Influence Of Strength Training Research Articles

Risk of sudden cardiac death in strength training

Physical activity is a generally accepted means of primary and secondary prevention of cardiovascular diseases, but in some cases, it can be a risk factor for cardiovascular events, including sudden cardiac death (SCD). Most studies analyze the relationship of cardiovascular events with the volume and general directions of exercise. Besides, a significant part of the guidelines and studies are devoted to the effects of aerobic exercise, while the importance of anaerobic exercise remains controversial. The review analyzes works devoted to the influence of strength training, such as weightlifting, bodybuilding, powerlifting, etc., on the cardiovascular system, as well as their relationship with SCD and other cardiovascular events. The design and contingent of the analyzed papers did not allow them to be systematized correctly. Therefore, the review is largely analytical in nature.

The influence of strength training on the sports performance of athletes in rowing in the context of digitalization of society system

The work is devoted to the analysis of the importance of strength training on sports results in rowing. The important role of strength training is noted not only in the preparatory, transitional, but also in the competitive period of training. On the basis of research materials, the significance and effectiveness of strength training in the training process in rowing has been proved. It was found that athletes performing properly planned strength training show better results in rowing. The methods of planning strength training in the annual macrocycle of sports training are described.

Influence of strength training on selected systems of the human body

Research aim: The objective of research was to present the influence of strength training on selected systems of human organs on the basis of available literature on the subject. Methodology: A review was conducted of international literature based on analysis of selected articles available at Google Scholar, PubMed, SciCentral. Results: Changes in the human body as a result of both strength exercises and training were demonstrated based on analysis of the available literature. Summary: The results and the rate of benefiting from the practive of strength disciplines largely depend on gender, genetic characteristics, age, training history, health status, diet, lifestyle, current physical activity and stress levels.

The influence of prolonged strength training upon muscle and fat in healthy and chronically diseased older adults.

Physical muscle function and brain hippocampus size declines with age, accelerating after the age of 60. Strength training over a few months improves physical function, but less is known about how long-term strength training affects physical function and hippocampus volume. Therefore, we aimed to investigate the effect of 1-year strength training of two different intensities upon muscle mass, function, and hippocampus volume in retirement-age individuals. In this multidisciplinary randomized controlled trial (clinicaltrials.gov: NCT02123641), participants were allocated to either a) supervised, heavy resistance training (HRT, n=149, 3/wk), b) moderate intensity resistance training (MIT, n=154, 3/wk) or c) non-exercise activities (CON, n=148). 451 participants were randomized (62-70yrs., women 61%, ≈80% with a chronic medical disease) and 419 were included in the intention-to-treat analysis (n=143, 144 and 132; HRT, MIT and CON). Changes in muscle power (primary outcome), strength and size, physical function, body composition, hippocampus volume and physical/mental well-being were analyzed. Of the participants (HRT+MIT), 83% completed training at least 2/week. Leg extensor power was unchanged in all groups, but strength training had a positive effect on isometric knee extensor strength in both groups, whereas an increased muscle mass, cross-sectional area of vastus lateralis muscle, a decreased whole-body fat percentage, visceral fat content and an improved mental health (SF-36) occurred in HRT only. Further, chair-stand performance improved in all groups, whereas hippocampus volume decreased in all groups over time with no influence of strength training. Together, the results indicate that leg extensor power did not respond to long-term supervised strength training, but this type of training in a mixed group of healthy and chronically diseased elderly individuals can be implemented with good compliance and induces consistent changes in physiological parameters of muscle strength, muscle mass and abdominal fat.

Spirulina Platensis Supplementation Coupled to Strength Exercise Improves Redox Balance and Reduces Intestinal Contractile Reactivity in Rat Ileum.

