Effects of postural instability on the coordination between posture and arm reaching

Tomita, Y.; Iizuka, Tomoki; Turpin, Nicolas A.

doi:10.1016/j.humov.2023.103088

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Twenty-six older adults (12 males and 14 females, 70.9 ± 7.4 years) and 21 younger adults (16 males and 5 females, 25.4 ± 5.0 years) participated. The sample sizes were determined based on similar studies (11,20,21) and a priori power analysis assuming a correlation analysis. We calculated the sample size based on the power analyses with G * Power: effect size = 0.5, significant threshold (α) = 0.05 and power levels (1-β) = 0.8.…”

Section: Methods Participantsmentioning

confidence: 99%

Motor flexibility to stabilize the toe position during obstacle crossing in older adults: an investigation using an uncontrolled manifold analysis

Suda,

Kodama,

Nakamura

et al. 2024

Front. Sports Act. Living

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IntroductionAn age-related decrease in the ability to exploit the abundant degrees of freedom of the body, referred to as motor flexibility, leads to a heightened fall risk. The present study investigated motor flexibility to stabilize the toe position during obstacle crossing in older adults and its correlation with the magnitude of foot elevation.MethodsTwenty-six older adults (70.9 ± 7.4 years old) and 21 younger adults (25.4 ± 5.0 years old) walked and crossed an obstacle, during which the dominant limb was always the leading limb. An uncontrolled manifold (UCM) analysis was used to quantify the flexibility during obstacle crossing as the synergy index, with the vertical toe position being regarded as the performance variable and the segment angles of the lower limbs as the elemental variables.Results and discussionThe results showed that older participants had a significantly lower synergy index for the trailing limb before the moment of obstacle crossing than younger participants, suggesting reduced flexibility in part. The results also showed that, regardless of age, foot elevation was negatively correlated with the synergy index, suggesting that a so-called “conservative strategy” (i.e., a tendency to show extraordinarily high foot elevation to ensure collision avoidance) may be related to their reduced motor flexibility.

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Section: Methods Participantsmentioning

confidence: 99%