Influence of base of support on early postural adjustments and fencing lunge performance

2021 ◽  
pp. 1-13
Author(s):  
Anna Akbaş ◽  
Wojciech Marszałek ◽  
Bogdan Bacik ◽  
Grzegorz Juras
Keyword(s):  
Postural Adjustments ◽  
Base Of Support

Balance-corrective responses to unexpected perturbations at the arms during treadmill walking

2014 ◽  
Vol 112 (7) ◽  
pp. 1790-1800 ◽  
Author(s):  
Juan Forero ◽  
John E. Misiaszek
Keyword(s):  
Arm Movements ◽  
Treadmill Walking ◽  
Heel Strike ◽  
Postural Adjustments ◽  
Balance Task ◽  
Base Of Support ◽  
Walking Aid

The arms have been shown to be involved in the regulation of balance during walking. The use of a walking aid enhances balance by increasing the base of support and reducing the load on the legs by partly transferring it to the arms. However, when actively engaged during a balance task, perturbations to the arms can destabilize balance. Previous studies have investigated postural adjustments associated with focal arm movements during standing and walking. However, balance-corrective reactions to unexpected perturbations to the arms during walking have not been well studied. In the present study, subjects walked on a treadmill while grasping a pair of handles when sudden perturbations were delivered by displacing the handles in the forward or backward direction. Instructing subjects to oppose the displacement of the handles resulted in strong responses in the arms that were accompanied by activation of muscles in the legs, comparable to those observed in other balance disturbance studies. Conversely, when subjects were instructed to allow the handles to move when displaced, no responses were observed in the arms. However, similar responses were observed in the legs whether subjects opposed the displacement of the handles or not when perturbations were applied at heel strike. The results from this study show that balance reactions can be elicited in the legs in response to perturbations applied at the arms, and that the expression of these responses is affected by the task engaged in by the arms.

scholarly journals Characterization of Anticipatory Postural Adjustments in Lateral Stepping: Impact of Footwear and Lower Limb Preference

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8244
Author(s):  
Yuri Russo ◽  
Dragan Marinkovic ◽  
Borislav Obradovic ◽  
Giuseppe Vannozzi
Keyword(s):  
Everyday Life ◽  
Lower Limb ◽  
Force Plate ◽  
Motor Task ◽  
Anticipatory Postural Adjustments ◽  
Postural Adjustments ◽  
Spatiotemporal Parameters ◽  
Base Of Support ◽  
Force Plate Data

Lateral stepping is a motor task that is widely used in everyday life to modify the base of support, change direction, and avoid obstacles. Anticipatory Postural Adjustments (APAs) are often analyzed to describe postural preparation prior to forward stepping, however, little is known about lateral stepping. The aim of the study is to characterize APAs preceding lateral steps and to investigate how these are affected by footwear and lower limb preference. Twenty-two healthy young participants performed a lateral step using both their preferred and non-preferred leg in both barefoot and shod conditions. APA spatiotemporal parameters (size, duration, and speed) along both the anteroposterior and mediolateral axes were obtained through force plate data. APAs preceding lateral stepping showed typical patterns both along the anteroposterior and mediolateral axis. RM-ANOVA highlighted a significant effect of footwear only on medio-lateral APAs amplitude (p = 0.008) and velocity (p = 0.037). No differences were found for the limb preference. APAs in lateral stepping presented consistent features in the sagittal component, regardless of limb/shoe factors. Interestingly, the study observed that footwear induced an increase in the medio-lateral APAs size and velocity, highlighting the importance of including this factor when studying lateral stepping.

Evidence for constancy in the modularity of trunk muscle activity preceding reaching: Implications for the role of preparatory postural activity.

2021 ◽  
Author(s):  
Alexander Stamenkovic ◽  
Lena H Ting ◽  
Paul J Stapley
Keyword(s):  
Muscle Activity ◽  
Center Of Mass ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Equilibrium Constraints ◽  
Postural Adjustments ◽  
Postural Activity ◽  
Postural Muscle ◽  
Mass Displacement ◽  
Base Of Support

