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.
Recognition so you’re able to run the study was obtained from brand new Integrity Panel Northern of the Karolinska Institute in the Karolinska Health (Dnr 03–637), Stockholm, Sweden.
Recruitment away from professionals.
The whole process of interested in users was divided in to numerous tips. It started that have advertisements in 2 significant early morning hit in Stockholm needing participants. Brand new introduction conditions required coming to minimum 20 years dated; living in new Condition of Stockholm (excluding new local government regarding Norrtalje), and you may strolling or bicycling all the way, people length, between home and set out of works otherwise study, and earnestly driving where manner at least one time annually. Responses would-be sent in rates-100 % free by blog post, facsimile, e-mail otherwise by cellular phone. This type of advertising contributed to 2148 anyone volunteering for taking part.
A survey (The fresh Actually Productive Travelling for the Greater Stockholm Questionnaire 1; PACS Q1, because of it into the Swedish and English, pick Supporting information S1 and you will S2 Actions) are sent to this type of volunteers; 2010 were returned shortly after three reminders. The fresh questionnaire composed 35 issues, but precisely the issues relevant for selecting the population were utilized inside study. This type of provided sex, age, exactly how truly demanding its elite group work have been, travelling frequencies a week for every few days of the season and you may driving stage. The newest commuting point of any personal has also been employed for looking the study category. These were measured towards paths taken in charts of the for each and every respondent (Having station mapping guidelines, come across Help suggestions S3 and you can S4 Steps). The procedure to possess calculating the newest mapped point try explained in detail within the Schantz and you may Stigell . On the responses regarding PACS Q1, the new participants were divided in to groups centered on the claimed mode out of often bicycling or taking walks, otherwise joint methods.
The try try chose from the cyclist group, we.age. those individuals subjects just who only cycled to operate. Other requirements was ages and you may channel ranges close to the average viewpoints of one’s male and female cyclists, respectively . People also rated their everyday elite group operate while the yourself white otherwise most light.
Information explaining the emotional knowledge, test and standardization measures together with a health report try sent to the fresh new riders just who came across the newest criteria (on recommendations question, select Support pointers S5 and you will S6 Steps. The individual envisioned inside S5 and you will S6 Procedures has provided authored informed consent (because intricate within the PLOS concur mode) to create their picture together with the manuscript. About missive letter, brand new recipients was in fact requested if the in earlier times pulled channel had been valid, otherwise from an identical length date-smart (comparable recognized as together with/without 5 so you’re able to ten full minutes). In that case, they certainly were asked to answer the medical statement and therefore alarmed whether they had people: 1) treatment and kind out of issues, 2) tremors, tits pain otherwise unusually heavier breathing during do so, 3) elevated blood pressure, otherwise 4) got recently averted or abandoned do it for grounds regarding burns off otherwise health. The brand new page showcased the ability to terminate the fresh examination any kind of time some time without the need to identify an explanation. A signed informed consent out of participation is returned.