Salier Eriksson Jane, Olsson Karin S E, Rosdahl Hans, Schantz Peter
The Research Unit for Movement, Health and Environment, Department of Physical Activity and Health, The Swedish School of Sport and Health Sciences, GIH, Stockholm, Sweden.
The Research Unit for Movement, Health and Environment, Department of Physiology, Nutrition and Biomechanics, The Swedish School of Sport and Health Sciences, GIH, Stockholm, Sweden.
Front Physiol. 2021 Jul 6;12:687566. doi: 10.3389/fphys.2021.687566. eCollection 2021.
Quantifying intensities of physical activities through measuring oxygen uptake (V̇O) is of importance for understanding the relation between human movement, health and performance. This can in principle be estimated by the heart rate (HR) method, based on the linear relationship between HR and V̇O established in the laboratory. It needs, however, to be explored whether HR methods, based on HR-V̇O relationships determined in the laboratory, are valid for estimating spectrums of V̇O in field exercise. We hereby initiate such studies, and use cycle commuting as the form of exercise.
Ten male and ten female commuter cyclists underwent measurements of HR and V̇O while performing ergometer cycling in a laboratory and a normal cycle commute in the metropolitan area of Stockholm County, Sweden. Two models of individual HR-V̇O relationships were established in the laboratory through linear regression equations. Model 1 included three submaximal work rates, whereas model 2 also involved a maximal work rate. The HR-V̇O regression equations of the two models were then used to estimate V̇O at six positions of field HR: five means of quintiles and the mean of the whole commute. The estimations obtained were for both models compared with the measured V̇O.
The measured quintile range during commuting cycling was about 45-80% of V̇Omax. Overall, there was a high resemblance between the estimated and measured V̇O, without any significant absolute differences in either males or females (range of all differences: -0.03-0.20 L⋅min). Simultaneously, rather large individual differences were noted.
The present HR methods are valid at group level for estimating V̇O of cycle commuting characterized by relatively wide spectrums of exercise intensities. To further the understanding of the external validity of the HR method, there is a need for studying other forms of field exercises.
通过测量摄氧量（V̇O）来量化身体活动强度对于理解人体运动、健康和体能表现之间的关系至关重要。原则上，这可以通过心率（HR）法来估计，该方法基于实验室中建立的HR与V̇O之间的线性关系。然而，基于实验室确定的HR-V̇O关系的HR方法是否适用于估计野外运动中的V̇O谱仍有待探索。我们特此开展此类研究，并将自行车通勤作为运动形式。
10名男性和10名女性通勤自行车骑行者在实验室进行测力计骑行以及在瑞典斯德哥尔摩县大都市区进行正常的自行车通勤时，接受了HR和V̇O测量。通过线性回归方程在实验室建立了两种个体HR-V̇O关系模型。模型1包括三个次最大工作率，而模型2还涉及一个最大工作率。然后使用这两种模型的HR-V̇O回归方程来估计野外HR六个位置的V̇O：五分位数的五个均值和整个通勤的均值。将两种模型获得的估计值与测量的V̇O进行比较。
通勤骑行期间测量的五分位数范围约为V̇Omax的45%-80%。总体而言，估计的V̇O与测量的V̇O高度相似，男性和女性的绝对差异均无统计学意义（所有差异范围：-0.03-0.20 L·min）。同时，注意到个体差异相当大。
目前的HR方法在群体水平上对于估计以相对较宽运动强度谱为特征的自行车通勤的V̇O是有效的。为了进一步理解HR方法的外部有效性，需要研究其他形式的野外运动。