The blue alga Spirulina platensis has presented several pharmacological activities, highlighting its actions as an anti-inflammatory and antioxidant. In addition, there are few studies with the influence of strength training on physiological parameters, as intestinal contractility and oxidative cell damage. We evaluated the influence of S. platensis supplementation, strength training, and its association on contractile reactivity of rat ileum, as well as the balance of oxidative stress/antioxidant defenses. Methods: Male Wistar rats were divided into; sedentary (S); S + supplemented with algae at 50 (S50), 150 (S150), and 500 mg/kg (S500); trained (T); and T + supplemented (T50, T150, and T500). Contractile reactivity was analyzed by kymographs; oxidative stress on ileum by the malondialdehyde (MDA) formation; and the antioxidant capacity by 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. S. platensis supplementation reduced the reactivity of rat ileum to carbachol (CCh) and KCl, while training reduced only the CCh efficacy. In addition, association potentiated the reduction on contractile reactivity. Supplementation reduced the oxidative stress and increased oxidation inhibition; training alone did not alter this parameter, however association potentiated this beneficial effect. Therefore, this study demonstrated that both supplementation and its association with strength training promote beneficial effects regarding intestinal contractile reactivity and oxidative stress, providing new insights for intestinal disorders management.

Influence of strength training and multicomponent training on the functionality of older adults: systematic review and meta-analysis

Physical exercise is an important option to maintain functional independence in older adults, however, it is not clear which type of exercise is the most benefic: strength or multicomponent. The objective was to verify the effectiveness of strength training and multicomponent training on functionality of healthy older patients through a systematic review with meta-analysis. Registration number: CRD42017071887. Two independent evaluators searched Pubmed, Web of Science, PEDro, Cochrane and Lilacs databases. Of the 1,434 studies found, 32 clinical trials that investigated the effects of strength training only and/or combined with other modalities (multicomponent) in older adults and evaluated the Timed up and Go (TUG), sit-to-stand (STS) and/or Berg Balance Scale (BBS were included. The methodological quality was evaluated with the Downs & Black scale. Data analysis was performed with the Software Review Manager. It was verified improvement in all the investigated outcomes when performing multicomponent training in comparison to control groups. Strength training, compared to control groups, showed benefit only for sit to stand test. Studies comparing the two trainings found no difference between them. The not high average score in the methodological quality assessment of the included studies is a limitation of the present study. In conclusion, both types of training were effective to improve functionality and are good strategies of training for older individuals. However, as the comparison between the two types of training was performed in few studies, it is not possible to infer which is more effective for the functionality, suggesting the realization of new clinical trials.

Influence of strength training and multicomponent training on the functionality of older adults: systematic review and meta-analysis

Abstract Physical exercise is an important option to maintain functional independence in older adults, however, it is not clear which type of exercise is the most benefic: strength or multicomponent. The objective was to verify the effectiveness of strength training and multicomponent training on functionality of healthy older patients through a systematic review with meta-analysis. Registration number: CRD42017071887. Two independent evaluators searched Pubmed, Web of Science, PEDro, Cochrane and Lilacs databases. Of the 1434 studies found, 32 clinical trials that investigated the effects of strength training only and/or combined with other modalities (multicomponent) in older adults and evaluated the Timed up and Go (TUG), sit-to-stand (STS) and/or Berg Balance Scale (BBS were included. The methodological quality was evaluated with the Downs & Black scale. Data analysis was performed with the Software Review Manager. It was verified improvement in all the investigated outcomes when performing multicomponent training in comparison to control groups. Strength training, compared to control groups, showed benefit only for sit to stand test. Studies comparing the two trainings found no difference between them. The not high average score in the methodological quality assessment of the included studies is a limitation of the present study. In conclusion, both types of training were effective to improve functionality and are good strategies of training for older individuals. However, as the comparison between the two types of training was performed in few studies, it is not possible to infer which is more effective for the functionality, suggesting the realization of new clinical trials.

