validity of peak vo2 after a maximal 400-m free swimming test using a new model based on...
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Chaverri, D., Iglesias, X., Schuller, T., Barrero, A., Štrumbel, B., Hoffmann, U., Rodríguez, F.A. Validity of peak VO2 after a maximal 400-m free swimming test using a new model based on post-exercise measurements and heart rate kinetics. 18th Annual Congress of the European College of Sport Science, INEFC Barcelona. (Barcelona).
Sport Sciences Research Group INEFC Barcelona Grup de Recerca en Ciències de l'Esport INEFC Barcelona Grup Consolidat (SGR 2014–1665 GRC) Institut Nacional d’Educació Física de Catalunya Av. de l’Estadi, 12-22 08038 Barcelona (Spain) +34 93 425 54 45 http://inefcresearch.wordpress.com/ http://www.slideshare.net/ResearchINEFC [email protected] @Recerca_INEFC
Aim A mathematical model based on heart rate (HR) and post-exercise V’O2 measurements for estimating peak V’O2 at the end of a swimming exercise has recently been implemented (Schuller et al., 2013).
We aimed to ascertain the validity of modeled peak V’O2 after a free 400-m maximal swimming test as compared to direct V’O2 measurements during an incremental 200-m test.
Methods 17 elite swimmers performed 3x200 m at increasing submaximal speeds, followed by a maximal 200-m front crawl swim.
Direct V’O2 measurements V’O2 was measured breath-by-breath using a portable gas analyser (K4 b2, Cosmed, Italy) connected to the swimmer by a respiratory snorkel. HR was measured beat-by-beat from RR intervals (CardioSwim, Freelap, Switzerland). Peak V’O2(200) was the average of the at last 20 s.
Post-exercise V’O2 measurements On a separate session, all swimmers performed an all-out front crawl 400-m swim and respiratory gases were collected at the immediate recovery during 30 s via a Hans-Rudolph 7400 oro-nasal mask. Peak vV’O2(400) was the immediate post-exercise 20-s average calculated using the mathematical model proposed by Schuller et al. (2013). In short, virtual V’O2 at time (t) of recovery [vV’O2(t)] is calculated using the peak HR during the last 10 s of the swim [HR(0)] and the 1-s interpolated value at (t) [(HR(t)], multiplied by the 1-s interpolated V’O2 at (t) [V’O2(t)], according to:
vV’O2(t) = HR(0) / HR(t) · V’O2(t)
Differences between peak V’O2(200) and vV’O2(400) were assessed using a two-tailed paired t-test, and correlation was examined using the Pearson’s linear correlation coefficient (r).
VALIDITY OF PEAK VO2 AFTER A MAXIMAL 400-M FREE SWIMMING TEST USING A NEW MODEL BASED ON POST-EXERCISE MEASUREMENTS AND HEART RATE KINETICS
Chaverri D.1, Iglesias X.1, Schuller T.2, Barrero A.1, Štrumbel, B.3, Hoffmann U.2, Rodríguez F.A.1
1 GRCE, INEFC-Barcelona, Universitat de Barcelona (Spain), 2 Institut für Physiologie und Anatomie, Deutsche Sporthochschule Köln (Germany) 3 University of Ljubljana (Slovenia)
Results • V’O2(200) (mean±SD 3551±657 ml·min-1) was not different from
vV’O2(400) (3535±631; mean diff. 17 ml·min-1, p=0.70).
• Correlation between V’O2(200) and vV’O2(400) was very high (r=0.96) and the standard error of the estimate was low (SEE 180 ml·min-1).
Conclusions • Peak V’O2 can be estimated from exercise HR kinetics and recovery
V’O2 measured after a maximal 400-m test using the modelling procedure by Schuller et al. (2013)
• Post-exercise peak V’O2 attained after a maximal 400-m swim does not differ from peak V’O2 measured at maximal incremental tests on the treadmill or the cycle ergometer in competitive swimmers (Rodríguez, 2000)
• Therefore, we propose the testing and modelling procedure using a maximal 200-m test with continuous HR and post-exercise V’O2 measures as a valid method for estimating maximal V’O2 in competitive swimmers
Schuller T, Rodríguez FA, Iglesias X, Barrero A, Chaverri D, Hoffmann U. (2013) 18th ECSS Annual Congress, Barcelona. Rodríguez FA. (2000). J Sports Med Phys Fitness 40(2), 87-95.
Figure 2. V’O2 measurements during the maximal 200-m test (left) and after the 400-m maximal test (right)
References
Figure 1. V’O2 profile during a maximal 200-m front crawl swim and after 400-m maximal swimming test (n=17)
Time (% of test duration)
V’O
2 (m
l·min
-1)
·
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100
Mean diff. = 17ml·min-1 (p=0.70)
200m Swimming Exercise 400m Recovery Period
TD
20s Avg
20s Avg
Measured V’O2
vV’O2 (400)