Showing 3 results for Aerobic Training
Rashidlamir A, Hashemi Javaheri A, Jaafari M,
Volume 68, Issue 12 (3-2011)
Abstract
Background: Coronary heart disease is one of the most common causes of death in developed
countries. Fibrinogen and resistin are two inflammatory markers used for atherosclerosis risk prediction. The aim of this study was to examine the
effects of eight weeks of aerobic exercise on the concentrations of fibrinogen and resistin in healthy overweight middle-aged men.
Methods: Thirty inactive middle-aged men with a body mass index of 25-30
were randomly assigned into two experimental and control groups. The participants in the experimental group, accomplished eight weeks (3
sessions per week, of aerobic exercise with an intensity of 50-70% of their maximum heart rate while the control group remained sedentary. Weight,
body fat percentage, fibrinogen and resistin levels of the participants were measured 48 hours before the first and after the last training sessions. The obtained data were analyzed using Independent Samples T-tests.
Results: There were significant reductions in weight, body mass index, body fat percentage and fibrinogen and a significant elevation in resistin concentration in the experimental group (p<0.05) upon the
exercises relative to the control group.
Conclusion: It seems that eight weeks of regular aerobic exercise could reduce risks of
myocardial infarction and improve the health status of overweight middle-aged men through reduction of weight, body fat and fibrinogen and elevation of
resistin concentrations. Elevation of resistin concentration can be a sign of increased antioxidant defense mechanism.
Rashidlamir A, Saadatnia A,
Volume 69, Issue 2 (5-2011)
Abstract
Background: Obesity is currently a worldwide health epidemic which has incited major interest among researchers to look for the underlying mechanisms that regulate body weight. In fact, adiponectin and leptin concentrations that are called adipokines are altered in obesity with a decreased production of adiponectin and an increased production of leptin. Adiponectin has anti-inflammatory, anti-atherosclerotic and anti- insulin resistance properties, but increased levels of leptin are observed in patients with diabetes and cardiovascular diseases. The aim of the present study was to investigate the effects of an 8-week aerobic training program on the plasma levels of adiponectin and leptin in healthy middle-aged men.
Methods: Thirty healthy middle-aged men were selected based on their body fat percentage and were assigned to two equal groups. The experimental group took the 8- week training, four days a week on alternate days with an intensity of 60-80% of their heart rate reserve but the control group lived their sedentary life. Blood samples were collected before and after the training program from all subjects and plasma adipokine levels were measured.
Results: Plasma adiponectin concentration increased while leptin levels decreased significantly (P<0.001 and P≤0.042 respectively) upon completion of the 8-week program. Moreover, reduction in body fat percentage (P≤0.001) negatively correlated with adiponectin (P≤0.001) and positively with leptin changes (P≤0.008).
Conclusion: In healthy middle-aged men, 8-week aerobic training programs could reduce body fat percentage and improve plasma adipokines levels. Therefore, aerobic training can be considered as a major strategy for preventing obesity and its
accompanying diseases.
Mahmoud Nikseresht , Hamid Rajabi , Ali Nikseresht ,
Volume 73, Issue 5 (8-2015)
Abstract
Background: Apelin is an adipokine which may contribute to the link between obesity and metabolic diseases. Regular exercise training has been proposed as a strategy for reducing the risk of these diseases by positive adaptations in adipokines, but there is limited research directly comparing different types of training. The purpose of this study was to determine and compare the effects of nonlinear resistance training (NRT) and aerobic interval training (AIT) on serum levels of apelin-13 and insulin resistance in middle-aged obese men.
Methods: This quasi-experimental study was conducted from October to February 2012 in Ilam City, Iran. Eligible subjects (33 obese men) between aged 34-46 years participated in this study and were allocated to the following groups: NRT (n= 12), AIT (n= 10), and control (n= 11). The inclusion criteria were sedentary (less than 60 minutes physical activity per week), nonsmokers, no regular exercise for at least the past 6 months, no regular consumption of medication, no special diet, percentage body fat > 23% and no history of medical conditions that would prevent them from participating in the exercise intervention. Only the subjects who performed more than 90% of the training sessions were included in this study. The experimental groups performed 3 weekly sessions for 12 weeks, whereas the control group maintained a sedentary lifestyle. NRT consisted of 40-65 minutes of weight training at different intensities and with a flexible period. AIT consisted of running on a treadmill (4×4 min at 80-90% maximal heart rate, 3 min recovery intervals).
Results: Analysis of variance showed that there were no significant differences betwee n the groups for apelin-13 and insulin resistance at baseline (P> 0.05). Compared to control group, two exercise programs were equally effective at reducing insulin resistance, but apelin-13 levels increased significantly only with the AIT (P= 0.04). After the training, maximal oxygen uptake increased significantly in AIT and NRT compared with control group (both P= 0.001) and in AIT more than NRT (P= 0.001).
Conclusion: The practical applications indicate that obese men can use both AIT and NRT exercise programs to reduce insulin resistance. However, the AIT may have better beneficial effects (as indicated by apelin-13) compared to NRT.