Postural muscle activity precedes voluntary movements of the upper limbs. The traditional view of this activity is that it anticipates perturbations to balance caused by the movement of a limb. However, findings from reach-based paradigms have shown that postural adjustments can initiate center of mass displacement for mobility, rather than minimize its displacement for stability. Within this context, altering reaching distance beyond the base of support would place increasing constraints on equilibrium during stance. If the underlying composition of anticipatory postural activity is linked to stability, coordination between muscles (i.e., motor modules) may evolve differently as equilibrium constraints increase. We analyzed the composition of motor modules in functional trunk muscles as participants performed multi-directional reaching movements to targets within and beyond arm's length. Bilateral trunk and reaching arm muscle activity were recorded. Despite different trunk requirements necessary for successful movement, and the changing biomechanical (i.e. postural) constraints that accompany alterations in reach distance, Non-negative Matrix Factorization identified functional motor modules derived from preparatory trunk muscle activity that shared common features. Relative similarity in modular weightings (i.e., composition) and spatial activation profiles that reflect movement goals across tasks necessitating differing levels of trunk involvement provides evidence that preparatory postural adjustments are linked to the same task priorities (i.e. movement generation rather than stability).

Possible preventive measures against the spread of COVID-19- A Review article

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 475-481
Author(s):  
Jotheeswari P ◽  
Yuvaraj M ◽  
Balaji K ◽  
Gunapriya Raghunath ◽  
Kumaresan M
Keyword(s):  
Preventive Measures ◽  
Antiviral Drug ◽  
Preventive Measure ◽  
Thought Process ◽  
Precautionary Measure ◽  
Online Tools ◽  
The World ◽  
Base Of Support ◽  
A Current ◽  
Pharmaceutical Interventions

COVID-19 is a current sensational and dangerous threat that affects millions of people across the world. As the day progresses the rate of growth of COVID-19 drastically increases. No vaccine or specific antiviral drug are active against corona, therefore, preventing the exposure to the virus is the base of support against its spread across the world. Despite the implementation of preventive measures, the rate of virus-infected cases progressively increases which stimulates our thought process to raise a question, whether the preventive measures that we follow are effective against the spread of COVID-19 infection. Evidence from previous literature obtained from various online tools implies multiple preventive measures that should be followed and also illustrates their mechanism of action against the active spread of COVID-19 infection. According to the results from the evidence, we can identify the gold standard preventive measure among the described preventive measures. The precautionary measure encompasses both pharmaceutical interventions and non- pharmaceutical interventions among which non-pharmaceutical measures are superior in the prevention of the developing pandemic. Among the non-pharmaceutical interventions, social distancing is the paramount to other measures in the mitigation of the spread of viral infection.

Why Sovereignty Matters Despite Injustice

2018 ◽  
Author(s):  
Richard W. Miller
Keyword(s):  
International Relations ◽  
Large Scale ◽  
Political Community ◽  
Violent Conflict ◽  
Military Interventions ◽  
Support Intervention ◽  
Spheres Of Influence ◽  
Base Of Support ◽  
External Intervention ◽  
Target Country

This chapter argues for greater reluctance to launch humanitarian military interventions, without appealing to any inherent value in sovereignty or autonomous political community. Instead, it appeals to the likely consequences of such intervention—both within the target country and for international relations. Miller considers four types of candidate for intervention: stable tyrannies, unstable tyrannies, popular secessions, and ongoing large-scale killing and displacement. Only in the last of these should we be disposed to support intervention according to Miller, since the likely consequences that plague the other three types are here less challenging. Stable tyrannies are usually maintained because the regime has engineered a wide base of support among elites. External overthrow thus risks unleashing violent conflict between divided groups. In unstable tyrannies internally-driven regime change is preferable. Finally, in popular secession external intervention can stoke Great Power worries about spheres of influence and inspire military build-up.

Postural Adjustments during Interactions with an Active Partner

Neuroscience ◽  
2021 ◽  
Vol 463 ◽  
pp. 14-29
Author(s):  
Matteo Bertucco ◽  
Francesca Nardello ◽  
Riccardo Magris ◽  
Paola Cesari ◽  
Mark L. Latash
Keyword(s):  
Postural Adjustments

Effect of jaw clenching on postural adjustments to a predictable external perturbation

2021 ◽  
Vol 57 ◽  
pp. 102512
Author(s):  
Yosuke Tomita ◽  
Yuto Tanaka ◽  
Kazuki Sako ◽  
Yoshiaki Ono ◽  
Masahiro Tanaka
Keyword(s):  
External Perturbation ◽  
Postural Adjustments
Sign in / Sign up

Export Citation Format

Share Document