Exercise Physiology
Mitra Khademosharie; Azam Mollanovruzi
Abstract
Background and Objective: Interleukin-6 is the major cytokine involved in initiating the acute phase response, which triggers the synthesis of certain proteins in the liver, such as C-reactive protein. The aim of this study was to investigate the effect of different periods of active recovery on ...
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Background and Objective: Interleukin-6 is the major cytokine involved in initiating the acute phase response, which triggers the synthesis of certain proteins in the liver, such as C-reactive protein. The aim of this study was to investigate the effect of different periods of active recovery on serum IL-6 and hs-CRP response after one session of intense intermittent activity in female swimmers.Methods: In this quasi-experimental study, 10 female swimmers ranging in age from 20 to 26 years were divided into two experimental groups: group 1 (n = 10) and group 2 (n = 10). The subjects swam the distances of 25 meters with maximum speed, the active recovery time in experimental group 1 was three times the duration of swimming and in experimental group 2 was four times the duration of swimming. The intensity of activity during active recovery was considered to be 50 to 60% of the maximum heart rate of the subjects, the subjects swam distances of 25 meters until exhaustion. Blood samples were collected before the start of the training session and after the recovery phase. ANOVA with repeated measures was used to analyze the data. All statistical operations were performed using SPSS software version 16 and the significance level was considered P <0.05.Result: The results of this study showed that there was no significant difference between female swimmers in the effect of two periods of active recovery 1: 3 and 1: 4 on serum hs-CRP (P=0.17) and IL-6 (P=0.24) response after one session of intense interval swimming to exhaustion.Conclusion: Swimmers can use both 3-fold recovery times and 4-fold recovery times, and these two types of recovery was not significantly different in terms of affecting IL-6 and hs-CRP response.
Exercise Physiology
Siamak Rahbar; Sajad Ahmadizad; Hiwa Rahmani
Abstract
Objective: To investigate the effect of L-arginine supplementation on platelet indices in response to a high intensity interval exercise.Methods: Ten healthy overweight young men (BMI=27 ± 1.2 kg/m2) participated voluntarily in this cross-over and double-blind study, and performed a high intensity ...
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Objective: To investigate the effect of L-arginine supplementation on platelet indices in response to a high intensity interval exercise.Methods: Ten healthy overweight young men (BMI=27 ± 1.2 kg/m2) participated voluntarily in this cross-over and double-blind study, and performed a high intensity interval exercise (HIIE) protocol with L-arginine supplementation or placebo, where, two trials were separated by seven days. In each session, the subjects consumed 0.075 g per kg body weight of supplement or placebo which was dissolved in 400 ml of water, and 90 minutes later, performed HIIE as 12 intervals of 3-minute on treadmill (activity: 1-min, 100% of vVO2max, recovery: 2-min, 40% of vVO2max). To measure platelet indices including mean platelet volume (MPV), platelet count (PLT), plateletcrit (PCT) and platelet distribution width (PDW), three blood samples were taken before supplementation and immediately before and after HIIE.Results: Regardless of the type of supplement, HIIE increased PLT and PCT by 29 and 31%, respectively (P < 001), but did not have a significant effect on MPV and PDW. Furthermore, consumption of L-arginine 90 min prior to HIIE, inhibited PCT (P = 0.043) but had no effect on PLT.Conclusion: Intermittent nature and recovery periods in HIIE protocol did not significantly increase MPV and PDW in both sessions, which may be a reason for the safety of the HIIE. L-arginine supplementation prior to HIIE only reduced PCT, due to its inability to affect other indices, to achieve more accurate results further studies with more effective doses of supplementation are needed.