THE EFFECT OF MUSCLE DAMAGE AND THE IL-6-174C/G POLYMORPHISM ON THE SERUM IL-6 LEVELS OF OLDER MEN

ABSTRACT Introduction Fast population aging is a global reality. Today’s major challenge is to promote the healthy aging of more and more people by acting on factors that can be modified, such as physical exercise. Regular exercise could contribute to the prevention of chronic diseases associated with aging. Research has been conducted on the physical training response of elderly individuals, but there is not yet any consensus on the influence of strength training or IL-6 polymorphism on levels of inflammatory markers such as IL-6 and muscle damage marker CK, particularly in healthy elderly male individuals. Objectives The aim of this study was to evaluate the relationship of IL-6 promoter -174 C/G gene polymorphism on systemic IL-6 responses and muscle damage after eccentric strength training in elderly men. Methods This is a prospective, high-quality study. Gene frequency of polymorphism of promoter gene IL6 G-174C was identified using the Hardy-Weinberg test in 28 older male volunteers. The relationships of each genotype with IL-6 and CK serum levels were analyzed. CK and IL-6 levels were determined at pre-training and 0h, 3h, 24h, and 48h post-training periods. Results Differences in baseline and post-training IL-6 levels of genotypic groups were observed for all time periods analyzed (p = 0.029). Eccentric exercise efficiently reduced post-intervention muscle damage, thus showing a statistical difference between the pre- and post-intervention time points ( p = <0.0005). Conclusion Eccentric training influenced CK and IL-6 modulation independently of the polymorphism of the IL-6 promoter gene -174 C/G. Level of evidence II, Prospective comparative type.

The Influence of Prolonged Strength Training Upon Muscle and Fat in Healthy and Chronically Diseased Elderly Close to Retirement Age

Background: Physical and cognitive function declines with age, accelerating after the age of 60. Strength training over a few months improves physical function, but less is known about how long-term strength training affects physical and cognitive function. Therefore, we aimed to investigate the effect of 1 year strength training of two different intensities upon muscle mass, function, and cognition in retirement-age individuals. Methods: In this randomized controlled trial (clinicaltrials.gov: NCT02123641), participants were allocated to either a) supervised, heavy resistance training (HRT, n=149, 3/wk), b) moderate intensity resistance training (MIT, n=154, 3/wk) or c) non-exercise activities (CON, n=148). 451 participants were randomized (62-70 yrs, women 61%, ≈80% with a chronic medical disease) and 419 were included in the intention-to-treat analysis (n=143, 144 and 132; HRT, MIT and CON). Changes in muscle power (primary outcome), strength and size, physical function, body composition, hippocampus volume and physical/mental well-being were analysed. Findings: Of the participants (HRT+MIT), 83% completed training at least 2/wk. Leg extensor power was unchanged in all groups, but strength training had positive effects on isometric knee extensor strength and muscle mass, whereas an increased cross-sectional area of vastus lateralis muscle, a decreased whole-body fat percentage and visceral fat content occurred in HRT only. Further, chair-stand performance and 400 m walking time improved in all groups. Hippocampus volume decreased in all groups over time with no influence of strength training, whereas mental health (SF-36) improved more in HRT than MIT. Interpretation:Together, the results indicate that long-term supervised strength training in both healthy and chronically diseased elderly individuals can be implemented with good compliance and induces consistent changes in physiological parameters of muscle and fat. Trial Registration: Clinicaltrials.gov (NCT02123641). Funding Statement: Nordea Foundation (Centre for Healthy Ageing grant). Declaration of Interests: Dr. Gylling reports grants from Nordea Foundation (Centre for Healthy Ageing grant), during the conduct of the study. All other authors declare no conflicts of interest. Ethics Approval Statement: All participants signed an informed consent before participating in the study. The study was approved by the regional ethical committee (Capital Region, Copenhagen, Denmark, No. H-3-2014-017), and complied with the declaration of Helsinki, and the study was approved by the Danish Data Protection Agency.

Influence of strength training on variables related to elderly autonomy

The process of aging results in several changes in the organisms, thus, is necessary to search for ways to mitigate the negative effects of this involution process, for this, knowing that the strength improvement represents a greater availability for everyday activities, this study searched at strength training, evidence of possible improvements in variables related to elderly autonomy. Before and after 12 weeks of training, we performed a pre and post-assessment respectively, in which were measured anthropometric variables as body weight, height, body mass index, waist and hip circumference, waist-hip ratio and fat. We also performed a strength test with hand-held and lower-limb dynamometers, besides functional capacity tests as climbing stairs and self-perception performance in activities of daily living. The sample consisted of 12 elderly females without any type of strength training. The results showed a significant improvement in strength and functional capacity, there was also significant reduction of fat, and increase of lean body mass. Concluding, elderly people can enjoy the benefits provided by strength training, especially in autonomy perspective.

