Physical activity and dietary behavior change in Internet-based weight loss interventions: Comparing two multiple-behavior change indices

Abstract

Objective To investigate the effects of two Internet-based weight loss interventions on physical activity (PA) and dietary behaviors using two approaches for computing combined behavior change. Method Participants were 352 overweight/obese women and men completing 12-month interventions in San Diego, California during 2002–2007. Moderate-to-vigorous PA (MVPA) and sedentary time were measured with accelerometers, and dietary fat and fruit and vegetable intake were assessed with food frequency questionnaires. Longitudinal analyses tested the effect of the intervention on combined health behavior change quantified using a standardized residualized change index (SRCI) and a risk factor change index (RFCI). Results At baseline, participants engaged in an average of 153 min/week of MVPA and 525 min/day of sedentary time, and consumed 37% of calories from fat and < 3 fruits and vegetables per day. The interventions had a significant effect on combined behavior change as measured with each approach (p < 0.001). The intervention effect was larger (p < .001) when evaluated using the SRCI (standardized regression coefficient [Beta] = 0.30) than the RFCI (β = −0.18). Conclusion Interventions that target both PA and dietary behaviors appear effective. The SRCI was more sensitive for evaluating the intervention, but the RFCI may be easier to use for communicating public health significance.

Interventions with potential to reduce sedentary time in adults: systematic review and meta-analysis

“…Three studies employed an intervention specifically to reduce SB,40 44 63 16 studies aimed at increasing PA levels,30 35 36 39 41 46 48 49 55 58–60 64 66 72 78 nine studies combined both approaches of reducing SB and increasing PA levels,32 43 53 62 65 68 70 76 77 one study assessed the effect of a dietary intervention on SB,61 and 22 studies (20 reports) applied a multicomponent lifestyle intervention and observed effects on sedentary behaviour (among other outcomes) 29 33 34 37 38 42 45 47 50–52 54 56 57 67 69 71 73 74 75. Twenty studies offered an alternative intervention,30 36 39–41 45 46 49 52–55 59 61–63 68 72 77 10 studies the usual/routine care,29 37 38 42 50 51 67 71 74 75 seven studies used a waiting list control,29 34 48 64 69 76 78 five studies an attention control,35 44 56 57 60 and control participants of seven studies received no intervention at all 32 33 43 47 58 66 …”

Comparative efficacy of simultaneous versus sequential multiple health behavior change interventions among adults: A systematic review of randomised trials

“…The remaining five studies did not nominate a primary outcome and reported each behavior separately, with three of these studies also describing intervention effects across behaviors. Reporting for each behavior individually is the traditional approach when reporting effectiveness of MHBC intervention research (Carlson et al, 2012;Prochaska et al, 2008b;Drake et al, 2013), whilst more recently a simple summative index has been used (Prochaska et al, 2008b;Drake et al, 2013;Spring et al, 2012). Both approaches have limitations and researchers have now begun to examine alternate methods of analysis, such as the creation of a combined change score and modelling an optimal linear combination of multiple risk factors (Drake et al, 2013;Goodman et al, 2006).…”

Validacao de escalas psicossociais para mudanca do consumo de frutas, legumes e verduras

“…Os construtos investigados são baseados em teorias de mudança de comportamento 10,11 que foram testadas empiricamente em estudos de validação, transversais e de intervenção na área da nutrição e em áreas correlatas 12,13,14,15,16,17,18,19 . Como ponto positivo pode-se destacar a operacionalização de todas as etapas de equivalência proposta por Reichenheim & Moraes 21 nesta temática da área de nutrição.…”

“…Nesse último procedimento foram adotados três enfoques: (a) avaliação de validade dimensional O instrumento é composto por 42 questões divididas em sete módulos: frequência de consumo de frutas, legumes e verduras (n = 1); estágio de mudança de comportamento (n = 1); estratégia de mudança (n = 15); processo de tomada de decisão (n = 10); autoeficácia (n = 7); suporte dos pais (n = 4) e amigos (n = 3); e se gosta de consumir frutas, legumes e verduras (n = 1) 12,13,16,17,18,19 . Maiores informações podem ser encontradas na página de Internet http://www.…”

“…Assim, desenvolveram, validaram e utilizaram em estudos com diferentes delineamentos epidemiológicos os construtos dessas teorias para diversos comportamentos de saúde 12,13,14,15,16,17,18,19 . No Brasil, não foram localizados estudos de validação de escalas psicossociais para a mudança de comportamento do consumo de frutas, legumes e verduras.…”