Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2015) 14, 602 - 605

Research article
Ultra-Short-Term Heart Rate Variability is Sensitive to Training Effects in Team Sports Players
Fabio Y. Nakamura1,2, , Andrew A. Flatt3, Lucas A. Pereira1, Rodrigo Ramirez-Campillo4, Irineu Loturco1, Michael R. Esco3
Author Information
1 Nucleus of High Performance in Sport – NAR, São Paulo, SP, Brazil
2 State University of Londrina, Londrina, PR, Brazil
3 University of Alabama, Department of Kinesiology, Exercise Physiology Laboratory, Tuscaloosa, AL, USA
4 Department of Physical Activity Sciences, University of Los Lagos, Campus of Chuyaca, Osorno, Chile

Fabio Y. Nakamura
✉ FY, Av. Padre José Maria, 555 - Santo Amaro, 04753-060 – São Paulo, SP, Brazil
Publish Date
Received: 20-05-2015
Accepted: 11-06-2015
Published (online): 11-08-2015
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The aim of this study was to test the possibility of the ultra-short-term lnRMSSD (measured in 1-min post-1-min stabilization period) to detect training induced adaptations in futsal players. Twenty-four elite futsal players underwent HRV assessments pre- and post-three or four weeks preseason training. From the 10-min HRV recording period, lnRMSSD was analyzed in the following time segments: 1) from 0-5 min (i.e., stabilization period); 2) from 0-1 min; 1-2 min; 2-3 min; 3-4 min; 4-5 min and; 3) from 5-10 min (i.e., criterion period). The lnRMSSD was almost certainly higher (100/00/00) using the magnitude-based inference in all periods at the post- moment. The correlation between changes in ultra-short-term lnRMSSD (i.e., 0-1 min; 1-2 min; 2-3 min; 3-4 min; 4-5 min) and lnRMSSDCriterion ranged between 0.45-0.75, with the highest value (p = 0.75; 90% CI: 0.55 – 0.85) found between ultra-short-term lnRMDSSD at 1-2 min and lnRMSSDCriterion. In conclusion, lnRMSSD determined in a short period of 1-min is sensitive to training induced changes in futsal players (based on the very large correlation to the criterion measure), and can be used to track cardiac autonomic adaptations.

Key words: Court sports, athletic monitoring, cardiac autonomic system, futsal

           Key Points
  • The ultra-short-term (1 min) natural log of the root-mean-square difference of successive normal RR intervals (lnRMSSD) is sensitive to training effects in futsal players
  • The ultra-short-term lnRMSSD may simplify the assessment of the cardiac autonomic changes in the field compared to the traditional and lengthier (10 min duration) analysis
  • Coaches are encouraged to implement the ultra-short-term heart rate variability in their routines to monitor team sports athletes
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