segunda-feira, 25 de março de 2013

Is Long Duration Aerobic Exercise Necessary for Anaerobic Athletes?


Murach, Kevin A. MS; Bagley, James R. MS; Pfeiffer, Charles J. Jr CSCS



LONG DURATION AEROBIC EXERCISE HAS LONG BEEN A STAPLE OF TRAINING PROGRAMS FOR BOTH AEROBIC AND ANAEROBIC ATHLETES. WITHOUT QUESTION, THIS MODE OF TRAINING HAS THE POTENTIAL TO INDUCE NUMEROUS PHYSIOLOGICAL BENEFITS WHICH ENHANCE METABOLIC AND CARDIOVASCULAR PERFORMANCE. HOWEVER, MUCH DEBATE EXISTS OVER WHETHER OR NOT ANAEROBIC ATHLETES ARE ABLE TO ACHIEVE THESE SAME ADAPTATIONS THROUGH OTHER FORMS OF EXERCISE. THIS QUESTIONS THE NECESSITY OF LONG DURATION AEROBIC EXERCISE FOR THESE ATHLETES. THE FOLLOWING COLUMN WILL ARGUE FOR (PRO) AND AGAINST (CON) THE NEED FOR ANAEROBIC ATHLETES TO ENGAGE IN LONG DURATION AEROBIC EXERCISE.

http://journals.lww.com/nsca-scj/Abstract/publishahead/Is_Long_Duration_Aerobic_Exercise_Necessary_for.99629.aspx

quarta-feira, 20 de março de 2013

Exercise and 24-h Glycemic Control: Equal Effects for All Type 2 Diabetes Patients?


VAN DIJK, JAN-WILLEM1; MANDERS, RALPH J. F.1; CANFORA, EMANUEL E.1; MECHELEN, WILLEM VAN2; HARTGENS, FRED3; STEHOUWER, COEN D. A.4; VAN LOON, LUC J. C.1



Abstract

Purpose: We assessed the effect of a single bout of moderate-intensity exercise on subsequent 24-h glycemic control in 60 type 2 diabetes patients. Moreover, we examined whether individual responses to exercise were related to subjects’ baseline characteristics, including age, body mass index, diabetes duration, exercise performance, medication, and HbA1c content.
Methods: Sixty type 2 diabetes patients (insulin-treated, n = 23) participated in a randomized crossover experiment. Patients were studied on two occasions for 3 d under strict dietary standardization but otherwise free-living conditions. Parameters of glycemic control (means [95% confidence interval]) were assessed by continuous glucose monitoring over the 24-h period after a single bout of moderate-intensity endurance-type exercise or no exercise at all (control).
Results: Type 2 diabetes patients experienced hyperglycemia (blood glucose >10 mmol·L−1) for as much as 8:16 h:min (6:44 to 9:48 h:min) per day. The prevalence of hyperglycemia was reduced by 31% to 5:38 h:min (3:17 to 7:00 h:min) over the 24-h period after the exercise bout (P < 0.001). Moreover, exercise lowered average blood glucose concentrations by 0.9 mmol·L−1 (0.7 to 1.2) and reduced glycemic variability (P < 0.05). The response to exercise showed considerable variation between subjects and correlated positively with HbA1c levels (r= 0.38, P < 0.01). Nevertheless, even well-controlled patients with an HbA1c level below 7.0% (n = 28) achieved a 28% reduction in the daily prevalence hyperglycemia after exercise (P < 0.01).
Conclusions: A single bout of moderate-intensity exercise substantially improves glycemic control throughout the subsequent day in insulin- and non–insulin-treated type 2 diabetes patients. Of all baseline characteristics, only subjects’ HbA1c level is related to the magnitude of response to exercise. Nevertheless, the present study demonstrates that even well-controlled patients benefit considerably from the blood glucose-lowering properties of daily exercise.

http://journals.lww.com/acsm-msse/Fulltext/2013/04000/Exercise_and_24_h_Glycemic_Control___Equal_Effects.4.aspx

High-Speed Resistance Training in Elderly People: A New Approach Toward Counteracting Age-Related Functional Capacity Loss


