An Examination of Heart Rate Variability at Anaerobic Threshold and Respiratory Compensation Points During Cardiopulmonary Exercise Test

Abstract

The aim of this study is to examine the changes in HRV values before, during (at AT and RC) and after maximal incremental cardiopulmonary exercise test. The sample comprised 121 healthy men who recreational do exercise 2-3 days a week. (age: 30.5 ± 4.6 years, height: 177.8 ± 6.1 cm; weight: 80.2 ± 10.2 kg). Anthropometric measurements were measured by using body analyzer, and aerobic capacities of participants were measured by using the cardiopulmonary exercise test via the Bruce protocol. According to this, heart rate variability recordings were taken at seven stages during the cardiopulmonary exercise test: before the test (1), at the beginning of the test (2), between the beginning of the test and the anaerobic threshold (3), at the anaerobic threshold (4), between the anaerobic threshold and the respiratory threshold (5), at the respiratory threshold (6), and finally (7), 30 seconds after the cardiopulmonary exercise test. Repeated measures analysis of variance (ANOVA) was used to compare the HRV values obtained from the test stages. In conclusion, using a gas analyzer during cardiovascular exercise testing, HRV values (MeanRR, SDNN, RMSSD, LFnu) determined at seven stages continue to decrease from the beginning. A rest period of 30 seconds (passive rest) immediately after completing the exercise does not seem to be sufficient for recovery. According to the results of this study, it can be considered that the sympathetic nervous system activity (LFnu) exhibits a more pronounced appearance at threshold zones.

Keywords

• Autonomic nervous system
• Aerobic capacity
• Heart rate variability

Kardiyopulmoner Egzersiz Testi̇ Sırasında Anaerobik Eşik ve Solunum Kompenzasyonunun Kalp Atım Hızı Değişkenliği̇ Açısından İncelenmesi̇

Öz

Bu çalışmanın amacı, maksimal artan kardiyo-pulmoner egzersiz testi öncesi, sırasında (AT ve RC'de) ve sonrasında HRV değerlerindeki değişiklikleri incelemektir. Örneklem, haftada 2-3 gün rekreaktif olarak egzersiz yapan 121 sağlıklı erkekten oluştu (Yaş 30,5 ± 4,6 yıl; Boy 177,8 ± 6,1 cm; Ağırlık 80,2 ± 10,2 kg). Antropometrik ölçümler vücut analiz cihazı kullanılarak, aerobik kapasiteleri Bruce protokolü kullanılarak kardiyo-pulmoner egzersiz testi ile ölçüldü. Buna göre kardiyo-pulmoner egzersiz testi öncesinde (1), test başlangıcında (2), test başlangıcı ile anaerobik eşik arasında (3), anaerobik eşikte (4), anaerobik eşik ile solunum eşiği arasında (5), solunum eşiğinde (6) ve son olarak kardiyo-pulmoner egzersiz testi sonrasında (7) 30’ar saniye olmak üzere yedi aşamada kalp hızı değişkenliği kayıtları alındı. Test aşamalarından elde edilen HRV değerlerini karşılaştırmak için tekrarlı ölçümler varyans analizi (ANOVA) kullanıldı. Sonuç olarak, kardiyovasküler egzersiz testi sırasında gaz analizörü kullanılarak yedi aşamada belirlenen HRV değerleri (MeanRR, SDNN, RMSSD, LFnu) başlangıçtan itibaren azalmaya devam etmektedir. Egzersizi tamamladıktan hemen sonra 30 saniyelik bir dinlenme süresi (pasif dinlenme) toparlanma için yeterli görünmemektedir. Bu çalışmanın sonuçlarına göre sempatik sinir sistemi aktivitesinin (LFnu) eşik bölgelerinde daha belirgin bir görünüm sergilediği düşünülebilir.

Anahtar Kelimeler

• Otonomik sinir sistemi
• Aerobik kapasite
• Kalp atım hızı değişkenliği

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