We have read with great interest the article by Colado and Brasil (2019) titled Concurrent and Construct Validation of a Scale for Rating Perceived Exertion in Aquatic Cycling for Young Men that was recently published in Journal of Sports Science and Medicine. We enjoyed very much the construct of validity for correlating RPE derived effort for Aquatic Cycling. Construct validity was established by correlating RPE derived from the Aquatic Cycling Scale (0-10) from the Borg (6-20) Scale. It treats about a topic of interest from several practical points of views (exercising subjects, therapists, researchers in physiology, water coaches etc.). Nevertheless, the paper needs some improvement in the use of technical terms to better understand the interpretation of correlating the Aquatic Cycling Scale (ACS) with oxygen uptake, pulmonary ventilation (VE), heart rate (HR), and blood lactate concentration (BL) responses to the maximal load-incremental test.
Firstly, it is necessary to clarify the sentence whether it is beats/minute or revolutions on per minute (rpm). The term beats/minute could be confused with the terms used to define the heart rates. It is recommended in a more technical context to use revolutions per minute (rpm). We do not understand the definition of the cadence/rpm that is presented in the paper. We believe that the beat represents one beat for the left leg and one beat for the right leg (one beat left, one beat right). This would make better sense, since it would represent at 100 beats an rpm at 50. In fact, in another paper published in EJSS by the same authors in 2013, the cadence is rightly reported and, as illustrated in Fig. 1 of that paper, ranges from 60 to 90 rpm.
In the current 2019 JSSM paper, in the section "Experimental protocol session", the authors mention that, as quoted, the subjects were advised to perform one complete pedaling cycle (i.e., 0-360[degrees]) in 1 beat, considering that the beat is a steady pulse that is repeated cyclically during one minute and this determine the pace of the movement (for example, 100, 115, 130, etc. beats or pulses per minute). The statement leads to confusion for the reader and erroneously suggests pedaling cadences (rpm) that vary from 100 to 190 rpm. World cyclists on dryland do not reach 190 rpm and typically maintain 100-110 rpm during outings. As well, is it an increment of 15 rpm or 15 beats per min? It is very confusing and unclear. In fact, only...