{"id":8225,"date":"2026-10-01T21:24:52","date_gmt":"2026-10-01T19:24:52","guid":{"rendered":"https:\/\/blueportance.com\/knowledge-base\/expert-guides\/living-flows\/continuous-flow-organization\/immobility-prolonged-holding-variability\/"},"modified":"2026-10-25T22:44:07","modified_gmt":"2026-10-25T21:44:07","slug":"immobility-prolonged-holding-variability","status":"publish","type":"page","link":"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/living-flows\/continuous-flow-organization\/immobility-prolonged-holding-variability\/","title":{"rendered":"KB 3_Expert Guide_02_Living Flows_01_Continuous-Flow Organization_10_Immobility and Prolonged Holding: When the Variability of Mechanical Conditions Decreases"},"content":{"rendered":"\n\n<!-- BDC \u2014 Continuous-Flow Organization - A10_Immobility and Prolonged Holding: When the Variability of Mechanical Conditions Decreases \u2014 Blue Portance -->\n\n<style>\n    .bp-bdc-breadcrumb{\n      max-width: 900px;\n      margin: 0 auto;\n      padding: 20px 16px 0;\n      font-size: .85rem;\n      color: #6b7280;\n    }\n    .bp-bdc-breadcrumb a{\n      color: #2a7fba;\n      text-decoration: none;\n    }\n    .bp-bdc-breadcrumb a:hover{\n      text-decoration: underline;\n    }\n\n  .bp-figure {\n      margin: 40px auto;\n      text-align: center;\n      max-width: 760px;\n  }\n\n  .bp-figure img {\n      display: block;\n      margin: 0 auto;\n      max-width: 100%;\n      height: auto;\n      border-radius: 8px;\n  }\n\n  .bp-figure figcaption {\n      margin: 10px auto 0;\n      max-width: 650px;\n      text-align: center;\n      color: #666;\n      font-size: 0.85em;\n      line-height: 1.45;\n  }\n\n  .bp-fig-title {\n      display: block;\n      margin: 0 0 4px;\n      padding: 0;\n      font-style: normal;\n      font-weight: 700;\n      font-size: 1em;\n      color: #333;\n      line-height: 1.3;\n  }\n\n  .bp-fig-text {\n      display: block;\n      margin: 0;\n      padding: 0;\n      font-style: italic;\n  }\n  \n    .bp-bdc-navigation a::before{content:\"\u2190 \";}\n  <\/style>\n\n<nav class=\"bp-bdc-breadcrumb\" aria-label=\"Breadcrumb\">\n  <a href=\"\/en\/\">Blue Portance<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/\">Knowledge Base<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/\">Expert Guides<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/living-flows\/\">Living Flows<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/living-flows\/continuous-flow-organization\/\">Continuous-Flow Organization<\/a> \u2192 Immobility and Prolonged Holding\n<\/nav>\n\n\n\n\n<section class=\"bp-bdc-wrap\">\n\n  <header class=\"bp-bdc-hero\">\n    <h1>10. Immobility and Prolonged Holding: When the Variability of Mechanical Conditions Decreases<\/h1>\n    <p>Knowledge Base \u2013 Expert Guide: Continuous-Flow Organization<\/p>\n    <div class=\"bp-bdc-meta\">Blue Portance Knowledge Base \u00b7 Non-commercial reproduction permitted with source attribution<\/div>\n  <\/header>\n\n  <p>\n    The human body can remain relatively still while staying active. Indeed, even when posture appears\n    motionless, breathing, cardiac activity, muscle tone, microvascular exchange and the\n    adjustments of the nervous system continue.\n  <\/p>\n\n  <div class=\"bp-box bp-box--info\">\n    <p>\n      <strong>In this article, we use the term &#8220;functional immobility&#8221; when repositioning is absent,\n      infrequent or insufficient to actually change the loaded areas.<\/strong>\n    <\/p>\n  <\/div>\n\n  <p>\n    However, this definition does not mean that internal movements stop. Instead, it describes a reduction in\n    changes of posture, configuration and support.\n  <\/p>\n\n  <div class=\"bp-box bp-box--info\">\n    <p>\n      <strong>When the same posture is held for a long time, the variability of stresses, deformations\n      and support areas may decrease. As a result, prolonging these mechanical conditions may locally alter\n      interstitial pressures, fluid movement and certain indicators of perfusion or tissue\n      recovery, depending on the duration of loading, the individual&#8217;s characteristics and their capacity\n      to reposition.