Thomson Athol, Whiteley Rodney, Hansen Clint, Welzel Julius, Racinais Sebastien, Wilson Mathew G
Aspetar Orthopaedic & Sports Medicine Hospital, PO Box 29222, Doha, Qatar.
Discipline of Podiatry, School of Allied health, La Trobe University, Melbourne, Victoria, 3086, Australia.
BMC Sports Sci Med Rehabil. 2021 Mar 30;13(1):34. doi: 10.1186/s13102-021-00258-4.
Anti-gravity treadmills are used to decrease musculoskeletal loading during treadmill running often in return to play rehabilitation programs. The effect different gradients (uphill/downhill running) have on kinetics and spatiotemporal parameters when using an AlterG® treadmill is unclear with previous research focused on level running only.
Ten well-trained healthy male running athletes ran on the AlterG® treadmill at varying combinations of bodyweight support (60, 80, and 100% BW), speed (12 km/hr., 15 km/hr., 18 km/hr., 21 km/hr., and 24 km/hr), and gradients (- 15% decline, - 10, - 5, 0, + 5, + 10 + 15% incline), representing a total of 78 conditions performed in random order. Maximum plantar force and contact time were recorded using a wireless in-shoe force sensor insole system.
Regression analysis showed a linear relationship for maximum plantar force with bodyweight support and running speeds for level running (p < 0.0001, adj. R = 0.604). The linear relationship, however, does not hold for negative gradients at speeds 12 & 15 km/h, with a relative 'dip' in maximum plantar force across all assisted bodyweight settings.
Maximum plantar force peaks are larger with faster running and smaller with more AlterG® assisted bodyweight support (athlete unweighing). Gradient made little difference except for a downhill grade of - 5% decreasing force peaks as compared to level or uphill running.
反重力跑步机常用于在跑步机跑步过程中减轻肌肉骨骼负荷，这在重返运动康复计划中很常见。以往的研究仅聚焦于平地跑步，而使用AlterG®跑步机时，不同坡度（上坡/下坡跑步）对动力学和时空参数的影响尚不清楚。
10名训练有素的健康男性跑步运动员在AlterG®跑步机上以不同的体重支持组合（60%、80%和100%体重）、速度（12公里/小时、15公里/小时、18公里/小时、21公里/小时和24公里/小时）以及坡度（-15%下坡、-10%、-5%、0%、+5%、+10%、+15%上坡）进行跑步，共78种情况，随机顺序进行。使用无线鞋内压力传感器鞋垫系统记录最大足底力和接触时间。
回归分析表明，平地跑步时最大足底力与体重支持和跑步速度呈线性关系（p < 0.0001，调整后R = 0.604）。然而，在速度为12公里/小时和15公里/小时时，负坡度的线性关系不成立，在所有辅助体重设置下最大足底力出现相对“下降”。
跑步速度越快，最大足底力峰值越大；AlterG®辅助体重支持越多（运动员减重），峰值越小。除了-5%的下坡坡度相比平地或上坡跑步会降低力峰值外，坡度的影响不大。
