title: Ratings of Perceived Exertion and Physiological Parameters of Muscle Metabolism in Postmenopausal Women.
abstract: We compared responses from postmenopausal women living a sedentary lifestyle ( n = 15; Mean age= 59; SD = 4.2) to a single bout of water- or land-based exercise with respect to ratings of perceived exertion (RPE), lactate concentration, and muscle oxygen saturation. Each participant was randomly assigned to a single water- or land-based 50-minute bout of combined aerobic and resistance exercise. Blood samples were collected to detect pre- and post-exercise lactate concentration. Total hemoglobin, deoxidized hemoglobin, and the percentage change in the total oxygen saturation index (TSI%) of the rectus femoris were detected by means of near-infrared spectroscopy. We found similar RPE at various stages of land- and water-based exercise, and a similar change in lactate concentration in these environments (in water: 4.35 ± 1.49 mol/L; on land: 3.62 ± 1.18 mol/L). However, the reduction in HHb response was less pronounced after water-based exercise, and TSI% increased on land but decreased in water, with the magnitude of this change much higher on land. For similar RPE and lactate concentration, the oxygen saturation in the exercising muscles decreased in water, suggesting higher oxygen consumption in water than on land.
authors.affiliation: 1 Sport Science College, Jilin Sport University, China.
authors.forename: Guo-Dong
authors.initials: GD
authors.lastname: Ma
authors.affiliation: 2 Graduate Institute of Sport Equipment Technology, University of Taipei, Taiwan.
authors.forename: Wan-Chin
authors.initials: WC
authors.lastname: Chen
authors.affiliation: 3 Department of Exercise and Health Sciences, University of Taipei, Taiwan.
authors.forename: Shu-Min
authors.initials: SM
authors.lastname: Tsai
authors.affiliation: 4 Center for General Education, Taipei Medical University, Taiwan.
authors.forename: Nai-Wen
authors.initials: NW
authors.lastname: Kan
authors.affiliation: 5 Department of Nutrition and Health Sciences, College of Human Ecology, Chang Gung University of Science and Technology, Taiwan.|6 Research Center for Industry of Human Ecology, College of Human Ecology, Chang Gung University of Science and Technology, Taiwan.
authors.forename: Li-Ling
authors.initials: LL
authors.lastname: Chiu
authors.affiliation: 7 Graduate Institute of Sports Science, National Taiwan Sport University, Taiwan.
authors.forename: Kuei-Yu
authors.initials: KY
authors.lastname: Chien
mesh_terms: D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D017698:Postmenopause / Q000097:blood / Q000378:metabolism / Q000502:physiology*; D052097:Quadriceps Muscle / Q000378:metabolism*; D057185:Sedentary Behavior; D019265:Spectroscopy, Near-Infrared
chemical_list: D019344:Lactic Acid
keywords: Rating of perceived exertion; aquatic fitness; blood flow; combined exercise program; near-infrared spectroscopy; sedentary lifestyle