Our very own results are relative to those of McCrory mais aussi al

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).

Eventually, this new procedures of twenty four-hr Hour of the Christensen ainsi que al

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 % HR_max used to establish the HR-VO₂ relations related well to the expected VO₂ relative to VO_2max 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.

Having adam4adam reported that, one has to just remember that , brand new exterior validity from our very own findings in relation to other kinds of players are unclear. Therefore, to submit the general education in these respects, there is certainly in fact a need for then degree of those things.

In addition, we do not know any thing in regards to the exterior validity of the Hours means on lab about field standards such as given that throughout the stage commuting. Three research has looked at the brand new intensity of years travelling using other Time procedures inside samples of non-regular course commuters [forty-five, 46, 47]. Although not, none ones degree believed that, to own factors particularly cardio float which have lengthened work intervals [12, forty eight, 49] otherwise worry due to site visitors requirements [fifty, 51], the connection counted about laboratory may differ whenever in a period driving ecosystem, and therefore consequently the latest shown concentration of stage travelling could be incorrect. This is certainly the main focus within subsequent knowledge.