<\/strong>\n    <\/p>\n  <\/div>\n\n  <p>\n    The point, then, is not simply to set movement against immobility. Rather, it is to understand what\n    happens when certain mechanical conditions remain unchanged for a long time.\n  <\/p>\n\n  <nav class=\"bp-bdc-toc\" aria-label=\"Contents\">\n    <h2>Contents<\/h2>\n    <ul>\n      <li><a href=\"#distinction-notions\">1. Postural Balance, Prolonged Holding and Functional Immobility<\/a><\/li>\n      <li><a href=\"#regimes-equilibre\">2. Static Sitting, Stable Dynamic Sitting and Unstable Dynamic Sitting<\/a><\/li>\n      <li><a href=\"#configuration-maintenue\">3. A Sustained Mechanical Configuration<\/a><\/li>\n      <li><a href=\"#duree-facteur-mecanique\">4. Duration as a Mechanical Factor<\/a><\/li>\n      <li><a href=\"#pression-deformation-perfusion\">5. Pressure, Deformation and Perfusion<\/a><\/li>\n      <li><a href=\"#variabilite-appuis-diminue\">6. When Variability of Support Decreases<\/a><\/li>\n      <li><a href=\"#chaleur-humidite-inconfort\">7. Heat, Moisture and Discomfort<\/a><\/li>\n      <li><a href=\"#repositionnement-litterature\">8. Repositioning and the Pressure Injury Literature<\/a><\/li>\n      <li><a href=\"#facteurs-individuels-vulnerabilite\">9. Individual Factors and Vulnerability<\/a><\/li>\n      <li><a href=\"#meme-pression-effet-different\">10. The Same Pressure Does Not Always Produce the Same Effect<\/a><\/li>\n      <li><a href=\"#assise-implications\">11. What This Means for Sitting<\/a><\/li>\n      <li><a href=\"#niveaux-interpretation\">12. The Four Levels of Interpretation<\/a><\/li>\n      <li><a href=\"#retenir\">13. Key Takeaways<\/a><\/li>\n      <li><a href=\"#references\">Scientific References<\/a><\/li>\n    <\/ul>\n  <\/nav>\n\n  <article class=\"bp-bdc-content\">\n\n  <section id=\"distinction-notions\">\n  <h2>1. Postural Balance, Prolonged Holding and Functional Immobility<\/h2>\n\n  <p>\n    These three notions need to be distinguished.\n  <\/p>\n\n  <div class=\"bp-box bp-box--info\">\n    <ul>\n      <li><strong>Postural balance<\/strong> \u2014 A state continuously regulated by bodily adjustments and, on a static seat, by the successive search for postures and support bridges.<\/li>\n      <li><strong>Prolonged holding<\/strong> \u2014 The same posture kept for a certain length of time.<\/li>\n      <li><strong>Functional immobility<\/strong> \u2014 Repositioning that is absent, infrequent or insufficient to\n      actually change the loaded areas.<\/li>\n    <\/ul>\n  <\/div>\n\n  <p>\n    Postural balance can be found momentarily without being sustainable over time. For example, on a static\n    seat, a person may tilt the trunk, move the pelvis or create new support bridges\n    to regain balance. However, these adaptations only truly change the loaded areas\n    if they produce a sufficient change in the support configuration: flexing the trunk may\n    alter the intensity or direction of stresses while keeping the load on the same\n    main region.\n  <\/p>\n\n  <p>\n    Conversely, a posture that seems to involve little stress can become more demanding when it is\n    held without sufficient opportunity to change it.\n  <\/p>\n\n  <p>\n    The problem, therefore, lies not in momentarily seeking balance, but in prolonging\n    the configuration needed to maintain it.\n  <\/p>\n\n  <\/section>\n\n  <figure class=\"bp-figure\">\n    <img decoding=\"async\"\n      src=\"https:\/\/blueportance.com\/wp-content\/uploads\/flux-a10-1-apparent-movement-and-effective-renewal-of-mechanical-conditions.png\"\n      alt=\"Three seated situations comparing the holding of the same loaded areas, the effective renewal of support with Aporia, and movements insufficient to actually change the loaded areas\"\n      class=\"bp-figure-image\"\n      loading=\"lazy\"\n    >\n\n    <figcaption class=\"bp-figure-caption\">\n      <span class=\"bp-fig-title\">\n        Figure 1 \u2014 Apparent movement and effective renewal of mechanical conditions\n      <\/span>\n\n      <span class=\"bp-fig-text\">\n        The presence of movement does not guarantee that mechanical conditions are renewed: adjustments must actually change the support areas, stresses and local deformations. \u00a9 Blue Portance 2026.