Final answer:
The fifth period witnessed substantial growth in sport psychology, particularly in theoretical development and applied research, which contributed to the application of this knowledge in professional services to improve athletic performance and mental wellness.
Step-by-step explanation:
In the fifth period, sport psychology experienced a tremendous growth in both theoretical development and applied research. This period marked an important time where not only were theories about the psychological aspects of sport performance being crafted and tested, but this work was also being applied in real-world settings. This dual advancement is critical because it bridges the gap between knowledge and practice, allowing for a holistic approach to understanding and enhancing sporting performance and mental well-being.
Applied research in sport psychology has been crucial in exploring various aspects such as motivation, performance anxiety, and the overall mental and emotional wellbeing of athletes. Through this research, sports psychologists have developed measures and interventions that could be applied to improve athletic performance. The growth in professional service follows as sports psychologists then apply these research findings in their work with athletes, coaches, and teams to improve performance and mental health.