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Individual optimal step frequency during outdoor running

机译:户外运行期间的个人最佳步进频率

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This is the first study investigating preferred (self-selected) step frequency (PSF) in relation to optimal step frequency (OSF) during running at different speeds outside the laboratory. OSF was defined as the SF at which heartrate (HR) showed a minimum during running at a constant speed. We aimed for a high ecological validity, which prohibits the direct measurement of oxygen consumption. HR was used as a proxy of energy cost, as has previously been validated. After a practice session, 21 experienced recreational runners (12 female) ran in an out-and-back manner on a straight flat tarmac lane in three main sessions: (1) 27 min at fixed comfortable speed with PSF, (2) at the same speed but with different imposed SFs (range 140-200 steps min(-1)) and at PSF and (3) similarly but at 15% higher speed. Runners were paced by a cyclist. Second order polynomials fitted the individual SF-HR relations well. At comfortable speed (3.04 +/- 0.28 m s(-1)) mean r(2) was 0.81 (range: 0.40-0.99) and PSF and OSF respectively were 165 +/- 8 and 171 +/- 8 steps min(-1) (p < .05). Both increased (p < .05) by 3 steps min(-1) at the 15% higher speed. SFs were negatively (-0.66 < r < -0.49, p < .05) related to body height. From the individual SF-HR relations we deduced that changing PSF to OSF would decrease median HR only by 0.5 beats min(-1), but for two participants meaningful reductions (1-3 beats min(-1)) were predicted. Outdoors, experienced recreational runners ran at a PSF slightly below OSF, but for most of them, there was little to gain in terms of HR reductions by increasing their SF to OSF.
机译:这是在实验室外不同的速度行驶期间第一项研究调查相对于最优步频率(OSF)优选的(自选择的)步频(PSF)。 OSF被定义为SF在该心率(HR)以恒定速度行驶时显示出最低程度。我们的目的是为高生态效度,即禁止耗氧量的直接测量。人力资源作为能源成本的代理,如前面所验证。在以固定的舒适速度与PSF(1)27分钟,(2):一个练习后,21经历休闲跑步者(12女)在一个外和回方式RAN上的直平面停机坪车道中的三个主要的会话相同的速度但具有不同的施加的SF(范围140-200步骤分钟(-1)),并在PSF和(3)类似地较高,但在15%的速度。运动员被一个骑自行车的节奏。第二阶多项式拟合个体SF-HR的关系很好。在舒适的速度(3.04±0.28毫秒(-1))平均值R(2)为0.81(范围:0.40-0.99)和PSF和OSF分别为165 +/- 8和171 +/- 8步骤分钟( - 1)(p <0.05)。两个升高(p <0.05)由3个步骤分钟(-1)在较高的15%的速度。的SF呈负(-0.66

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