[R-sig-ME] Help in selecting the correct mixed model for a randomized crossover study

[Ricardo Jorge Soares Martins]

Dear everyone, hope you all have a great year first of all

I am fairly new to R, but I'm going to have to use it for my first study, as my supervisor suggested me to use a mixed models analysis on my study.

I am going to conduct a randomized crossover study where participants( about 24) are divided into 2 groups due to logistical constraints. The study involves participants performing 4 different exercise modalities( 4 conditions) in a randomized order, there is a total of 8 sessions, 2 for each exercise modality.

The aim of my study is to examine the differences in the demands of the 4 modalities, analyzing and comparing 3 repeated measures( heart rate ,lactate and rate of perceived exertion) between the 4 exercise modalities. Also to note, there is the age range of the participants which is quite wide so there is some variability expected between participants.

Given this setup, I am unsure about the best way to structure and use mixed models in R in this context, specifically what is the correct mixed-effects model to use in this case and also any further insights or considerations you believe I should need I'll be more then happy to listen!

Thank you in advance for the help, best regards to all
Ricardo





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