The Comparison of Concurrent Exercise Performance in the Morning and Evening on Cardiovascular Inflammatory Markers in Active Men

The aim of this study was to compare the response of high sensitivity reactive protein (hs- CRP) and fibrinogen to a concurrent endurance-strength exercise in the morning and afternoon. Participants were 10 active male university students (age 25.1±1.287 yr, weight 72.1±6.540 kg, and height 177.2±7.757 cm) who completed 2 experimental phases during 5 days. The first phase was performing concurrent endurance (running on treadmill for 35 minutes at 85% of maximum heart rate) and resistance (5 weight exercise with 80% 1RM) exercise in the morning. In the second phase, subjects performed the same protocol in the afternoon. Blood samples were collected before, immediately after and 3 hours after the exercise protocol and were used to measure hs- CRP and fibrinogen response. The findings showed that the exercise protocol had no significant effect on the response of hs-CRP in different time intervals in the two phases (P=0.331). On the other hand, the findings showed a significant difference in fibrinogen response after the exercise protocol between the first and second phases (P˂0.05), that is, plasma fibrinogen level significantly increased following the performance of the exercise protocol in the morning (12%) (P=0.000), but in the afternoon showed a slight increase (2%) that was not significant. With regards to the results of this study, it is suggested that the performance of exercises is safer in the afternoon than the morning from the cardiovascular health aspect and observing the time of exercise,physicians and coaches can prescribe these kinds of exercise for patients and athletes.