Rebecca A. Battista

Perception of fatigue during simulated competition

BACKGROUND Previous studies suggest that the rating of perceived exertion (RPE) increases during steady-state, open-loop exercise in proportion to the relative time to fatigue. This suggests that RPE is scalar and integrates physiological status and homeostatic disturbances. PURPOSE This study assessed the relationship between the rate of change in RPE, and relative distance in time trials at distances of 2.5, 5, and 10 km. It also assessed the rate of change in RPE during 5-km time trials while breathing hypoxic air. METHODS The subjects were well-conditioned cyclists. In part 1, each subject completed habituation time trials, and then randomly ordered time trials at each distance. The category ratio RPE was measured in 10% increments throughout each trial. In part 2, each subject completed three 5-km time trials while breathing different inspired gas mixtures (FiO2 = 0.2093 throughout the trial, FiO2 = 0.15 between 2 and 4 km, and FiO2 = 0.15 between 2.5 and 4 km). RPE was measured at 10% increments. RESULTS In part 1, when RPE was plotted against relative distance, there was no significant difference in the growth of RPE at proportional distances. In part 2, the decrease in power output during the hypoxic segments was sufficient that the growth of RPE was the same at each proportional distance. In both parts of the study, an RPE of 5 (hard) was achieved after 20% of the time trial distance, and an RPE of 8 was achieved after 80% distance. CONCLUSIONS This study supports the hypothesis that RPE increases similarly in relation to relative distance, regardless of the distance performed, and it suggests that the perception of effort has scalar properties.

Pattern of developing the performance template

Background: The pattern of energy expenditure during sustained high-intensity exercise is influenced by several variables. Data from athletic populations suggest that a pre-exercise conceptual model, or template, is a central variable relative to controlling energy expenditure. Aims: The aim of this study was to make systematic observations regarding how the performance template develops in fit individuals who have limited specific experience with sustained high-intensity exercise (eg, time trials). Methods: The study was conducted in four parts and involved measuring performance (time and power output) during: (A) six 3 km cycle time trials, (B) three 2 km rowing time trials, (C) four 2 km rowing time trials with a training period between trials 2 and 3, and (D) three 10 km cycle time trials. All time trials were self-paced with feedback to the subjects regarding previous performances and momentary pace. Results: In all four series of time trials there was a progressive pattern of improved performance averaging 6% over the first three trials and 10% over six trials. In all studies improvement was associated with increased power output during the early and middle portions of the time trial and a progressively greater terminal rating of perceived exertion. Despite the change in the pattern of energy expenditure, the subjects did not achieve the pattern usually displayed by athletes during comparable events. Conclusions: This study concludes that the pattern of learning the performance template is primarily related to increased confidence that the trial can be completed without unreasonable levels of exertion or injury, but that the process takes more than six trials to be complete.

Physiologic responses during indoor cycling.

Battista, RA, Foster, C, Andrew, J, Wright, G, Lucia, A, and Porcari, JP. Physiologic responses during indoor cycling. J Strength Cond Res 22: 1236-1241, 2008-During the last decade, there has been active interest in indoor cycling (e.g., spinning) as a method of choreographed group exercise. Recent studies have suggested that exercise intensity during indoor cycling may be quite high and may transiently exceed &OV0312;o2max. This study sought to confirm these findings, as the apparent high intensity of indoor cycling has implications for both the efficacy and the risk of indoor cycling as an exercise method. Twenty healthy female students performed an incremental exercise test to define &OV0312;o2max and performed 2 videotaped indoor exercise classes lasting 45 minutes and 35 minutes. &OV0312;o2, heart rate (HR), and rating of perceived exertion (RPE) were measured during the indoor cycling classes, with &OV0312;o2 data integrated in 30-second intervals. The mean %&OV0312;o2max during the indoor cycling classes was modest (74 ± 14%&OV0312;o2max and 66 ± 14%&OV0312;o2max, respectively). However, 52% and 35% of the time during the 45- and 35-minute classes was spent at intensities greater than the ventilatory threshold (VT). The HR response indicated that 35% and 38% of the session time was above the HR associated with VT. In 10 of the 40 exercise sessions, there were segments in which the momentary &OV0312;o2 exceeded &OV0312;o2max observed during incremental testing, and the cumulative time with exercise intensity greater than &OV0312;o2max ranged from 0.5 to 14.0 minutes. It can be concluded that although the intensity of indoor cycling in healthy, physically active women is moderate, there are frequent observations of transient values of &OV0312;o2 exceeding &OV0312;o2max, and a substantial portion of the exercise bouts at intensities greater than VT. As such, the data suggest that indoor cycling must be considered a high-intensity exercise mode of exercise training, which has implications for both efficacy and risk.

Comparisons of physical characteristics and performances among female collegiate rowers

Abstract The physical characteristics and performances of female collegiate rowers were examined from two perspectives: level (novice, varsity) and years of participation (0, 1, 2, 3) in collegiate rowing. The participants were 90 female collegiate rowers from three US Division I university teams, of the National Collegiate Athletic Association (NCAA). Height, body mass, sitting height, arm span, skinfolds, limb circumferences, and skeletal breadths were measured. Leg length was estimated and Heath-Carter anthropometric somatotypes were calculated. Performance measures included lower-back flexibility, vertical jump, and 2-km time on a rowing ergometer. Descriptive statistics were calculated for the total sample and by level and years of experience. Multivariate analysis of variance and a Bonferroni-adjusted alpha level (P < 0.05) were used to test differences. Varsity rowers had significantly more rowing experience (∼0.5 years) before college, higher vertical jumps (∼3 cm), faster 2-km times (∼25 s), and lower endomorphic characteristics than novice rowers. Anthropometric and performance differences among rowers by years of experience were negligible with the exception of slower 2-km times (∼32 s) in rowers with no collegiate experience than rowers with collegiate experience. In conclusion, collegiate rowers differ to some extent in physical and performance characteristics by level and experience.

