In this paper two bootstrap procedures are considered for the estimati
on of the distribution of linear contrasts and of F-test statistics in
high dimensional linear models. An asymptotic approach will be chosen
where the dimension p of the model may increase for sample size n -->
infinity. The range of validity will be compared for the normal appro
ximation and for the bootstrap procedures. Furthermore, it will be arg
ued that the rates of convergence are different for the bootstrap proc
edures in this asymptotic framework. This is in contrast to the usual
asymptotic approach where p is fixed.