Land vs. water HIIE effects on muscle oxygenation and physiological parameter responses in postmenopausal women

• Published in: Scientific reports Vol. 10; no. 1; p. 13754
• Main Authors: Chien, Kuei-Yu, Kan, Nai-Wen, Liao, Yi-Hung, Yang, Wen-Ting, Yang, Yong
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 13.08.2020; Nature Publishing Group
• Subjects: 631/443/1338; 631/443/1784; 631/443/592; Aged; Blood levels; Cross-Over Studies; Fatigue - physiopathology; Female; Heart rate; Heart Rate - physiology; Hemoglobin; High-Intensity Interval Training; Humanities and Social Sciences; Humans; Lactic acid; Lactic Acid - blood; Middle Aged; multidisciplinary; Myocardium - metabolism; Oxygen - metabolism; Oxygen Consumption - physiology; Oxygenation; Physical training; Physiology; Post-menopause; Postmenopause - physiology; Quadriceps Muscle - metabolism; Recovery of Function - physiology; Science; Science (multidisciplinary)
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-70599-6

Muscle oxygenation (MO) status is the dynamic balance between O 2 utilization and O 2 delivery. Low-impact high-intensity interval exercise MO responses in the exercise and recovery stage are still unclear. We compared the differences in MO and physiological parameters between high-intensity interval water-based exercise (WHIIE) and high-intensity interval land bike ergonomic exercise (LBEHIIE) in postmenopausal women. Eleven postmenopausal women completed WHIIE or LBEHIIE in counter-balanced order. Eight sets were performed and each exercise set included high intensity with 80% heart rate reserve (HRR) in 30 s and dynamic recovery with 50% HRR in 90 s. Muscle tissue oxygen saturation index (TSI), total hemoglobin (tHb), oxy-hemoglobin (O 2 Hb), and deoxy-hemoglobin (HHb) were recorded. Blood lactate, heart rate and rating of perceived exertion (RPE) were measured at pre and post-exercise. Under similar exercise intensity, RPE in WHIIE was lower than that in LBEHIIE. The heart rate in WHIIE was lower than that in LBEHIIE at 1 and 2 min post-exercise. During the dynamic recovery, TSI, tHb, and O2Hb in water were higher than on land. A negative correlation was found between the change in TSI and lactate concentration (r = − 0.664). WHIIE produced greater muscle oxygenation during dynamic recovery. Muscle TSI% was inversely related to blood lactate concentration during exercise in water.