Influence of strength training on cardiac risk prevention in individuals without cardiovascular disease

It has widely been shown that exercise, particularly aerobic exercise, has extensive cardioprotective benefits and is an important tool in the prevention of coronary heart disease (CHD). The present investigation aimed to determine the multivariate impact of strength training, designed to prevent the development of CHD, on the Framingham Risk Assessment (FRA) score. Twenty-eight healthy untrained men with low CHD risk (mean age 28 years and 7 months) participated in an eight-week (3-d/wk) strength training programme. Self-administered smoking records, resting blood pressures, total cholesterol (TC), high-density lipoprotein cholesterol (HDLC), FRA scores and absolute 10-year risks for CHD were determined at the pre-test and post-test. After the eight-week period, no significant (p > 0.05) differences were found in number of cigarettes smoked daily, systolic blood pressure, TC, HDLC, FRA scores and absolute 10-year risks for CHD in both the strength-trained (n = 13) and non-exercising control (n = 15) groups. The data indicate that strength training did not reduce the risk of developing CHD and absolute 10-year risk for CHD as assessed by the FRA score.

Influence of Strength Training on Adult Women's Flexibility

The purpose of the current study was to investigate the effect of 10 weeks of strength training on the flexibility of sedentary middle-aged women. Twenty women were randomly assigned to either a strength training group (n = 10; age, 37 +/- 1.7 years; body mass, 65.2 +/- 10.7 kg; height, 157.7 +/- 10.8 cm; and body mass index, 25.72 +/- 3.3 kg x m(-2)) or a control group (n = 10; age, 36.9 +/- 1.2 years; body mass, 64.54 +/- 10.18 kg; height, 158.1 +/- 8.9 cm; and body mass index, 26.07 +/- 2.8 kg x m(-2)). The strength training program was a total body session performed in a circuit fashion and consisted of 7 exercises performed for 3 circuits of 8 to 12 repetitions maximum (RM), except for the abdominal exercise which was performed for 15 to 20 RM. Flexibility measurements were taken for 10 articulation movements pre and post training: shoulder flexion and extension, shoulder horizontal adduction and abduction, elbow flexion, hip flexion and extension, knee flexion, and trunk flexion and extension. Pre and post training, 10 RM strength significantly increased (p < 0.05). Of the movements examined, only shoulder horizontal adduction, hip flexion and extension, and trunk flexion and extension demonstrated significant increases (p < 0.05). Neither elbow nor knee flexion showed a significant change with weight training. The control group showed no significant change in any of the flexibility measures determined. In conclusion, weight training can increase flexibility in previously sedentary middle-aged women in some, but not all joint movements.

Efficiency of vibration exercise for glycemic control in type 2 diabetes patients

Although it is well documented that persons suffering from diabetes type 2 profit from muscular activities, just a negligible amount of patients take advantage of physical exercises. During the last decade, vibration exercise (VE) could be established as an effective measure to prevent muscular atrophy and osteoporosis with low expenditure of overall exercise-time. Unfortunately, little is known about the metabolic effects of VE. In the present study we compared VE with the influence of strength training and a control group (flexibility training) on glycemic control in type 2 diabetes patients. Forty adult non-insulin dependent patients participated in the intervention. Fasting glucose concentration, an oral glucose tolerance test (OGTT), haemoglobin A1c (HbA1c), the isometric maximal torque of quadriceps muscles, and endurance capacity were evaluated at baseline and after 12 weeks of training with three training sessions per week. The main findings are: Fasting glucose concentrations remind unchanged after training. The area under curve and maximal glucose concentration of OGTT were reduced in the vibration and strength training group. HbA1c values tended to decrease below baseline date in the vibration training group while it increased in the two other intervention groups. Theses findings suggest that vibration exercise may be an effective and low time consuming tool to enhance glycemic control in type 2 diabetes patients.