Marques, Mário C. PhD; Izquierdo, Mikel PhD; Pereira, Ana PhD


STRENGTH AND HIGH-VELOCITY MOVEMENTS ARE 2 ESSENTIAL CONDITIONS IN AGING HEALTH IMPROVEMENT AND MAINTENANCE. THIS ARTICLE PROVIDES A NEW APPROACH AND STRATEGIES FOR DEVELOPMENT OF STRENGTH AND POWER IN ELDERLY POPULATION
http://journals.lww.com/nsca-scj/Abstract/publishahead/High_Speed_Resistance_Training_in_Elderly_People__.99632.aspx

sexta-feira, 15 de março de 2013

The Role of the Pediatric Exercise Specialist in Treating Exercise Deficit Disorder in Youth

Faigenbaum, Avery D. EdD, CSCS; Lloyd, Rhodri S. PhD, CSCS*D; Sheehan, Damien CSCS; Myer, Gregory D. PhD, CSCS

Abstract

ALTHOUGH THE HEALTH BENEFITS OF REGULAR EXERCISE FOR CHILDREN AND ADOLESCENTS ARE EXTENSIVE, MOST YOUTH FAIL TO MEET CURRENT RECOMMENDATIONS FOR DAILY PHYSICAL ACTIVITY. SPECIFICALLY, AN INCREASING NUMBER OF YOUTH DEMONSTRATE SYMPTOMS OF EXERCISE DEFICIT DISORDER DURING THE GROWING YEARS, WHICH CAN LEAD TO A PROGRESSION OF PATHOLOGICAL PROCESSES. ALTHOUGH THE CRITICAL IMPORTANCE OF THIS PUBLIC HEALTH CONCERN HAS YET TO GARNER THE RECOGNITION TO SUPPORT HEALTH CARE REFORM, PHYSICAL INACTIVITY SHOULD BE IDENTIFIED EARLY IN LIFE AND YOUNG PATIENTS SHOULD BE REFERRED TO A PEDIATRIC EXERCISE SPECIALIST FOR PREVENTATIVE CARE.
(C) 2013 National Strength and Conditioning Association
http://journals.lww.com/nsca-scj/Abstract/publishahead/The_Role_of_the_Pediatric_Exercise_Specialist_in.99636.aspx

I Look, Therefore I See. Using Action Observation in Improving Strength and Conditioning Techniques


Sakadjian, Alex BExSci; Panchuk, Derek PhD; Pearce, Alan J. PhD


Abstract

ACTION OBSERVATION (AO) IS LEARNING A SKILL THROUGH OBSERVING ANOTHER INDIVIDUAL (MODEL) PERFORMING THE SAME SKILL. AO IS THE MOST COMMONLY USED METHOD OF INSTRUCTION FOR SKILL ACQUISITION. IN ATHLETE PREPARATION, COACHING TECHNICAL AND NOVEL RESISTANCE TRAINING (RT) EXERCISES TO ATHLETES IS COMMON, BUT AT TIMES, AVOIDED BECAUSE OF TIME EFFICIENCY AND SAFETY CONCERNS. THIS ARTICLE DISCUSSES CURRENT EVIDENCE SURROUNDING THE APPLICATION OF AO IN COACHING DURING SKILL ACQUISITION AND THE LIMITED BUT GROWING EVIDENCE ILLUSTRATING THE POTENTIAL OF IMPLEMENTING AO IN AN RT SETTING.
(C) 2013 National Strength and Conditioning Association


http://journals.lww.com/nsca-scj/Abstract/publishahead/I_Look,_Therefore_I_See__Using_Action_Observation.99639.aspx

Exercise Technique: The Long-Lever Posterior-Tilt Plank


Schoenfeld, Brad J. MSc, CSCS, CSPS, NSCA-CPT; Contreras, Bret M. MA, CSCS


Abstract

THE LONG-LEVER POSTERIOR-TILT PLANK IS AN ADVANCED VERSION OF THE TRADITIONAL PRONE PLANK DESIGNED TO IMPOSE A GREATER STIMULUS ON THE CORE MUSCULATURE AND THUS PROVIDE BETTER UTILITY FOR THOSE WHO ARE WELL TRAINED.

http://journals.lww.com/nsca-scj/Abstract/publishahead/Exercise_Technique___The_Long_Lever_Posterior_Tilt.99641.aspx?utm_source=getresponse&utm_medium=email&utm_campaign=bretcontreras&utm_content=Random+Thoughts%2C+Long+Lever+Posterior+Tilt+Plank%2C+and+Movement+Pattern+Continuums

Why Youth Strength and Conditioning Matters

Rick Howard, MEd, CSCS,*D


Top three valuable aspects of a youth strength and conditioning program.

