The relationship between exercise intensity and affective responses demystified: to crack the 40-year-old nut, replace the 40-year-old nutcracker!
BACKGROUND
A causal chain linking exercise intensity, affective responses (e.g., pleasure-displeasure), and adherence has long been suspected as a contributor to the public health problem of physical inactivity. However, progress in the investigation of this model has been limited, mainly due to inconsistent findings on the first link between exercise intensity and affective responses.


OBJECTIVE
The purpose was to reexamine the intensity-affect relationship using a new methodological platform.


METHODS
Thirty young adults (14 women and 16 men) participated in 15-min treadmill exercise sessions below, at, and above their ventilatory threshold. The innovative elements were the following: (a) Affect was assessed in terms of the dimensions of the circumplex model; (b) assessments were made repeatedly during and after exercise; (c) patterns of interindividual variability were examined; (d) intensity was determined in relation to the ventilatory threshold; and (e) hypotheses derived from the dual-mode model were tested.


RESULTS
Intensity did not influence the positive changes from pre- to post-exercise, but it did influence the responses during exercise, with the intensity that exceeded the ventilatory threshold eliciting significant and relatively homogeneous decreases in pleasure.


CONCLUSIONS
Exceeding the intensity of the ventilatory threshold appears to reduce pleasure, an effect that could negatively impact adherence.
Ekkekakis
Panteleimon
P
Department of Kinesiology, Iowa State University, 253 Barbara E. Forker Building, Ames, IA 50011, USA. ekkekaki@iastate.edu
Hall
Eric E
EE
Petruzzello
Steven J
SJ
D000328:Adult; D000339:Affect / Q000502:physiology*; D015308:Anaerobic Threshold / Q000502:physiology*; D001143:Arousal / Q000502:physiology; D002245:Carbon Dioxide / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007206:Individuality; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010100:Oxygen / Q000502:physiology; D011603:Psychophysiology; D012016:Reference Values
D002245:Carbon Dioxide; D019344:Lactic Acid; D010100:Oxygen