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Andrew H. Huntley, John L. Zettel and Lori Ann Vallis

A simultaneous turn and step motion is a vital component of many complex movements and may provide insight into age related balance and stability deficits during a weight transfer task. In this study, nine young adults and ten healthy, community dwelling older adults performed a simultaneous “turn and step” task from a quiet standing position under two self-selected speeds, self-paced and as quickly and efficiently as possible. Whole-body center of mass was estimated to investigate stability, segmental coordination, and variability. Older adults performed the task with greater variability, however they were unable to alter stability nor segmental coordination across the self-selected speeds; absence of this modulation portrays a trade-off between stability and manoeuvrability. An increase in variability with no observed directional differences suggests that the simultaneous turn and step task may be a sensitive discriminatory motor task helpful in elucidating the adoption of altered control strategies used by elderly populations.

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Shuaijie Wang, Yiru Wang, Yi-Chung (Clive) Pai, Edward Wang and Tanvi Bhatt

biomechanical factor(s) that could differentiate fall and nonfall within the LOB class, as well as walkover and skate over within the no-LOB class. Methods Subjects A total of 67 community-dwelling older adults were included in this study (age: 72.2 [5.3] y, height: 166.6 [15.1] cm, mass: 75.6 [12.7] kg, female

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Nathan F. Johnson, Chloe Hutchinson, Kaitlyn Hargett, Kyle Kosik and Phillip Gribble

community-dwelling older adults. The timed up and go (TUG) and 5 times sit-to-stand (5×STS) scores are 2 of the 3 most evidence-supported performance-based measures for assessing fall risk in community-based older adults. 3 TUG performance is predictive of fall history and future falls in older adults. 18

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Rachel L. Wright, Joseph W. Bevins, David Pratt, Catherine M. Sackley and Alan M. Wing

condition. Methods A total of 10 community-dwelling adults (6 males and 4 females) with chronic hemiparesis following a stroke gave written informed consent to participate in the study (see Table  1 ). Favorable ethical opinion was granted by the Local Research Ethics Committee, and the study was carried

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George J. Salem, Sean P. Flanagan, Man-Ying Wang, Joo-Eun Song, Stanley P. Azen and Gail A. Greendale

Stepping activities when wearing a weighted vest may enhance physical function in older persons. Using 3 weighted-vest resistance dosages, this study characterized the lower-extremity joint biomechanics associated with stepping activities in elders. Twenty healthy community-dwelling older adults, ages 74.5 ± 4.5 yrs, performed 3 trials of forward step-up and lateral step-up exercises while wearing a weighted vest which added 0% body weight (BW), 5% BW, or 10% BW. They performed these activities on a force platform while instrumented for biomechanical analysis. Repeated-measures ANOVA was used to evaluate the differences in ankle, knee, and hip maximum joint angles, peak net joint moments, joint powers, and impulses among both steping activities and the 3 loading conditions. Findings indicated that the 5% BW vest increased the kinetic output associated with the exercise activities at all three lower-extremity joints. These increases ranged from 5.9% for peak hip power to 12.5% for knee extensor impulse. The application of an additional 5% BW resistance did not affect peak joint moments or powers, but it did increase the joint impulses by 4–11%. Comparisons between exercise activities, across the 3 loading conditions, indicated that forward stepping preferentially targeted the hip extensors while lateral stepping targeted the plantar flexors; both activities equally targeted the knee extensors. Weighted-vest loads of 5% and 10% BW substantially increased the mechanical demand on the knee extensors, hip extensors (forward stepping), and ankle plantar flexors (lateral stepping).

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Michelle R. Tanel, Tyler B. Weaver and Andrew C. Laing

Falls are the leading cause of injury in older adults above the age of 65, with approximately 1 in 3 community-dwelling older adults experiencing a fall every year. 1 , 2 Previous research has suggested that 20% of these falls will result in serious injury, including hip and traumatic brain

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Senia Smoot Reinert, Allison L. Kinney, Kurt Jackson, Wiebke Diestelkamp and Kimberly Bigelow

, Burns YR , Galley P . A prospective study of laboratory and clinical measures of postural stability to predict community-dwelling fallers . J Gerontol Ser A Biol Sci Med Sci . 2000 ; 55 ( 8 ): M469 – M476 . doi:10.1093/gerona/55.8.M469 10.1093/gerona/55.8.M469 4

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Leigh J. Allin, Maury A. Nussbaum and Michael L. Madigan

-related injuries by age and gender among community-dwelling adults in the United States . PLoS ONE . 2017 ; 12 ( 5 ): 0176561 . PubMed ID: 28472065 doi:10.1371/journal.pone.0176561 10.1371/journal.pone.0176561 4. Marigold DS , Bethune AJ , Patla AE . Role of the unperturbed limb and arms in the

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Takashi Abe, Jeremy P. Loenneke, Robert S. Thiebaud and Mark Loftin

; 95 : 1851 – 1860 . PubMed ID: 14555665 doi:10.1152/japplphysiol.00246.2003 10.1152/japplphysiol.00246.2003 14555665 6. Tanimoto Y , Watanabe M , Sun W , et al . Association between sarcopenia and higher-level functional capacity in daily living in community-dwelling elderly subjects in

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Timothy A. Hanke, Bruce Kay, Michael Turvey and David Tiberio

YAs, 1.71 (0.09) m for the MAs, and 1.7 (0.13) m for the OAs. The mean mass was 61.83 (8.07) kg for the YAs, 72.98 (11.84) kg for the MAs, and 75.77 (16.23) kg for the OAs. Subjects had to be healthy community-dwelling, and without a history of falling or major neurological or musculoskeletal medical