Effects of Aerobic Interval Training Versus Continuous Moderate
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Annals of Agricultural and Environmental Medicine 2014, Vol 21, No 4, 844–849 www.aaem.pl ORIGINAL ARTICLE Effects of aerobic interval training versus continuous moderate exercise programme on aerobic and anaerobic capacity, somatic features and blood lipid profile in collegate females Krzystof Mazurek1, Krzysztof Krawczyk2, Piotr Zmijewski3, Henryk Norkowski1, Anna Czajkowska1 1 Józef Piłsudski University of Physical Education, Warsaw, Poland 2 Maria Curie Skłodowska University, Lublin, Poland 3 Insitute of Sport, Warsaw, Poland Mazurek K, Krawczyk K, Zmijewski P, Norkowski H, Czajkowska A. Effects of aerobic interval training versus continuous moderate exercise programme on aerobic and anaerobic capacity, somatic features and blood lipid profile in collegate females. Ann Agric Environ Med 2014; 21(4): 844–849. doi: 10.5604/12321966.1129949 Abstract Introduction. Regular physical activity has many positive health benefits, including reducing the risk of cardiovascular diseases, metabolic diseases and some cancers, as well as improving the quality of life. Objectives. The aim of the study was to examine the effects of 8-week aerobic interval cycle exercise training (AIT) compared to continuous cycle exercises of moderate intensity (CME) on the aerobic and anaerobic capacity, somatic features and lipid profile. Material and methods. The research was conducted in 88 volunteers aged 19.5±0.6 years, who were randomized to three groups of organized physical activity (OPA), who exercised 3 times per week in 47 min sessions: (I) AIT (n=24) comprising 2 series of 6x10 s sprinting with maximal pedalling cadence and active rest pedalling with intensity 65%–75% HRmax, (II) CME (n=22) corresponding to 65%-75% HRmax, (III) regular collegiate physical education classes of programmed exercises (CON; n=42). Before and after OPA anthropometrics, aero- and anaerobic capacity and lipid profile indices were measured. Results. In AIT, a significantly greater decrease of waist circumference and WHR was noted when compared to CON, and a significantly greater reduction of sum of skinfolds than in CON and CME. Improvement in relative and absolute VO2max (L/min and ml/kg/min) was significantly higher in AIT than CON. Work output and peak power output in the anaerobic test improved significantly in AIT, CME and CON, but independently of training type. OPA was effective only in reducing triglyceride concentrations in CME and CON groups, without interaction effects in relation to training type. Conclusion. It was found that 8 weeks of OPA was beneficial in improving somatic and aerobic capacity indices, but AIT resulted in the greatest improvement in somatic indices (waist circumference, WHR, sum of skinfolds) and in VO2max, compared to CME and CON programmes. Key words interval training, aerobic exercise, health, risk factors, women INTRODUCTION energy expenditure on physical activity should be not less than 1,000 kcal/week and optimal levels should Regular physical activity has many positive health benefits, exceed 2,000 kcal/week [5]. In compliance with the WHO including reducing risk of cardiovascular diseases, metabolic recommendations, the physical activity level for maintaining diseases and some cancers, as well as improving the quality a good health condition should include at least 150 minutes of of life. In contrast, lack of physical activity is associated aerobic exercises with moderate intensity per week, or at least with higher risk of civilization diseases and risk of death 75 minutes of intensive aerobic exercises, or an equivalent total from general causes, and particularly from cardiovascular volume of moderate and intensive physical activity. Additional events [1, 2]. health benefits can be expected when physical activity is An adequate level of physical activity, apart from appropriate increased above 300 minutes per week. Furthermore, health nutritional habits, is necessary to maintain optimal values benefits can be gained when additionally stretching and of physiological indices related to health, especially physical resistance exercises performed twice a week are included [6]. fitness, body composition and lipid profile [3, 4]. Many studies have confirmed the profitable effects of Modality (intensity and volume) of physical activity has physical activity on indices of health, including: decreasing an essential effect on achieved health benefits [1]. According BMI, reducing fat tissue, increasing lean body mass, to recommendations of the European Society of Cardiology decreasing resting heart rate and profitable modification of and the Polish Society of Cardiology addressed to adults, lipid profile [1, 7, 8]. It has been shown that physical training including