Effects of different intensities of resistance training with equated volume load on muscle strength and hypertrophy

The present study investigated the effects of different intensities of resistance training (RT) on elbow flexion and leg press one-repetition maximum (1RM) and muscle cross-sectional area (CSA). Thirty men volunteered to participate in an RT programme, performed twice a week for 12 weeks. The study employed a within-subject design, in which one leg and arm trained at 20% 1RM (G20) and the contralateral limb was randomly assigned to one of the three conditions: 40% (G40); 60% (G60), and 80% 1RM (G80). The G20 started RT session with three sets to failure. After G20 training, the number of sets was adjusted for the other contralateral limb conditions with volume-matched. CSA and 1RM were assessed at pre, post-6 weeks, and post-12 weeks. There was time effect for CSA for the vastus lateralis (VL) (8.9%, 20.5%, 20.4%, and 19.5%) and elbow flexors (EF) (11.4%, 25.3%, 25.1%, and 25%) in G20, G40, G60, and G80, respectively (p?>?.05). G80 showed higher CSA than G20 for VL (19.5% vs. 8.9%) and EF (25% vs. 11.4%) at post-12 weeks (p?p?相似文献   

Framing evolution discussion intellectually

This study examines how a first‐year biology teacher facilitates a series of whole‐class discussions about evolution during the implementation of a problem‐based unit. A communicative theoretical perspective is adopted wherein evolution discussions are viewed as social events that the teacher can frame intellectually (i.e., present or organize as exchanges of an intellectual nature). Furthermore, we characterize teacher framing of evolution discussion in terms of five communicative components: focus, orientation, social structure, mood, and participatory nature. Our video‐based analyses revealed that the teacher paid little attention to the conceptual contents and history of evolutionary theory, framing evolution discussions as moderately playful and partially mandatory events focused mainly on student sharing of ideas (i.e., personal opinions) and polite communication of evolution. Within this framing, the teacher adopted the role of a neutral (though admittedly biased) facilitator with an intermediary expert status (less knowledgeable than evolutionary biologists) and who was legally required (though also inclined) to discuss evolution. The main significance of this study is that it provides new and useful insights into social phenomena such as respect, politeness, and humor in the context of evolution discussion as well as a robust theoretical framework for analyzing evolution discussion from a social perspective. © 2010 Wiley Periodicals, Inc., Inc. J Res Sci Teach 48: 257–280, 2011     

How and where is artificial intelligence in the public sector going? A literature review and research agenda

To obtain benefits in the provision of public services, managers of public organizations have considerably increased the adoption of artificial intelligence (AI) systems. However, research on AI is still scarce, and the advance of this technology in the public sector, as well as the applications and results of this strategy, need to be systematized. With this goal in mind, this paper examines research related to AI as applied to the public sector. A review of the literature covering articles available in five research databases was completed using the PRISMA protocol for literature reviews. The search process yielded 59 articles within the scope of the study out of a total of 1682 studies. Results show a growing trend of interest in AI in the public sector, with India and the US as the most active countries. General public service, economic affairs, and environmental protection are the functions of government with the most studies related to AI. The Artificial Neural Networks (ANN) technique is the most recurrent in the investigated studies and was pointed out as a technique that provides positive results in several areas of its application. A research framework for AI solutions for the public sector is presented, where it is demonstrated that policies and ethical implications of the use of AI permeate all layers of application of this technology and the solutions can generate value for functions of government. However, for this, a prior debate with society about the use of AI in the public sector is recommended.     

Exclusory and transformative dimensions of adult environmental education in two Brazilian protected areas

This study addresses the limitations and potential for the development of an adult environmental education program in two protected areas in Brazil. The investigation was based on critical communicative methodology and involved 25 people variously related to puma conservation and environmental education. We found that the staff of protected areas had difficulties interacting with the local community. The main cited obstacle was the lack of infrastructure and staff, but partnerships with scientists and other institutions might help to overcome this limitation. As we identified a great diversity of potential audience, a dialogical process would be necessary to collectively identify community demands and seek solutions. Moreover, an adult environmental education program must consider the characteristics of adulthood and should promote diverse types of activities. In conclusion, we suggest that dialogical learning and critical communicative methodology can contribute to the development of the adult environmental education.     

Student support for reproductive health education in middle schools: findings from Lebanon

Reproductive health education (RHE) programmes in schools are a well-recognised means of helping young people make informed decisions relating to their sexual health and well-being. Very little research however has investigated attitudes towards such programmes among students in the Arab world. A national HIV education curriculum was developed in Lebanon in 2005. However, in the context of competing priorities and mixed levels of social resistance, curriculum implementation to date is far from universal. This study aimed to determine the prevalence of support for school-based RHE and the main factors associated with such support among young people aged 11–16 years in Lebanon. A secondary analysis of data from the 2011 Global school-based Student Health Survey (GSHS) was conducted. Students who supported RHE (58.1%) were more likely to be of higher grade level (adjusted OR [Odds Ratio]?=?1.78, p-value = 0.005), to have ever drunk alcohol (adjusted OR = 1.52, p-value = 0.012), to prefer mixed classes for RHE (adjusted OR = 3.19, p-value < 0.0001), to say RHE should start before or at puberty (adjusted OR = 3.57, p-value < 0.0001), and to be exposed to more health education topics in school (adjusted OR = 1.2, p-value < 0.0001). Identifying such sub-groups in the student body should inform the equitable implementation of RHE in culturally diverse settings like Lebanon.     

Is ethical sensitivity in teaching culturally bound? Comparing Finnish and Iranian teachers’ ethical sensitivity

In this study, we investigated the culture-invariant and culture-dependent nature of teachers’ ethical sensitivity in two countries. Our case study involves teachers from Finland (n = 864) representing Western culture, and from Iran (n = 556) representing Eastern culture. Culturally bound elements of ethical sensitivity were studied with the Ethical Sensitivity Scale Questionnaire. The analyses revealed that ‘Caring by connecting to others’ is a central, culturally invariant dimension of ethical sensitivity in both cultures. In the dimensions of ethical sensitivity, the dimension of ‘Taking the perspective of others’ is particularly dependent on culture, given the differences in the cultural dimensions of power distance and the collectivity of the countries studied.     

Self-selected or imposed exercise? A different approach for affective comparisons

The aim of this study was to compare the psychological and physiological responses of self-selected and imposed sessions of equivalent intensities and durations and allowing to participants a free control of pace during the self-selected session. Seventeen participants completed three sessions on a cycle ergometer. Participant’s VO_2Peak and lactate threshold were measured during an incremental exercise test. During the second and third sessions, participants could view a virtual cyclist on a monitor. During the self-selected session, participants were allowed free control of the intensity and duration. To ensure that the imposed session replicated the self-selected session in intensity, participants were instructed to follow an additional virtual cyclist, which was displayed on a monitor using the CompuTrainer 3D software. Power output and physiological and psychological variables were recorded during the sessions. A two-way ANOVA showed no effect of condition for power output (P = 0.940), heart rate (HR) (P = 0.965), VO₂ (P = 0.898), blood lactate (P = 0.667), Feeling Scale (P = 0.877), Felt Arousal Scale (P = 0.924) and CR100 (P = 0.939). A paired t-test showed no significant difference in Physical Activity Enjoyment Scale scores between sessions (P = 0.054). In contrast to previous studies, the self-selected session did not provide better affective responses than the imposed session with same intensity and duration.