High-intensity interval training

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HIIT with dumbbells HIIT Workout.jpg
HIIT with dumbbells

High-intensity interval training (HIIT) is a training protocol alternating short periods of intense or explosive anaerobic exercise with brief recovery periods until the point of exhaustion. [1] HIIT involves exercises performed in repeated quick bursts at maximum or near maximal effort with periods of rest or low activity between bouts. The very high level of intensity, the interval duration, and number of bouts distinguish it from aerobic (cardiovascular) activity, because the body significantly recruits anaerobic energy systems (although not completely to the exclusion of aerobic pathways). [1] The method thereby relies on "the anaerobic energy releasing system almost maximally". [1]

Contents

Although there are varying forms of HIIT-style workouts which may involve exercises associated with both cardiovascular activity and also resistance training, HIIT's crucial features of maximal effort, duration, and short rest periods (thereby triggering the anaerobic pathways of energy production) materially differentiate it from being considered a form of cardiovascular exercise. [2] Though there is no universal HIIT session duration, a HIIT workout typically lasts under 30 minutes in total as it uses the anaerobic energy systems which are typically used for short, sharp bursts. The times vary, based on a participant's current fitness level. [3] Traditional HIIT initially had been designed to be no longer than 20 seconds on with no more than 10 seconds off; however, intervals of exercise effort tend to range from 20 to 45 seconds but no longer than 75 seconds, at which point the aerobic system would then kick in. [4]

HIIT workouts provide improved athletic capacity and condition as well as improved glucose metabolism. [5] Compared with longer sessions typical of other regimens, HIIT may not be as effective for treating hyperlipidemia and obesity, or improving muscle and bone mass. [6] However, research has shown that HIIT regimens produced reductions in the fat mass of the whole-body in young women comparable to prolonged moderate-intensity continuous training (MICT). [7] Some researchers also note that HIIT requires "an extremely high level of subject motivation" and question whether the general population could safely or practically tolerate the extreme nature of the exercise regimen. [8]

Sprint interval training (SIT) is an exercise conducted in a similar way to HIIT, but instead of using "near maximal" effort for the high-intensity periods, "supramaximal" or "all-out" efforts are used in shorter bursts. In physiological terms, "near maximal" means reaching 80–100% HRmax, while "supramaximal" means a pace that exceeds what would elicit VO2 peak. SIT regimens generally include a lower volume of total exercise compared with HIIT ones as well as longer, lower activity recovery periods and creates a greater homeostatic disturbance. [9] Both HIIT and SIT fall into the larger class of interval training. [10] Distinction between the two is not always maintained, even in academia: for example, Tabata describes his 170% VO2 max regimen as "supermaximal", but does not use the term SIT. [11]

Procedure

HIIT exercise sessions generally consist of a warm-up period followed by repetitions of high-intensity exercises separated by medium intensity exercises for recovery, then a cool-down period. The high-intensity exercise should be done at near maximum intensity. The medium exercise should be about 50% intensity. The number of repetitions and length of each depends on the exercise, but may be as little as three repetitions with just 20 seconds of intense exercise. [12] The specific exercises performed during the high-intensity portions vary. Most of the research on HIIT has been done using a cycling ergometer, but other exercises like a rowing ergometer, running, stair climbing and uphill walking can also be effective. [13]

There is no specific formula for HIIT. Depending on one's level of cardiovascular development, the moderate-level intensity can be as slow as walking. A common formula involves a 2:1 ratio of work to recovery periods, for example, 30–40 seconds of hard sprinting alternated with 15–20 seconds of jogging or walking, repeated to failure.

The entire HIIT session may last between four and 30 minutes, meaning that it is considered to be an excellent way to maximize a workout limited by time constraints. [14] Use of a clock or timer is recommended to keep accurate times, the number of rounds, and intensity.

An alternative form of HIIT, designed for heart rate training, involves a 30-minute period of cardio followed by 30 minutes of full-body resistance training to help maximize calorie burning. [15] The idea is to combine aerobic exercise with intense weight and resistance training to achieve a high level heart rate for an extended period of time, in order to maximize strength and endurance.