\n      <\/span>\n    <\/figcaption>\n  <\/figure>\n\n  <section id=\"regimes-equilibre\">\n  <h2>2. Static Sitting, Stable Dynamic Sitting and Unstable Dynamic Sitting<\/h2>\n\n  <div class=\"bp-box bp-box--info\">\n    <p>\n      <strong>Blue Portance&#8217;s SBNFA\u2122 framework distinguishes three balance regimes in the seated position.\n      Static sitting imposes a succession of precarious balance states that cannot be sustained over time. In contrast, stable\n      dynamic sitting \u2014 in the Aporia\u00ae sense \u2014 makes several controllable balance configurations accessible\n      within a cone of balance, while preserving the independent mobility of the right and left regulators\n      of human balance: the hips and the ankles. It becomes unstable as soon as it\n      immobilizes or locks these regulators together, preventing their differentiated adjustments.<\/strong>\n    <\/p>\n  <\/div>\n\n  <p>\n    On a static seat, a person has only one support geometry available. They must therefore\n    find successive balance states on their own: tilting the trunk, resting an elbow on the thigh, leaning\n    forward on the forearms against the desk. These adjustments create temporary &#8220;balance bridges&#8221;\n    \u2014 but each remains precarious and unsustainable over time, because holding it immobilizes a\n    single configuration. The person must therefore continually change posture and support. In fact, except\n    in an exceptional configuration of structural self-stabilization, human postural balance never\n    freezes: it is continuously regulated.\n  <\/p>\n\n  <h3 id=\"stable-and-unstable-dynamic-sitting\">Stable and Unstable Dynamic Sitting<\/h3>\n\n  <p>\n    Stable dynamic sitting \u2014 in the sense of the Aporia\u00ae support \u2014 addresses this limitation differently: it\n    makes several controllable balance configurations accessible within a cone of\n    stability, while preserving the independent mobility of the right and left hips and, when the feet\n    contribute to support, of the right and left ankles. As a result, the individual can shift the pelvis, move\n    from one stabilized configuration to another, then re-center \u2014 without ever being subjected to permanent\n    instability. Thus, what defines this regime is not the presence of movement, but the preservation of these\n    differentiated adjustments.\n  <\/p>\n\n  <p>\n    In contrast, unstable dynamic sitting immobilizes or locks together these same regulators, preventing\n    their differentiated adjustments: it is this criterion, and not the presence or absence of movement of the\n    support, that defines instability in the SBNFA sense. The individual must then constantly compensate for the\n    support&#8217;s movements, which may increase muscular effort and attentional load, without\n    guaranteeing access to several stabilized balance configurations.\n  <\/p>\n\n  <p>\n    Overall, this distinction shapes the rest of the article: the problem is never perceived immobility or\n    apparent movement, but the capacity \u2014 or lack of capacity \u2014 to actually change the support\n    configuration.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"configuration-maintenue\">\n  <h2>3. A Sustained Mechanical Configuration<\/h2>\n\n  <p>\n    When a posture is kept for a long time, certain areas of the body may remain exposed to\n    relatively constant mechanical conditions.\n  <\/p>\n\n  <p>\n    These conditions may involve:\n  <\/p>\n  <ul>\n    <li>interface pressure;<\/li>\n    <li>soft-tissue compression;<\/li>\n    <li>shear;<\/li>\n    <li>deformation of muscle and adipose tissue;<\/li>\n    <li>skin tension;<\/li>\n    <li>interstitial pressure;<\/li>\n    <li>the temporal variability of muscle activity.<\/li>\n  <\/ul>\n\n  <p>\n    Specifically, holding the same configuration for a prolonged period may reduce the temporal variability of muscle\n    activity and prolong the recruitment of certain stabilizing groups. This activity may nonetheless\n    fluctuate and be distributed across several muscles.