The Application of DOMS Mechanism and Prevention in Physical Education and Training

To analyze the causes of muscle soreness and injury during precompetition training in university sports meet and taking the DOMS mechanism as the main line to find a reasonable way to deal with the muscle pain and prevent the injury, 125 college students participating in stadium games training were randomly selected. The muscle pain and injury during the training were obtained through interviews, mathematical statistics, and literature review. The information of exercise load, pain and injury type, exercise ability, pain degree, and recovery time was comprehensively analyzed to study the mechanism of pain and injury formation. Muscle pain and injury occurred in precompetition training, especially in freshmen. After heavy load, muscle soreness occurred, causing DOMS and developing into muscle injury. Affected by the external climate environment, sudden muscle soreness and injury are a gradual transformation process with DOMS as the boundary, which is the comprehensive result of exercise load, water, energy, and material metabolism; control load intensity, water supplement, and energy and material supplement can effectively prevent the occurrence of DOMS, and timely recovery after DOMS symptoms can effectively avoid the occurrence of sports injury. According to the different intensity of exercise, it is of great significance to clarify the mechanism of DOMS and explore effective prevention methods for physical education and sports training.

Cardiovascular Metrics Associated With Prevention of Aging-Related Parkinsonian Signs Following Exercise Intervention in Sedentary Older Rats

Preservation of motor capabilities is vital to maintaining independent daily living throughout a person's lifespan and may mitigate aging-related parkinsonism, a progressive and prevalent motor impairment. Physically active lifestyles can mitigate aging-related motor impairment. However, the metrics of physical activity necessary for mitigating parkinsonian signs are not established. Consistent moderate intensity (~10 m/min) treadmill exercise can reverse aging-related parkinsonian signs by 20 weeks in a 2-week on, 2-week off, regimen in previously sedentary advanced middle-aged rats. In this study, we initiated treadmill exercise in sedentary 18-month-old male rats to address two questions: (1) if a rest period not longer than 1-week off exercise, with 15 exercise sessions per month, could attenuate parkinsonian signs within 2 months after exercise initiation, and the associated impact on heart rate (HR) and mean arterial pressure (MAP) and (2) if continuation of this regimen, up to 20 weeks, will be associated with continual prevention of parkinsonian signs. The intensity and frequency of treadmill exercise attenuated aging-related parkinsonian signs by 8 weeks and were maintained till 23 months old. The exercise regimen increased HR by 25% above baseline and gradually reduced pre-intervention MAP. Together, these studies indicate that a practicable frequency and intensity of exercise reduces parkinsonian sign severity commensurate with a modest increase in HR after exercise. These cardiovascular changes provide a baseline of metrics, easily measured in humans, for predictive validity that practicable exercise intensity and schedule can be initiated in previously sedentary older adults to delay the onset of aging-related parkinsonian signs.

Paradigm of Village Physical Activity During Pandemic

One of the measures to maintain body immunity in the midst of the Covid-19 pandemic is to exercise regularly. The Covid-19 virus was officially declared to have entered Indonesia by the central government since March 2020. The purpose of this research was to find out the differences in the paradigm of physical activity of the residents of Dusun XI, Pond Village, especially those aged 17 years and over, between before the Covid-19 pandemic. 19 and during the Covid-19 pandemic. The research used in the preparation of this scientific article uses quantitative methods which are presented in descriptive form. The paradigm of sports activities for the residents of Dusun XI, Pond Village, which was studied by researchers on a one-week scale, was the intensity of sunbathing, duration of sunbathing, intensity of exercise, duration of exercise, and type of exercise. The research instrument used to measure the physical activity paradigm of residents is the Short-Form version of the Physical Activity Question (PAQ), which is filled out by 50 residents via Google Form. The answers to the questions in the questionnaire which were filled out by the residents of Dusun XI, Pond Village, are the conclusions of this scientific article. The results showed that the paradigm of residents' physical activity that changed after the Covid-19 pandemic was the intensity of sunbathing, the intensity of exercise, and the type of exercise. The Covid-19 pandemic has caused the majority of the residents of Dusun XI of the Pool Village to increase their sunbathing intensity to every day, the majority of the residents of Dusun XI of the Pool Village have decreased their exercise intensity to once a week,

The Pattern of Affective Responses to Dance-Based Group Exercise Differs According to Physical Fitness, as Measured by a Smartwatch

