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Objective:To observe the effect of a modified version of high-intensity interval training (HIIT) on the rehabilitation of persons with coronary artery disease (CAD), and to evaluate its safety and patient compliance.Methods:Sixty CAD patients were randomly divided into an exercise group and a control group, each of 30. Both groups were given conventional cardiac rehabilitation (including controlled nutrition, psychological counseling and low-intensity aerobic exercise). The exercise group additionally completed a session of HIIT twice a week for 6 weeks. Each session involved 30s of cycling at 85-90% of the patient′s maximum heart rate followed by 30s rest, repeated 15 times. The cardiorespiratory fitness, blood pressure, vascular function and body composition of both groups were documented before and after the 6 weeks. Compliance was recorded and the safety of the modified HIIT program was evaluated.Results:A significant improvement was observed in the maximum oxygen uptake and workload in a graded exercise test among the exercise group. The average blood pressure and body composition improved significantly, as did the average positive mood score and enjoyment of training. There was a significant decrease in negative mood and anxiety scores among the exercise group. No significant differences were observed in the control group. Compliance with the HIIT training program of the exercise group (97.4%) was significantly better than the control group′s compliance (88.7%) with its less strenuous regimen. There were no serious adverse reactions or cardiovascular events during the experiment.Conclusion:Modified HIIT is an effective form of cardiac rehabilitation training for CAD. It is safe, and compliance is good.
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Problem: Intensity in endurance training is important for improving race time; its optimal handling in amateur runners has not been extensively studied. The polarized training intensity distribution (TID) model emerges as a possibility to reduce race time; however, effect of this model remains to be demonstrated compared to other TID models. Objective: The objective of this study is to explore the current state of the evidence and its the gaps, according to the effect of the polarized TID model on race time in amateur runners compared to other TID models. Method: A scoping review without date restrictions was carried out in PubMed, EBSCO, SciELO, LILACS, and Google Scholar. Randomized controlled studies, quasi-experimental studies, and case studies, which comprise polarized TID model in amateur runners on race time, were include. Results: Five studies evaluated the effect on running time using the polarized TID model compared to other models in amateur runners; four of them did not show differences between groups in the race times in two, five, and ten km. Only one study showed significant diferences in the race time at 21 km. Conclusions: The model with polarized TID did not show significant differences in race time compared to other models, except for a case report in which the polarized TID was higher by 21 km compared to the threshold TID: 1 hour. 20 min. 22 seconds and 1 hour. 26 min. 34s, respectively. The scarce evidence found, the heterogeneity in the distances in the evaluated race time, the distribution of zones in the same TID, the duration of the interventions, and the monitoring of the loads, are the main limitations found in the studies. The polarized TID could contribute to adherence, lower perception of effort, and injury prevention. However, this must be tested in future studies.
Problema: La intensidad en el entrenamiento de la resistencia es importante para mejorar el tiempo de carrera; su manipulación óptima en corredores recreativos no ha sido estudiada ampliamente. El modelo de distribución de intensidad del entrenamiento (DIE) polarizado emerge como posibilidad para reducir el tiempo de carrera. Sin embargo, falta demostrar su efecto comparado con otros modelos de DIE. Objetivo: Explorar el estado actual de la evidencia científica y sus vacíos respecto al efecto del modelo de DIE polarizado sobre el tiempo de carrera en corredores recreativos, en comparación con otros modelos de DIE. Método: Se realizó una revisión de alcance sin restricción de fechas en PubMed, EBSCO, SciELO, LILACS y Google Scholar. Se incluyeron estudios controlados aleatorios, estudios cuasiexperimentales y estudios de caso, que tuvieran como DIE el modelo polarizado en corredores recreativos sobre el tiempo de carrera. Resultados: Cinco estudios evaluaron el efecto en el tiempo de carrera usando el modelo de DIE polarizado comparado con otros modelos en corredores recreativos; cuatro de ellos no mostraron diferencias entre grupos en los tiempos de carrera en dos, cinco y diez km. Solo un estudio mostró diferencias significativas en el tiempo de carrera en 21 km. Conclusiones: El modelo con DIE polarizado no mostró diferencias significativas en el tiempo de carrera comparado con otros modelos, a excepción de un reporte de caso en el cual la DIE polarizado fue superior en 21 km comparado la DIE umbral: 1 hora. 20 min. 22 s y 1 hora. 26 min. 34 s, respectivamente. La escasa evidencia encontrada, la heterogeneidad en las distancias en el tiempo de carrera evaluado, la distribución de zonas en una misma DIE, la duración de las intervenciones y la monitorización de las cargas son las principales limitaciones encontradas en los estudios. La DIE polarizado podría contribuir a la adherencia, a una menor percepción del esfuerzo y a la prevención de lesiones. No obstante, esto debe ser probado en estudios futuros.
