非线性分析揭示了军事人员在户外6.72公里计时赛中负重步态变异性的持续时间和梯度依赖性中断

IF 3.4 2区工程技术 Q2 ENGINEERING, INDUSTRIAL

Applied Ergonomics Pub Date : 2025-09-10 DOI:10.1016/j.apergo.2025.104639

Evan D. Feigel , Ayden McCarthy , Joel T. Fuller , Lily Rosenblum , Mita Lovalekar , Tommi Ojanen , Kai Pihlainen , Brian J. Martin , Kristen J. Koltun , Tim L.A. Doyle , Bradley C. Nindl

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引用次数: 0

摘要

本研究评估了坡度和持续时间对佩戴双惯性测量装置进行负重计时试验的军人步态变异性指数DFA-α的影响。采用步态事件算法将步态数据（N = 14）按梯度（上坡、下坡）划分为256个步幅时间段。去趋势波动分析计算每个段的DFA-α，每个梯度在三分之一持续时间（阶段1-3）内平均。双向重复测量方差分析检查梯度、持续时间和相互作用对DFA-α的影响，并采用bonferroni调整后的事后比较。持续时间（第一阶段：0.593±0.021；第二阶段：0.563±0.031；第三阶段：0.493±0.021;F = 3.833, p = 0.035, ηp2 = 0.228）是主要影响因素，而坡度（上坡：0.486±0.031；下坡：0.614±0.035;F = 4.252, p = 0.060, ηp2 = 0.246）和相互作用（F = 0.019, p = 0.981, ηp2 = 0.001）则不是主要影响因素。两两比较显示，第3期DFA-α显著低于第1期（p = 0.016）。持续时间和上坡坡度，尽管有很大但不显著的影响，可能代表了改变步态变异性的伤害风险因素。

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Nonlinear analysis reveals duration and gradient-dependent disruption of load carriage gait variability during an outdoor 6.72 km time trial in military personnel

This investigation assessed the effect of gradient and duration on the gait variability exponent, DFA-α, in military personnel affixed with dual inertial measurement units performing a load carriage time-trial. Gait data (N = 14) were partitioned into 256 stride time segments by gradient (uphill, downhill) using a gait event algorithm. Detrended fluctuation analysis calculated DFA-α per segment, which was averaged across one-third durations (phases 1–3) per gradient. Two-way repeated measures ANOVA examined effects of gradient, duration, and interaction on DFA-α, with Bonferroni-adjusted post-hoc comparisons. There was a significant main effect of duration (phase 1: 0.593 ± 0.021; phase 2: 0.563 ± 0.031; phase 3: 0.493 ± 0.021; F = 3.833, p = 0.035, η_p² = 0.228), but not gradient (uphill: 0.486 ± 0.031; downhill: 0.614 ± 0.035; F = 4.252, p = 0.060, η_p² = 0.246), or interaction (F = 0.019, p = 0.981, η_p² = 0.001). Pairwise comparisons revealed significantly lower DFA-α during phase 3 than phase 1 (p = 0.016). Elapsed duration and uphill gradient, despite a large, but non-significant effect, may represent factors altering gait variability for injury risk.

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来源期刊

Applied Ergonomics 工程技术-工程：工业

CiteScore

7.50

自引率

9.40%

发文量

248

审稿时长

53 days

期刊介绍： Applied Ergonomics is aimed at ergonomists and all those interested in applying ergonomics/human factors in the design, planning and management of technical and social systems at work or leisure. Readership is truly international with subscribers in over 50 countries. Professionals for whom Applied Ergonomics is of interest include: ergonomists, designers, industrial engineers, health and safety specialists, systems engineers, design engineers, organizational psychologists, occupational health specialists and human-computer interaction specialists.