期刊
INTERNATIONAL JOURNAL OF SPORTS PHYSIOLOGY AND PERFORMANCE
卷 11, 期 2, 页码 154-158出版社
HUMAN KINETICS PUBL INC
DOI: 10.1123/ijspp.2015-0038
关键词
cardiac autonomic system; futsal; court sports; athletic monitoring
Purpose: To compare the LnRMSSD and the LnRMSSD:RR values obtained during a 5-min stabilization period with the subsequent 5-min criterion period and to determine the time course for LnRMSSD and LnRMSSD:RR stabilization at 1-min analysis in elite team-sport athletes. Participants: 35 elite futsal players (23.9 +/- 4.5 y, 174.2 +/- 4.0 cm, 74.0 +/- 7.5 kg, 1576.2 +/- 396.3 m in the Yo-Yo test level 1). Methods: The RR-interval recordings were obtained using a portable heart-rate monitor continuously for 10 min in the seated position. The 2 dependent variables analyzed were LnRMSSD and LnRMSSD:RR. To calculate the magnitude of the differences between time periods, effect-size (ES) analysis was conducted. To assess the levels of agreement, intraclass correlation coefficients (ICC) and Bland-Altman plots were used. Results: The LnRMSSD and LnRMSSD:RR values obtained during the stabilization period (0-5 min) presented very large to nearly perfect ICCs with the values obtained during the criterion period (5-10 min), with trivial ESs. In the ultra-short-term analysis (ie, 1-min segments) the data showed slightly less accurate results, but only trivial to small differences with very large to nearly perfect ICCs were found. Conclusion: LnRMSSD and LnRMSSD:RR can be recorded in 5 min without traditional stabilization periods under resting conditions in team-sport athletes. The ultra-short-term analysis (1 min) also revealed acceptable levels of agreement with the criterion.
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