Nicholas, this is just the process that needs to be used when you decide whether something works or not; It's refreshing to see a study done on 'trained' subjects, more often than not these studies are done using those in a non-trained state because it's much easier to standardise.
Also bear in mind that soreness is extremely subjective; someone who squats every day to maximum will have a different perception of soreness than someone who does fifteen minutes of machine weights twice a week.
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