Using a "for" loop to go through a number within a variable

I would like to change this sphagetti code into two for loops so that the first loop would go through "Segment_1_biceps_time" to "Segment_6_biceps_time" and second loop to go through "Trial_1_biceps_time" to "Trial_3_biceps_time". So I am guessing i should do that by changing part of the name of a variable to i and j.

(i.e. Segment_i_biceps_time & Trial_j_biceps_time , if i=1:6 and j = 1:3). But I am not sure how exactly i should go about this...

%% Segmenting time 

Segment_1_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_1_time_start) & (Trial_1_biceps_time(:,1)< Segment_1_time_end),:);
Segment_2_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_2_time_start) & (Trial_1_biceps_time(:,1)< Segment_2_time_end),:);
Segment_3_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_3_time_start) & (Trial_1_biceps_time(:,1)< Segment_3_time_end),:);
Segment_4_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_4_time_start) & (Trial_1_biceps_time(:,1)< Segment_4_time_end),:);
Segment_5_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_5_time_start) & (Trial_1_biceps_time(:,1)< Segment_5_time_end),:);
Segment_6_biceps_time = Trial_1_biceps_time((Trial_1_biceps_time(:,1)> Segment_6_time_start) & (Trial_1_biceps_time(:,1)< Segment_6_time_end),:);

Segment_1_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_1_time_start) & (Trial_2_biceps_time(:,1)< Segment_1_time_end),:);
Segment_2_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_2_time_start) & (Trial_2_biceps_time(:,1)< Segment_2_time_end),:);
Segment_3_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_3_time_start) & (Trial_2_biceps_time(:,1)< Segment_3_time_end),:);
Segment_4_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_4_time_start) & (Trial_2_biceps_time(:,1)< Segment_4_time_end),:);
Segment_5_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_5_time_start) & (Trial_2_biceps_time(:,1)< Segment_5_time_end),:);
Segment_6_biceps_time = Trial_2_biceps_time((Trial_2_biceps_time(:,1)> Segment_6_time_start) & (Trial_2_biceps_time(:,1)< Segment_6_time_end),:);

Segment_1_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_1_time_start) & (Trial_3_biceps_time(:,1)< Segment_1_time_end),:);
Segment_2_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_2_time_start) & (Trial_3_biceps_time(:,1)< Segment_2_time_end),:);
Segment_3_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_3_time_start) & (Trial_3_biceps_time(:,1)< Segment_3_time_end),:);
Segment_4_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_4_time_start) & (Trial_3_biceps_time(:,1)< Segment_4_time_end),:);
Segment_5_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_5_time_start) & (Trial_3_biceps_time(:,1)< Segment_5_time_end),:);
Segment_6_biceps_time = Trial_3_biceps_time((Trial_3_biceps_time(:,1)> Segment_6_time_start) & (Trial_3_biceps_time(:,1)< Segment_6_time_end),:);

[Stephen23]

"But I am not sure how exactly i should go about this... "

Simple: redesign your code to use indexing.

Putting numbers into variable names is a sign that you are doing something wrong. And, as you are about to find out, it makes it impossible to efficiently and neatly process your data. Trying to access numbered variable names is one way that beginners force themselves into writing slow, complex, buggy code that is hard to debug. Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

In contrast indexing is simple, neat, easy to debug, and much much more efficient than what you are trying to do. You should use indexing.