Kunzler Marcos R, da Rocha Emmanuel S, Bobbert Maarten F, Duysens Jacques, Carpes Felipe P
J Phys Act Health. 2017 Jul;14(7):532-538. doi: 10.1123/jpah.2016-0546. Epub 2017 Mar 14.
In negotiating stairs, low foot clearance increases the risk of tripping and a fall. Foot clearance may be related to physical fitness, which differs between active and sedentary participants, and be acutely affected by exercise. Impaired stair negotiation could be an acute response to exercise. Here we determined acute changes in foot clearances during stair walking in sedentary (n = 15) and physically active older adults (n = 15) after prolonged exercise.
Kinematic data were acquired during negotiation with a 3-steps staircase while participants walked at preferred speed, before and after 30 min walking at preferred speed and using a treadmill. Foot clearances were compared before and after exercise and between the groups.
Sedentary older adults presented larger (0.5 cm for lead and 2 cm for trail leg) toe clearances in ascent, smaller (0.7 cm) heel clearance in the leading foot in descent, and larger (1 cm) heel clearance in the trailing foot in descent than physically active.
Sedentary older adults negotiate stairs in a slightly different way than active older adults, and 30 min walking at preferred speed does not affect clearance in stair negotiation.
在上下楼梯时，较低的足部净空会增加绊倒和摔倒的风险。足部净空可能与身体素质有关，活跃参与者和久坐参与者的身体素质有所不同，并且运动会对其产生急性影响。上下楼梯能力受损可能是运动的急性反应。在此，我们确定了久坐不动的老年人（n = 15）和身体活跃的老年人（n = 15）在长时间运动后上下楼梯时足部净空的急性变化。
在参与者以偏好速度行走于三步楼梯的过程中，在以偏好速度在跑步机上行走30分钟之前和之后，采集运动学数据。比较运动前后以及两组之间的足部净空。
与身体活跃的老年人相比，久坐不动的老年人在上楼梯时前脚掌的趾部净空更大（领先脚为0.5厘米，跟随脚为2厘米），在下楼梯时领先脚的脚跟净空更小（0.7厘米），跟随脚的脚跟净空更大（1厘米）。
久坐不动的老年人上下楼梯的方式与身体活跃的老年人略有不同，以偏好速度行走30分钟不会影响上下楼梯时的净空。
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