Reduced joint motion supersedes asymmetry in explaining increased metabolic demand during walking with mechanical restriction.
Reduced joint motion supersedes asymmetry in explaining increased metabolic demand during walking with mechanical restriction.
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DOI：
10.1016/j.jbiomech.2021.110621
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发表时间：
2021-09-20
影响因子：
2.4
通讯作者：
Saul KR
中科院分区：
文献类型：
--
作者：
McCain EM;Berno ME;Libera TL;Lewek MD;Sawicki GS;Saul KR
最近的研究强调了慢性损伤或疾病引起的关节限制，行走对称性和代谢成本增加之间的复杂相互作用。由于并发的神经和生理变化，在临床人群中确定不对称或关节损伤的特定代谢影响是困难的。这项工作调查的代谢影响步态不对称和关节限制单侧（不对称）和双侧（对称）限制踝关节，膝关节，踝关节和膝关节的运动范围在未受损的个人。我们计算了平均步态周期的推进不对称性、时间不对称性和步长不对称性;代谢率;使用个体肢体方法的平均正质心功率;以及使用下肢肌电图测量值按相应生理横截面积加权的肌肉努力。单侧限制导致推进和时间不对称，但代谢昂贵的步态比双边限制。不对称性的变化与代谢成本的变化无关。有趣的是，双边限制增加平均正质心功率相比，单边限制。此外，平均正质心功率的增加与能量成本的增加相关，这表明不对称的逐步过渡并不驱动代谢变化。受限关节的数量减少了可用的自由度，并且可能比步态不对称具有更大的代谢影响，因为这与7/9名参与者的代谢率增加显著相关。这些结果强调对称性不是代谢最佳的定义，表明对称性的力学基础是有意义的，并建议在设计未来的干预措施时应考虑可用的自由度。
Recent research has highlighted the complex interactions among chronic injury- or disease-induced joint limitations, walking symmetry, and increased metabolic cost. Determining the specific metabolic impacts of asymmetry or joint impairment in clinical populations is difficult because of concurrent neurological and physiological changes. This work investigates the metabolic impact of gait asymmetry and joint restriction by unilaterally (asymmetric) and bilaterally (symmetric) restricting ankle, knee, and combined ankle and knee ranges of motion in unimpaired individuals. We calculated propulsive asymmetry, temporal asymmetry, and step-length asymmetry for an average gait cycle; metabolic rate; average positive center of mass power using the individual limbs method; and muscle effort using lower limb electromyography measurements weighted by corresponding physiological cross-sectional areas. Unilateral restriction caused propulsive and temporal asymmetry but less metabolically expensive gait than bilateral restriction. Changes in asymmetry did not correlate with changes in metabolic cost. Interestingly, bilateral restriction increased average positive center of mass power compared to unilateral restriction. Further, increased average positive center of mass power correlated with increased energy costs, suggesting asymmetric step-to-step transitions did not drive metabolic changes. The number of restricted joints reduces available degrees of freedom and may have a larger metabolic impact than gait asymmetry, as this correlated significantly with increases in metabolic rate for 7/9 participants. These results emphasize symmetry is not by definition metabolically optimal, indicate that the mechanics underlying symmetry are meaningful, and suggest that available degrees of freedom should be considered in designing future interventions.
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影响因子：
4.2
作者：
Awad LN;Palmer JA;Pohlig RT;Binder-Macleod SA;Reisman DS
通讯作者：
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DOI：
10.1098/rspb.2009.0664
发表时间：
2009-10-22
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