Comparison of the Lower Extremity Kinematics and Center of Mass Variations in Sit-to-Stand and Stand-to-Sit Movements of Older Fallers and Nonfallers

Lin, Yi-Ting; Lee, Heng-Ju

doi:10.1016/j.arrct.2022.100181

Cited by 9 publications

(10 citation statements)

References 34 publications

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“…The preservation of M-L balance during StandTS is regarded as a more critical factor in maintaining postural stability for successful movement when compared to M-L balance control during the ascending phase of STS. Indeed, in the M-L direction, older fallers showed a significantly greater range of CoM displacement during the StandTS movement when compared to the CoM shift observed during the STS movement ( Lin and Lee, 2022 ). Our findings demonstrated that the contribution of hip joint work is correlated with reduced postural sway in the M-L direction.…”

Section: Discussionmentioning

confidence: 97%

The influence of smoothness and speed of stand-to-sit movement on joint kinematics, kinetics, and muscle activation patterns

Jeon,

Dong,

Dalby

et al. 2024

Front. Hum. Neurosci.

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BackgroundStand-to-sit (StandTS) is an important daily activity widely used in rehabilitation settings to improve strength, postural stability, and mobility. Modifications in movement smoothness and speed significantly influence the kinematics, kinetics, and muscle activation patterns of the movement. Understanding the impact of StandTS speed and smoothness on movement control can provide valuable insights for designing effective and personalized rehabilitation training programs.Research questionHow do the smoothness and speed of StandTS movement affect joint kinematics, kinetics, muscle activation patterns, and postural stability during StandTS?MethodsTwelve healthy younger adults participated in this study. There were two StandTS conditions. In the reference condition, participants stood in an upright position with their feet positioned shoulder-width apart on the force plate. Upon receiving a visual cue, participants performed StandTS at their preferred speed. In the smooth condition, participants were instructed to perform StandTS as smoothly as possible, aiming to minimize contact pressure on the seat. Lower leg kinetics, kinematics, and coordination patterns of muscle activation during StandTS were measured: (1) angular displacement of the trunk, knee, and hip flexion; (2) knee and hip extensor eccentric work; (3) muscle synergy pattern derived from electromyography (EMG) activity of the leg muscles; and (4) postural sway in the anterior–posterior (A-P), medio-lateral (M-L), and vertical directions.ResultsCompared to the reference condition, the smooth condition demonstrated greater eccentric knee extensor flexion and increased joint work in both the knee and hip joints. Analysis of specific muscle synergy from EMG activity revealed a significant increase in the relative contribution of hip joint muscles during the smooth condition. Additionally, a negative correlation was observed between knee extensor and vertical postural sway, as well as hip extensor work and M-L postural sway.ConclusionSmooth StandTS facilitates enhanced knee eccentric control and increased joint work at both the hip and knee joints, along with increased involvement of hip joint muscles to effectively manage falling momentum during StandTS. Furthermore, the increased contributions of knee and hip joint work reduced postural sway in the vertical and M-L directions, respectively. These findings provide valuable insights for the development of targeted StandTS rehabilitation training.

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Section: Discussionmentioning

confidence: 97%

The influence of smoothness and speed of stand-to-sit movement on joint kinematics, kinetics, and muscle activation patterns

Jeon,

Dong,

Dalby

et al. 2024

Front. Hum. Neurosci.

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“…The turning phase entails the body translating and rotating in the new direction of travel, while maintaining dynamic stability [39]. From standing to sitting, trunk exion and knee exion are almost synchronized, requiring control of the whole body's center of gravity to achieve anterior-posterior and vertical displacement [40]. We merged the second turning and sitting phases into the turn-to-sit phase because older adults typically perform both movements simultaneously.…”

Section: General Considerationsmentioning

confidence: 99%

Identifying Sensors-based Parameters Associated with Fall Risk in Community-Dwelling Older Adults: An Investigation and Interpretation of Discriminatory Parameters

