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Hiroshi R. Yamasaki, Hiroyuki Kambara, and Yasuharu Koike

The purpose of this study was to clarify criteria that can predict trajectories during the sit-to-stand movement. In particular, the minimum jerk and minimum torque-change models were examined. Three patterns of sit-to-stand movement from a chair, i.e., upright, natural, and leaning forward, were measured in five young participants using a 3-D motion analysis device (200 Hz). The trajectory of the center of mass and its smoothness were examined, and the optimal trajectories predicted by both models were evaluated. Trajectories of the center of mass predicted by the minimum torque-change model, rather than the minimum jerk model, resembled the measured movements in all rising movement patterns. The upright pattern required greater extension torque of the knee and ankle joints at the instant of seat-off. The leaning-forward pattern required greater extension hip torque and higher movement cost than the natural and upright patterns. These results indicate that the natural sit-to-stand movement might be a result of dynamic optimization.

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Mohammad Reza Pourahmadi, Ismail Ebrahimi Takamjani, Shapour Jaberzadeh, Javad Sarrafzadeh, Mohammad Ali Sanjari, Rasool Bagheri, and Morteza Taghipour

, Ribbers G , Stam H . Recovery of the sit-to-stand movement after stroke: a longitudinal cohort study . Neurorehabil Neural Repair . 2010 ; 24 ( 8 ): 763 – 769 . PubMed ID: 20702392 doi:10.1177/1545968310363584 10.1177/1545968310363584 20702392 9. Tung FL , Yang YR , Lee CC , Wang RY

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Stefan Schmid, Stéphane Armand, Zoltan Pataky, Alain Golay, and Lara Allet

An important prerequisite to carry out daily activities is the sit-to-stand movement. However, in obese people, this movement is characterized by altered biomechanics, which might lead to daily life activity impairments. The aim of this study was to investigate whether there are differences in kinetic and kinematic variables between three different BMI categories when performing a specific sit-to-stand test. Thirty-six adult women (BMI = 17–45 kg/m2) performed the sit-to stand test five times consecutively and as quickly as possible. Analyses of variance were used to determine differences between three BMI groups (normal or overweight: BMI < 30 kg/m2; obese: 30 ≤ BMI < 35; severely obese: BMI ≥ 35). Peak and mean vertical sacrum velocity indicated a decrease in severely obese subjects. Obese and severely obese individuals did not show higher fatigue over the five consecutive movements. Peak force and rate of force development decreased in normal or overweight subjects. The ability to successfully complete the test decreased with a higher BMI, probably due to a reduced ability to rapidly generate a high force.

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Dimitrios-Sokratis Komaris, Cheral Govind, Andrew Murphy, Alistair Ewen, and Philip Riches

participants and patients with osteoarthritis of the knee. The results obtained in this study are in agreement with the findings in the observation study of older adults and people living with dementia performing the sit-to-stand movement by Dolecka et al. 22 Leaning forward was the most common movement

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Nadège Tebbache and Alain Hamaoui

, E. ( 2015 ). Kinematics and knee muscle activation during sit-to-stand movement in women with knee osteoarthritis . Clinical Biomechanics, 30 ( 6 ), 599 – 607 . PubMed ID: 25846323 doi:10.1016/j.clinbiomech.2015.03.025 10.1016/j.clinbiomech.2015.03.025 Bouisset , S. , & Zattara , M. ( 1981

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Cameron T. Gibbons, Polemnia G. Amazeen, and Aaron D. Likens

control in motor learning . Current Biology, 13 ( 2 ), 146 – 150 . PubMed ID: 12546789 doi:10.1016/S0960-9822(03)00007-1 10.1016/S0960-9822(03)00007-1 Fujimoto , M. , & Chou , L.S. ( 2012 ). Dynamic balance control during sit-to-stand movement: an examination with the center of mass acceleration

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Yuwei Song, Momotaz Begum, Sajay Arthanat, and Dain P. LaRoche

Geriatrics Society, 56 ( 8 ), 1575 – 1577 . PubMed ID: 18808608 doi:10.1111/j.1532-5415.2008.01777.x 10.1111/j.1532-5415.2008.01777.x Chang , C.S. , Leung , C.Y. , Liou , J.J. , & Tsai , W.W. ( 2010 ). Evaluation of key points in the sit-to-stand movement using two force platforms . Perceptual

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Neda Orakifar, Mohammad Jafar Shaterzadeh-Yazdi, Reza Salehi, Mohammad Mehravar, Neda Namnik, and Seyyed Arash Haghpanah

a chair in normal and low back pain subjects . Clin Biomech . 1994 ; 9 ( 2 ): 85 – 92 . doi:10.1016/0268-0033(94)90029-9 10.1016/0268-0033(94)90029-9 16. Yamada T , Demura S-I . Relationships between ground reaction force parameters during a sit-to-stand movement and physical activity and

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Anthony Campitelli, Sally Paulson, Jennifer Vincenzo, Jordan M. Glenn, Joshua L. Gills, Megan D. Jones, Melissa Powers, and Michelle Gray

.J. ( 2002 ). Determinants of the sit-to-stand movement: A review . Physical Therapy, 82 ( 9 ), 866 – 879 . https://doi.org/10.1093/ptj/82.9.866 10.1093/ptj/82.9.866 Kostka , T. ( 2005 ). Quadriceps maximal power and optimal shortening velocity in 335 men aged 23–88 years . European Journal of

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Tomohiro Yasuda

– 119 . PubMed ID: 10380242 doi:10.1080/02701367.1999.10608028 10380242 10.1080/02701367.1999.10608028 16. Yamada T , Demura S . The relationship of force output characteristics during a sit-to-stand movement with lower limb muscle mass and knee joint extension in the elderly . Arch Gerontol