Effects of High-Intensity Warm-Up Exercise on Balance for Oxygen Delivery and Utilization in Exercising Muscles
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.37 Vol.37】
ABSTRACT
Heavy priming exercise reduces the oxygen deficit during the subsequent heavy exercise. Current theories for the etiology of the oxygen deficit following the onset of exercise include increased bulk and local blood flow and O₂ delivery (Q) via residual vasodilation and academia/temperature-induced rightward shift of the hemoglobin (Hb) O₂ dissociation curve. We used a method to quantify absolute [deoxy (Hb + Mb), HHb] of superficial- and deeper regions of the rectus femoris (RF) muscle in 6 participants during cycle exercise, using time-resolved NIRS with adipose tissue correction. HHb of the deeper RF for both the priming- and subsequent heavy exercise showed steady state responses toward the end of exercise, suggesting matching of oxygen consumption (VO₂) and Q kinetics. Compared with the superficial RF, peak deoxygenation of the deep RF was not significantly different, however deoxygenation kinetics were slower (mean response time, priming exercise, 35±11 s vs. 66±26 s; subsequent exercise, 32±8 s vs. 44±22 s, p<0.05). These data revealed temporal and spatial disparities in muscle deoxygenation responses to exercise and suggested matching of VO₂ and Q kinetics, thus the oxygen deficit reduced in the deeper region RF muscle, compared with the superficial RF. Further, these results suggest that deep region muscle has a greater Q/VO₂, which led to improve matching of Q-to-VO₂ thereby raising muscle and microvascular oxygen pressure and enhancing bloodmyocyte O₂ flux.
DESCENTE SPORTS SCIENCE Vol.37/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Heavy priming exercise reduces the oxygen deficit during the subsequent heavy exercise. Current theories for the etiology of the oxygen deficit following the onset of exercise include increased bulk and local blood flow and O₂ delivery (Q) via residual vasodilation and academia/temperature-induced rightward shift of the hemoglobin (Hb) O₂ dissociation curve. We used a method to quantify absolute [deoxy (Hb + Mb), HHb] of superficial- and deeper regions of the rectus femoris (RF) muscle in 6 participants during cycle exercise, using time-resolved NIRS with adipose tissue correction. HHb of the deeper RF for both the priming- and subsequent heavy exercise showed steady state responses toward the end of exercise, suggesting matching of oxygen consumption (VO₂) and Q kinetics. Compared with the superficial RF, peak deoxygenation of the deep RF was not significantly different, however deoxygenation kinetics were slower (mean response time, priming exercise, 35±11 s vs. 66±26 s; subsequent exercise, 32±8 s vs. 44±22 s, p<0.05). These data revealed temporal and spatial disparities in muscle deoxygenation responses to exercise and suggested matching of VO₂ and Q kinetics, thus the oxygen deficit reduced in the deeper region RF muscle, compared with the superficial RF. Further, these results suggest that deep region muscle has a greater Q/VO₂, which led to improve matching of Q-to-VO₂ thereby raising muscle and microvascular oxygen pressure and enhancing bloodmyocyte O₂ flux.
DESCENTE SPORTS SCIENCE Vol.37/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Shunsaku Koga*1, Narihiko Kondo*2, Tasturo Amano*2, Yoshiyuki Fukuoka*3, Dai Okushima*4 |
|---|---|
| University or institution | *1 Graduate School of Kobe Design University, *2 School of Human Development, University of Kobe, *3 Faculty of Health and Sports Science, Doshisha University, *4 Kobe Design University, School of Design |
Keywords
Oxygen deficit, Warm-up exercise, Exercising muscle, Oxygen dynamics, Deep region muscle