Effects of one week different intensity endurance exercise on cardiorespiratory and cardiometabolic markers in junior young athletes.

BACKGROUND: Endurance training in varied intensity zones are more likely to show different adaptive responses. However, it is still unclear the intensity level of endurance exercise in junior young athletes that may promote increased markers for cardiorespiratory and cardiometabolic response. Therefore, we aimed to investigate the effect of 1 week different intensity endurance training on markers of cardiorespiratory and cardiometabolic response in young athletes. METHODS: Thirty apparently healthy male young athletes averaging 19.4±1.3 years of age were recruited and randomly assigned to two different intensity endurance training groups. The first group trained at 60% to 70% maximum heart rate (HRmax) for 45 min per session and the second group trained at 70% to 80% HRmax for 30 min per session for a period of 1 week three sessions per week. A pre-training and post-training, marker of cardiorespiratory and cardiometabolic response was assessed for both groups. RESULTS: Both intensity training had no significant effect on markers of cardiorespiratory response within and between training groups (p>0.05). Whereas, cardiometabolic markers lactate dehydrogenase (p=0.001), cardiac troponin I (p=0.001) and creatine kinase myocardial band (p=0.001) significantly increased at the end of 1 week within the group in both training groups (p≤0. 05). In the comparative analysis between groups, there was no significant difference in markers of cardiometabolic response (p>0.05). CONCLUSION: 1 week 60% to 70% HRmax and 70% to 80% HRmax intensity zones induces similar acute effects on markers for cardiometabolic and cardiorespiratory responses between groups and significant elevations of cardiometabolic markers within the groups in moderately trained young athletes.

Does chronic high-intensity endurance training have an effect on cardiovascular markers of active populations and athletes? Systematic review and meta-analysis.

OBJECTIVE: The objective of this study was to ascertain the effects of high-intensity chronic endurance training on cardiovascular markers of active populations and athletes. METHODS: This review was conducted in accordance with the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. We used databases of PubMed, Science Direct, SPORTDiscus, Google Scholar and grey literatures with Mesh and free-text search as well as manual searches to identify relevant studies from June 2017 to September 2019. Weighted standardised mean differences and effect size of the intervention group versus the control group were calculated using a random effect model with 95% CI. RESULT: There was significant improvement in high-density lipoprotein with weighted standardised mean difference and effect size=-1.06 (-1.83 to -0.30), p=0.006. We have also observed a significant reduction in low-density lipoprotein and total cholesterol with weighted standardised mean difference and effect size=-0.97 (-1.58 to -0.36), p=0.002, and = -0.78 (-1.34 to -0.22), p=0.007, respectively. There was a significant reduction in interleukin 6 (IL-6) using a fixed effect model with weighted standardised mean difference and effect size=-0.87 (-1.33 to -0.40), p=0.0003 and C reactive protein (CRP) with weighted standardised mean differences and effect size=-0.41 (-0.73 to -0.09), p=0.01. CONCLUSION: Chronic high-intensity endurance training improves healthy lipid profiles (increase high-density lipoprotein, decreased low-density lipoprotein and total cholesterol). And decreased inflammatory markers (IL-6 and CRP) independent of age and sex and cannot be associated with an increased risk of developing cardiovascular disease. PROSPERO REGISTRATION NUMBER: CRD 42017081369.

Serum cardiac markers are inversely associated with VO2max of amateur athletes in response to endurance training adaptations.

BACKGROUND: The influence of endurance training intensity and adaptation on serum cardiac markers is poorly understood and controversial; however, no enough data observed the association of serum cardiac markers with VO2max. Therefore, we aimed to investigate whether serum cardiac markers are associated with maximum oxygen consumption (VO2max) in response to 12-week endurance training on amateur athletes. METHODS: 15 apparently healthy male amateur athletes with 19.47 ± 1.30 years of age were recruited and participated in endurance training with 70%-80% maximal heart rate intensity for 35 min per session for the first week and 2 min increments each week from the second to the last week for a period of 12 weeks. VO2max and serum cardiac markers (lactate dehydrogenase [LDH], creatine kinase myocardial band (CK-MB) and cardiac troponin I [CTnI]) were assessed at the beginning of the training and after 12-week endurance training. RESULTS: The result of CTnI indicated significantly (p < 0.01) and inversely (r = - 0.466) correlated with VO2max and CK-MB indicated significantly (p < 0.01) and inversely associated with VO2max (r = - 0.536) with moderate relationship. However, we did not find a significant association on LDH (p > 0.05) with VO2max in response to endurance training adaptation. CONCLUSION: Our finding confirms our hypothesis that serum cardiac markers are inversely associated with estimated VO2max in response to endurance training adaptation.