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probably has to do with the fact that you are gaining weight overall when doing lower reps... ie, increasing your bodyfat%. Unless you are doing cardio on the side, you aren't getting your HR up for any extended period of time with strength phases.
i never really go for reps and always maintain the same weight.. but even when i train 5-6 rep max, I can still do roughly the same amount of reps with body weight exercises...
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