The present study investigated the effect of a dance-based aerobic exercise, on the affective experiences of participants with different fitness levels. Thirty-two college students were enrolled in the same dance fitness course, tested using a physical fitness test (the National Fitness Project 100) and grouped accordingly to 15 sports majors (high-fit group) and 17 non-sports majors (low-fit group). Together, they participated in a single-session dance fitness program using 11 basic dance steps incorporated in Zumba rhythms of merengue and reggaeton for 47 min including warm-up and cool-down. Pre- and post-exercise affects were measured using the PANAS-X transmitted to each participant’s smartphone. During exercise, participants’ heart rate (HR) and their responses to the felt arousal scale (FAS) and the feeling scale (FS) by exercise section were measured using tailor-made applications on a smartwatch. Results showed that the intensity of exercise for the same exercise program was lower in the high-fit group than in the low-fit group, as evidenced by %HRmax. In addition, the pattern of affective change throughout the exercise sections was different according to the groups’ fitness levels, while the affective improvement was greater in the high-fit group. This study confirmed that physical fitness is a major variable influencing the relationship between exercise and affect.

Relación entre el tipo de ejercicio físico y la fatiga cuantificada mediante VFC, CK y el lactato en sangre (Relationship between physical exercise type and fatigue quantified through HRV, CK, and blood lactate)

Los atletas son expuestos a cargas de alta intensidad en la búsqueda del rendimiento deportivo, sin embargo, sus efectos no se evalúan apropiadamente. El presente estudio analiza los efectos de cuatro diferentes tipos de ejercicios sobre la variabilidad de la frecuencia cardíaca (VFC), diagrama de Poincaré (SD1: desviación estándar 1 y SD2: desviación estándar 2), así como la Creatina Cinasa (CK) y las concentraciones de lactato en sangre como marcadores de fatiga. Para lograr el objetivo, participaron 10 voluntarios sanos quienes se expusieron a fatiga mediante protocolos de ejercicio isotónicos, isométricos, aeróbicos y anaeróbicos. Se tomaron muestras de la SD1 y de la SD2 para posteriormente probar el comportamiento de la fatiga mediante el índice de estrés (SS) como parámetro simpático, y el índice simpático/parasimpático (S/PS), además se midió la raíz cuadrada media de las diferencias sucesivas (rMSSD) como indicadores parasimpáticos. Se recolectaron muestras sanguíneas al comienzo y al final de cada uno de los tipos de ejercicio para determinar los niveles de CK y lactato. La SD1 disminuye en cada protocolo de ejercicio, mientras que el SS y el S/PS incrementan. Lactato y CK incrementan al final de cada protocolo y correlacionan positivamente con el SD1 y S/PS. La VFC, CK y lactato son marcadores sensibles para la detección de fatiga, son sensibles tanto al tipo, duración e intensidad del ejercicio, siendo la VFC un marcador no invasivo y novedoso, simple y útil para los entrenadores y atletas. Abstract: Athletes are exposed to high-intensity loads to promote athletic performance, however, the effects are not evaluated appropriately. This study investigates the effects of four types of exhaustion exercises on Heart Rate Variability (HRV) and Poincaré features (SD1: Standard deviation 1and SD2: Standard deviation 2), Creatine Kinase (CK) and blood lactate concentrations as biomarkers of fatigue. To achieve this purpose, 10 healthy volunteers were exposed to exhaustive exercise using isotonic, isometric, aerobic and anaerobic fatigue protocols. HRV Poincaré features, standard deviation of instantaneous beat-to-beat R-R interval variability (SD1) and standard deviation of continuous long-term R-R interval variability (SD2) variables were collected. Fatigue was tested through the sympathetic stress index (SS), the index sympathetic/parasympathetic index (S/PS) and the root Mean Square of the Successive Differences (rMSSD) as parasympathetic index. Blood samples were collected at the beginning and at the end of the exercises to determine CK and lactate. The SD1 decreased in each exercise protocol, while the SS and S/PS increased. Lactate and CK increased at the end of each protocol and correlated with SD1 and S/PS. HRV, CK, and lactate are acute markers to detect fatigue, are sensitive to the type, duration, and intensity of exercise, being HRV a novel noninvasive marker, simple and useful for sports coaches and athletes.

NAFLD and Physical Exercise: Ready, Steady, Go!

