-SES U.S. children showed some differences.