fa بررسی پایداری وضعیتی حین حفظ بار متغیر دینامیکی در وضعیت غیرقرینه تنه در مردان سالم فیزیوتراپی Physiotherapy پژوهشي Research <font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 2.4pt 0pt 0in text-align: justify line-height: normal unicode-bidi: embed direction: rtl text-justify: kashida text-kashida: 0%" dir="rtl"><b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">زمینه و هدف:</span></b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"> تغییرات در میزان نیرو حین حفظ بار غیرقرینه می‌تواند همراه با افزایش خطر به هم خوردن تعادل و آسیب های مهره‌ای باشد؛ بنابراین </span><span lang="AR-SA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt">بررسی پایداری وضعیتی در چنین شرایطی مانند حفظ بار متغیر دینامیکی در وضعیت غیرقرینه تنه</span><span lang="AR-SA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"> </span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">جهت ارزیابی آسیب‌های شغلی و طراحی برنامه‌های پیشگیری و توانبخشی از اهمیت به سزایی برخوردار می‌باشد.<o:p /></span></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 2.4pt 0pt 0in text-align: justify line-height: normal unicode-bidi: embed direction: rtl text-justify: kashida text-kashida: 0%" dir="rtl"><b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">روش کار:</span></b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"> در یک پژوهش مقطعی، دامنه و سرعت نوسان مرکز فشار بدن در 14 مرد سالم حین حفظ بار استاتیک و متغیر دینامیک در وضعیت قرینه و غیرقرینه تنه مورد مطالعه قرار گرفت.<o:p /></span></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 2.4pt 0pt 0in text-align: justify line-height: normal unicode-bidi: embed direction: rtl text-justify: kashida text-kashida: 0%" dir="rtl"><b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">یافته ها:</span></b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"> پاسخ‌های پارامترهای مرکز فشار در جهت قدامی- خلفی به هر دو وضعیت قرینه و غیرقرینه تنه یکسان بود؛ در حالی که این پاسخ در جهت داخلی- خارجی در وضعیت غیرقرینه نسبت به قرینه به طور معنی‌داری بیشتر بود (05/0</span><span style="color: black font-family: "Times New Roman","serif" font-size: 9pt mso-bidi-font-family: "B Mitra" mso-bidi-font-size: 10.0pt mso-bidi-language: FA" dir="ltr">p<</span><span dir="rtl"></span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"><span dir="rtl"></span>).</span><span dir="ltr"></span><span lang="FA" style="color: black font-family: "Times New Roman","serif" font-size: 9pt mso-bidi-font-family: "B Mitra" mso-bidi-font-size: 10.0pt mso-bidi-language: FA" dir="ltr"><span dir="ltr"></span> </span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">حفظ بار متغیر دینامیکی در وضعیت غیرقرینه منجر به افزایش پارامترهای تعادل در هر دو جهت</span><span dir="ltr"></span><span lang="FA" style="color: black font-family: "Times New Roman","serif" font-size: 9pt mso-bidi-font-family: "B Mitra" mso-bidi-font-size: 10.0pt mso-bidi-language: FA" dir="ltr"><span dir="ltr"></span> </span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">داخلی- خارجی و قدامی- خلفی گردید (05/0</span><span style="color: black font-family: "Times New Roman","serif" font-size: 9pt mso-bidi-font-family: "B Mitra" mso-bidi-font-size: 10.0pt mso-bidi-language: FA" dir="ltr">p<</span><span dir="rtl"></span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"><span dir="rtl"></span>)؛ در حالی که در وضعیت قرینه تنها افزایش در جهت قدامی- خلفی مشاهده شد (05/0</span><span style="color: black font-family: "Times New Roman","serif" font-size: 9pt mso-bidi-font-family: "B Mitra" mso-bidi-font-size: 10.0pt mso-bidi-language: FA" dir="ltr">p<</span><span dir="rtl"></span><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"><span dir="rtl"></span>).<o:p /></span></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 2.4pt 0pt 0in text-align: justify line-height: normal unicode-bidi: embed direction: rtl text-justify: kashida text-kashida: 0%" dir="rtl"><b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA">نتیجه گیری:</span></b><span lang="FA" style="color: black font-family: "B Mitra" font-size: 10pt mso-ascii-font-family: "Times New Roman" mso-hansi-font-family: "Times New Roman" mso-ansi-font-size: 9.0pt mso-bidi-language: FA"> نتایج نشان داد که بار متغیر دینامیکی کنترل پایداری وضعیتی فرد را به مخاطره می‌اندازد که این اثر در شرایط غیرقرینه بیشتر می‌گردد.