Suppressing some log information

In the Grinder .log files (not the -data.log files), there are lines like:

2014-01-16 17:47:34,851 INFO  com-0 thread-7 [ run-0 ]: sleeping for 2526 ms
2014-01-16 17:47:37,768 INFO  com-0 thread-0 [ run-0, test-10000 ]:
https://<url> -> 200 OK, 684 bytes

For long duration runs, these log files get very large due to these lines
appearing quite often. However, the information at the top (Grinder version,
JDK version, etc...) and the information at the very bottom (timings) are
useful. 

Is there any way to suppress the information in the middle (specifically the
lines above)? In my tests, after 4 hours, each file is about 50mb and I run
with 10 processes, so every 4 hours I get 500mb of logs, most of which I
don't need and don't have room for.




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