Pace and Heart rate graphs during HIIT exercise Hiit graphs.jpg
Pace and Heart rate graphs during HIIT exercise

Branches

Peter Coe regimen

In the 1970s a type of high-intensity interval training with short recovery periods was used by the athletics coach Peter Coe when setting sessions for his son Sebastian Coe. Inspired by the principles propounded by the German coach and university professor Woldemar Gerschler and the Swedish physiologist Per-Olof Åstrand, Coe set sessions involving repeated fast 200 meter runs with only 30 seconds recovery between each fast run. [16]

Tabata regimen

A version of HIIT is based on a 1996 study [1] by Ritsumeikan University Professor Izumi Tabata (田畑泉) et al. initially involving Olympic speedskaters. The study used 20 seconds of ultra-intense exercise (at an intensity of about 170% of VO2max) followed by 10 seconds of rest, repeated continuously for 4 minutes (8 cycles). The exercise was performed on a mechanically braked cycle ergometer. Tabata called this the IE1 protocol. [17] In the original study, athletes using this method trained 4 times per week, plus another day of steady-state training, for 6 weeks and obtained gains similar to a group of athletes who did steady state training (70% VO2max) 5 times per week. The steady state group had a higher VO2max at the end (from 52 to 57 mL/(kg•min)). However the Tabata group had achieved comparable aerobic improvements but only exercised 4 minutes per day on their 4 HIIT days compared to 60 minutes for the aerobic group. The Tabata group also started lower and gained more overall (from 48 to 55 mL/(kg•min)). Also, only the Tabata group had gained anaerobic capacity benefits. (As Tabata's protocol is "supermaximal", [11] his regimen technically falls into the scope of SIT.)

Gibala regimen

Professor Martin Gibala and his team at McMaster University in Canada have been researching high-intensity exercise for several years. Their 2010 study on students [18] uses 3 minutes for warming up, then 60 seconds of intense exercise (at 95% of VO2max) followed by 75 seconds of rest, repeated for 8–12 cycles (sometimes referred to as "The Little Method"). Subjects using this method training 3 times per week obtained gains similar to what would be expected from subjects who did steady-state (50–70% VO2max) training five times per week. While still a demanding form of training, the general public could use this exercise protocol with nothing more than an average exercise bike.[ citation needed ]

Gibala's group published a less intense version of their regimen in a 2011 paper in Medicine & Science in Sports & Exercise . This was intended as a gentler option for sedentary people who had done no exercise for over a year. It included 3 minutes of warm-up, 10 repetitions of 60-second bursts at 60% peak power (80–95% of heart rate reserve) each followed by 60 seconds of recovery, and then a 5-minute cool-down. [19]

Zuniga regimen

In 2011 Jorge Zuniga, assistant professor of exercise science at Creighton University, set out to determine how to fit the highest volume of work and oxygen consumption into the smallest amount of time. He found that intervals of 30 seconds at 90% of power output at VO2 max followed by 30 seconds of rest allowed for the highest VO2 consumption and the longest workout duration at specified intensity. Alternative protocols considered included 100% of maximum power output on the same interval schedule, similar to the Coe regimen, and 90% of maximum power output for three minutes, similar to traditional interval training. [20]

Zuniga's protocol has been implemented with great success by students of his who were participating in Creighton's Army ROTC program. Cadets completing the protocol twice a week saw greater improvements in APFT scores than in years past.[ citation needed ] Zuniga's protocol typically consists of 10 repetitions.

Vollaard regimen

Dr Niels Vollaard at the University of Stirling proposed that when high-intensity intervals are done at "all-out" intensities, associated health benefits plateau after performing 2 or 3 sprint repetitions. This led to the development of a 10-minute exercise routine consisting of easy pedalling interspersed with two 20-second "all-out" cycling sprints. [21] In a 2017 meta-analysis, Vollaard indeed showed that common protocols with as many as 6 to 10 repetitions of 30-second "all-out" sprints do not improve aerobic fitness more than the "2×20-s" protocol. He shifted the terminology for his to SIT. [22] It is claimed that this short protocol may remove many of the drawbacks that make other high-intensity interval training protocols unsuitable for the general population. [23]

In a BBC Horizon program in February 2012, Jamie Timmons, professor of systems biology at the University of Loughborough, led Michael Mosley through this exercise bike regimen, each time using three sprints instead of two. This protocol was performed three times a week for a total of 30 minutes of exercise per week (3 minutes of intense exercise), plus warm-up and recovery time. [24]

Regimen comparison

A study compared HIIT of eight 1-minute bouts at 85% maximum Watts (Wmax) interspersed with 1-minute active recovery at 25% Wmax, to SIT of eight 30-second bouts at 130% Wmax interspersed with 90-second active recovery at 25% Wmax (Total time-matched at 24 minutes including warm-up & cooldown). Its conclusion was "HIIT is the recommended routine" but "the magnitude of differences in various parameters between regimens was small; therefore, preference for either modality may be up to the individual". [25]

