High Intensity Interval Training in a Real World Setting: A Randomized Controlled Feasibility Study in Overweight Inactive Adults, Measuring Change in Maximal Oxygen Uptake

Abstract

BackgroundIn research clinic settings, overweight adults undertaking HIIT (high intensity interval training) improve their fitness as effectively as those undertaking conventional walking programs but can do so within a shorter time spent exercising. We undertook a randomized controlled feasibility (pilot) study aimed at extending HIIT into a real world setting by recruiting overweight/obese, inactive adults into a group based activity program, held in a community park.MethodsParticipants were allocated into one of three groups. The two interventions, aerobic interval training and maximal volitional interval training, were compared with an active control group undertaking walking based exercise. Supervised group sessions (36 per intervention) were held outdoors. Cardiorespiratory fitness was measured using VO2max (maximal oxygen uptake, results expressed in ml/min/kg), before and after the 12 week interventions.ResultsOn ITT (intention to treat) analyses, baseline (N = 49) and exit (N = 39) O2 was 25.3±4.5 and 25.3±3.9, respectively. Participant allocation and baseline/exit VO2max by group was as follows: Aerobic interval training N = 16, 24.2±4.8/25.6±4.8; maximal volitional interval training N = 16, 25.0±2.8/25.2±3.4; walking N = 17, 26.5±5.3/25.2±3.6. The post intervention change in VO2max was +1.01 in the aerobic interval training, −0.06 in the maximal volitional interval training and −1.03 in the walking subgroups. The aerobic interval training subgroup increased VO2max compared to walking (p = 0.03). The actual (observed, rather than prescribed) time spent exercising (minutes per week, ITT analysis) was 74 for aerobic interval training, 45 for maximal volitional interval training and 116 for walking (p = 0.001). On descriptive analysis, the walking subgroup had the fewest adverse events.ConclusionsIn contrast to earlier studies, the improvement in cardiorespiratory fitness in a cohort of overweight/obese participants undertaking aerobic interval training in a real world setting was modest. The most likely reason for this finding relates to reduced adherence to the exercise program, when moving beyond the research clinic setting.Trial RegistrationACTR.org.au ACTRN12610000295044

Efeito do treinamento intervalado de alta intensidade versus treinamento contínuo na composição corporal: uma revisão sistemática com meta-análise

“…Sete estudos avaliaram secundariamente [31][32][33][34][35][36][37] e cinco estudos tiveram controle alimentar 26,29,30,33,37 .…”

“…As durações das sessões tiveram média de 35,7 ± 13,3 min e 44,7 ± 9,7 min para os grupos HIIT e CONT respectivamente. 34 . Nos estudos incluídos, treze estudos utilizaram recuperação ativa e apenas um estudo utilizou recuperação passiva.…”

“…Dos estudos incluídos, apenas 13 estudos analisaram à composição corporal em relação ao percentual de gordura, os métodos de análises incluiram: quatro estudos avaliaram pelo método de bioimpedância 23,27,34,35 ; nove estudos através da absorciometria por dupla emissão de raio-x (DEXA) 1,26,[28][29][30][31]33,36,37 . Dentre os desfechos antropometricos 13 estudos incluíram a massa corporal total; 12 avaliaram o índice de massa corporal e apenas oito estudos avaliaram a CC, conforme pode ser visto na Tabela 1.…”

“…lidade" com pontuações equivalente a 8 pontos 26,34 . Dos 15 estudos, 36% alocaram ocultamente os participantes; apenas um estudo apresentou diferença significativa no momento pré intervenção; somente um estudo teve cegamento dos sujeitos; nenhum estudo incluido relatou cegamento dos terapeutas; somente cinco (36%) estudos relataram cegamento dos avaliadores; 43% avaliaram os desfechos em mais de 85% dos participantes iniciais; apenas 29% dos estudos tiveram a intenção de tratar.…”

Exercise and lifestyle intervention and high intensity interval training in patients with chronic kidney disease

“…Aamot et al (2013) found that participants in Norway performing HIIT at home in their own chosen modality, whether it be cross-country skiing, cycling or cross-training, still met their target HR using a HR monitor. (317) Furthermore, a study by Lunt et al (2014) used the 4x4 protocol in outdoor group sessions. (318) Even though the authors found improvements in VO 2 peak to be slightly lower than previously observed in other studies, this study recognized the feasibility of HIIT in a real world setting.…”