Just had a quick question regarding whether or not I should be using a one or two way ANOVA to see the effect of caffeine on heart rate. My groups are: control, coffee, energy drink. My sample size is 50 for each group and for each individual I tested at the following times: initial, 30 mins., 60 min., 90 min., 120 min. after consumption.

My goal is to see if the experimental groups have a significant effect on HR but I'm unsure how to go about setting this up in Excel. Any ideas would be greatly appreciated.