Tactical Circuit Training Improves Blood Pressure and Vascular Health More Than Resistance Training.

Exercise training is known to reduce CVD risk factors; however, in tactical populations, like veterans and firefighters, the effects of different forms of exercise such as tactical circuit training (CT) or conventional resistance training (RT) is unclear. Thus, the purpose of this study was to compare changes in various CVD risk measures after 4-week tactical CT or RT programs. Thirty-seven firefighters (20 CT, 17 RT), 35% of whom were veterans, participated. Pre- and post-intervention measures included body fat (BF%), carotid artery intima media thickness (IMT), central and brachial BP, and indices of arterial stiffness (augmentation index, Aix@75), myocardial oxygenation (subendocardial viability ratio, SEVR), and endothelial function (flow-mediated dilation, FMD). Estimation of maximum oxygen consumption (VO2peak) for aerobic fitness, balance, muscular endurance, and strength were also compared. For the clinical laboratory values, there were no between group differences and the only within group change was found in triglyceride levels. Tactical CT lowered triglyceride levels by 24.2% (P < 0.05). Only tactical CT exercise lowered BP. Both brachial (4.6% reduction) and central (4.4 % reduction) systolic and diastolic SBP and DBP decreased with CT (all P ≤ 0.01). After training we found improvements in FMD and SEVR with tactical CT only. Percent FMD increased by 28.7% (P < 0.01) while SEVR increased by 4.4% (P < 0.05) in the tactical CT group. Fitness improved in both cohorts (P < 0.05). These data suggest that 4 weeks of a CT program improves several CVD-risk factors and may be more beneficial.

Effects of circuit exercise training on vascular health and blood pressure.

As the global burden of cardiovascular disease (CVD) rises, public health-related interventions aimed at prevention of heart disease have gained medical attention. Clinical research reports that exercise is a protective risk factor associated with CVD and that clinicians need to provide exercise recommendations to patients. Nevertheless, physical inactivity remains a public health problem. In certain populations, like firefighters (FF), increased risk of CVD is especially concerning. The workload FF face is extreme, 50% of line-of-duty deaths (LODD) in FF are cardiac-related, and research on the volunteer FF population is scarce. Government regulations do not require volunteer FF companies to have fitness testing or programming, so exercise intervention studies are necessary to improve the burden of CVD risk in this population. Therefore, this study examined the effects of a 4-week exercise circuit training (CT) intervention on vascular health and fitness in volunteer FF (N = 27) from the Philadelphia PA area compared to a control group of Non-FF (N = 25). Carotid artery intima-media thickness (IMT), brachial artery flow-mediated dilation (FMD), augmentation index, and pulse pressure (PP), brachial and central blood pressure (BP) and fitness were measured pre- and post- intervention. Overall, volunteer FF had more significant improvements (p < 0.05) in vascular health measures (FMD, IMT, and PP). In both groups, we also found that brachial and central BP decreased with exercise. We show that a 4 week CT program can improve vascular structure and function in the volunteer FF population, suggesting that clinicians may be able to reduce or prevent cardiac LODD by exercise.

Heart Rate and Blood Pressure Responses to Gear Weight Under a Controlled Workload.

OBJECTIVE: To compare the effects of personal protective equipment (PPE) weight on blood pressure (BP) and heart rate (HR), between volunteer firefighters (FF) and athletes. METHODS: Athletes and FF were matched by body size and came to the lab twice for two treadmill tests. The "Regular" test was completed in normal fitness clothing, and PPE test was completed in full structural PPE with monitoring of HR assessment every minute and BP each stage. RESULTS: In the FF cohort, all submaximal HR and BP levels were different. HRmax and VO2max were also different (all P < 0.05). In athletes, HRmax was higher in Regular test than PPE. CONCLUSIONS: Future research should examine the effect of different PPE weights on HR and BP responses.

Carotid Artery IMT, Blood Pressure, and Cardiovascular Risk Factors in Males and Females.

Previous studies have investigated carotid artery intima-media thickness (IMT) and blood pressure and found a direct correlation between the two. It is known that adult females have better cardiovascular health than males until a certain stage of life, yet limited research has examined gender differences in vascular function. Thus, the purpose of this study was to investigate vascular structure and function, blood pressure, and blood glucose/cholesterol levels in relation to gender differences in young healthy adults. On three separate days, 44 adults (26.30 ± 11.9yrs; 24M, 20F) completed a carotid IMT ultrasound, a flow-mediated dilation (FMD), a fasted glucose and cholesterol test, a 24hr ambulatory blood pressure monitoring, a VO2max test, and a body composition measurement. Females had lower systolic blood pressure, lower diastolic blood pressure, lower LDL/HDL ratios, lower body mass index, a higher HDL count, and lower plasma glucose levels than males (p < 0.05 for all), all of which suggest better cardiovascular health. However, we found no gender differences in vascular health measures, IMT and FMD. Our results suggest that while young adult females have better cardiovascular health than males, endothelial function may not yet be affected in the young adult years.

Vascular Health in American Football Players: Cardiovascular Risk Increased in Division III Players.

Studies report that football players have high blood pressure (BP) and increased cardiovascular risk. There are over 70,000 NCAA football players and 450 Division III schools sponsor football programs, yet limited research exists on vascular health of athletes. This study aimed to compare vascular and cardiovascular health measures between football players and nonathlete controls. Twenty-three athletes and 19 nonathletes participated. Vascular health measures included flow-mediated dilation (FMD) and carotid artery intima-media thickness (IMT). Cardiovascular measures included clinic and 24 hr BP levels, body composition, VO2 max, and fasting glucose/cholesterol levels. Compared to controls, football players had a worse vascular and cardiovascular profile. Football players had thicker carotid artery IMT (0.49 ± 0.06 mm versus 0.46 ± 0.07 mm) and larger brachial artery diameter during FMD (4.3 ± 0.5 mm versus 3.7 ± 0.6 mm), but no difference in percent FMD. Systolic BP was significantly higher in football players at all measurements: resting (128.2 ± 6.4 mmHg versus 122.4 ± 6.8 mmHg), submaximal exercise (150.4 ± 18.8 mmHg versus 137.3 ± 9.5 mmHg), maximal exercise (211.3 ± 25.9 mmHg versus 191.4 ± 19.2 mmHg), and 24-hour BP (124.9 ± 6.3 mmHg versus 109.8 ± 3.7 mmHg). Football players also had higher fasting glucose (91.6 ± 6.5 mg/dL versus 86.6 ± 5.8 mg/dL), lower HDL (36.5 ± 11.2 mg/dL versus 47.1 ± 14.8 mg/dL), and higher body fat percentage (29.2 ± 7.9% versus 23.2 ± 7.0%). Division III collegiate football players remain an understudied population and may be at increased cardiovascular risk.