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. 2002 Dec 1;1(4):115-21.
eCollection 2002 Dec.

Intra- and inter-observer reliability in selection of the heart rate deflection point during incremental exercise: comparison to a computer-generated deflection point

Daniel G Carey  1 , Robert L Raymond  1 , Bridget A Duoos  1
Affiliations

Intra- and inter-observer reliability in selection of the heart rate deflection point during incremental exercise: comparison to a computer-generated deflection point

Daniel G Carey et al. J Sports Sci Med. .

Abstract
in English, Turkish

This study was designed to 1) determine the relative frequency of occurrence of a heart rate deflection point (HRDP), when compared to a linear relationship, during progressive exercise, 2) measure the reproducibility of a visual assessment of a heart rate deflection point (HRDP), both within and between observers 3) compare visual and computer-assessed deflection points. Subjects consisted of 73 competitive male cyclists with mean age of 31.4 ± 6.3 years, mean height 178.3 ± 4.8 cm. and weight 74.0 ± 4.4 kg. Tests were conducted on an electrically-braked cycle ergometer beginning at 25 watts and progressing 25 watts per minute to fatigue. Heart Rates were recorded the last 10 seconds of each stage and at fatigue. Scatter plots of heart rate versus watts were computer-generated and given to 3 observers on two different occasions. A computer program was developed to assess if data points were best represented by a single line or two lines. The HRDP represented the intersection of the two lines. Results of this study showed that 1) computer-assessed HRDP showed that 44 of 73 subjects (60.3%) had scatter plots best represented by a straight line with no HRDP 2)in those subjects having HRDP, all 3 observers showed significant differences(p = 0.048, p = 0.007, p = 0.001) in reproducibility of their HRDP selection. Differences in HRDP selection were significant for two of the three comparisons between observers (p = 0.002, p = 0.305, p = 0.0003) Computer-generated HRDP was significantly different than visual HRDP for 2 of 3 observers (p = 0.0016, p = 0.513, p = 0.0001). It is concluded that 1) HRDP occurs in a minority of subjects 2) significant differences exist, both within and between observers, in selection of HRDP and 3) differences in agreement between visual and computer-generated HRDP would indicate that, when HRDP exists, it should be computer-assessed.

Bu çalıþma 1) egzersiz ilerledikçe kalp hızı kırılma noktasının (HRDP) doðrusal iliþki ile karþılaþtırıldıðında hangi baðıl sıklıkta oluþtuðunun saptanması, 2) gözlemci ve gözlemci gurubunca kalp hızı kırılma noktasının (HRDP) görsel belirlenmesinin tekrarlanabilirliðinin ölçülmesi 3) görsel ve bilgisayarca belirlenen kırılma noktalarının karþılaþtırılması için yapılmıþtır. Erkek bisiklet yarıþçısı olan 73 deneðin ortalama yaþı 31.4 ± 6.3 yıl, boyu 178.3 ± 4.8 kg. ve aðırlıðı 74.0 ± 4.4kg.. Testler elektrikli fren sistemi olan bisiklet ergometresinde 25 vat yük ile baþlanarak yoruluncaya kadar her dakika direncin 25 vat arttırılması ile yapılmıþtır. Kalp hızları her aþamanın son 10 saniyesinde ve yorgunluk noktasında kaydedilmiþtir. Bilgisayarda kalp hızının yüke karþı yapılan daðılım nokta grafikleri iki farklı oturumda 3 gözlemciye incelettirilmiþtir. Elde edilen sonuçların bir veya iki çizgili modelden hangisi ile daha iyi gösterilebildiðini belirlemek için bir bilgisayar programı geliþtirilmiþtir. Ýki çizgili modelde HRDP kesiþme noktasını temsil etmektedir. Bu çalıþmanın sonuçlarında: 1) 73 denekten 44'ünde (% 60.3) bilgisayarla belirlenen HRDP nokta grafikte düz bir çizgi ile - HRDP olmadan daha iyi sonuçlar vermiþtir. 2) HRDP saptanan deneklerde, her 3 gözlemcide HRDP seçimlerinin tekrarlanabilirliðinde de önemli farklılıklar (p = 0.048, p = 0.007, p = 0.001) sergilemiþlerdir. Gözlemciler arasında HRDP belirlenmesindeki farklılıklar üç karþılaþtırmanın ikisinde önemlidir (p = 0.002, p = 0.305, p = 0.0003). 3) Bilgisayarla belirlenen HRDP üç gözlemciden ikisinde görsel saptanan HRDP'den önemli olarak farklıdır (p = 0.0016, p = 0.513, p = 0.0001). Bu sonuçların ıþıðında: 1) HRDP deneklerin az bir kısmında ortaya çıkar 2) HRDP'nin belirlenmesinde hem gözlemcinin kendi içinde hem de gözlemciler arası yapılan saptamalarda önemli farklılar vardır ve 3) görsel ve bilgisayarca belirlenen HRDP arasında farklılıkları uzlaþtırmak gerektiðinde, eðer HRDP varsa, bilgisayarca yapılan ölçümü tercih etmek gereklidir.

Keywords: Conconi; anaerobic threshold; lactate threshold..

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Figures

Figure 1.
Figure 1.
Intra-observer comparison.
Figure 2.
Figure 2.
Inter-observer comparison.
See this image and copyright information in PMC

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