Does obesity attenuate the beneficial cardiovascular effects of cardiorespiratory fitness?

The association of cardiorespiratory fitness and the risk of hypertension: a systematic review and dose-response meta-analysis

Established evidence has indicated a negative correlation between cardiorespiratory fitness (CRF) and hypertension risk. In this study, we performed a meta-analysis to investigate the categorical and dose-response relationship between CRF and hypertension risk and the effects of CRF changes on hypertension risk reduction. The PubMed, Web of Science, and Embase databases were searched for relevant studies. The summarized relative risk (RR) and 95% confidence interval (95% CI) were estimated using the DerSimonian and Laird random effect model, and the dose-response relationship between CRF and hypertension risk was characterized using generalized least-squares regression and restricted cubic splines. Nine cohorts describing 110,638 incident hypertension events among 1,618,067 participants were included in this study. Compared with the lowest category of CRF, the RR of hypertension was 0.63 (95% CI: 0.56-0.70) for the highest CRF category and 0.85 (95% CI: 0.80-0.91) for the moderate category of CRF. For a 1-metabolic equivalent increment in CRF, the pooled RR of hypertension was 0.92 (95% CI: 0.90-0.94) in the total population. The RR of hypertension was 0.71 (95% CI: 0.64-0.79) for participants with CRF increased compared with those whose CRF was decreased over time. In conclusion, our meta-analysis supports the widely held notion of a negative dose-dependent relationship between CRF and hypertension risk.

Entrenamiento intermitente de alta intensidad versus continuo en mujeres con hipertensión

Objetivo: comparar los efectos de la implementación de un programa de ejercicio continuo de mediana intensidad vs. un programa de ejercicio interválico de alta intensidad sobre los parámetros antropométricos y de condición física en mujeres hipertensas.Materiales y método: estudio experimental con pre y post prueba, realizado en 62 mujeres hipertensas divididas en 3 grupos: el primer grupo realizó ejercicio interválico de alta intensidad, el segundo hizo ejercicio continuo de mediana intensidad y el tercero es el grupo control. La intervención se realizó durante 12 semanas con una frecuencia semanal de 3 repeticiones. En todas las mujeres hipertensas se evaluó su condición física y características antropométricas.Resultados: posterior a la intervención, se encontraron diferencias estadísticamente significativas entre el grupo HiiT (high intensity interval training) y el grupo control en cuanto a las variables porcentaje de grasa (p = 0,014), densidad corporal (p = 0,014) e índice de conicidad [IC] (p = 0,003). Adicionalmente, se identificaron diferencias entre los dos grupos de ejercicio y el grupo control en las variables distancia recorrida (p = 0,04), flexibilidad en miembro superior derecho (p = 0,00) y fuerza en miembros inferiores (p = 0,01).Conclusiones: el estudio demostró que el ejercicio es una herramienta efectiva para mejorar la aptitud física de mujeres hipertensas. Sin embargo, no se encontraron diferencias en la efectividad entre el entrenamiento interválico de alta intensidad y el entrenamiento continuo.

Physical Activity, Sedentary Time, and Cardiovascular Disease Biomarkers at Age 60 to 64 Years

Background We examined associations of objectively measured physical activity ( PA ) and sedentary time with cardiovascular disease biomarkers at age 60 to 64 years. This included investigation of sex differences and the extent to which associations may be mediated by adiposity. Methods and Results Participants were 795 men and 827 women aged 60 to 64 years from the Medical Research Council National Survey of Health and Development. Combined heart rate and movement sensors worn for 5 consecutive days were used to derive overall PA energy expenditure, kJ /kg per day) and time spent sedentary (<1.5 metabolic equivalent of tasks), in light PA (1.5-3 metabolic equivalent of tasks) and moderate-to-vigorous intensity PA (>3 metabolic equivalent of tasks). Linear regression models were used to relate each PA parameter to inflammatory (C-reactive protein, interleukin-6), endothelial (tissue-plasminogen activator, E-selectin) and adipokine (leptin, adiponectin) markers extracted from fasting blood samples. Greater time in light PA and moderate-to-vigorous intensity PA and less sedentary time were associated with more favorable biomarker levels. For C-reactive protein, interleukin-6, and leptin, these differences were greater among women than men. For example, % differences (95% confidence intervals) in leptin for men and women per SD increases in sedentary time: 7.9 (2.7, 13.0) and 20.6 (15.3, 25.8); light intensity PA : -3.8 (-8.9, 12.7) and -17.7 (-23.1, -12.4), moderate-to-vigorous intensity PA : -12.9 (-17.9, -8.0) and -18.3 (-23.4, -13.1). Fat mass mediated a greater proportion of these associations in women than men. Conclusions Greater light PA and moderate-to-vigorous intensity PA and less sedentary time in early old age were associated with more favorable cardiovascular biomarker profiles. Fat mass partially mediated these associations but more strongly in women than men, which explained sex differences.

[Significance of hawthorn extract in general practice - a current positioning]

BACKGROUND

Traditionally, hawthorn extract has been used for preventive and curative support in mild forms of age-related cardiovascular problems. There are now solid data demonstrating pre-clinical effects and mechanisms of action on a molecular-biological and cellular level that appear to be of particular interest in influencing vascular ageing and in arterial vascular disorders.

METHOD

The review presents the results of a meeting of experts that took place to work out a current assessment of the therapeutic suitability of hawthorn extract in the treatment of cardiovascular disease.

RESULTS AND CONCLUSIONS

Although currently no general recommendation can be given on the use of hawthorn extract in cardiac insufficiency, its use is indicated for typical challenges arising in general practice, where particularly patients with functional cardiorespiratory complaints present, possibly those with cardiac insufficiency with preserved heart function for whom there has thus far been no effective therapy apart from exercise. This recommendation is supported by the findings of studies on the safety and very good tolerability of hawthorn extract, particularly for therapy adjuvant to standard practice.