Isokinetic dynamometers are the gold standard tools used to assess in vivo joint and muscle function in human subjects, however, the large size and high cost of these devices prevents their widespread use outside of traditonal biomechanics labs. In this study, we developed a mobile dynamometer to allow for field measurements of joint level function. To ensure subject safety, we designed a new “isodamping” dynamometer that acted as passive energy sink which constrains velocity by forcing incompressible oil through an orifice with an adjustable diameter. We validated the performance of this device by testing plantar flexor function in six healthy adults on both a commercial isokinetic dynamometer and this novel device at three velocities/damper settings and at three different effort levels. During maximal effort contraction, measurements of peak moment and velocity at peak moment of the novel device and the commercial device were strongly correlated along the predicted quadratic line (R² > 0.708, p ≤ 0.008). The setting of the damper prescribed the relationship between peak moment and velocity at peak moment across all subjects and effort levels (R² > 0.910, p < 0.001). The novel device was significantly smaller (0.75 m² footprint), lighter (30 kg), and lower cost (~$2,200 US Dollars) than commercial devices compared to commercially-available isokinetic dynamometers (5.95 m² footprint, 450 kg, and ~$40,000 US Dollars respectively).

等速测功机是用于体内评估的黄金标准工具人类受试者的关节和肌肉功能，然而，这些设备的大尺寸和高成本阻碍了它们在传统生物力学实验室之外的广泛使用。在这项研究中，我们开发了一个移动测功机，允许现场测量关节水平功能。为了确保受试者的安全，我们设计了一种新的“等阻尼”测力计，它充当被动能量吸收器，通过迫使不可压缩的油通过直径可调的孔来限制速度。我们通过在商业等速测力计和这种新型设备上以三种速度/阻尼器设置和三种不同的努力水平测试六名健康成年人的足底屈肌功能来验证该设备的性能。在最大努力收缩期间，²  > 0.708，p  ≤ 0.008）。阻尼器的设置规定了所有受试者和努力水平的峰值力矩和峰值力矩之间的关系（R ²  > 0.910，p  < 0.001）。与商用等速测功机（5.95 m ²占地面积、450 千克和~40,000美元）相比，这种新型设备明显更小（0.75 m ²占地面积）、更轻（30 公斤）和更低的成本（~2,200 美元）美元）。