Final answer:
According to the research, working long hours is likely to increase stress levels, and excessive stress can lead to decreased mental alertness and cognitive function.
Step-by-step explanation:
Cory works long hours and according to research presented in the textbook, working long hours is more likely to increase stress levels than to improve physical fitness, sleep quality, or academic performance. Research has shown that increased physical fitness is associated with reduced stress and regular exercise may protect against stress-related health problems. However, as stress levels increase beyond an optimal point, it becomes excessive and debilitating, leading to decreased performance and well-being. This is referred to as distress, which can make concentration difficult and negatively affect task performance. Moreover, sufficient sleep is vital for various cognitive benefits, but decreased mental alertness and cognitive function are consequences of sleep debt and sleep deprivation, indicating that working long hours without adequate rest can impair these functions.