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  • Author: Oldemar Mazzardo x
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Michael Pereira da Silva, Fabio Eduardo Fontana, Eric Callahan, Oldemar Mazzardo and Wagner De Campos

Background:

The aim of this systematic review was to identify the most optimal step-count cutoff for children and adolescents (5–19 years old) among guidelines currently available in the literature.

Methods:

The databases searched were PubMed, SportDiscus, Science Direct, Web of Science and LILACS. Studies were categorized into Health Cohort studies or Physical Activity (PA) Cohort studies according to the reference standard used. The quality of the studies was assessed using the QUADAS-2 instrument.

Results:

Six Health and 3 PA Cohort studies were included in the final pool of papers after Full Text reading. With the exception of a single study, studies demonstrated a high risk of methodological bias in at least 1 of the QUADAS-2 domains. Guidelines ranged from 10,000 to 16,000 steps/day for the Health studies (5–16 years old), and from 9,000 to 14,000 steps/day for PA studies (6–19 years old). Due to the high risk of methodological bias, none of the Health Cohort guidelines were endorsed. The PA Cohort study with the lowest risk of methodological bias suggested 12,000 steps/day for children and adolescents irrespective of gender.

Conclusion:

PA Cohort studies demonstrated lower risk of methodological bias than Health Cohort studies. The optimal youth step-count guideline of 12,000 steps/day was endorsed.

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Fabio E. Fontana, Oldemar Mazzardo, Comfort Mokgothu, Ovande Furtado Jr. and Jere D. Gallagher

The aim of this study was to examine the decision-making performance of experienced and inexperienced soccer players at four exercise intensities (rest, 40%, 60%, and 80% maximal aerobic power). The decision-making performance of inexperienced players was expected to demonstrate an inverted-U shape with increasing levels of exercise. For the experienced players, decision making was predicted to show no change in performance with increased exercise intensity. Thirty-two adult soccer players (16 experienced, 16 inexperienced) were asked to answer seven decision-making questions as quickly and accurately as possible for each exercise intensity. Results indicated that exercise does not affect the accuracy of decision making; however, the speed of decision making for experienced and inexperienced players improved with increased exercise intensity. These results suggest that physiologically induced arousal only affects speed of decision making.

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Gislaine Cristina Vagetti, Valter Cordeiro Barbosa Filho, Natália Boneti Moreira, Valdomiro de Oliveira, Oldemar Mazzardo and Wagner de Campos

This study examined whether the weekly volume and frequency of moderate to vigorous physical activity (MVPA) and light walking (LW) were associated with quality of life (QOL) domains of 1,806 older women from Brazil. The WHOQOL-BREF and WHOQOL-OLD instruments were used to measure QOL, while the weekly volume and frequency of MVPA and LW were assessed by IPAQ. An ordinal logistic regression was used as a measure of association. The weekly volumes of MVPA and LW were associated with several domains of QOL. Higher frequency of MVPA was associated with better scores in 10 QOL domains. The weekly frequency of LW, in turn, was associated with all QOL domains. In conclusion, promoting active transport and encouraging physical activity in older adults, for at least 150 min and distributed several days per week, help to increase QOL.