بررسی فرکانس پایه، شدت صدا، جیتر و شیمر واکه /a/ در وضعیت‌های مختلف سر و گردن در افراد سالم: یک مطالعه مقایسه‌ای مقطعی

نوع مقاله : مقاله پژوهشی اصیل

نویسندگان
1 مربی، گروه گفتار درمانی، دانشکده علوم توان‌بخشی، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران
2 کارشناس ارشد، گروه گفتار درمانی، دانشکده علوم توان‌بخشی، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران
3 استاد، گروه ارتوز و پروتز، دانشکده علوم توان‌بخشی، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران
10.48305/jrrs.2026.46959.1172
چکیده
مقدمه: هدف از انجام پژوهش حاضر، بررسی تأثیر وضعیت سر و گردن بر ویژگی‌های آکوستیکی مانند فرکانس پایه، شدت صدا، آشفتگی دامنه و آشفتگی فرکانس واکه‌ /a/ بود.
مواد و روش‌ها: در این مطالعه توصیفی- تحلیلی- مقطعی، 33 نفر به روش نمونه‌گیری در دسترس مورد بررسی قرار گرفتند و از آن‌ها درخواست شد که صدای /a/ را در سه موقعیت وضعیت سر در راستای تنه (طبیعی)، سر رو به جلو (خمیده) و سر کشیده به عقب (کشیده) در حالت نشسته بکشند. میانگین فرکانس پایه، آشفتگی فرکانس، شدت صدا و آشفتگی دامنه به وسیله نرم‌افزار Praat استخراج گردید و سپس با استفاده از آزمون ANOVA و آزمون تعقیبی Least significant difference (LSD) مورد تجزیه و تحلیل قرار گرفت.
یافته‌ها: تفاوت معنی‌داری در میانگین فرکانس پایه بین دو موقعیت خمیده و کشیده سر (۰۲۴/۰ = P) و دو موقعیت خمیده و طبیعی سر (۰۴/۰ = P) در زنان مشاهده گردید. شدت صدا در مردان بین دو موقعیت خمیده و کشیده سر (۰۰۵/۰ = P) و دو موقعیت طبیعی و خمیده سر (۰۰۶/۰ = P) معنی‌دار بود. میانگین آشفتگی فرکانس پایه در سه موقعیت سر، نه در زنان (۹۰۷/۰ = P) و نه مردان (۷۹۵/۰ = P) معنی‌دار نبود. در مردان تفاوت معنی‌داری در میانگین آشفتگی دامنه بین دو موقعیت طبیعی و کشیده سر (۰۲۲/۰ = P) و دو موقعیت طبیعی و خمیده سر ( ۰۱۳/۰ = P) وجود داشت.
نتیجه‎گیری: می‌توان نتیجه گرفت که بهترین موقعیت برای صداسازی، هم‌راستا بودن سر و گردن، تنه و لگن می‌باشد و هر تغییری در این وضعیت می‌تواند بر شاخص‌های آکوستیک تأثیر بگذارد. اگرچه برخی شاخص‌ها در تحقیق حاضر تفاوت معنی‌داری را نشان ندادند، این یافته‌ها می‌توانند از نظر بالینی به ‌ویژه در کاربران حرفه‌ای صدا حایز اهمیت باشد.
کلیدواژه‌ها
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