The Effects Of Constant Load Exercise On Mucosal Immunity Parameters In A Cold Environment In College Athletes

Purpose: The purpose of this study was to observe mucosal immunity parameters and serum stress hormones before and after 1h exercise in a cold and mild environment,and to explore the effects of exercise in a cold environment on mucosal immunity and serum stress hormones in male college athletes.Methods: This study used experimental method,and thirteen male college athletes(age: 25.46±1.20 years,training period: 5.85±1.34 years,weight: 73.05±9.2kg,height: 175.85±6.76 cm,VO2max:44.75±3.82ml/kg/min)in Shenyang Sport University were recruited as subjects,cycling for 1h on a stationary ergometer at60%VO2max in a cold environment(7.9±0.9?)or mild environment as control(21.2±1.3?).Two trails were separated at least 7 days.Unstimulated whole-saliva samples and venous blood samples were collected at preexercise,postexercise,and 1h postexercise.The levels of sIgA,?-amylase,lysozyme,lactoferrin in saliva and the levels of cortisol and adrenaline in serum were measured.Results:(1)The sIgA concentration(218.18±67.18ug/ml)at postexercise was significantly higher t-han that at preexercise(149.61±33.23ug/ml)(P<0.05);?-amylase concentration(361.39±173.89U/mgprot)at postexercise was significantly higher than that at preexercise(202.79±87.23U/mgprot)(P<0.05);lysozyme concentration(26.74±24.10ug/ml)at postexercise was significantly higher than that at preexercise(12.59±4.37ug/ml)(P<0.05),lactoferrin concentration(1.40±0.53ug/ml)at post-exercise was significantly higher than that at preexercise(1.03±0.09ug/ml)(P<0.05)in a mild environment.(2)The sIgA concentration(208.62±63.16ug/ml)at postexercise was significantly higher t-han that at preexercise(161.34±63.75ug/ml)(P<0.05)and ?-amylase concentration(354.46±208.49U/mgprot)at postexercise was also significantly higher than that at preexercise(253.98±210.77U/mgprot)(P<0.05)in a cold environment.(3)There was no significant difference in sIgA concentration at postexercise between a mild en-vironment(218.18±67.18ug/ml)and cold environment(208.62±63.16ug/ml)(P>0.05);there was no significant difference in ?-amylase concentration at postexercise between a mild environment(361.39±173.89U/mgprot)and cold environment(354.46±208.49U/mgprot)(P>0.05);there was no signifi-cant difference in lysozyme concentration at postexercise between a mild environment(26.74±24.10ug/ml)and cold environment(16.43±11.27ug/ml)(P>0.05);there was no significant differenc-e in lactoferrin concentration at postexercise between a mild environment(1.40±0.53ug/ml)a-nd cold environment(1.31±0.35ug/ml)(P>0.05).Conclusions:(1)A bout of moderate exercise in a mild environment promotes mucosal immunity.(2)A bout of exercise in a cold environment has no influence on mucosal immunity.