Free radicals – an evolutionary perspective

This chapter provides an evolutionary perspective on free radical biology. We first explain the concept of life history trade-offs and discuss how the need to manage oxidative stress in an optimal way may be an important mechanism driving the outcome of many of these trade-offs. We examine the different solutions that organisms have evolved to combat the damaging consequences of oxidative stress. We then examine the ways in which balancing investment in such defenses against the consequences of sustaining damage has influenced life history traits such in the context of growth, foraging, diet and activity patterns, sexual signaling, reproduction, and defense against infection

Youth sport programs : an avenue to foster positive youth development

Concern about the growth in adolescent problem behaviours (e.g. delinquency, drug use) has led to increased interest in positive youth development, and a surge in funding for 'after school programs.' We evaluate the potential of youth sport programs to foster positive development, while decreasing the risk of problem behaviours. Literature on the positive and negative outcomes of youth sport is presented. We propose that youth sport programs actively work to assure positive outcomes through developmentally appropriate designs and supportive child-adult (parent/coach) relationships. We also highlight the importance of sport programs built on developmental assets (Benson, 1997) and appropriate setting features (National Research Council and Institute of Medicine, 2002) in bringing about the five 'C's of positive development (competence, confidence, character, connections, and compassion/caring: Lerner et al., 2000). An applied sport-programming model, which highlights the important roles of policy-makers, sport organizations, coaches and parents in fostering positive youth development is presented as a starting point for further applied and theoretical research