Along with the increase in obesity and type 2 diabetes, the non-alcoholic fatty liver disease (NAFLD) incidence is escalating, thus becoming a leading cause of liver cirrhosis and a significant burden of liver-related outcomes. Since there is no pharmacotherapy available to address the NAFLD, the most effective solutions seem to be lifestyle changes centered on physical activity. Exercise could mediate its beneficial effects directly on the liver and indirectly via extrahepatic pathways, forming a dose-response relationship with NAFLD in terms of prevalence and disease severity. Health-enhancing physical activity (HEPA) levels are mainly needed to exert beneficial effects in obese subjects, while even a small amount of exercise can be beneficial for lean individuals to prevent NAFLD. This mini-review addresses three major points regarding physical activity and NAFLD: prevention, treatment, and extrahepatic benefits, offering recommendations on type and intensity of exercise in liver disease.

The complex relationship between physical activity and diabetes: an overview

Diabetes mellitus (DM) is a widespread condition, representing a challenging disease to manage. Exercise is being increasingly recommended as part of the therapeutic regimen for DM but the management of different forms of physical activity is difficult for individuals with diabetes, trainers, and physicians. Regular exercise can improve health and well-being, helping individuals to achieve their target lipid profile, body composition, cardio-respiratory fitness, and glycemic goals. People with diabetes tend to be as inactive as the general population, with a large percentage of individuals not achieving the minimum amount of recommended physical activity levels. Indeed, several barriers to exercise exist for persons with diabetes, including sports eligibility, multi-modality management of diabetic athletes, and inadequate knowledge about adequate type and intensity of exercise. The aim of the present review is to provide the current understanding of mechanisms, recommendations, and beneficial effects of different modalities of exercise for the treatment of DM.

A Data-Driven Approach to Physical Fatigue Management Using Wearable Sensors to Classify Four Diagnostic Fatigue States

Physical exercise contributes to the success of rehabilitation programs and rehabilitation processes assisted through social robots. However, the amount and intensity of exercise needed to obtain positive results are unknown. Several considerations must be kept in mind for its implementation in rehabilitation, as monitoring of patients’ intensity, which is essential to avoid extreme fatigue conditions, may cause physical and physiological complications. The use of machine learning models has been implemented in fatigue management, but is limited in practice due to the lack of understanding of how an individual’s performance deteriorates with fatigue; this can vary based on physical exercise, environment, and the individual’s characteristics. As a first step, this paper lays the foundation for a data analytic approach to managing fatigue in walking tasks. The proposed framework establishes the criteria for a feature and machine learning algorithm selection for fatigue management, classifying four fatigue diagnoses states. Based on the proposed framework and the classifier implemented, the random forest model presented the best performance with an average accuracy of ≥98% and F-score of ≥93%. This model was comprised of ≤16 features. In addition, the prediction performance was analyzed by limiting the sensors used from four IMUs to two or even one IMU with an overall performance of ≥88%.

The Effect of Type, Duration and Intensity of Exercise on Inflammatory Markers CRP, IL-6 and IL-18 in Metabolic Syndrome Patients: A Systematic Review

Metabolic syndrome (MetS) has become a major clinical challenge worldwide due to rise of urbanisation, surplus energy intake, increasing obesity and sedentary lifestyle. C-reactive protein (CRP), interleukin-6 (IL-6) and interleukin-18 (IL-18) are associated with MetS. We performed a systematic review to investigate the effects of exercise on these markers in MetS patients and therefore to determine the best exercise regime for them. We searched Medline (Pubmed and Ovid), Scopus and CINAHL databases. The searches were standardized by using the same search strategy which included the terms such as ‘metabolic syndrome’, ‘CRP’, ‘IL-6’, ‘IL-18’ and ‘exercise’. Only clinical human studies published from Jan 2007 to May 2018 were included. A total of 11 clinical trials (466 participants) were selected. Majority of the studies were randomized controlled studies (90.9%). All studies showed a decrease in serum levels of the biomarkers. However, not all were statistically significant. The main type of exercise in most of the studies was aerobic. Aerobic-resistance exercise was more effective rather than aerobic alone, but aerobic exercise was the only effective as a sole intervention. Aerobic exercise showed promising role as the main lifestyle intervention in MetS. It is concluded that patients with MetS should have combined aerobic-resistance exercise.