A turn control
strategy is proposed in order to improve environmental adaptability of a
quasi-passive walking robot by utilizing a mechanical oscillator. The target
trajectory of the fmechanical oscillator is determined by online
planning of its period, phase, amplitude and angle of the central axis of
oscillation. The motion of the mechanical oscillator is always entrained with the rocking motion of
the robot based on forced entrainment in order to stabilize the robot. The turn
radius can be controlled by adjusting the inclination angle of the central axis
of the mechanical oscillator movement, and the control method is numerically
and experimentally examined. Results
show that the robot can turn with different radius and it is possible for the
robot to walk in various environments.
Finally, the gait of turn is compared with that of straight walking and
analyzed in terms of mechanical work and energy.
a growing body of research indicating that dog walking contributes to meeting
physical activity (PA) guidelines, this literature is limited by the use of
self-report measures of dog walking and overall PA. The objectives of this
pilot study were to objectively assess dog walking with accelerometry,
characterize the frequency, duration, and intensity of dog walking, and
determine the contribution of dog walking to overall moderate-vigorous physical
activity (MVPA). Methods: Sixty-five dog owners wore an Actigraph GT3X
accelerometer for up to 7 consecutive days and recorded start/end times for dog
walks with daily log sheets. Each minute with an activity count ≥ 760 was classified
as MVPA. Descriptive statistics were used to summarize all variables. Logistic
regression was used to examine associations between dog walking MVPA bouts and
meeting PA guidelines, controlling for age, education, income, and gender.
Results: Participants walked their dog an average of 1.2 ± 1.1 times/day,
averaged 28.0 ± 15.6 minutes/walk, and accumulated 22.9 ± 17.5 minutes of
MVPA/day during dog walks, of which 21.7 ± 17.9 minutes were accumulated in
bouts ≥10 minutes. Seventy-eight percent of dog walking was classified as
moderate-intensity and 3.5% was vigorous. Dog walking MVPA had a statistically
significant positive association with meeting PA guidelines (OR = 2.32; 95% CI =
1.06, 5.08). Conclusions: The majority of dog walking minutes were moderate-intensity
and most minutes of MVPA during dog walking occurred in bouts. These findings
suggest that dog walking is consistent with current PA guidelines for adults
and should receive more consideration as a PA promotion strategy.
Walking buses are a way to increase physical activity by encouraging people to walk rather than rely on motorized forms of transportation. Several communities support walking school buses as an alternative mode of pupil transportation to schools. A possible extension of this concept is the introduction of adult walking buses. Given the novelty of the concept, very little is currently known about the public’s perceptions regarding adult walking buses and their potential effectiveness to increase physical activity and decrease obesity among adults. To bridge this gap, this study examined motivations and barriers to participation in an adult walking bus program in Birmingham, Alabama using a comprehensive questionnaire survey. Analysis of over 340 responses revealed a positive reception of the concept among the survey responders. More specifically, 60.1% of the sample reported they would definitely or probably participate in a walking bus program. Results from nested ordinal logistic regression analysis indicate that health benefits are the strongest motivation for willingness to participate in a walking bus program. Sensitivity to environmental issues is also a significant predictor of willingness to participate across models. The most significant barrier to willingness to participate in a walking bus program is limited time. The significance of demographic variables (obesity, race/ ethnicity, and age) as predictors of willingness to participate is reduced once motivations and barriers are controlled. In conclusion, the positive response to the program among our sample is encouraging and suggests that adult walking buses should be explored further as an active alternative transportation option with a potential to improve the health and wellbeing of participants.