<o:p /></span></p><font face="Times New Roman" size="3"> </font> <font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 0in 0pt text-align: justify line-height: normal text-justify: kashida text-kashida: 0%"><font size="3"><b><span style="font-family: "Times New Roman","serif"">Background</span></b><span style="font-family: "Times New Roman","serif"">: </span><span style="font-family: "Times New Roman","serif" mso-bidi-language: FA">Changes in load during asymmetric holding may be associated with particularly high risk of loss of balance and spinal injury. Therefore, in order to assess occupational lesions and to make preventive rehabilitation programs in such conditions like holding dynamic loads in asymmetric postures could be important. <o:p /></span></font></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 0in 0pt text-align: justify line-height: normal text-justify: kashida text-kashida: 0%"><font size="3"><b><span style="font-family: "Times New Roman","serif"">Methods</span></b><span style="font-family: "Times New Roman","serif"">: <span dir="rtl"></span><span dir="rtl"><span dir="rtl"></span><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span>In a cross-sectional study, </span><span style="font-family: "Times New Roman","serif" mso-bidi-language: FA">COP amplitude and velocity sway were studied in 14 normal male volunteers during holding static and dynamic load in symmetric and asymmetric postures. <o:p /></span></font></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 0in 0pt text-align: justify line-height: normal text-justify: kashida text-kashida: 0%"><font size="3"><b><span style="font-family: "Times New Roman","serif"">Results</span></b><span style="font-family: "Times New Roman","serif"">:<span dir="rtl"></span><span dir="rtl"><span dir="rtl"></span><font face="Times New Roman"> </font></span></span><span style="font-family: "Times New Roman","serif" mso-bidi-language: FA">Similar Anterior-Posterior responses to the postures were seen, although asymmetric postures showed a larger Medial-Lateral COP amplitude and velocity<span dir="rtl"></span><span dir="rtl"><span dir="rtl"></span><font face="Times New Roman"> </font></span>sway (p<0.05). While dynamic load increased Anterior-Posterior and Medial-Lateral postural parameters in asymmetric posture (p<0.05), we observed increase only in Anterior-Posterior direction in symmetric posture (p<0.05).<o:p /></span></font></p><font face="Times New Roman" size="3"> </font><p class="MsoNormal" style="margin: 0in 0in 0pt text-align: justify line-height: normal text-justify: kashida text-kashida: 0%"><font size="3"><b><span style="font-family: "Times New Roman","serif"">Conclusion:<span dir="rtl"></span><span dir="rtl"><span dir="rtl"></span><font face="Times New Roman"> </font></span></span></b><span style="font-family: "Times New Roman","serif" mso-bidi-language: FA">The results showed that dynamic load challenges the postural stability control, with a higher effect in asymmetric posture.<o:p /></span></font></p><font face="Times New Roman" size="3"> </font> پایداری وضعیتی، بار متغیر دینامیکی، وضعیت غیرقرینه تنه. Postural stability, Variable dynamic load, Asymmetric posture. 36 45 http://rjms.iums.ac.ir/browse.php?a_code=A-10-1-1387&slc_lang=fa&sid=1 Soha Bervis سها برویس 3900319475328460022797 3900319475328460022797 No Tarbiat Modares دانشگاه تربیت مدرس Sedighe Kahrizi صدیقه کهریزی 3900319475328460022798 3900319475328460022798 Yes Tarbiat Modares دانشگاه تربیت مدرس Mohammad Parnianpour محمد پرنیان پور 3900319475328460022799 3900319475328460022799 No Sharif Technical University استاد مدعو دانشگاه صنعتی شریف Bahram Mobini بهرام مبینی 3900319475328460022800 3900319475328460022800 No Tehran University of Medical Sciences دانشگاه علوم پزشکی تهران