One reason for the good reproducibility on the group level for model 1, despite only making use of three submaximumimal work rates, can be the span of the HR attained between work rate 1 and 3 (in average 98–137 and 98–150 for males and females, respectively). It is equally important that the utilized ranges of HR from cycle commuting (in average 113–149 and 118–154 for males and females, respectively) are within, or only slightly above, the range of the HR from the work rates in the laboratory (cf. Tables 3 and 5). If instead VO2 would be estimated from higher or lower HR than those established in the laboratory, it is possible that greater test-retest differences would be seen (cf. Fig 1).
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A comment on the field heart rates used is that almost half the cyclists were tested in the laboratory at a different time of day compared to their cycle commuting tests. However, McCrory et al. found that within-day variations were not significantly different at the higher activity levels in their study, i.e. normal to fast walking. Thus our population probably had levels of intensity that were high enough to eliminate circadian influences. Another comment favoring a stability in the measurement conditions is that the mean values for the positions of % HRmax used to establish the HR-VO2 relations related well to the expected VO2 relative to VO2max in both sexes .
, and considerably more favourable in relation to using the HR-VO2 method than those indicated by Christensen et al. . There are several explanations for that. The measurements used by Christensen et al. for establishing HR-VO2 regression equations were resting and sitting, as well as three low to intermediate exercise rates on an ergometer cycle (8–100 watt) and three exercise rates on a treadmill, thus altogether eight measurement points. For both the slope and the y-intercept of the regression equations, the measurements at low levels of HR are, under those circumstances, more influential. At the same time it is well known that the HR-VO2 ratios at rest and sitting are quite unstable, resulting in variations in regression equations [11, 25, 41]. 2 and HR will be higher after a certain HR level, which has been termed “flex HR” [12, 42, 43], which could be another reason for the results of Christensen et al. . Furthermore, they mixed the work forms of cycle ergometer and treadmill as bases for the HR-VO2 measures, which is in itself problematic, since the HR response for a given VO2 can differ in these different forms of movement . This creates a greater risk for non-stability in regression equations with repeated measurements. resulted in a mean value of 86 beats per minute. In line with the reasoning in the Introduction (cf. Fig 1) a heart rate close to the endpoint of the spectrum of measurement points forming the regression equation will most probably lead to lower reproducibility. Another potential explanation for their results relates to their use of a heterogeneous sample of predominantly patients and large variations in age, whereas we studied a sample of healthy and physically active middle aged individuals.
Which have stated that, one should remember that this new outside legitimacy out-of all of our results about other sorts of people was undecided. Thus, to help you forward the general knowledge during these respects, there is in fact a need for next degree of them things.
Furthermore, we do not know any thing concerning external authenticity of one’s Hr strategy regarding research with regards to job standards including since throughout the course driving. Three research has tested the fresh intensity of stage commuting playing with more Hr tips for the types of non-typical course commuters [forty-five, 46, 47]. Yet not, none of these training thought that, to have grounds such aerobic float which have stretched performs durations [12, forty eight, 49] otherwise worry due to visitors conditions [fifty, 51], the connection mentioned regarding laboratory can vary when being in a period commuting environment, and therefore for that reason the new expressed concentration of duration commuting might possibly be completely wrong. This really is the main focus in our further training.