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.
Professionals
Recognition so you can perform the analysis is actually obtained from brand new Stability Panel Northern of your own Karolinska Institute at Karolinska Hospital (Dnr 03–637), Stockholm, Sweden.
Recruitment from users.
The whole process of looking for people is actually divided into several actions. It been with ads in 2 biggest early morning push inside Stockholm demanding users. Brand new addition conditions called for coming to the very least two decades dated; located in this new County of Stockholm (excluding new local government out-of Norrtalje), and you can strolling otherwise cycling completely, any range, ranging from domestic and set of work otherwise study, and you can positively driving in that manner at least one time a year. Solutions is submitted rates-totally free by article, facsimile, e-post or from the cell phone. This type of advertisements contributed to 2148 individuals volunteering when deciding to take part.
A survey (This new Yourself Effective Driving for the Higher Stockholm Survey step one; PACS Q1, for this during the Swedish and you may English, come across Supporting information S1 and S2 Steps) is sent to this type of volunteers; 2010 was indeed came back just after about three reminders. The fresh questionnaire made up thirty-five issues, but only the issues related for selecting all of our society were used in this analysis. This type of incorporated intercourse, many years, exactly how in person strenuous the professional jobs was indeed, commuting wavelengths weekly for each month of the season and you will driving cycle. The fresh new travelling length each and every individual was also useful interested in the research group. These people were mentioned to the pathways taken in charts by the for each and every respondent (To possess channel mapping tips, see Support advice S3 and you may S4 Strategies). The procedure getting computing the brand new mapped range try described in detail within the Schantz and you will Stigell . On the solutions out-of PACS Q1, the latest respondents was split up into categories based on its said function of sometimes bicycling or taking walks, otherwise joint methods.
The test is actually chosen throughout the cyclist group, we.elizabeth. people victims just who simply cycled to your workplace. Other requirements had been decades and station distances near the average viewpoints of the men and women riders, respectively . Applicants including ranked the day-after-day elite group work as the really light or extremely white.
Recommendations discussing the fresh physiological degree, ensure that you standardization measures also a medical declaration was taken to new riders exactly who satisfied the fresh new standards (to your information question, pick Help guidance S5 and you will S6 Methods. The person pictured for the S5 and S6 Procedures has provided written informed consent (while the outlined when you look at the PLOS concur form) to publish his photo together with the manuscript. Throughout the missive page, brand new receiver were requested whether or not its in earlier times pulled station was still valid, or off an equivalent point time-smart (similar identified as together with/minus 5 so you can 10 minutes). Therefore, they were requested to respond to medical statement and that alarmed whether or not they had any: 1) procedures and kind out-of infection, 2) tremors, boobs soreness or abnormally heavy breathing throughout the get it done, 3) raised blood pressure, or 4) had has just avoided or abandoned do so having grounds 
of injury or health. Brand new page emphasized the legal right to terminate the new examination any kind of time some time and without the need to identify a description. A signed informed consent away from participation are returned.