interval Address for correspondence: Krzystof Mazurek, Józef Piłsudski University of aerobic exercises of high intensity (aerobic interval training Physical Education in Warsaw, Zakład Medycyny Sportowej, ul. Marymoncka 34, 00-962 Warsaw, Poland – AIT) compared to continuous training with moderate E-mail: [email protected] intensity and constant load (continuous moderate exercise Received: 19 July 2013; accepted: 3 April 2014 – CME) provided additional benefits in terms of reduction Annals of Agricultural and Environmental Medicine 2014, Vol 21, No 4 845 Krzystof Mazurek, Krzysztof Krawczyk, Piotr Zmijewski, Henryk Norkowski, Anna Czajkowska. Effects of aerobic interval training versus continuous moderate… of metabolic risk factors in women, as well as reduction of 10 min of active recovery at workload adjusted to 65–75%. A cardiovascular risk factors [9]. Very recent studies present decrease in participant’s HR at the current workload presaged different effects of AIT and CME on cardiovascular fitness, to increase in pedalling cadence. heart function and improving body composition in some Heart rate (HR) was monitored with use of a heart rate specific populations in relation to training volume, session monitor (Polar Electro Inc, Lake Success, NY) during each frequency and intensity modalities [10,11,12]. However, there is phase of protocol. still a need for establishing the most effective exercise protocols that could be carried out by insufficiently active subjects. Continuous moderate cycle exercise training (CME). Mechanically-braked cycle ergometers (HESS AG., Poland), the same as for AIT, was used in the CME protocol. Each OBJECTIVES training session consisted of 10-min warm-up, a 32-min stage of continuous moderate exercise stage, and 5-min cool-down The purpose of the current study was to examine the effects stage. In the main stage of the protocol, participants exercised of 8-week aerobic interval cycle exercise training compared at 65–75% HRmax intensity. to continuous cycle exercises of moderate intensity on the aerobic and anaerobic capacity, somatic features and lipid Control group (CON). The CON group participated in profile in collegiate women. typical collegiate physical education classes adjusted for time It was hypothesized that 8-week aerobic cycle exercise of exercise to 47 min. Participants were asked to maintain programmes would significantly improve aerobic capacity, their regular physical activity. somatic features and blood lipid profile, but a programme of aerobic interval training would produce even greater Measurements improvements than a continuous moderate exercise programme. Somatic features. Anthropometric measurements included: body mass, body height, 6 skinfolds (biceps, triceps, subscapular, suprailiac, abdominal, and medium calf), waist MATERIAL AND METHOD and hip circumferences. Body mass was measured with a weight scale (model: BC 418MA, Tanita Co., Tokyo, Japan) Subjects. Eighty-eight previously untrained collegiate to the nearest 0.1 kg, and body height with a stadiometer to females, aged 19.5±0.6, volunteered for this study. Participants the nearest 0.1 cm. Skinfold measurements were performed were randomized to the aerobic cycle interval training (AIT, by an experienced technician, using a Harpenden caliper n=24), continuous moderate cycle exercise training (CME, (British Indicators Ltd., St. Albans, UK) with a contact n=22) or a control group (CON, n=42), which participated in surface pressure of 10 g/mm. The mean of 3 measurements regular collegiate physical education classes. All participants was used for representing skinfold thickness. Waist-to-hip attended the 8-week training; groups AIT and CME had ratio (WHR) and body mass index (BMI) were calculated. 3 training sessions per week and the CON group had their regular physical education classes once a week. Time of the Aerobic and anaerobic capacity sessions and mean intensity of exercise in both intervention Aerobic capacity. Aerobic capacity was expressed as estimated protocols were very close to recent recommendations of maximal oxygen uptake (VO2 max), obtained using the cycle optimal training loads for subjects from an incorporated ergometer test and the Åstrand-Ryhming nomogram from age group [13]. Subjects’ fitness level assessed by maximal the steady state heart rate (HR) and work load. The test was oxygen consumption, was assessed as low (Tab. 1). Subjects conducted on a Monark bike ergometer, model 874E (Monark were instructed about the aim and methods of examination Exercise, Vansbro, Sweden). Prior to testing, the participants and were recommended to continue their normal dietary were fitted with a heart rate monitor (Polar Electro Inc, Lake and physical activity practices throughout the study, but to Success, NY) linking the heart rate response to the ergometer