\n  <\/p>\n\n  <p>\n    Moreover, the body&#8217;s overall load is not enough to describe the situation. For instance, two people of similar weight\n    may show different pressure distributions and internal deformations depending on their\n    anatomy, muscle mass, adipose tissue, posture and contact area.\n  <\/p>\n\n  <p>\n    In addition, biomechanical models show that internal stresses can be heterogeneous, particularly around\n    bony prominences and in deep tissues <span class=\"bp-inline-ref\">(Shoham &amp; Gefen, 2012)<\/span>.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"duree-facteur-mecanique\">\n  <h2>4. Duration as a Mechanical Factor<\/h2>\n\n  <p>\n    Duration of exposure is a key factor in the tissue response.\n  <\/p>\n\n  <p>\n    A briefly applied load may produce transient deformation with partial or\n    complete recovery after unloading. In contrast, a load held for longer may lead to:\n  <\/p>\n  <ul>\n    <li>progressive deformation;<\/li>\n    <li>fluid redistribution;<\/li>\n    <li>stress relaxation;<\/li>\n    <li>a change in local pressure;<\/li>\n    <li>an increase in residual deformation;<\/li>\n    <li>slower recovery.<\/li>\n  <\/ul>\n\n  <p>\n    Indeed, biological tissues exhibit viscoelastic and poroelastic behavior. Their response therefore depends\n    on time, loading rate and their mechanical history.\n  <\/p>\n\n  <p>\n    For example, in twenty healthy older women, Dobos et al. (2015) studied the effects of 90 minutes of loading\n    on several skin areas exposed to pressure injuries. In particular, the authors observed changes in\n    microtopography, elasticity and residual deformation that varied across the regions studied.\n    Under the experimental conditions, however, the measured changes recovered after unloading\n    <span class=\"bp-inline-ref\">(Dobos et al., 2015)<\/span>.\n  <\/p>\n\n  <p>\n    This study does not make it possible to define a universal risk duration. It does show, however, that loading\n    duration can alter the mechanical properties of the skin, and that the response depends on the area involved.\n  <\/p>\n\n  <\/section>\n\n  <figure class=\"bp-figure\">\n    <img decoding=\"async\"\n      src=\"https:\/\/blueportance.com\/wp-content\/uploads\/flux-a10-2-prolonging-a-configuration-from-mechanical-exposure-to-possible-local-effects.png\"\n      alt=\"Chain linking a sustained configuration, prolonged stresses and possible fluid or physiological effects.\"\n      class=\"bp-figure-image\"\n      loading=\"lazy\"\n    >\n\n    <figcaption class=\"bp-figure-caption\">\n      <span class=\"bp-fig-title\">\n        Figure 2 \u2014 Prolonging a configuration: from mechanical exposure to possible local effects\n      <\/span>\n\n      <span class=\"bp-fig-text\">\n        Duration transforms the conditions of exposure, but does not by itself determine their consequences. \u00a9 Blue Portance 2026.\n      <\/span>\n    <\/figcaption>\n  <\/figure>\n\n  <section id=\"pression-deformation-perfusion\">\n  <h2>5. Pressure, Deformation and Perfusion<\/h2>\n\n  <p>\n    Prolonged loading may alter the pressure exerted on tissues and certain local perfusion\n    conditions.\n  <\/p>\n\n  <p>\n    Interface pressure, however, provides only partial information. It measures the relationship between the\n    body and the support, but does not directly indicate:\n  <\/p>\n  <ul>\n    <li>stresses in deep tissues;<\/li>\n    <li>muscle deformation;<\/li>\n    <li>interstitial pressure;<\/li>\n    <li>the perfusion of each layer;<\/li>\n    <li>the state of the cells;<\/li>\n    <li>recovery after unloading.<\/li>\n  <\/ul>\n\n  <p>\n    For instance, Makhsous et al. showed that certain pressure relief maneuvers could alter interface\n    pressure and tissue perfusion, but that a brief relief of pressure did not\n    necessarily guarantee complete and immediate recovery of perfusion\n    <span class=\"bp-inline-ref\">(Makhsous et al., 2007)<\/span>.\n  <\/p>\n\n  <p>\n    This observation therefore requires us to distinguish between:\n  <\/p>\n  <ul>\n    <li>a decrease in measured pressure;<\/li>\n    <li>the recovery of perfusion;<\/li>\n    <li>the mechanical recovery of the tissue;<\/li>\n    <li>the clinical outcome.