What are some effective strategies for determining individual hydration needs on long rides, beyond the general drink to thirst approach? Is it possible to develop a personalized hydration plan based on factors such as sweat rate, climate, and individual physiological responses, and if so, how can riders accurately measure and incorporate these factors into their hydration routine? Additionally, are there any emerging trends or research in the field of sports nutrition that could inform new approaches to staying hydrated and energized on long rides?