title: Inaccuracy of the HR reserve vs. V˙O2 reserve relationship during prone arm-paddling exercise in surfboard riders.
abstract: Previous studies have demonstrated that during lower-body exercise the percentage of heart rate reserve (%HRR) is equivalent to the percentage of the oxygen consumption reserve (%V˙O(2R)) but not to a percentage of the peak oxygen consumption (%V˙O(2peak)). The current study examined these relationships in trained surfboard riders (surfers) during upper-body exercise. Thirteen well-trained competitive surfers performed a stepwise, incremental, prone arm-paddling exercise test to exhaustion. For each subject, data obtained at the end of each stage (i.e., HR and V˙O(2) values) were expressed as a percentage of HRR, V˙O(2peak), and V˙O(2R) respectively and used to determine the individual %HRR-%V˙O(2peak) and %HRR-%V˙O(2R) relationships. Mean slope and intercept were calculated and compared with the line of identity (slope=1, intercept=0). The %HRR versus %V˙O(2R) regression mean slope (0.88±0.06) and intercept (20.82±4.57) were significantly different (p<0.05) from 1 and 0, respectively. Similarly, the regression of %HRR versus %V˙O(2peak) resulted in a line that differed in the slope (p<0.05) but not in the intercept (p=0.94) from the line of identity. Predicted values of %HRR were significantly higher (p<0.05) from indicated values of %V˙O(2R) for all the intensities ranging from 35% to 95% V˙O(2R). Unlike results found for lower-body exercise, a given %HRR during prone upper-body exercise was not equivalent to its corresponding %V˙O(2R). Thus, to ensure more targeted exercise intensity during arm-paddling exercise, individual HR-V˙O(2) equations should be used.
authors.affiliation: Physiology Unit, Sport Science Department, ASPIRE Academy for Sports Excellence, Doha, Qatar. amendezvillanueva@yahoo.com
authors.forename: Alberto
authors.initials: A
authors.lastname: Mendez-Villanueva
authors.forename: Javier Pérez
authors.initials: JP
authors.lastname: Landaluce
authors.forename: Benjamín Fernández
authors.initials: BF
authors.lastname: García
authors.forename: Nicolás
authors.initials: N
authors.lastname: Terrados
authors.forename: David
authors.initials: D
authors.lastname: Bishop
mesh_terms: D000328:Adult; D001132:Arm / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D016014:Linear Models; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D013177:Sports / Q000502:physiology*