Effects of Cryotherapy on Thermoregulation and Recovery of Cardiovascular System Function in Humans after Exercise in Hot and Humid Environment
Objective:It is to evaluate the effects of post-exercise cryotherapy in a hot and hu-mid environment on thermoregulation and the cardiovascular system and to assess its effective-ness.Methods:A randomized crossover own-control design was adopted for each of the 13 sub-jects in three separate experiments.To determine exercise intensity in this experimental,a maxi-mal oxygen uptake test((V)O2max test)was conducted as a preliminary step.Subsequently,they en-gaged in 30 min of constant-load power cycling exercise at an intensity of 70％(V)O2max within a hot and humidity environmental chamber(temperature:35℃,relative humidity:60％).Follow-ing the exercise,the subjects underwent short-duration cryotherapy experiments(2 min)under three different conditions:control(CON),partial-body cryotherapy(PBC,-120℃),and whole-body cryotherapy(WBC,-120℃).Esophageal temperature(Tes),skin temperature(Tsk),thigh muscle temperature(TMT),forearm blood flow(FBF),heart rate(HR),stroke volume(SV),and cardiac output(CO)were continuously monitored under various conditions and time points.The data was subsequently subjected to statistical analysis using a two-factor(condition×time)repeated measures analysis of variance(Two-way ANOVA),followed by the Bonferroni method for post hoc tests.A significance level of P<0.05 was defined for statistical significance.Re-sults:During the experimental period,the interaction of ultra-low temperature cold therapy and time was significantly different for Tes(P<0.01,η2p=0.68),Tsk(P<0.01,η2p=0.47),TMT(P<0.01,η2p=0.79),HR(P=0.03,η2p=0.19),SV(P<0.01,η2p=0.12),and FBF(P<0.01,η2p=0.59),and no significant difference was observed for CO(P=0.96,η2p=0.01).Compared to the CON condition,the PBC condition,which received cryotherapy,and the WBC condition,showed a trend toward significantly lower Tes,Tsk,TMT,and FBF during the resting period after exercise(P<0.05).Moreover,SV showed a significant increase(P<0.05)in both the PBC and WBC conditions as opposed to the CON condition,concurrent with a significant decrease(P<0.05)in HR.Nevertheless,CO did not demonstrate significant differences between conditions(P>0.05).Conclusions:The utilization of whole-body or partial-body cryotherapy following exer-cise in a hot and humid environment can effectively suppress the elevation of core temperature(Tes)and reduce the cardiovascular system's workload.This is expected to expedite the physio-logical recovery of human's post-exercise.
cryotherapyhot and humid environmentthermoregulationcardiovascular
万方数据
维普
