Q: My job means that I look upwards all day. Would this action increase my blood pressure? I also use my arms above head height.
A: To my knowledge there are no studies showing that frequent upward gazing and having your arms above your head during your work will increase blood pressure. I would be more concerned about you getting a stiff neck. Anyone doing repetitive movements should make sure they take frequent breaks. This also applies to people who sit in front of a computer screen and type all day. Check out the Wikipedia discussion on repetitive strain injury.