Health effects

Cardiovascular effects

HIIT training and traditional endurance training both lead to significantly improved cardiovascular fitness in healthy adults ages 18–45 but HIIT leads to greater improvements in VO2 max. [26] HIIT regimens of one month or longer effectively improve cardiovascular fitness in adolescents and lead to moderate improvements in body composition. [27] HIIT (when defined as four intervals of four minutes at 85–95% of max heart rate with three-minute intervals at 60–70% of max heart rate) is also more effective than moderate-intensity continuous training at improving blood vessel function and markers of blood vessel health. [28]

Comparing HIIT to moderate intensity continuous training (MICT) in people with coronary artery disease, HIIT leads to greater improvements in VO2 max but MICT leads to greater reductions in body weight and heart rate. [29] Improvement to cardiorespiratory fitness, as measured by VO2 max, of individuals with lifestyle-induced chronic cardiovascular or metabolic diseases (including high blood pressure, obesity, heart failure, coronary artery disease, or metabolic syndrome) who completed a HIIT exercise program can be nearly double that of individuals who completed a MICT exercise program (19.4% increase and 10.3% increase, respectively). [30]

Rehabilitative effects

For people suffering from coronary artery disease or heart failure, a HIIT regimen is beneficial for substantially improving both groups VO2 max and overall exercise capacity; with more intense HIIT leading to the greatest cardiovascular improvements. [31] A combination of a proper HIIT program with active recovery instead of passive recovery is most beneficial to improving heart contractibility in people with heart failure. [31]

Metabolic effects

HIIT significantly lowers insulin resistance compared to continuous training or control conditions and leads to modestly decreased fasting blood glucose levels and increased weight loss compared to those who do not undergo a physical activity intervention. [32]

Fat oxidation

HIIT can result in modest reductions of subcutaneous fat in young and healthy individuals, but greater reductions for overweight individuals. [33] HIIT, particularly running, is a time-efficient strategy in decreasing abdominal and visceral fat-mass deposits. [34]

A 2021 systematic review examined the effects of HIIT combined with resistance training in teens (ages 10–19), without providing a nutritional plan. The study found that 8 to 12 weeks of HIIT combined with resistance training can substantially reduce waist size and body fat percentage. However the study did not find conclusive evidence of HIIT and resistance training being an effective solitary treatment for type 2 diabetes or arterial hypertension, but did find HIIT has the potential to reduce future cardiovascular problems in teens. [35]

Brain power

HIIT can elicit short term brain improvements similar to those usually observed with aerobic exercise. [36]

Dangers of HIIT

The American College of Sports Medicine suggests consulting one's doctor before starting a HIIT regimen, particularly if there is a history of coronary heart disease. This is to ascertain its safety and allow the patient to build up the intensity of exercise without causing harm. [37] It is advised to start a lower intensity and go at one's own pace. [38]

There is a risk of injury due to fatigue and overtraining, so it is advised to allow time for recovery. [39] [40] Research from Rutgers University demonstrated that the knees, shoulders, and ankles were the most commonly involved injuries. More specifically, knee and ankle sprains were very common. Based on that, neuromuscular training and pre-strengthening programs are recommended to improve flexibility, particularly before exercise. [41]

Research

A 2007 study examined HIIT's physiological effects on fat oxidation in moderately active women. The participants in the study performed HIIT (defined as ten sets of 4-minute cycling bursts at an intensity of 90% VO2max separated by 2 minutes of rest) every other day over a 2-week period. The study found that seven sessions of HIIT over a 2-week period improved whole body fat oxidation and the capacity for skeletal muscle to oxidize fat in moderately active women. [42]

A 2008 research study found that HIIT was more effective than moderate-intensity continuous training at lowering fasting insulin levels (31% decrease and 9% decrease, respectively). [43]

A 2017 study examined the effect of HIIT on cognitive performance among a group of children. The authors show that HIIT is beneficial to cognitive control and working memory capacity when compared against "a blend of board games, computer games, and trivia quizzes" and that this effect is mediated by the BDNF polymorphism. They conclude that the study "suggests a promising alternative to enhance cognition, via short and potent exercise regimens". [44]

