We know that making gratitude and appreciation explicit in long-term relationships has significant positive effects on the partners, but here is an article about research that suggests that same is true in work relationships.
A study from the University of California San Diego’s Rady School of Management finds teammates who thanked each other before performing a high-stress task had a better cardiovascular response compared to teams who did not express gratitude. The enhanced cardiovascular response leads to increased concentration, more confidence, allowing individuals to give their peak performance.