Sub-maximal heart rate is associated with changes in high-intensity intermittent running ability in professional rugby league players. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Hulin, Billy T.; Gabbett, Tim J.; Johnston, Rich D.; Jenkins, David G.
• Is Part Of: Science and medicine in football. Volume 3:Issue 1(2019)
• Page Start: 50
• Page End: 56
• Publication Date: 2019-01-02
• Subjects: Validity -- reliability -- monitoring -- fitness; Soccer injuries -- Periodicals; Soccer -- Physiological aspects -- Periodicals; Sports medicine -- Periodicals; Soccer -- Psychological aspects -- Periodicals; 617.102763
• DOI: 10.1080/24733938.2018.1475748
• Languages: English
• ISSNs: 2473-3938

Abstract

ABSTRACT: Objectives : We examined: (1) relationships among sub-maximal heart rate (sub-max HR) following 4 minutes of the Yo-Yo intermittent recovery test level 1 (IR1) and maximal-effort performance (distance covered at volitional exhaustion), (2) test re-test reliability ofsub-max HR, and (3) whether changes in maximal-effort Yo-Yo performance are related with changes insub-max HR in professional rugby league players. Methods : Yo-Yo IR1 performances of 32 players were assessed before and after 28.5 ± 6.8 days of pre-season training. Relationships betweensub-max HR and maximal-effort Yo-Yo performance, and changes in maximal-effort performance andsub-max HR were compared. Results : Maximal-effort Yo-Yo IR1 performance andsub-max HR correlated negatively (r = −0.73, CI −0.85 to −0.55, very large ). Coefficient of variation (CV) ofsub-max HR was 2.4% (CI 2.0−3.3%), worthwhile changes of small (0.7 [CI 0.5−1.0%]), moderate (2.1 [CI 1.6−3.0%]) and large (4.3 [CI 3.3−6.1%]) were identified. Training-induced changes insub-max HR and Yo-Yo IR1 performance displayed a negative correlation (r = −0.57, CI −0.74 to −0.33, large ). Conclusions :sub-max HR has a very large negative relationship with maximal-effort Yo-Yo IR1 performance. Training-induced changes insub-max HR demonstrated a large negative relationship with changes in Yo-Yo IR1 performance. The CV and worthwhile changes can determine meaningful variations insub-max HR in professional rugby league players.