A 2019 clinical trial assessed the effects of HIIT on vascular health in inactive people and found that HIIT has beneficial vascular effects, based on observed decreases in arterial wall thickness and increase in endothelial function. The trial also found that HIIT had stronger effects than medium intensity continuous training (MICT) in enhancing flow mediated dilation and lowering pulse wave velocity in inactive adults from the greater blood flow and vasodilation of blood vessels stimulated by HIIT. Increased flow mediated dilation allows for greater opening of an artery and increased blood flow, allowing for more oxygen to be supplied throughout the body during activity. Pulse wave velocity is used to monitor arterial stiffness; which increases with age and high blood pressure, leading to a higher probability of cardiovascular problems including hypertension or a stroke. [45]

A 2019 study on the relevance of exercise intensity in lower back rehabilitation, demonstrated higher intensity had a greater effectiveness with back therapy than moderate intensity exercise. Participants in the HIIT group had a decrease in back pain intensity and an increase in back muscle strength. [46] In 2020, a similar study explained the strong effectiveness of cardiorespiratory HIIT in treating lower back pain, when combined with other forms of HIIT or mobility exercises.[ citation needed ]

A 2020 study examined the impact of HIIT and moderate intensity continuous training (MICT) on overweight individuals by measuring the effect on cardiorespiratory fitness (CRF). The study found that both forms of training were effective in improving CRF with an increase in VO2 max, however there was no evidence that either training method was more effective than the other in improving cardiorespiratory fitness. [47]

According to a 2020 study HIIT could be used as prehabilitation for men awaiting surgery for urological cancer and it may improve heart and lung fitness within a month before their surgery. [48] [49]

See also

Related Research Articles

<span class="mw-page-title-main">Exercise</span> Bodily activity intended to improve health

Exercise is intentional physical activity to enhance or maintain fitness and overall health.

<span class="mw-page-title-main">Aerobic exercise</span> Low to high intensity physical exercise

Aerobic exercise is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process. "Aerobic" is defined as "relating to, involving, or requiring oxygen", and refers to the use of oxygen to meet energy demands during exercise via aerobic metabolism adequately. Aerobic exercise is performed by repeating sequences of light-to-moderate intensity activities for extended periods of time. Examples of cardiovascular or aerobic exercise are medium- to long-distance running or jogging, swimming, cycling, stair climbing and walking.

<span class="mw-page-title-main">Carbohydrate loading</span> Dietic strategy in preparation for athletic endurance events

Carbohydrate loading, commonly referred to as carb-loading, or carbo-loading, is a strategy used by endurance athletes, such as marathoners and triathletes, to maximize the storage of glycogen in the muscles and liver.

Jack Tupper Daniels is an American exercise physiologist, running coach and a coach of Olympic athletes. On March 21, 2013, he was named the head coach of the Wells College men's and women's cross country programs. He received his doctoral degree in exercise physiology at the University of Wisconsin–Madison. Named "The World's Best Coach" by Runner's World magazine, he led SUNY Cortland runners to eight NCAA Division III National Championships, 31 individual national titles, and more than 130 All-America awards. Daniels outlined his training philosophies in the 1998 book, Daniels' Running Formula. He mentors and coaches some of America's top distance runners in the country.

<span class="mw-page-title-main">Physical fitness</span> State of health and well-being

Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations and daily activities. Physical fitness is generally achieved through proper nutrition, moderate-vigorous physical exercise, and sufficient rest along with a formal recovery plan.

<span class="mw-page-title-main">Anaerobic exercise</span> Physical exercise intense enough to cause lactate formation

Anaerobic exercise is a type of exercise that breaks down glucose in the body without using oxygen; anaerobic means "without oxygen". In practical terms, this means that anaerobic exercise is more intense, but shorter in duration than aerobic exercise.

Fartlek is a middle- and long-distance runner's training approach developed in the late 1930s by Swedish Olympian Gösta Holmér. It has been described as a "relatively unscientific blending" of continuous training, with its steady pace of moderate-high intensity aerobic intensity, and interval training, with its "spacing of [more intense] exercise and rest intervals". Simply stated, in its widely adapted contemporary forms, fartlek training is alternating periods of faster and slower running, often over natural terrain, including both "level and hilly terrain".