<\/li>\n  <\/ul>\n\n  <p>\n    Although these phenomena are related, they are not equivalent.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"variabilite-appuis-diminue\">\n  <h2>6. When Variability of Support Decreases<\/h2>\n\n  <p>\n    When holding a posture involves little repositioning, changes in the\n    location, direction and intensity of stresses may decrease.\n  <\/p>\n\n  <p>\n    Specifically, this reduction may involve several dimensions:\n  <\/p>\n  <ul>\n    <li><strong>temporal dimension<\/strong>: the same areas remain loaded for a long time;<\/li>\n    <li><strong>spatial dimension<\/strong>: support areas change little;<\/li>\n    <li><strong>directional dimension<\/strong>: forces remain oriented in a similar way;<\/li>\n    <li><strong>muscular dimension<\/strong>: the temporal variability of activity may decrease while\n    the distribution of load among muscle groups may shift.<\/li>\n  <\/ul>\n\n  <p>\n    This decrease in variability does not eliminate exchange. It may, however, prolong a single\n    configuration of compression or shear.\n  <\/p>\n\n  <p>\n    We should therefore avoid writing that immobility &#8220;stops&#8221; flows. Rather, it may reduce the opportunities\n    to change local mechanical conditions.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"chaleur-humidite-inconfort\">\n  <h2>7. Heat, Moisture and Discomfort<\/h2>\n\n  <p>\n    Prolonged contact between the body and a support may also alter local thermal and\n    humidity conditions.\n  <\/p>\n\n  <p>\n    These conditions depend in particular on:\n  <\/p>\n  <ul>\n    <li>ambient temperature;<\/li>\n    <li>ventilation;<\/li>\n    <li>material properties;<\/li>\n    <li>contact area;<\/li>\n    <li>perspiration;<\/li>\n    <li>duration of exposure;<\/li>\n    <li>the possibility of changing support.<\/li>\n  <\/ul>\n\n  <p>\n    Heat and moisture may contribute to discomfort and alter the mechanical properties of the skin.\n    They are not, however, sufficient to demonstrate a disruption of deep exchange.\n  <\/p>\n\n  <p>\n    Moreover, discomfort, heat, numbness or the need to move may contribute to triggering\n    repositioning. Their presence does not, however, directly measure the mechanical or\n    physiological state of the tissues, and their absence does not rule out prolonged exposure, particularly when\n    sensation is impaired.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"repositionnement-litterature\">\n  <h2>8. Repositioning and the Pressure Injury Literature<\/h2>\n\n  <p>\n    The pressure injury literature documents the extreme consequences of prolonged exposure\n    in particularly vulnerable individuals. It also helps explain certain mechanisms related to\n    duration, deformation and repositioning, but its findings cannot be transferred\n    directly to every seated person.\n  <\/p>\n\n  <p>\n    Repositioning is a standard prevention strategy for people who are vulnerable or\n    unable to change position on their own. A Cochrane review concludes, however, that the available data\n    do not make it possible to determine with certainty an optimal frequency or method applicable to all\n    settings <span class=\"bp-inline-ref\">(Gillespie et al., 2020)<\/span>.\n  <\/p>\n\n  <p>\n    Similarly, another systematic review with meta-analysis reports a reduced incidence of injuries with\n    certain more frequent repositioning protocols, but stresses that the certainty of the evidence\n    remains low <span class=\"bp-inline-ref\">(Avsar et al., 2020)<\/span>.\n  <\/p>\n\n  <p>\n    These findings must therefore be interpreted in context. Specifically, they mainly concern at-risk adults,\n    who often depend on outside assistance to change position.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"facteurs-individuels-vulnerabilite\">\n  <h2>9. Individual Factors and Vulnerability<\/h2>\n\n  <p>\n    The mechanical effects of a sustained posture vary in all individuals. However, the risk of tissue\n    damage becomes particularly significant when these effects combine with sensory, vascular,\n    nutritional or motor vulnerability.