The Path to Performance

All athletes have one thing in common – they either are, or were, youth. The youth strength and conditioning programs in which these athletes participate have long-term performance implications. So, whether you are a RSCC, CSCS, NSCA-CPT, sport scientist, or other allied strength and conditioning professional, here are three important youth strength and conditioning concepts:
  1. Develop physical literacy for youth by promoting a long-term approach to quality daily physical education and daily intermittent moderate-to-vigorous physical activity.
  2. Promote positive mental and psychosocial development as well as physical development with a properly designed strength and conditioning program.
  3. The Youth Resistance Training: Updated Position Statement Paper from the National Strength and Conditioning Association (2009) for guidelines on strength and conditioning programs that emphasize a long-term approach to developing strength and power.

A Model for ALL Youth

At the foundation of training youth is the philosophy that ALL children should be provided the opportunity to develop their physical, mental, and social skills. These physical, mental, and social skills must be considered simultaneously. Coaches must be aware of the nonlinear path of youth development and how this considerable variability of developmental stages has physical, mental, and social implications. Training strategies for youth must be carefully planned based on the dynamic interrelationships of numerous variables such as number of sports being played throughout the year and during the same season, environment, ethnicity, self-efficacy, focus, etc. Strength coaches need to keep abreast of best practice and research-based program models for promoting the continuum of lifelong physical activity and sports participation for youth.
The long term athletic development (LTAD) model is a generic guide that can be used to plan the sport/activity specific plan. LTAD heightens coaches’ awareness that the focus should not be on early sport specialization but that a plan should be implemented to meet the individual needs of young athletes as they develop. LTAD is based predominantly on biological (physical) development and suggests training and competition strategies based on developmental and chronological age. The LTAD-type program should contain developmentally-appropriate strength and conditioning as well as important elements of positive conditioning, active play, and unstructured play. Proper ratios of conditioning-to-practice and practice-to-competition are suggested and have been customized by national governing bodies to meet the needs of their sport (youth hockey and soccer, for example). Youth should participate in a wide variety of sports and activities that develop their physical, mental, and psychosocial skills-- early sport specialization is discouraged.
Within a quality youth long term developmental program, differences in biological and developmental age of youth must be considered. Key measures of developmental maturation must be incorporated into the strength and conditioning program. This requires a cooperative team effort among coaches, parents, youth, physical educators, and strength and conditioning professionals to safely and efficaciously train youth along the developmental continuum. Children will be at various points along the developmental continuum, even children of the same biological age, and those that excel at an early age need to be diversified to minimize overuse and burnout and those are considered “late bloomers” must be encouraged to continually improve. This will maximize the number of youth that are proficient in movement skills and can make their own choice to be active in sports and physical activity.
The environment in which training occurs needs to be proactive: fundamental motor skill development must be taught, coached, and assessed; positive feedback must continually and honestly be provided to youth so that skill acquisition and the positive benefits of strength and conditioning are always reinforced, and never should children be given exercise as punishment. Strength coaches must focus on developing coaching cues for excellent lifting technique (and never sacrifice technique for increased resistance). Youth athletes must not be trained past the point of physiological benefit (e.g., making athletes vomit is not an appropriate measure of intensity).  The optimal balance of challenge and success leads to youth embracing the benefits of strength and conditioning programs (and sports programs too).

Resistance Training and Long Term Athletic Development

Resistance training for youth is safe and efficacious so long as important NSCA guidelines are followed. For example, participants must be able to listen to and follow directions, there must be quality supervision at all times, and exercise progressions must be developmentally appropriate. The focus of the prepubescent resistance training program is on the development of healthy habits of safe resistance training and the focus on technical performance (technique) over amount of resistance lifted. Exercise technique is developed through body weight exercise, dowels, and light (2-3kg) medicine balls. Some youngsters that are very overweight or obese will need to use light weights before body weight, as their body weight is a significant challenge. Developmental progressions for a variety of strength and power exercises should be taught. Beginning resistance training is not sport-specific, but designed to develop health-fitness and skills-fitness attributes, which matches the philosophy of the long term development model.

What Can You Do?