V̇O2 max (also maximal oxygen consumption, maximal oxygen uptake or maximal aerobic capacity) is the maximum rate of oxygen consumption attainable during physical exertion. The name is derived from three abbreviations: "V̇" for volume (the dot over the V indicates "per unit of time" in Newton's notation), "O2" for oxygen, and "max" for maximum and usually normalized per kilogram of body mass. A similar measure is V̇O2 peak (peak oxygen consumption), which is the measurable value from a session of physical exercise, be it incremental or otherwise. It could match or underestimate the actual V̇O2 max. Confusion between the values in older and popular fitness literature is common. The capacity of the lung to exchange oxygen and carbon dioxide is constrained by the rate of blood oxygen transport to active tissue.

<span class="mw-page-title-main">Exercise intensity</span>

Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body makes after exercise. Intensity is the amount of physical power that the body uses when performing an activity. For example, exercise intensity defines how hard the body has to work to walk a mile in 20 minutes.

<span class="mw-page-title-main">Strength training</span> Performance of physical exercises designed to improve strength

Strength training, also known as weight training or resistance training, involves the performance of physical exercises that are designed to improve strength and endurance. It is often associated with the lifting of weights. It can also incorporate a variety of training techniques such as bodyweight exercises, isometrics, and plyometrics.

<span class="mw-page-title-main">Excess post-exercise oxygen consumption</span> Increased rate of oxygen intake following strenuous activity

Excess post-exercise oxygen consumption is a measurably increased rate of oxygen intake following strenuous activity. In historical contexts the term "oxygen debt" was popularized to explain or perhaps attempt to quantify anaerobic energy expenditure, particularly as regards lactic acid/lactate metabolism; in fact, the term "oxygen debt" is still widely used to this day. However, direct and indirect calorimeter experiments have definitively disproven any association of lactate metabolism as causal to an elevated oxygen uptake.

Cardiorespiratory fitness (CRF) refers to the ability of the circulatory and respiratory systems to supply oxygen to skeletal muscles during sustained physical activity. Scientists and researchers use CRF to assess the functional capacity of the respiratory and cardiovascular systems. These functions include ventilation, perfusion, gas exchange, vasodilation, and delivery of oxygen to the body's tissues. As these body's functions are vital to an individual's health, CRF allows observers to quantify an individual's morbidity and mortality risk as a function of cardiorespiratory health.

Interval training is a type of training exercise that involves a series of high-intensity workouts interspersed with rest or break periods. The high-intensity periods are typically at or close to anaerobic exercise, while the recovery periods involve activity of lower intensity. Varying the intensity of effort exercises the heart muscle, providing a cardiovascular workout, improving aerobic capacity and permitting the person to exercise for longer and/or at more intense levels.

Lactate inflection point (LIP) is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercising at or below the lactate threshold, any lactate produced by the muscles is removed by the body without it building up.

Circuit training is a form of body conditioning that involves endurance training, resistance training, high-intensity aerobics, and exercises performed in a circuit, similar to high-intensity interval training. It targets strength building and muscular endurance. An exercise "circuit" is one completion of all set exercises in the program. When one circuit is completed, one begins the first exercise again for the next circuit. Traditionally, the time between exercises in circuit training is short and often with rapid movement to the next exercise.

Long slow distance (LSD) is a form of aerobic endurance training used in sports including running, rowing, skiing and cycling. It is also known as aerobic endurance training, base training and Zone 2 training. Physiological adaptations to LSD training include improved cardiovascular function, improved thermoregulatory function, improved mitochondrial energy production, increased oxidative capacity of skeletal muscle, and increased utilization of fat for fuel. Ernst van Aaken, a German physician and coach, is generally recognized as the founder of the LSD method of endurance training.

Continuous Training is a form of exercise that is performed at a continuous intensity throughout and doesn't involve any rest periods. Continuous training typically involves aerobic activities such as running, cycling, swimming, and rowing. rest intervals. Continuous training can be performed at low, moderate, or high exercise intensities, and is often contrasted with interval training, often called high-intensity interval training. Some training regimens, such as Fartlek, combine both continuous and interval approaches.

<span class="mw-page-title-main">Bruce protocol</span> Test of physical fitness and cardiac health

The Bruce protocol is a standardized diagnostic test used in the evaluation of cardiac function and physical fitness, developed by American cardiologist Robert A. Bruce.

<span class="mw-page-title-main">Cardiovascular fitness</span> Heart-related component of physical fitness

Cardiovascular fitness refers to a health-related component of physical fitness that is brought about by sustained physical activity. A person's ability to deliver oxygen to the working muscles is affected by many physiological parameters, including heart rate, stroke volume, cardiac output, and maximal oxygen consumption.

The benefits of physical activity range widely. Most types of physical activity improve health and well-being.

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