Intra-limb and muscular coordination during walking on slopes

• Published in: European journal of applied physiology Vol. 120; no. 8; pp. 1841 - 1854
• Main Authors: Dewolf, Arthur H., Mesquita, Raphael M., Willems, Patrick A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2020; Springer Nature B.V
• Subjects: Balance; Biomedical and Life Sciences; Biomedicine; Central nervous system; Coordination; Energy expenditure; Energy Metabolism; Environmental factors; Extremities - physiology; Female; Gait; Gait - physiology; Human Physiology; Humans; Kinematics; Locomotion; Male; Muscle contraction; Muscle, Skeletal - physiology; Neuromuscular system; Occupational Medicine/Industrial Medicine; Original Article; Postural Balance; Psychomotor Performance; Sports Medicine; Walking; Young Adult; Coordination; Continuous relative phase; Basic activation pattern; Neuromuscular control
• ISSN: 1439-6319; 1439-6327; 1439-6327
• DOI: 10.1007/s00421-020-04415-4

Purpose Intra-limb and muscular coordination during gait are the result of the organisation of the neuromuscular system, which have been widely studied on a flat terrain. Environmental factors, such as the inclination of the terrain, is a challenge for the postural control system to maintain balance. Therefore, we hypothesised that the central nervous system flexibly modifies its control strategies during locomotion on slopes. Methods Ten subjects walked on an inclined treadmill at different slopes (from − 9° to + 9°) and speeds (from 0.56 to 2.22 m s −1 ). Intra-limb coordination was investigated via the Continuous Relative Phase, whereas muscular coordination was investigated by decomposing the coordinated muscle activation profiles into Basic Activation Patterns. Results A greater stride to stride variability of kinematics was observed during walking on slopes, as compared to walking on the level. On positive slopes, the stride period and width present a greater variability without modification of the time-pattern of the muscular activation and of the variability of intersegmental coordination. On negative slopes, the stride width is larger, the variability of the stride period and of the inter-segmental coordination is greater and the basic activation patterns become broader, especially at slow speeds. Conclusion Our findings suggest that the control strategy of downhill walking corresponds to a more conservative gait pattern, which could be adopted to lower the risk of falling at the cost of a greater energy consumption. In uphill walking, where metabolic demands are high, the strategy adopted may be planned to minimise energy expenditure.