Water depth effects on impact loading, kinematic and physiological variables during water treadmill running

作者：Macdermid Paul W^*; Wharton Josh; Schill Carina; Fink Philip W

来源：Gait & Posture, 2017, 56: 108-111.

DOI：10.1016/j.gaitpost.2017.05.013

• Water treadmill
• Running
• Gait
• Impact loading

Purpose: The purpose of this study was to compare impact loading, kinematic and physiological responses to three different immersion depths (mid-shin, mid-thigh, and xiphoid process) while running at the same speed on a water based treadmill.
Methods: Participants (N = 8) ran on a water treadmill at three depths for 3 min. Tri-axial accelerometers were used to identify running dynamics plus measures associated with impact loading rates, while heart rate data were logged to indicate physiological demand.
Results: Participants had greater peak impact accelerations (p < 0.01), greater impact loading rates (p < 0.0001), greater stride frequency (p < 0.05), shorter stride length (p < 0.01), and greater rate of acceleration development at toe-off (p < 0.0001) for the mid-shin and mid-thigh compared to running immersed to the xiphoid process. Physiological effort determined by heart rate was also significantly less (p < 0.0001) when running immersed to the xiphoid process.
Conclusion: Water immersed treadmill running above the waistline alters kinematics of gait, reduces variables associated with impact, while decreasing physiological demand compared to depths below the waistline.

• 出版日期2017-7