NSCA-certified strength and conditioning professionals are uniquely qualified to provide properly supervised, developmentally appropriate strength and conditioning programs for youth of all ages and abilities. By following the guidelines listed in the NSCA Position Statement on youth resistance training and adapting an LTAD-type model to the specific youngster or team, you will provide a healthy, positive strength and conditioning experience that will benefit youth dually as exercise enthusiasts and athletes. Multidisciplinary, longitudinal research is needed on LTAD, physical literacy, windows of opportunity, assessments, and dose response of strength and conditioning programs at various developmental stages. Furthermore, strength and conditioning programs should be evaluated based on whether they enhance performance for only the short-term or whether they promote long-term elite athletic development. Remember, the work you do to promote quality strength and conditioning programs for youth will have long-term performance implications.
About the Author
Rick Howard is a founding member of the NSCA Youth SIG, Immediate-Past Chair of the NSCA Youth SIG, and the Mid-Atlantic Region Coordinator for the NSCA State Provincial Director Program. Howard also serves on the NSCA Membership Committee.


http://www.nsca.com/Education/E-learning/Why-Youth-Strength-and-Conditioning-Matters/

segunda-feira, 11 de março de 2013

High-Intensity Interval Resistance Training (HIRT) influences resting energy expenditure and respiratory ratio in non-dieting individuals



Abstract

Background

The benefits of exercise are well established but one major barrier for many is time. It has been proposed that short period resistance training (RT) could play a role in weight control by increasing resting energy expenditure (REE) but the effects of different kinds of RT has not been widely reported.

Methods

We tested the acute effects of high-intensity interval resistance training (HIRT) vs. traditional resistance training (TT) on REE and respiratory ratio (RR) at 22 hours post-exercise. In two separate sessions, seventeen trained males carried out HIRT and TT protocols. The HIRT technique consists of: 6 repetitions, 20 seconds rest, 2/3 repetitions, 20 secs rest, 2/3 repetitions with 230″ rest between sets, three exercises for a total of 7 sets. TT consisted of eight exercises of 4 sets of 8–12 repetitions with one/two minutes rest with a total amount of 32 sets. We measured basal REE and RR (TT0 and HIRT0) and 22 hours after the training session (TT22 and HIRT22).

Results

HIRT showed a greater significant increase (p < 0.001) in REE at 22 hours compared to TT (HIRT222362 ± 118 Kcal/d vs TT22 1999 ± 88 Kcal/d). RR at HIRT22 was significantly lower (0.798 ± 0.010) compared to both HIRT0 (0.827 ± 0.006) and TT22 (0.822 ± 0.008).

Conclusions

Our data suggest that shorter HIRT sessions may increase REE after exercise to a greater extent than TT and may reduce RR hence improving fat oxidation. The shorter exercise time commitment may help to reduce one major barrier to exercise.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3551736/?tool=pmcentrez&rendertype=abstract

The role of leptin and ghrelin in the regulation of food intake and body weight in humans: a review


  1. M. D. Klok, 
  2. S. Jakobsdottir, 
  3. M. L. Drent

Summary

Leptin and ghrelin are two hormones that have been recognized to have a major influence on energy balance. Leptin is a mediator of long-term regulation of energy balance, suppressing food intake and thereby inducing weight loss. Ghrelin on the other hand is a fast-acting hormone, seemingly playing a role in meal initiation. As a growing number of people suffer from obesity, understanding the mechanisms by which various hormones and neurotransmitters have influence on energy balance has been a subject of intensive research. In obese subjects the circulating level of the anorexigenic hormone leptin is increased, whereas surprisingly, the level of the orexigenic hormone ghrelin is decreased. It is now established that obese patients are leptin-resistant. However, the manner in which both the leptin and ghrelin systems contribute to the development or maintenance of obesity is as yet not clear. The purpose of this review is to provide background information on the leptin and ghrelin hormones, their role in food intake and body weight in humans, and their mechanism of action. Possible abnormalities in the leptin and ghrelin systems that may contribute to the development of obesity will be mentioned. In addition, the potentials of leptin and ghrelin as drug targets will be discussed. Finally, the influence of the diet on leptin and ghrelin secretion and functioning will be described.


http://onlinelibrary.wiley.com/doi/10.1111/j.1467-789X.2006.00270.x/abstract;jsessionid=C2EE821034A976B4DEF422E730A72358.d03t04