Effects of 8 weeks’ training on systemic and muscle oxygen dynamics in university rugby players

Shun Takagi; Ryotaro Kime; Masatsugu Niwayama; Kuniaki Hirayama; Shizuo Sakamoto

doi:10.1007/978-3-319-55231-6_7

Effects of 8 weeks’ training on systemic and muscle oxygen dynamics in university rugby players

Shun Takagi, Ryotaro Kime, Masatsugu Niwayama, Kuniaki Hirayama, Shizuo Sakamoto

School of Sport Sciences

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The aim of this study was to investigate the effects of 8 weeks of training on O₂ dynamics in university rugby players. University rugby players (n = 15) participated in 5 strength training sessions and 4 field-based training sessions per week for 8 weeks. Before and after 8-weeks’ training, the subjects performed ramp cycling exercise until exhaustion. Muscle O₂ saturation (SmO₂), relative changes from rest in deoxygenated hemoglobin concentration (∆Deoxy-Hb) and total hemoglobin concentration, cardiac output (CO), and pulmonary O₂ uptake (VO₂) were monitored continuously during exercise. Peak VO₂ and CO were normalized by fat-free mass. Though peak VO₂ tended to be increased after training, there were no significant changes in CO, nor any muscle O₂ dynamic variables at peak exercise between before and after training. However, an increase in peak VO₂ was significantly correlated with diminishment of deoxy-Hb and an increase in SmO₂. Changes in CO caused by training were not related to improved peak VO₂. The improvement of peak VO₂ during 8 weeks of rugby training may have been caused by muscle O₂ supply, rather than increased CO or muscle O₂ extraction.

Original language	English
Pages (from-to)	43-49
Number of pages	7
Journal	Advances in Experimental Medicine and Biology
Volume	977
DOIs	https://doi.org/10.1007/978-3-319-55231-6_7
Publication status	Published - 2017

Keywords

Cardiac output
Muscle oxygenation
Near infrared spectroscopy
Peak aerobic capacity
Strength training

ASJC Scopus subject areas

Biochemistry, Genetics and Molecular Biology(all)

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title = "Effects of 8 weeks{\textquoteright} training on systemic and muscle oxygen dynamics in university rugby players",

abstract = "The aim of this study was to investigate the effects of 8 weeks of training on O2 dynamics in university rugby players. University rugby players (n = 15) participated in 5 strength training sessions and 4 field-based training sessions per week for 8 weeks. Before and after 8-weeks{\textquoteright} training, the subjects performed ramp cycling exercise until exhaustion. Muscle O2 saturation (SmO2), relative changes from rest in deoxygenated hemoglobin concentration (∆Deoxy-Hb) and total hemoglobin concentration, cardiac output (CO), and pulmonary O2 uptake (VO2) were monitored continuously during exercise. Peak VO2 and CO were normalized by fat-free mass. Though peak VO2 tended to be increased after training, there were no significant changes in CO, nor any muscle O2 dynamic variables at peak exercise between before and after training. However, an increase in peak VO2 was significantly correlated with diminishment of deoxy-Hb and an increase in SmO2. Changes in CO caused by training were not related to improved peak VO2. The improvement of peak VO2 during 8 weeks of rugby training may have been caused by muscle O2 supply, rather than increased CO or muscle O2 extraction.",

keywords = "Cardiac output, Muscle oxygenation, Near infrared spectroscopy, Peak aerobic capacity, Strength training",

author = "Shun Takagi and Ryotaro Kime and Masatsugu Niwayama and Kuniaki Hirayama and Shizuo Sakamoto",

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