کنترل شیمیایی تهویۀ ریوی در فعالیت کوتاه‌مدت منقطع و دورۀ بازیافت

افرونده, رقیه; سیاه کوهیان, معرفت; بلبلی, لطفعلی; شمسی, رضوان

doi:10.52547/joeppa.13.2.57

کنترل شیمیایی تهویۀ ریوی در فعالیت کوتاه‌مدت منقطع و دورۀ بازیافت

نوع مقاله : علمی - پژوهشی

نویسندگان

دانشکدۀ علوم تربیتی و روانشناسی دانشگاه محقق اردبیلی، اردبیل، ایران

10.52547/joeppa.13.2.57

چکیده

هدف: فشار دی‌اکسید کربن خون سرخرگی (PaCO₂) از عوامل مهم در سازوکار شیمیایی کنترل تهویۀ ریوی (VE) است که تأثیر مستقیم یا غیرمستقیم یا بی‌تأثیر بودن آن هنوز مورد بحث است. هدف تحقیق حاضر بررسی تأثیر PaCO₂ بر VE طی فعالیت منقطع کوتاه‌مدت و بازیافت پس ‌از این فعالیت و همچنین بررسی تأخیر زمانی در تحریک VE به‌وسیلۀ PaCO₂ بود.
روشها: ده آزمودنی مرد غیرفعال یک فعالیت منقطع کوتاه‌مدت (10ثانیه) با فشار کاری 200 وات را انجام دادند که شرایطی را به‌وجود می‌آورد که در آن از بین تمام عوامل شیمیایی تنها PaCO₂ تغییر می‌کند. تهویۀ ریوی و گازهای تبادل تنفسی در طول مدت استراحت، گرم کردن، تمرین و دورۀ بازیافت اندازه‌گیری شد. PaCO₂با استفاده از PETCO₂ و حجم جاری پیش‌بینی شد. همبستگی عرضی برای نشان دادن ضریب همبستگی بین VE و PaCO₂ پیش‌بینی‌شده با درنظر گرفتن تأخیرهای زمانی مختلف به‌دست آمد.
نتایج: میزانPaCO₂ پیش‌بینی‌شده از ثانیۀ 14 تا 28 دورۀ بازیافت و میزان VE از ثانیۀ 14 تا 90 دورۀ بازیافت به‌طور معنا‌داری بالاتر از میزان آن‌ها در زمان گرم کردن بود (05/0>p) و بالاترین ضریب همبستگی بین PaCO₂ و VE با تأخیر زمانی 7 ثانیه به‌دست آمد (854/0=r).
نتیجه‌گیری: نتایج نشان داد که در مردان غیرفعال طی فعالیت منقطع کوتاه‌مدت و بازیافت پس ‌از آن،PaCO₂ موجب تحریک VE می‌شود و تأخیر زمانی 7 ثانیه در تحریک VE به‌وسیلۀPaCO₂ وجود دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Chemical control of pulmonary ventilation during short-term intermittent activity and recovery

نویسندگان [English]

Roghayyeh Afroundeh
Marefat Siahkouhian
Lotfali Bolboli
Rezvan Shamsi

Department of Physical Education and sport Sciences, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran

چکیده [English]

Purpose: Arterial CO₂ pressure (PaCO₂) is one of important factors in Chemical mechanism of ventilation (VE) control that its direct or indirect effect on VE or its lack of influence is still under discussion. The purpose of the present study was to investigate the effect of PaCO₂on VE during short-term intermittent activity and during recovery after this activity and to investigate time lag in stimulation of VE by PaCO₂. Methods: Ten inactive male subjects performed a short-term intermittent activity (10 sec) with work load of 200 watts that induces condition in which only PaCO₂among all chemical factors is changed. VE and gas exchange data were measured continuously during rest, warming up, activity and recovery periods. PaCO₂ was predicted from PETCO₂ and tidal volume (V_T). Cross correlation was obtained for showing correlation coefficient between VE and predicted PaCO₂considering various time lags. Results: The amount of Predicted PaCO₂ was significantly higher than warming up levels from 14 sec to 28 sec during recovery and the amount of VE was significantly higher than warming up levels from 14 sec to 90 sec during recovery (p < 0.05) and the highest correlation coefficient between VE and predicted PaCO₂was obtained in time lag of 7s (r=0.854). Conclusion: The results of this study indicate that in inactive males PaCO₂ stimulate VE during short-term intermittent activity and during recovery after that and there is a time lag of 7 sec in stimulation of VE by PaCO₂.

کلیدواژه‌ها [English]

Arterial CO2 pressure
End tidal CO2 pressure
Pulmonary ventilation
Short-term activity

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