Wang

Cao

Zhao

et al. 2023

Preprint

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Background Falls pose a severe threat to the health of older adults worldwide. Determining gait and kinematic parameters that are related to an increased risk of falls is essential for developing effective intervention and fall prevention strategies. This study aimed to investigate the discriminatory parameter, which lay an important basis for developing effective clinical screening tools for identifying high-fall-risk older adults.Methods Forty-one individuals aged 65 years and above living in the community participated in this study. The older adults were classified as high-fall-risk and low-fall-risk individuals based on their BBS scores. The participants wore an inertial measurement unit (IMU) while conducting the Timed Up and Go (TUG) test. Simultaneously, a depth camera acquired images of the participants' movements during the experiment. After segmenting the data according to subtasks, 142 parameters were extracted from the sensor-based data. A t-test or Mann-Whitney U test was performed on the parameters for distinguishing older adults at high risk of falling. Multiple logistic regression was used to further quantify the role of different parameters in identifying high-fall-risk individuals.Results Fifteen participants were defined as high-fall-risk individuals, while twenty-six were defined as low-fall-risk individuals. 17 parameters were tested for significance with p-values less than 0.05. Multiple logistic regressions were constructed for the parameters with the p-values less than 0.005, including the coefficient of variation of the angular velocity in pitch (CV-Ang-Pitch) during the turn, usage of walking assistance, and the max and coefficient of variation of the angular velocity in yaw (Max-Ang-Yaw, CV-Ang-Yaw) during turn-to-sit. The results showed that the CV-Ang-Pitch during the turn was the parameter with the greatest effect on identifying high-fall-risk individuals.Conclusions High-fall-risk individuals typically exhibited a cautious gait, such as larger step width and shorter step length during walking. Besides, we identified some abnormal gait patterns of high-fall-risk individuals compared to low-fall-risk individuals, such as greater knee angle and a tendency to tilt the pelvis forward during turning. These findings provide insight into the mechanisms underlying the activities of high-fall-risk individuals compared to normal individuals and illustrate the role of sensors in identifying high-fall-risk individuals among community-dwelling older adults. (350 words)

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“…To evaluate the effect of movement duration on hip-knee, hip-ankle, and knee-ankle inter-joint coordination during Si-St and St-Si tasks, the stroke group was further divided into two groups based on the Si-St and St-Si duration characteristics reported in previous studies (4,24,31) and combined with the time recorded in our study, as follows:…”

Section: Participantsmentioning

confidence: 99%

Analysis of inter-joint coordination during the sit-to-stand and stand-to-sit tasks in stroke patients with hemiplegia

Hou

et al. 2023

Preprint

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Background Inter-joint coordination is an important factor affecting postural stability, and its variability increases after fatigue. This study aimed to investigate the coordination pattern of lower limb joints during the sit-to-stand (Si-St) and stand-to-sit (St-Si) tasks in stroke patients and explore the influence of duration on inter-joint coordination. Methods Thirteen stroke hemiplegia patients (five with left paretic and eight right paretic) and thirteen age-matched healthy subjects were recruited. The Si-St and St-Si tasks were performed while each subject’s joint kinematics were recorded using a three-dimensional motion capture system. Sagittal joint angles of the bilateral hip, knee and ankle joints as well as the movement duration were extracted. The angle-angle diagrams for the hip-knee, hip-ankle and knee-ankle joint were plotted to assess the inter-joint coordination. The inter-joint coordination was quantified using geometric characteristics of the angle-angle diagrams, including perimeter, area and dimensionless ratio. The coefficient of variation (CV) was performed to compare variability of the coordination parameters. Results There were no significant differences in the perimeter, area and dimensionless ratio values of the bilateral hip-knee, hip-ankle and knee-ankle inter-joints during Si-St and St-Si tasks in the stroke group. The perimeter values of bilateral hip-knee and knee-ankle inter-joints in the stroke group were lower (P<0.05) than in the healthy group during Si-St and St-Si tasks. Although no significant bilateral differences were found, the inter-joint coordination in stroke patients decreased with the increased movement duration of both Si-St and St-Si tasks. Additionally, the CV of the hip-knee inter-joint area during the Si-St task in the stroke group was less than (P<0.05) that in the healthy group. Conclusion Stroke patients exhibit different inter-joint coordination patterns than healthy controls during the Si-St and St-Si tasks. The duration affects joint coordination, and inter-joint coordination is limited on the hemiplegic side joint pairs, which may lead to inconsistency in the rhythm of the left and right leg inter-joint movements and increase the risk of falls. These findings provide new insights into motor control rehabilitation strategies and may help planning targeted interventions for stoke patients with hemiplegia.

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Comparison of the Lower Extremity Kinematics and Center of Mass Variations in Sit-to-Stand and Stand-to-Sit Movements of Older Fallers and Nonfallers

Cited by 9 publications

References 34 publications

The influence of smoothness and speed of stand-to-sit movement on joint kinematics, kinetics, and muscle activation patterns

The influence of smoothness and speed of stand-to-sit movement on joint kinematics, kinetics, and muscle activation patterns

Identifying Sensors-based Parameters Associated with Fall Risk in Community-Dwelling Older Adults: An Investigation and Interpretation of Discriminatory Parameters

Analysis of inter-joint coordination during the sit-to-stand and stand-to-sit tasks in stroke patients with hemiplegia

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