Effects Of Cryotherapy At Different Temperatures On Delayed Onset Muscle Soreness Of Biceps Brachii And Brachial Triceps In Male College Students

Objective:To analyze the effects of different temperature intervention on pain and muscle strength by intervening the delayed onset muscle soreness of biceps brachii and brachial triceps with cryotherapy at different temperatures,so as to explore the role and mechanism of cryotherapy in the sequential recovery of delayed onset muscle soreness,enrich the means and measures for the recovery of delayed onset muscle soreness,and provide a certain research and application basis for the application of cryotherapy in sports injuries.Methods:24healthy malestudents aged 21-25 yearsold in Shenyang Sport University weretakenas research objects.They were randomly divided into three groups: control group,cryotherapy group A(constant temperature 10℃)and cryotherapy group B(constant temperature 6℃),with 8 people in each group.Group A andgroup B were recovered by cryotherapy at different temperatures immediately after modeling,and the cryotherapy time was 10 min.Firstly,the elbow joint was modeled by Ariel Intelligent Isokinetic Muscle Strength Test System(ACES),and then measured synchronously by ACES and surface electromyography(Finland ME6000).The elbow joint was flexed and extended 5 times as a group of actions,and the test data were collected at five time points(1 day before modeling,immediately after modeling,24 h,48 h and 72 h).Visual analogue scale(VAS),relative peak torque(r PT),relative peak torque duration,root mean square amplitude(RMS)of surface electromyography and integrated electromyography(i EMG)were selected as test indexes.Results:1.In the indexes of VAS,the pain value of each group reached the highest 48 hours after the end of modeling,showing a first increasing and then decreasing trend.Compared with the same group immediately after modeling,the effect of cryotherapy group A andgroup B at 24 h and 48 h was significantly higher than that immediately after modeling,and that at 72 h less than that immediately after modeling(P < 0.01);control group at 24 h and 48 h was significantly higher than that immediately after modeling(P < 0.01),and that at 72 h less than that immediately after modeling(P < 0.05).Cryotherapy group A andgroup B were significantly less than control group at each time point(P < 0.01),and cryotherapy group B at 24 h,48 h and 72 h was less than cryotherapy group A at the corresponding time points.(P < 0.05).2.In ACES,r PT and relative peak torque duration were significantly lower than baseline at different angular velocities in the control group(P < 0.01);cryotherapy group A andgroup B were significantly lower than the baseline of the same group immediately after modeling,at 24 h and 48h(P < 0.01),but there was no significant difference at 72 h compared with the baseline of the same group.At different speeds,each group showed a first decreasing and then increasing trend,and reached the lowest value immediately after modeling or at 24 h,and then increased significantly at48 h and 72 h.Comparison among groups: at 60 °/s and 120 °/s,r PT of biceps brachii in cryotherapy group B were higher than that in cryotherapy group A at 72 h(P < 0.05);at 60 °/s and 120 °/s,the r PT of brachial triceps in cryotherapy group B was higher than that in cryotherapy group A at 48 h(P < 0.05).The peak torque duration of biceps brachii and brachial triceps at 60 °/s was significantly longer in cryotherapy group B than in cryotherapy group A at 72 h(P < 0.01);at120 °/s,cryotherapy group B was significantly higher than cryotherapy group A at 48 h(P < 0.01).However,the r PT and peak torque duration in cryotherapy group A and cryotherapy group B were not statistically significant at each time at 180 °/s.3.In the indexes of surface electromyography,i EMG and RMS were significantly higher than baseline at different angular velocities in the control group(P < 0.01);cryotherapy group A andgroup B immediately after modeling,at 24 h,48 h and 72 h were significantly higher than the baseline of the same group(P < 0.01),but there was no significant difference at 72 h compared with the baseline of the same group.Each group showed a first rising and then decreasing trend at different velocities,and reached the highest value immediately after modeling or at 24 h,and then decreased significantly at 48 h and 72 h.The i EMG and RMS of biceps brachii and brachial triceps at 60 °/s and 120 °/s were lower in group B than that of group A at 72 h(P < 0.05),and there was no significant difference between group B and group A at 180 °/s.4.Under the same temperature,the r PT and RMS of biceps brachii and brachial triceps were not statistically significant in different time points.Conclusion:1.Cryotherapy can relieve the symptoms of delayed onset muscle soreness and accelerate the recovery of muscle strength;constant temperature of 6 ℃ is better than 10 ℃ in improving muscle pain and restoring muscle strength.2.Under different muscle contraction velocities,the constant temperature of 6 ℃ can obviously improve muscle strength compared with the constant temperature of 10 ℃ at low speed and medium speed;However,under the condition of high-speed contraction,the improvement effect of two temperatures on muscle strength is not obvious.3.At different time points,the effect of cryotherapy on DOMS was different.The recovery speed of pain and muscle strength was more obvious at 48 h and 72 h compared with immediate and 24 h,and the body index value basically tended to the initial baseline level at 72 h.4.Under different muscle types,the effect of cryotherapy at the same temperature on muscle strength recovery of biceps brachii and brachial triceps is basically identical at different time points.