Effects of resistance training on CO2 excess and swimming performance in competitive swimmers.
- VernacularTitle:水泳選手のレジスタンストレーニングが過剰ＣＯ２排出量およびスイムパフォーマンスに及ぼす影響
- Author:
YASUHIRO SUZUKI
;
HIDEYUKI TAKAHASHI
;
YUJI ITAI
;
KAORU TAKAMATSU
- Publication Type:Journal Article
- Keywords:
resistance training;
muscle mass;
CO2 excess;
bicarbonate buffering system;
swimming performance
- From:Japanese Journal of Physical Fitness and Sports Medicine
2000;49(3):355-363
- CountryJapan
- Language:Japanese
-
Abstract:
The purpose of the present study was to determine the change in total excess volume of CO2output (CO2excess) due to bicarbonate buffering of lactic acid produced during exercise and change in swimming performance following resistance training for 8 weeks in competitive swimmers. Ten healthy university competitive swimmers were assigned to either a resistance training and swimming training group (COMBINE: N=5) or a swimming training only group (SWIM: N=5) . Muscle mass was measured using magnetic resonance imaging (MRI) . CO2excess and blood lactate concentration were measured during incremental exercise on a cycle ergometer and swimming performance was measured during competition. COMBINE showed a significantly higher percentage change in muscle mass (11.1±4.5%) than SWIM (3.5±2.5%) . The percentage change in CO2excess, CO2excess per body weight (CO2excess/BW) and CO2excess/BW per blood lactate accumulation (CO2excess/BW/ΔLa) during exercise was significantly higher in COMBINE (107.3±60.1, 102.6±56.8, 59.1±37.7%, respectively) than in SWIM (42.5±10.0, 42.9±10.4, 13.4±22.4%, respectively) . The percentage change in swimming performance was significantly higher in COMBINE (2.2±1.8%) than in SWIM (-2.0±3.6%) . A negative correlation between percentage change of muscle mass and percentage change of CO2excess/BW/ ΔLa (SWIM: r=-0.993, P<0.01, COMBINE: r=-0.744, P>0.05) was found. It was suggested that combined swim and resistance training resulted in greater increases in the bicarbonate buffering system (CO2excess/BW/ΔLa) . However, increases in muscle mass may have subsequently caused a relative decrease in the contribution of the bicarbonate buffering system.