EFFECTS OF STRENGTH TRAINING ON KNEE JOINT MECHANICS AND BALANCE DURING A SINGLE LEG SQUAT TASK IN PATIENTS WITH KNEE OSTEOARTHRITIS

Introduction Strengthening exercises are commonly prescribed for patients with knee arthritis with the idea that the stability of the knee will be improved. While patients report positive outcomes associated with such exercise training, little is know about the influence of strength training on knee joint mechanics. These results represent preliminary findings of a clinical trial testing the influence of knee strengthening on knee joint biomechanics.

Influence of strength training on sprint running performance. Current findings and implications for training.

Today, it is generally accepted that sprint performance, like endurance performance, can improve considerably with training. Strength training, especially, plays a key role in this process. Sprint performance will be viewed multidimensionally as an initial acceleration phase (0 to 10 m), a phase of maximum running speed (36 to 100 m) and a transition phase in between. Immediately following the start action, the powerful extensions of the hip, knee and ankle joints are the main accelerators of body mass. However, the hamstrings, the m. adductor magnus and the m. gluteus maximus are considered to make the most important contribution in producing the highest levels of speed. Different training methods are proposed to improve the power output of these muscles. Some of them aim for hypertrophy and others for specific adaptations of the nervous system. This includes general (hypertrophy and neuronal activation), velocity specific (speed-strength) and movement specific (sprint associated exercises) strength training. In developing training strategies, the coach has to keep in mind that strength, power and speed are inherently related to one another, because they are all the output of the same functional systems. As heavy resistance training results in a fibre type IIb into fibre type IIa conversion, the coach has to aim for an optimal balance between sprint specific and nonspecific training components. To achieve this they must take into consideration the specific strength training demands of each individual, based on performance capacity in each specific phase of the sprint.

The influence of strength training, swim training and ageing on the Achilles tendon and m. soleus of the rat.

Different age groups of male Wistar rates were submitted to intense strength training, swim training or no training. It was found that the tetanic of the m. soleus decreased with age. This was counteracted by strength training, whereas swim training had no effect on tetanic tension. Force at ultimate failure and yield point in the Achilles tendon decreased with age, but were not influenced by strength training. Swim training, on the other hand, appeared to compensate for the ageing process in the tendon. We conclude that tendon strength decreases with age and that tendon strength does not reflect muscle strength. The absolute tensile strength of tendons appears to be influenced by physical activity of endurance-type exercise. However, it is not known whether the tissue responds to the number of mechanical muscle contractions or physiological factors connected with endurance training. Although it is questionable to extrapolate from the rat to humans, it is speculated that intensive muscle strength training should be accompanied by endurance exercise in order to prevent the muscles from damaging connective tissue structures, such as the tendons and ligaments.

Alterations of mechanical characteristics of human skeletal muscle during strength training.

To investigate the influence of strength training on the mechanical characteristics of human skeletal muscle, 14 male subjects went through training of combined heavy concentric and eccentric contractions three times a week for 16 weeks. The strength training program consisted mainly of dynamic exercises for leg extensors with loads of 80 to 120% of one maximum repetition. The force-time curves produced during various vertical jumps were the basis for calculation of various mechanical parameters. In addition to a great increase (p less than 0.001) in maximal isometric force, heavy resistance strength training also caused significant (p less than 0.05-0.01) increases in heights and in various mechanical parameters in positive work phases of vertical and drop jumps. The increase in positive force during a fast dynamic contraction was correlated (p less than 0.01) with the reduced time to produce a certain submaximal force level in isometric condition. No changes in the elastic properties of the muscle were observed as judged from the difference between the counter-movement and squat jumps. When the training was followed by the 8-week detraining period a great decrease (p less than 0.001) in maximal force took place, but only minor changes (ns) were observed in fast force production.

Influence of Strength Training on Pre-Tensed and Free-Arm Speed

Abstract During a period of 12 weeks, 26 college men participated in an isotonic-isometric training program. Pre-training static strength, pre-tensed static strength and speed, and free arm speed were recorded. Following the strength training program, significant increases were recorded in static arm strength and in free and pre-tensed speeds of movement. Very low relationships were found between the pre- and post-training strengths and speeds.