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標題: The Effect of Repeated Intensive Pulls of Tug-of-War on Immunoendorine Responses
作者: Tzai-Li Li
Chun-Li Lin
Ching-Ju Hung
Kuo-Tung Tseng
關鍵字: Tug-of-war;Stress hormones;Neutrophil function;Th1/Th2 cytokines;IgA
出版社: Taichung, Taiwan :Graduate Institute of Sports & Health Management, National Chung Hsing University
Project: International Journal of Sport and Exercise Science, Volume 3, Issue 1, Page(s) 17-26.
The aims of this study were to determine the effect of repeated intensive pulls of tug-of-war on the same day on
leukocyte mobilization, neutrophil functions, stress hormones, Th1/Th2 cytokine balance, and salivary responses. Eight
elite tug-of-war pullers (age 16.5 ± 0.3 years, height 173.6 ± 1.4 cm, body mass 69.2 ± 2.3 kg, VO2max 46.4 ± 0.7 mL·
kg-1·min-1) were voluntarily recruited from a senior high school. After passing a health questionnaire screen, subjects
signed an informed consent. Visit 1 required the subject to come for measurement of physiological variables. Four days
later, subjects participated in either exercise trial (EX) or control trial (REST) by a counterbalanced order. EX required
the subject to pull 6 sets consisting of 2 pulls with 5 min and 1.5 min rest in between, respectively. The pulling weight
was 1.5 folds of body mass. Blood sampled at pre-exercise and immediate post-exercise, whereas saliva sampled at
pre-exercise, post-set 2, post-set 4, and immediate post-exercise. REST required the subject to have a resting day in the
gymnasium and offering blood and saliva samples at the same timepoints as EX. Water ingestion was allowed ad
libitum during trial except for 5 min before saliva sampling. The main findings of this study were: (1) Pulling endurance
was significantly decreased in the second pull compared with the first pull at Set 1, Set 2 and Set 3; furthermore, the
pulling endurance was also significantly declined after Set 2 in both pulls compared with Set 1. (2) Repeated intensive
pulls (RIP) significantly activated hypothalamic-pituitary-adrenal (HPA)-axis with higher concentrations of both plasma
and salivary cortisol and lower saliva flow rate in exercise trial compared with the values in rest trial. (3) RIP
significantly increased plasma lactate concentrations. (4) RIP did not appear to affect hematocrit, hemoglobin, plasma
glucose, leukocyte mobilization, neutrophil functions, plasma Th1/Th2 cytokine balance, and salivary immunoglobulin
A (IgA) and IgA1 concentration and their secretion rates. In conclusion, the findings of the present study suggest that
the repeated intensive pulls of tug-of-war may induce activations of HPA-axis and sympathetic nervous system.
However the extents of activations appear not strong enough to extensively disturb homeostasis of immunoendocrine.
Furthermore, the heart rate may not be an appropriate indicator for assessing exercise intensity in relatively static
exercise of tug-of-war.
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