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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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Margaret K.Y. Mak, Oron Levin, Joseph Mizrahi and Christina W.Y. Hui-Chan

Calculation of joint torques during the rising phase of sit-to-stand motion is in most cases indeterminate, due to the unknown thighs/chair reaction forces in addition to the other sources of uncertainties such as joint positioning and anthropometric data. In the present study we tested the reliability of computation of the joint torques from a five-segment model; we used force plate data of thighs/chair and feet/ground reaction forces, in addition to kinematic measurements. While solving for joint torques before and after seat-off, differences between model solutions and measured data were calculated and minimized using an iterative algorithm for the reestimation of joint positioning and anthropometric properties. The above method was demonstrated for a group of six normal elderly persons.

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Lennart Scheys, Alberto Leardini, Pius D. Wong, Laurent Van Camp, Barbara Callewaert, Johan Bellemans and Kaat Desloovere

The availability of detailed knee kinematic data during various activities can facilitate clinical studies of this joint. To describe in detail normal knee joint rotations in all three anatomical planes, 25 healthy subjects (aged 22–49 years) performed eleven motor tasks, including walking, step ascent and descent, each with and without sidestep or crossover turns, chair rise, mild and deep squats, and forward lunge. Kinematic data were obtained with a conventional lower-body gait analysis protocol over three trials per task. To assess the repeatability with standard indices, a representative subset of 10 subjects underwent three repetitions of the entire motion capture session. Extracted parameters with good repeatability included maximum and minimum axial rotation during turning, local extremes of the flexion curves during gait tasks, and stride times. These specific repeatable parameters can be used for task selection or power analysis when planning future clinical studies.

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Different Body Mass Index Categories and Chair Rise Performance in Adult Women Stefan Schmid * Stéphane Armand * Zoltan Pataky * Alain Golay * Lara Allet * 12 2013 29 6 705 711 10.1123/jab.29.6.705 The Effect of Two Movement Strategies on Shoulder Resultant Joint Moment During Elastic Resistance

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

.A. ( 1991 ). Mechanics of a constrained chair-rise . Journal of Biomechanics, 24 ( 1 ), 77 – 85 . PubMed ID: 2026635 doi:10.1016/0021-9290(91)90328-K 10.1016/0021-9290(91)90328-K Rodosky , M.W. , Andriacchi , T.P. , & Andersson , G.B. ( 1989 ). The influence of chair height on lower limb

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Anne Sofie B. Malling, Bo M. Morberg, Lene Wermuth, Ole Gredal, Per Bech and Bente R. Jensen

of tremor and rigidity, etc.), and the score is, to some extent, rater dependent, while the STS task is specific (duration of five consecutive chair rises) and is measured objectively. Intuitively, since motor function is expected to be negatively influenced by age, an association between performance

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

PubMed database search syntax were as follows: (“sit-to-stand” OR “sit to stand” OR “chair* rise*” OR “chair-rise” OR “chair* stand*” OR “stand* up”) AND (“kinematic*” OR “biomechanic*”) AND (“spin*” OR “trunk” OR “torso*” OR “back”) AND 2002/01/01:2017/02/31[dp]. Figure 1 —Preferred Reporting Items for

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Kai Yan Lui, Patricia Hewston and Nandini Deshpande

-7634(97)00031-6 McGibbon , C.A. , Krebs , D.E. , & Scarborough , D.M. ( 2001 ). Vestibulopathy and age effects on head stability during chair rise . Acta Oto-Laryngologica, 121 ( 1 ), 52 – 58 . PubMed doi:10.1080/000164801300006272 10.1080/000164801300006272 Mourey , F. , Grishin , A. , d’Athis , P

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

; 19 ( 2 ): 137 – 144 . doi:10.1097/00013614-200304000-00007 10.1097/00013614-200304000-00007 26. Hughes MA , Weiner DK , Schenkman ML , Long RM , Studenski SA . Chair rise strategies in the elderly . Clin Biomech . 1994 ; 9 ( 3 ): 187 – 192 . doi:10.1016/0268-0033(94)90020-5 10

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Mary Hellen Morcelli, Dain Patrick LaRoche, Luciano Fernandes Crozara, Nise Ribeiro Marques, Camilla Zamfolini Hallal, Mauro Gonçalves and Marcelo Tavella Navega

from the present study to functional activities other than walking (eg, chair rise or stair climb) must be performed with caution. Future investigations should aim to identify the neuromuscular determinants of rate of torque development, explore how strength and rate of torque development impact the