Self-selected exercise intensity of habitual walkers.
ABSTRACT This study assessed self-selected exercise intensity of habitual walkers. Twenty-nine healthy adults (22 females, 7 males; age (mean +/- SD) = 34.9 +/- 8.6 yr) performed a typical exercise walk while walking speed was measured by an unseen observer. On a subsequent occasion, the subjects walked at the same pace on a treadmill while several variables related to exercise intensity were measured. The mean self-selected walking pace was 1.78 +/- 0.19 m.s-1. Mean percents of VO2max and HRmax elicited by the treadmill exercise were 52 +/- 11% and 70 +/- 9%, respectively. Mean MET level was 5.2 +/- 1.2, and ratings of perceived exertion (RPE) averaged 10.9 +/- 1.6. Based on reported frequency and duration of walking, weekly energy expenditure in exercise walking was estimated to be 1127 +/- 783 kcal.wk-1. These data suggest that the self-selected exercise intensity of healthy, habitual exercise walkers meets the American College Sports Medicine's recommendation for improvement of cardiorespiratory fitness. These data further suggest that, in this population, the average weekly energy expended through walking reaches a level associated with improvements in health and longevity.
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ABSTRACT: RÉSUMÉ Contexte : Cette étude visait : 1) à évaluer la qualité des podomètres promotionnels distribués à grande échelle dans les boîtes de céréales lors de l'édition 2004 de la campagne Canada en mouvement; et 2) à établir une batterie de protocoles d'essai pour orienter le consensus futur autour des normes industrielles de qualité des podomètres. Méthode : Quinze compteurs de pas Special K* de Kellogg (« podomètres K » ou « K »; fabriqués pour Kellogg Canada par Sasco, Inc.) et neuf podomètres Yamax (Yamax; Yamax Corporation de Tokyo, au Japon) ont été testés sur neuf personnes. Nous leur avons fait subir : 1) un test de 20 pas; 2) un test en milieu conditionné sur tapis roulant à 80 m . min -1 (3 milles . h -1) et en automobile; et 3) un test de 24 heures en milieu naturel, par rapport aux résultats d'un accéléromètre. Résultats : Cinquante-trois p. cent des podomètres K ont réussi le test des 20 pas, contre 100 % des Yamax. Le pourcentage d'erreur absolu moyen du K durant la marche sur tapis roulant était de 24,2±33,9, contre 3,9±6,6% pour le Yamax. Le K a décelé 5,7 fois plus de non-pas que le Yamax lors du test en automobile. En milieu naturel, le pourcentage d'erreur absolu moyen par rapport à un accéléromètre ActiGraph était de 44,9±34,5 % pour le K et de 19,5±21,2 % pour le Yamax.
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ABSTRACT: To compare the physiological, perception and affective responses during treadmill walking at a self-selected pace by previously sedentary women from three age groups. Methods: Sixty-six healthy women were assigned into three groups according to their age: GI (20.0-25.0 yr, n = 22), GII (30.0-35.0 yr, n = 22) and GIII (40.0-45.0 yr, n = 22). Each participant performed (i) an initial medical screening, anthropometric assessment and familiarization; (ii) an incremental treadmill test to determine O2max; and (iii) a 20-min treadmill walking bout at a self-selected pace. During the 20-min of treadmill walking at a self-selected pace, the physiological (oxygen uptake, O2 and heart rate, HR) responses were continuously recorded. The perception (Borg-RPE for the overall body, 6-20) and affective (Feeling Scale) responses were measured every 5 min throughout the test. One-way ANOVA was used for statistical analysis (p < 0.05). Results: one-way ANOVA demonstrated that there were not significant differences in O2 and HR during a 20-min treadmill walking bout at a self-selected pace among the three age groups. However, the % O2Max, % O2LV, %FCMax, and %FCLV were significantly higher in GIII compared with GI and GII (p < 0.05). Finally, the perception and affective responses during a 20-min treadmill walking bout at a self-selected pace were similar among the three age groups. CONCLUSION: These findings demonstrated that the physiological but not the perception and affective responses to treadmill walking at a self-selected pace by sedentary women, did differ according to their age group.Revista Brasileira de Medicina do Esporte 10/2010; 16(5):329-334. · 0.16 Impact Factor
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ABSTRACT: Background: Positive affective responses can lead to improved adherence to exercise. This study sought to examine the affective responses and exercise intensity of self-selected exercise in adolescent girls. Methods: An observational study where twenty seven females (Age M = 14.6 ± 0.8 years) completed three 20-minute exercise sessions (2 self-selected and 1 prescribed intensity) and a graded exercise test. The intensity of the prescribed session was matched to the first self-selected session. Intensity, affective responses and ratings of perceived exertion were recorded throughout the sessions and differences examined. Repeated measures ANOVAs were conducted to examine differences. Results: There were no significant differences in intensity between the prescribed and self-selected sessions, but affective responses were significantly more positive (p < .01) during the self-selected session. Ratings of perceived exertion were significantly lower (p < .01) during the self-selected session than the prescribed session. On average participants worked at 72% _ V O 2 peak; well within the intensity recommended by the American College of Sports Medicine. Conclusion: Even though the intensity did not differ between the self-selected and prescribed sessions, there was a significant impact on affective responses, with more positive affective responses being elicited in the self-selected session. This highlights the importance of autonomy and self-paced exercise for affective responses and may have potential long-term implications for adherence.BMC Sports Science, Medicine, and Rehabilitation. 10/2014; 6(35).