Linear relations from regression equations, based on values from three submaximal work rates at test and retest, are illustrated as unbroken lines. dos can be higher, equal or lower at test compared to retest (see broken lines).
Another factor, likely to determine the degree of reproducibility, is the number and span of work rates that are used to establish the HR-VO2 relations. To enable systematic studies of these matters it is therefore important to specify the HR levels used in terms of both absolute levels and percentages of maximal HR as well as the heart rate reserve (HRR) [27,28]. The corresponding levels of VO2 and their percentage of the maximal oxygen uptake are also valuable to state (Fig 1). To our knowledge this has not been done before.
Given this background, the aim of the study was to evaluate day-to-day reproducibility of HR-VO2 regression equations (y-intercept, slope and correlation coefficient) and the estimated oxygen uptakes based on three levels of heart rates representative for everyday cycle commuting. Two HR-VO2 relations were established and compared, one with three levels of submaximal exercise (model 1), and another which also included a maximal exercise (model 2). The HR-VO2 relations were attained on an ergometer cycle in the laboratory for healthy and physically active middle-aged male and female cycle commuters.
Acceptance in order to make the study try obtained from the fresh new Ethics Panel North of one’s Karolinska Institute on Karolinska Medical (Dnr 03–637), Stockholm, Sweden.
Employment away from people.
The process of trying to find users is divided into numerous steps. They started which have advertisements in two big morning click in Stockholm needing users. The fresh addition criteria requisite being at the very least 2 decades dated; staying in the fresh new County off Stockholm (leaving out the fresh new municipality off Norrtalje), and you can strolling otherwise bicycling right, one point, anywhere between home and put from functions or study, and you will definitely travelling for the reason that manner one or more times a year. Responses might possibly be submitted prices-totally free by the article, facsimile, e-mail otherwise of the phone. This type of adverts resulted in 2148 individuals volunteering to take region.
A questionnaire (The Truly Energetic Driving into the Better Stockholm Survey step one; PACS Q1, for it when you look at the Swedish and you can English, pick Support information S1 and you will S2 Methods) is actually sent to this type of volunteers; 2010 were returned after about three reminders. The fresh new questionnaire constructed thirty-five issues, however, only the questions related for choosing our society were used contained in this investigation. Such provided intercourse, decades, just how yourself strenuous its top-notch work was, commuting wavelengths weekly for each and every day of the year and you may travelling course. The fresh new travelling range of each and every personal has also been useful finding the study category. These people were counted towards the routes consumed in charts from the for every single respondent (To own channel mapping tips, come across Supporting information S3 and you can S4 Actions). The process to possess computing the latest mapped range is actually revealed in detail from inside the Schantz and Stigell . Throughout the responses from PACS Q1, this new respondents was indeed divided in to classes considering its said mode regarding either bicycling or walking, or combined modes.
All of our attempt is chose on cyclist classification, i.age. those people sufferers whom only cycled to work. Most other standards had been decades and channel distances nearby the median beliefs of male and female riders, correspondingly . Individuals along with rated its each day elite group services as the really white or most light.
Pointers explaining the fresh new psychological studies, test and standardization steps and additionally a health statement is sent to the new riders which came across the brand new requirements (on suggestions procedure, come across Supporting information S5 and you can S6 Methods. The individual pictured when you look at the S5 and S6 Measures has provided authored advised consent (since outlined into the PLOS concur means) to post their image together with the manuscript. Regarding the missive page, the fresh new receiver had been questioned whether its previously drawn route had been appropriate, otherwise out-of a similar point time-wise (similar identified as and additionally/without 5 to 10 minutes). In that case, they were questioned to resolve the health statement which alarmed whether they had one: 1) therapy and type from disease, 2) palpitations, bust serious pain or unusually heavy respiration while in the do so, 3) elevated blood pressure, or cuatro) got recently avoided otherwise left behind do it getting explanations out of burns otherwise health. The newest letter emphasized the authority to terminate this new evaluating any kind of time some time and without the need to stipulate a reason. A signed advised agree away from involvement try came back.