Loading multiple h5 files in a for loop

I am trying to load 20 h5 files into matlab using a for loop, but am running into problems. The h5 files have names with long strings of numbers, so here is my code so far:

for k = 130000:140000

Trial = sprintf('Vestibular\rawData\20190422-%d_Sway.h5', k);

if exist(Trial, 'file')

Trial_1 = functionread(Trial);

else

fprintf('File %s does not exist.\n', Trial);

end

end

From my understanding, this code should run through that "%d" in Trial for each value between 130,000 and 140,000, then apply the functionread (a separate code function; this works and isn't the problem) on the files with matching names according to the k values. However, I only get values for Trial (a 1x38 char vector). I am being thrown into the fire so to speak with MATLAB thus far, but some assistance or a hint would be extremely helpful since I will be processing lots of data soon using this kind of function.

Thanks,

B