\n  <\/p>\n\n  <h3>Factors Influencing the Mechanical Response<\/h3>\n  <ul>\n    <li>anatomy;<\/li>\n    <li>soft-tissue thickness;<\/li>\n    <li>muscle mass;<\/li>\n    <li>posture;<\/li>\n    <li>contact area;<\/li>\n    <li>support geometry;<\/li>\n    <li>material properties;<\/li>\n    <li>shear.<\/li>\n  <\/ul>\n\n  <h3>Factors Increasing Vulnerability<\/h3>\n  <ul>\n    <li>reduced sensation;<\/li>\n    <li>impaired blood supply;<\/li>\n    <li>persistent moisture;<\/li>\n    <li>poor nutritional status;<\/li>\n    <li>a history of injury;<\/li>\n    <li>reduced mobility;<\/li>\n    <li>inability to reposition;<\/li>\n    <li>certain medical conditions or treatments.<\/li>\n  <\/ul>\n\n  <p>\n    This distinction thus avoids implicitly applying the pressure injury literature to every\n    seated person in the same terms.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"meme-pression-effet-different\">\n  <h2>10. The Same Pressure Does Not Always Produce the Same Effect<\/h2>\n\n  <p>\n    The relationship between interface pressure and tissue response is not linear.\n  <\/p>\n\n  <p>\n    In other words, the same pressure may produce different effects depending on:\n  <\/p>\n  <ul>\n    <li>duration;<\/li>\n    <li>the tissue involved;<\/li>\n    <li>the support surface;<\/li>\n    <li>associated shear;<\/li>\n    <li>tissue deformability;<\/li>\n    <li>baseline perfusion;<\/li>\n    <li>recovery capacity;<\/li>\n    <li>the person&#8217;s sensation.<\/li>\n  <\/ul>\n\n  <p>\n    For example, in an exploratory MRI study of six participants and six wheelchair cushions,\n    Brienza et al. (2018) observed that three-dimensional tissue deformation depended on both\n    the participant&#8217;s anatomy and the cushion tested. In particular, none of the cushions evaluated produced the lowest\n    deformation in all participants\n    <span class=\"bp-inline-ref\">(Brienza et al., 2018)<\/span>.\n  <\/p>\n\n  <p>\n    While this study supports the importance of individualization, its small sample calls for caution.\n  <\/p>\n\n  <p>\n    Evaluating a seat therefore cannot rely on interface pressure alone. Depending on the clinical\n    or experimental context, it may take several complementary indicators into account:\n  <\/p>\n  <ul>\n    <li>in practice: support distribution, comfort, stability and capacity to reposition;<\/li>\n    <li>in research or in a specialized setting: internal deformation, perfusion and oxygenation.<\/li>\n  <\/ul>\n\n  <\/section>\n\n  <figure class=\"bp-figure\">\n    <img decoding=\"async\"\n      src=\"https:\/\/blueportance.com\/wp-content\/uploads\/flux-a10-3-comparable-pressure-does-not-necessarily-produce-the-same-tissue-deformation.png\"\n      alt=\"Two tissue cross-sections subjected to comparable pressure but showing different internal deformations.\"\n      class=\"bp-figure-image\"\n      loading=\"lazy\"\n    >\n\n    <figcaption class=\"bp-figure-caption\">\n      <span class=\"bp-fig-title\">\n        Figure 3 \u2014 Comparable pressure does not necessarily produce the same tissue deformation\n      <\/span>\n\n      <span class=\"bp-fig-text\">\n        Interface pressure alone does not reveal internal deformation or tissue vulnerability. \u00a9 Blue Portance 2026.\n      <\/span>\n    <\/figcaption>\n  <\/figure>\n\n  <section id=\"assise-implications\">\n  <h2>11. What This Means for Sitting<\/h2>\n\n  <p>\n    First, prolonged sitting should not be presented as a general interruption of bodily\n    flows.\n  <\/p>\n\n  <p>\n    It may, however, keep certain areas under relatively constant mechanical conditions.\n    Consequently, when opportunities to reposition are limited, the duration of exposure to the same pressure,\n    shear or deformation increases.\n  <\/p>\n\n  <p>\n    On the other hand, changes in configuration may:\n  <\/p>\n  <ul>\n    <li>alter pelvic orientation;<\/li>\n    <li>shift part of the load;<\/li>\n    <li>change the relationship with the backrest;<\/li>\n    <li>reduce certain local compressions;<\/li>\n    <li>shift areas of peak pressure;<\/li>\n    <li>alter the activity of stabilizing muscles.