Subject(s)
Exercise , Fitness Centers , Exercise Movement Techniques , Endurance Training , Perception , Running , Track and Field , High-Intensity Interval Training , ForecastingABSTRACT
Objective:To explore the early warning of blood growth differentiation factor-15 (GDF15) as a new stress indicator.Methods:A total of 53 armed police soldiers selected to participate in high-intensity training, measuring the soldiers' serum GDF15, high-sensitivity C-reactive protein (S-CRP), and C-reactive protein (CRP) before and after the high-intensity training , Interleukin-6 (IL-6), Procalcitonin (PCT) levels, compare the coefficient of variation of each index; use SPSS 24 software for statistical analysis, measurement data are expressed as mean ± standard deviation (Mean±SD), The comparison of measurement data adopts group t test. Results:The GDF15 level of fighters after high-intensity training was (176.28±97.45) pg/mL, which was higher than (120.35±69.87) pg/mL before high-intensity training. The difference was very significant ( P <0.001). After high-intensity training, IL-6 and CRP levels were lower than before high-intensity training, the difference was statistically significant ( P<0.05); there was no statistically significant difference in S-CRP and PCT before and after high-intensity training ( P>0.05). The coefficient of variation of GDF15 index is smaller than S-CRP, CRP, IL-6, PCT. Conclusion:Blood growth differentiation factor-15 (GDF15) is of great significance in warning the stress state after high-intensity training. It has higher sensitivity than other conventional stress indicators like S-CRP, CRP, IL-6 and PCT.
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Resumen Antecedente y objetivo: El cáncer es una de las enfermedades que genera mayor mortalidad en el mundo. Los programas de rehabilitación basados en ejercicios se muestran efectivos y seguros para mitigar los efectos del cáncer. El objetivo fue determinar los cambios de la fatiga asociada al cáncer de mama luego de un programa de entrenamiento de alta intensidad (HIIT), o continuo a intensidad moderada (MICT). Métodos: Ensayo clínico aleatorizado con 236 pacientes con cáncer de mama en estadio II, distribuidos en 3 grupos (MICT, HIIT y grupo control), a quienes se les aplicó la escala FACT Fatigue Scale, test de calidad de vida, ecocardiograma, prueba de esfuerzo, tolerancia y percepción nal ejercicio mediante la prueba de caminata de los 6 minutos y escala de Borg, respectivamente. El programa de entrenamiento tuvo una duración de 36 sesiones de 70 minutos, 3 veces por semana. Resultados: Luego de comparar los respectivos grupos, se evidenció cambios significativos en todas las variables de los grupos HIIT y MICT (p=<0,05 %) frente al grupo control. Además, hubo una mejoría posentrenamiento, de la fatiga asociada al cáncer de mama en el grupo HIIT (20,4±5,6 vs 5,1±3,6) y MICT (18.6±9.5 vs 8.0±4.2). Conclusiones: Estos tipos de entrenamiento mejoraron la tolerancia al ejercicio, fuerza, vo2 y sobre todo, la fatiga asociada al cáncer y la calidad de vida de las pacientes. Y el grupo control de atención habitual sin entrenamiento físico o ejercicio supervisado, no presentó cambios significativos ni mejoras en la fatiga asociada al cáncer de mama. Trial registration: Clinicaltrials.gov NCT03915288
Abstract Background and objective: Cancer is one of the diseases that generate the highest mortality in the world. Exercise-based rehabilitation programs are effective and safe to mitigate the effects of cancer. The objective was to determine the changes in fatigue associated with breast cancer after a highintensity training program (HIIT), or a continuous training at moderate intensity (MICT). Methods: Randomized clinical trial with 236 patients with stage II breast cancer, distributed in 3 groups (MICT, HIIT, and control group), to whom the FACT-Fatigue Scale and quality of life test were applied and an effort echocardiogram was performed. Tolerance, and perception of the exercise were evaluated through the test of walk of the 6 minutes and scale of Borg respectively. The training program lasted 36 sessions of 70 minutes, 3 times per week. Results: After comparing the respective groups, significant changes were evident in all the variables of the HIIT and MICT groups (p = <0.05%) compared to the control group. Also, there was a postworkout improvement of fatigue associated with breast cancer in the HIIT group (20.4 ± 5.6 vs. 5.1 ± 3.6) and MICT (18m6 ± 9m5 vs. 8m0 ± 4m2). Conclusions: These types of training improved exercise tolerance, strength, VO2 and, above all, cancer-associated fatigue and patients quality of life. The usual care control group without physical training or supervised exercise did not show significant changes or improvements in fatigue associated with breast cancer. Trial registration: Clinicaltrials.gov NCT03915288
Subject(s)
Humans , Breast Neoplasms , Exercise , Exercise Therapy , Fatigue/rehabilitation , High-Intensity Interval Training , Endurance TrainingABSTRACT
Obesity and fitness have been identified as key health concerns among USA firefighters yet little is known about the current habits related to exercise and diet. In particular, high-intensity training (HIT) has gained increasing popularity among this population but limited quantitative data are available about how often it is used and the relationship between HIT and other outcomes. Using survey methodology, the current study evaluated self-reported HIT and diet practice among 625 male firefighters. Almost one-third (32.3%) of participants reported engaging in HIT. Body composition, as measured by waist circumference and percentage body fat, was significantly related to HIT training, with HIT participants being approximately half as likely to be classified as obese using body fat [odds ratio (OR) = 0.52, 95% confidence interval (CI) = 0.34-0.78] or waist circumference (OR = 0.61, 95% CI = 0.37-0.98). Those who engaged in HIT were more than twice as likely as those who did not (OR = 2.24, 95% CI = 1.42-3.55) to meet fitness recommendations. Findings highlight directions for future prevention and intervention efforts.