Hemorheological responses to progressive resistance exercise training in healthy young males.
BACKGROUND
This study aimed to explore the effects of progressive resistance exercise training (PRET) on hemorheology.


METHODS
Exercise sessions included 1-3 sets of 8-12 repetitions at 40-60% of 1-repetition maximum (1-RM) for 3 weeks and at 75-80% of 1-RM during weeks 4-12. Red blood cell (RBC) deformability and aggregation were determined by ektacytometry, plasma and whole blood viscosities (WBV) by rotational viscometry. Lactate concentration was evaluated by an analyzer and fibrinogen was evaluated by coagulometry. Plasma total oxidant/antioxidant status was measured by colorimetry.


RESULTS
Following an acute increase after exercise on the first day, RBC deformability was elevated during weeks 3 and 4 (p=0.028; p=0.034, respectively). The last exercise protocol applied in week 12 again caused an acute increase in this parameter (p=0.034). RBC aggregation was increased acutely on the first day, but decreased after that throughout the protocol (p<0.05). At weeks 4 and 12 pre-exercise measurements of WBV at standard hematocrit and plasma viscosity were decreased (p=0.05; p=0.041, respectively), while post-exercise values were increased (p=0.005; p=0.04, respectively). Post-exercise WBV at autologous hematocrit measured at week 12 was increased (p=0.01). Lactate was elevated after each exercise session (p<0.05). Fibrinogen was decreased on the third week (p<0.01), while it was increased on the 4th week (p=0.005). Plasma antioxidant status was increased at week 3 (p=0.034) and oxidative stress index was decreased at week 4 (p=0.013) after exercise.


CONCLUSIONS
The results of this study indicate that PRET may have positive effects on hemorheological parameters.
Pamukkale University, Faculty of Medicine, Department of Physiology, Kinikli, Denizli, Turkey.
Emine
E
Kilic-Toprak
Fusun
F
Ardic
Gulten
G
Erken
Fatma
F
Unver-Kocak
Vural
V
Kucukatay
Melek
M
Bor-Kucukatay
D000975:Antioxidants / Q000378:metabolism; D001809:Blood Viscosity / Q000502:physiology; D004903:Erythrocyte Aggregation / Q000502:physiology; D004907:Erythrocyte Deformability / Q000502:physiology; D004912:Erythrocytes / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005340:Fibrinogen / Q000378:metabolism; D006262:Health; D018056:Hemorheology / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D016877:Oxidants / Q000097:blood; D018384:Oxidative Stress; D010100:Oxygen / Q000378:metabolism; D055070:Resistance Training; D013997:Time Factors; D055815:Young Adult
D000975:Antioxidants; D016877:Oxidants; D019344:Lactic Acid; D005340:Fibrinogen; D010100:Oxygen