<\/li>\n  <\/ul>\n\n  <p>\n    However, these effects should not be inferred from the mere presence of movement. Instead, in the SBNFA\u2122 framework,\n    one must check whether that movement actually results in a shift of the pelvis, a change in support\n    areas or a significant change in the direction of stresses.\n  <\/p>\n\n  <p>\n    It is therefore preferable to speak of the possibility of <strong>reducing, shifting or temporarily interrupting\n    certain local compressions<\/strong>, rather than claiming that movement always eliminates them.\n  <\/p>\n\n  <div class=\"bp-box bp-box--info\">\n    <strong>Caution<\/strong>\n    <p>\n      In the fifteen young, healthy women studied by Makhsous et al. (2012), the five chair\n      designs tested altered pressure distribution and certain perfusion indicators in the\n      buttock region and thighs. However, the short duration of the trials and the characteristics of this population do not\n      allow these results to be generalized to all people or to all sitting situations\n      <span class=\"bp-inline-ref\">(Makhsous et al., 2012)<\/span>.\n    <\/p>\n  <\/div>\n\n  <p>\n    Finally, the goal is not necessarily to keep the person moving continuously. It is to preserve their\n    ability to change or interrupt a support configuration, in order to reduce the length of time\n    during which the same combination of pressure, deformation and shear is maintained.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"niveaux-interpretation\">\n  <h2>12. The Four Levels of Interpretation<\/h2>\n\n  <div class=\"bp-box bp-box--info\">\n    <ul>\n      <li><strong>Mechanical<\/strong> \u2014 A sustained posture may prolong certain stresses, deformations\n      and support areas.<\/li>\n      <li><strong>Fluid<\/strong> \u2014 Duration and deformation may locally alter pressures and\n      fluid movement.<\/li>\n      <li><strong>Physiological<\/strong> \u2014 These conditions may influence certain indicators of perfusion\n      and tissue recovery.<\/li>\n      <li><strong>Clinical<\/strong> \u2014 Immobility alone cannot predict pain, an\n      injury or a benefit associated with a particular seat.<\/li>\n    <\/ul>\n  <\/div>\n\n  <p>\n    Overall, this grid forms the framework of scientific caution for A10. In particular, it makes it possible to distinguish an observed mechanical\n    condition, a possible physiological effect and a clinical outcome that must be demonstrated\n    separately.\n  <\/p>\n\n  <\/section>\n\n  <section id=\"retenir\">\n  <h2>13. Key Takeaways<\/h2>\n\n  <p>\n    Above all, immobility does not eliminate biological activity. It may, however, reduce the temporal,\n    spatial and directional diversity of the stresses to which certain regions of the body are subjected.\n  <\/p>\n\n  <p>\n    In short, loading duration, deformation, shear, perfusion, tissue properties and the capacity\n    to reposition all act together.\n  <\/p>\n\n  <div class=\"bp-box bp-box--info\">\n    <p>\n      <strong>Holding a posture for a prolonged period does not necessarily block exchange; it may,\n      however, prolong certain mechanical conditions and reduce the opportunities to change support,\n      stresses and local deformations.<\/strong>\n    <\/p>\n  <\/div>\n\n  <h3>Article Summary<\/h3>\n\n  <p>\n    In summary, postural balance found momentarily can become unsustainable when maintaining it prolongs a single\n    mechanical configuration. Certain areas may then remain subjected for long periods to similar pressures,\n    deformations or shear, with effects that depend on duration, tissue\n    characteristics and the person&#8217;s capacity to reposition.\n  <\/p>\n\n  <p>\n    The point, then, is neither to lock the person into a precarious balance nor to impose constant\n    movement on them. Rather, it is to enable them to access several controllable balance configurations and\n    to actually change their support when needed.\n  <\/p>\n\n  <p>\n    A11 will examine how dynamic sitting can seek to restore this controllable variability without\n    imposing permanent instability.