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Table 1 Description of the assessed variables

From: Profiling physical activity motivation based on self-determination theory: a cluster analysis approach

Concept Questionnaire # items Example question α
External regulation Exercise Self-Regulation Questionnaire (SRQ-E) 4 I try to be sufficiently physically active because others would be angry at me if I did not. .73
    Totally disagree (1) - Totally agree (7)  
Introjected regulation Exercise Self-Regulation Questionnaire (SRQ-E) 4 I try to be sufficiently physically active because I feel guilty if I do not exercise regularly. .73
    Totally disagree (1) - Totally agree (7)  
Identified regulation Exercise Self-Regulation Questionnaire (SRQ-E) 4 I try to be sufficiently physically active because exercising helps me feel better. .88
    Totally disagree (1) - Totally agree (7)  
Intrinsic motivation Exercise Self-Regulation Questionnaire (SRQ-E) 4 I try to be sufficiently physically active because it’s fun. .88
    Totally disagree (1) - Totally agree (7)  
Interest/enjoyment Intrinsic Motivation Inventory (IMI) 7 I enjoy being physically active. .92
    Totally disagree (1) - Totally agree (7)  
Perceived competence Intrinsic Motivation Inventory (IMI) 6 I think I am pretty good at physical activities. .87
    Totally disagree (1) - Totally agree (7)  
Effort/importance Intrinsic Motivation Inventory (IMI) 5 I put a lot of effort into physical activities. .82
    Totally disagree (1) - Totally agree (7)  
Pressure / tension Intrinsic Motivation Inventory (IMI) 5 During physical activities, I am very tense .82
    Totally disagree (1) - Totally agree (7)  
Perceived choice Intrinsic Motivation Inventory (IMI) 7 I feel that it is my own choice to perform physical activities. .81
    Totally disagree (1) - Totally agree (7)  
Value/usefulness Intrinsic Motivation Inventory (IMI) 7 I believe being physically active could be valuable to me. .88
    Totally disagree (1) - Totally agree (7)  
Intention (Sheeran & Orbell 1999) 3 To what extent are you planning to be sufficiently physically active? .93
    Not at all (1) - Very much (10)  
Commitment (Webb & Sheeran 2005) 3 How committed are you to being physically active? .82
    Not at all (1) - Very much (5)