Len KravitzLen Kravitz, PhD is a professor and program coordinator of exercise science at the University of New Mexico where he recently received the Presidential Award of Distinction and the Outstanding Teacher of the Year award. In addition to being a 2016 inductee into the National Fitness Hall of Fame, Dr. Kravitz was awarded the Fitness Educator of the Year by the American Council on Exercise. Just recently, ACSM honored him with writing the 'Paper of the Year' for the ACSM Health and Fitness Journal.
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We have good exercise guidance for fit older adults, but the advice for seniors just starting a fitness program has been less clear.Read More
Introduction: What Is Extreme Conditioning?
Extreme conditioning programs (ECPs) boast vastly improved fitness in relatively short periods of time, which appeals to a cross-section of the U.S. civilian and military populations. Yet many health professionals fear that these high-powered, widely marketed programs increase the risk of musculoskeletal injuries.Read More
1. What hormonal changes are observed in boys and girls at puberty?
At puberty, girls develop more adipose tissue, owing to their estrogen levels, and boys develop more muscle mass, owing to their testosterone levels (Isacco, Duché & Boisseau 2012).
2. What is the menstrual cycle, and what are its distinct phases?
?When it comes to optimal endurance exercise performance, fuel source and utilization play a major role in success. The contribution and expenditure of fats and carbohydrates for the synthesis of ATP (adenosine triphosphate) during exercise are regulated by several factors, including activity, duration and intensity, as well as the person’s age, training status, diet and gender. Proteins contribute a minor 1%–8% of fuel needs during submaximal exercise (Isacco, Duché & Boisseau 2012).Read More
1. Why are checkups important?
Checkups are vital to the early detection and prevention of health problems. Receiving proper treatments and screenings can lead a woman along the right path to a long and healthy life. The frequency of visits should depend on important lifestyle factors, such as diet, activity level, smoking habits and current health conditions. www.cdc.gov/family/checkup/index.htm; retrieved Aug. 26, 2012.Read More
Hall, K.D., et al. 2012. Energy balance and its components: Implications for body weight regulation. American Journal of Clinical Nutrition, 95 (4), 989–94. Energy balance represents the complex interplay between the fuel we consume and the energy we exert, which makes this balance integral to the process of losing weight.Read More
Kettlebells have enjoyed growing popularity as a total-body training tool for improving cardiovascular health and musculoskeletal fitness. Yet for all the enthusiasm among personal trainers, experimental research on the effects of KB training was scant until last year, when studies began showing up in peer-reviewed journals. Here are the recent research findings on KB training.
Study 1. Metabolic Demand of Kettlebell TrainingRead More
Kettlebells have seen growing popularity as a total-body training tool to improve cardiovascular health and musculoskeletal fitness. Yet for all the enthusiasm among personal trainers, experimental research on the effects of KB training was scant until last year, when studies began showing up in peer-reviewed journals. This column updates IFJ readers with recent research on KB training.Read More
Study reviewed: Voight, B.J., et al. 2012. Plasma HDL cholesterol and risk of myocardial infarction: A mendelian randomization study. The Lancet, 380 (9841), 572–80.
Reducing the Risks of Bad Cholesterol
The U.S. Department of Health and Human Services’ Therapeutic Lifestyle Program (TLP) offers these guidelines for limiting the risks of high LDL-C:Read More
Paoli, A., et al. 2011. Exercising fasting or fed to enhance fat loss? Influence of food intake on respiratory ratio and excess postexercise oxygen consumption after a bout of endurance training. International Journal of Sport Nutrition and Exercise Metabolism, 21 (1), 48–54.Read More
One variable of interest in Paoli and colleagues’ study was excess postexercise oxygen consumption, or EPOC. This represents the oxygen consumption, or energy expenditure (above the baseline, or pre-exercise, level), that occurs after an exercise bout. It is sometimes called “after-burn,” implying the burning of calories after the workout.Read More
Issues such as the poor economy and smaller work forces are leading more people to work longer hours. Many exercise professionals train clients who work in the fields of health, technology, security, medicine, computer programming, food services and transportation, which often require working evenings and/or night shifts. These professions, and many others, may disturb sleep patterns, compromising cognitive performance and leading to serious health consequences.Read More
Garber, C.E., et al. 2011. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: Guidance for prescribing exercise. Medicine & Science in Sports & Exercise, 43 (7), 1334–59.Read More
The mitochondrion (plural: mitochondria) is a specialized organelle found in most eukaryotic cells (cells that contain a nucleus). It is often referred to as a cell’s energy power plant. Essential for human existence, mitochondria are involved in numerous cell processes that rely on energy sustenance—for example, cell growth, cell messaging, aging and replication (Schardt 2008).…Read More
Cardiovascular disease, the number-one cause of mortality for U.S. men and women, is a cluster of heart and blood vessel problems that are related to the development of atherosclerosis. Atherosclerosis is a condition that progresses when plaque builds up on the walls of arteries. This buildup narrows the arteries, making it more difficult for blood…Read More
As an unexpected consequence of the metabolic steps that convert food into energy, the body produces molecules commonly called “free radicals.” When not produced in too much abundance, free radicals are harmless to the body’s life process and in fact are known to be helpful. However, when cells overproduce free radicals, they can become dangerous…Read More
According to the U.S. Department of Health and Human Services (HHS), children and teens should be physically active for at least 60 minutes on most, if not all, days of the week. This recommendation states that the 60 minutes may be accrued in “smaller chunks” of time throughout the day (HHS 2010). However, Troiano et al. (2008) report that only 8% of youth aged 12–19 years are active for a full 60 minutes per day.Read More