\n  <\/p>\n\n  <\/section>\n\n  <hr>\n\n  <section id=\"references\">\n    <div class=\"bp-box bp-box--info\">\n      <h2>Scientific References<\/h2>\n\n      <h3>Mechanical Configuration and Tissue Biomechanics<\/h3>\n      <ol>\n        <li>Shoham, N., &amp; Gefen, A. (2012). Deformations, mechanical strains and stresses across the different hierarchical scales in weight-bearing soft tissues. <em>Journal of Tissue Viability<\/em>, 21(2), 39\u201346. https:\/\/doi.org\/10.1016\/j.jtv.2012.03.001<\/li>\n      <\/ol>\n\n      <h3>Loading Duration and Tissue Response<\/h3>\n      <ol>\n        <li>Brienza, D. M., Vallely, J. J., Karg, P. E., Akins, J. S., &amp; Gefen, A. (2018). An MRI investigation of the effects of user anatomy and wheelchair cushion type on tissue deformation. <em>Journal of Tissue Viability<\/em>, 27(1), 42\u201353. https:\/\/doi.org\/10.1016\/j.jtv.2017.04.001<\/li>\n        <li>Dobos, G., Gefen, A., Blume-Peytavi, U., &amp; Kottner, J. (2015). Weight-bearing-induced changes in the microtopography and structural stiffness of human skin in vivo following immobility periods. <em>Wound Repair and Regeneration<\/em>, 23(1), 37\u201343. https:\/\/doi.org\/10.1111\/wrr.12259<\/li>\n      <\/ol>\n\n      <h3>Sitting, Interface Pressure and Perfusion<\/h3>\n      <ol>\n        <li>Makhsous, M., Priebe, M., Bankard, J., et al. (2007). Measuring tissue perfusion during pressure relief maneuvers: insights into preventing pressure ulcers. <em>The Journal of Spinal Cord Medicine<\/em>, 30(5), 497\u2013507. https:\/\/doi.org\/10.1080\/10790268.2007.11754584<\/li>\n        <li>Makhsous, M., Lin, F., Hanawalt, D., Kruger, S. L., &amp; LaMantia, A. (2012). The effect of chair designs on sitting pressure distribution and tissue perfusion. <em>Human Factors<\/em>, 54(6), 1066\u20131074. https:\/\/doi.org\/10.1177\/0018720812457681<\/li>\n      <\/ol>\n\n      <h3>Repositioning and Pressure Injury Prevention<\/h3>\n      <ol>\n        <li>Avsar, P., Moore, Z. E. H., Patton, D., O&#8217;Connor, T., Budri, A. M., &amp; Nugent, L. (2020). Repositioning for preventing pressure ulcers: a systematic review and meta-analysis. <em>Journal of Wound Care<\/em>, 29(9), 496\u2013508. https:\/\/doi.org\/10.12968\/jowc.2020.29.9.496<\/li>\n        <li>Gillespie, B. M., Walker, R. M., Latimer, S. L., Thalib, L., Whitty, J. A., McInnes, E., &amp; Chaboyer, W. P. (2020). Repositioning for pressure injury prevention in adults. <em>Cochrane Database of Systematic Reviews<\/em>, 6, CD009958. https:\/\/doi.org\/10.1002\/14651858.CD009958.pub3<\/li>\n      <\/ol>\n    <\/div>\n  <\/section>\n\n  <\/article>\n\n  <!-- NAVIGATION -->\n  <nav class=\"bp-bdc-box bp-bdc-navigation\" aria-label=\"Topic navigation\">\n    <strong>Navigation<\/strong>\n    <p>\n      <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/living-flows\/continuous-flow-organization\/\">\n        Back to the Continuous-Flow Organization guide\n      <\/a>\n    <\/p>\n    <p>\n      <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/living-flows\/\">\n        See the topic: Living Flows\n      <\/a>\n    <\/p>\n    <p>\n      <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/\">\n        Explore the Expert Guides section of the Knowledge Base\n      <\/a>\n    <\/p>\n  <\/nav>\n\n  <!-- NOTE -->\n  <footer class=\"bp-bdc-footer\">\n    <strong>Note<\/strong>: this content aims to explain mechanisms.\n    It is neither a medical diagnosis nor a treatment prescription.\n  <\/footer>\n\n  <p class=\"bp-bdc-copyright\" style=\"font-size:.85em;color:#6b7280;margin-top:16px;\">\n    \u00a9 Gil Ayache. The concepts, diagrams, terminology and principles presented on this page are a work\n    protected by copyright. They are made available to Blue Portance under an intellectual property\n    licensing agreement, without transfer of economic rights or authorship.\n  <\/p>\n\n\n<\/section>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Blue Portance \u2192 Knowledge Base \u2192 Expert Guides \u2192 Living Flows \u2192 Continuous-Flow Organization \u2192 Immobility and Prolonged Holding 10. 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