Ranging from low intensities from take action and you may others, the hill of one’s linear relationships between VO

Ranging from low intensities from take action and you may others, the hill of one’s linear relationships between VO

Ranging from low intensities from take action and you may others, the hill of one’s linear relationships between VO
Our very own email address details are according to that from McCrory mais aussi al

One reason for the good reproducibility on the group level for model 1, despite only making use of three submaximal 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, https://datingranking.net/pl/down-dating-recenzja 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, the fresh new actions out of twenty four-hour Hour from the Christensen mais aussi 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 % 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.

Having stated that, one should keep in mind that the fresh outside authenticity from the findings in relation to other types of participants is actually not sure. Thus, so you can submit the general studies during these areas, there clearly was in fact a significance of further knowledge ones things.

Additionally, we do not know any thing concerning the additional validity of one’s Hr approach in the laboratory regarding field requirements instance once the during the years commuting. About three studies have checked-out this new intensity of cycle commuting playing with more Time procedures for the samples of non-normal period commuters [forty five, 46, 47]. But not, not one of those knowledge considered that, for explanations for example cardiovascular drift which have expanded work periods [several, forty eight, 49] otherwise fret due to travelers requirements [50, 51], the partnership mentioned throughout the laboratory can differ whenever in a routine commuting environment, which thus new indicated concentration of cycle travelling might possibly be completely wrong. It is the focus inside our then degree.

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