On the Relation Between Leg Motion Rate and Speech Tempo During Submaximal Cycling Exercise.

PURPOSE: This study investigated whether temporal coupling was present between lower limb motion rate and different speech tempi during different exercise intensities. We hypothesized that increased physical workload would increase cycling rate and that this could account for previous findings of increased speech tempo during exercise. We also investigated whether the choice of speech task (read vs. spontaneous speech) affected results. METHOD: Forty-eight women who were ages 18-35 years participated. A within-participant design was used with fixed-order physical workload and counterbalanced speech task conditions. Motion capture and acoustic data were collected during exercise and at rest. Speech tempo was assessed using the amplitude envelope and two derived intrinsic mode functions that approximated syllable-like and footlike oscillations in the speech signal. Analyses were conducted with linear mixed-effects models. RESULTS: No direct entrainment between leg cycling rate and speech rate was observed. Leg cycling rate significantly increased from low to moderate workload for both speech tasks. All measures of speech tempo decreased when participants changed from rest to either low or moderate workload. CONCLUSIONS: Speech tempo does not show temporal coupling with the rate of self-generated leg motion at group level, which highlights the need to investigate potential faster scale momentary coupling. The unexpected finding that speech tempo decreases with increased physical workload may be explained by multiple mental and physical factors that are more diverse and individual than anticipated. The implication for real-world contexts is that even light physical activity-functionally equivalent to walking-may impact speech tempo.

Evaluation of a mandatory theory-based physical activity course on motivation among predominantly Hispanic college students.

ObjectiveThe present study aims to examine the impacts of a mandatory physical activity (PA) course on exercise motivation among predominately Hispanic college students. The course was designed based on the Self-Determination Theory to increase students' PA motivation. Methods: A total of 383 college students (nmales=126; nfemales=257; Mage=19.6; 67.6% Hispanic/Latino[a]) participated in the course and completed the Behavioral Regulation to Exercise Questionnaire-2 at the beginning (pretest) and the end of the course (post-test). This questionnaire measured five motivation constructs: amotivation, intrinsic motivation, extrinsic motivation, introjected regulation, and identified regulation. Results: Findings showed significant increases from pretest to post-test in all five motivation constructs (ps < 0.01). Conclusions: Although the mandatory PA curriculum successfully increased the intrinsic motivation, extrinsic motivation, introjected regulation, and identified regulation among college students, amotivation was also increased. These outcomes suggested some positive impacts on Hispanic college students' motivation to participate in PA. Findings can assist researchers and educators in developing, implementing, and evaluating required PA courses in colleges and universities.

Postnatal stress of early weaning exacerbates behavioral outcome in prenatal alcohol-exposed juvenile rats.

Some of the behavioral deficits caused by prenatal or postnatal alcohol exposure have been demonstrated to be ameliorated by environmental manipulations such as handling or environmental enrichment. This experiment, in contrast, investigated whether behavioral deficits due to prenatal alcohol exposure could be exacerbated by a stressful experience, early weaning. Pregnant dams were given either a liquid diet with 35% of the calories derived from alcohol, a liquid diet without alcohol to control for any effects of the liquid diet administration, or ad libitum food and water. Half of each litter were weaned at 15 days of age (early weaning) and half were weaned at 21 days of age (normally weaned). Offspring were weighed, tested for activity in an open field at 18 days of age, and trained to find a hidden platform in the Morris water maze at 22-24 days of age. Alcohol-exposed subjects who were weaned early were more impaired in spatial navigation ability than any other group. Similarly, the combination of early weaning and prenatal alcohol exposure caused the slowest growth. All subjects exposed to alcohol, regardless of weaning condition, had greater latencies to find the platform than those from the two control groups. There was no synergistic effect of alcohol and stress on activity levels, but all early-weaned females were more active than normally weaned females; males did not show this effect. Thus, environmental stressors such as early weaning can compound detrimental symptoms of prenatal alcohol exposure. These results have implications for the understanding of the effects of the environment on neuronal plasticity.