Improving the physical activity and nutrition environment through self-assessment (NAP SACC) in rural area child care centers in North Carolina

OBJECTIVE To determine if child care centers in rural, Western North Carolina met recommendations for nutrition and physical activity, if focusing on nutrition and physical activity practices and policies was effective in improving the center environment, and if differences existed between centers affiliated or unaffiliated with schools. METHODS Of 33 child care centers in three counties, 29 submitted mini-grant requests and participated in a pre-post evaluation using Nutrition and Physical Activity Self-Assessment for Child Care (NAP SACC). NAP SACC assesses compliance for nutrition and physical activity recommendations and standards. Between October 2011 and April 2012, centers participated in workshops and goal setting specific to nutrition and physical activity. RESULTS At baseline, over 95% of the centers met all recommendations. However, post-intervention, Wilcoxon Signed Ranks Test (p<0.05) indicated significant improvement across center types in five out of 37 nutrition and seven out of 17 physical activity standards following the intervention. Centers unaffiliated with schools made significant changes in ten nutrition standards, while those affiliated with schools improved in only two standards and decreased on one standard. CONCLUSION Overall, rural child care centers in Western North Carolina were meeting standards, they were still able to strengthen policies and practices by following NAP SACC. This was especially true for centers unaffiliated with schools. Continued financial support may assist centers in sustaining increased physical activity in children.

The Risk in Exercise Training

Although exercise training is unequivocally of benefit relative to the risk of cardiovascular disease, there is a definable risk of complications during exercise training. In younger individuals, the risk is almost exclusively related to the presence of congenital abnormalities, whereas in older (∼40 years) individuals, the risk is largely related to atherosclerotic disease. In both groups, the risk of the underlying pathology leading to clinical presentation is increased by higher intensity exercise. In older individuals, preexercise screening is of potential benefit but is not generally well done. Exercise prescription should favor lower intensity exercise during the early weeks of an exercise program. Subjective methods, which do not rely on the results of an exercise test, including the Rating of Perceived Exertion and the Talk Test, are to be recommended because preliminary exercise testing is performed inconsistently. There are inadequate data regarding the spontaneous exercise training intensity in both healthy individuals and patients.

Pediatrician prescriptions for outdoor physical activity among children: A pilot study

Research indicates that promoting time spent in the outdoors and outdoor physical activity increases childrens daily physical activity and improves health. One method showing promise is doctor prescriptions for outdoor physical activity for children; however, no empirical evidence currently exists on prescriptions for childrens outdoor physical activity. A pilot study was conducted at one pediatric practice in western North Carolina during 2015 to test the feasibility and potential effectiveness of conducting an outdoor physical activity prescription program for children aged 5–13 years. Three pediatricians wrote prescriptions for children (n = 38), discussed benefits of outdoor physical activity, and provided information packets to parents on nearby places for physical activity. Parents of patients of five pediatricians served as control (n = 32). Prior to seeing a pediatrician, parents completed a baseline survey that asked height and weight, assessed their views of childrens physical activity, and their personal and childs physical activity/sedentary behaviors. A nurse measured childrens height and weight. Parents were emailed one-month and three-month follow-up surveys that asked the questions listed above. Changes in childrens physical activity, outdoor physical activity, time spent in the outdoors, and sedentary activities were not significant between intervention and control groups. About half of parents (49%) viewed prescriptions as beneficial for their children and most used the intervention materials at home (70%). A larger study is needed to assess whether prescriptions increase childrens physical activity. A critical examination of the intervention, pilot study design, and suggestions for a larger future study are provided.

Index of mechanical efficiency in competitive and recreational long distance runners

Abstract The purpose of this investigation was to compare external work and net energy expenditure during a bout of repetitive stretch-shortening cycles between competitive and recreational long-distance runners. Participants were divided into either competitive or recreational runners based on their maximal oxygen consumption and self-reported 1600 m times. The stretch-shortening cycle involved a repetitive hopping protocol on a force plate while measuring oxygen consumption and lactate accumulation for a total of 10 min. External work and net energy expenditure were calculated for 3 min after steady state was achieved and the ratio between these variables was utilised as an index of mechanical efficiency. Lower extremity stiffness was calculated during this interval as well. Net energy expenditure was significantly lower in competitive runners (152.6 ± 33.3 kJ) in comparison to recreational runners (200.6 ± 41.4 kJ) (P = 0.02) given similar amounts of external work performed in both groups (competitive runners = 65.6 ± 20.1 kJ, recreational runners = 68.8 ± 12.1 kJ) (P = 0.67). Index of mechanical efficiency was significantly different between competitive runners (43.2 ± 9.0%) and recreational runners (34.8 ± 5.3%) (P = 0.03). No significant differences were found in lower extremity stiffness (P = 0.64). Competitive distance runners can perform similar levels of external work with lower net energy expenditure and thus a higher index of mechanical efficiency during repetitive stretch-shortening cycles in comparison to recreational runners with similar values of lower extremity stiffness. This ability could possibly be due differences in muscle–tendon length changes, muscle pre-activation, cross-bridge potentiation and short-latency reflex responses as a result of training which should be considered for future investigation.

Active living in rural Appalachia: Using the rural active living assessment (RALA) tools to explore environmental barriers

People residing in rural communities are more likely to be physically inactive and subsequently have elevated risks for chronic disease. Recent evidence has shown this could stem from environmental barriers, inadequate programming and policies directed at the promotion of physical activity (PA) in rural settings. The objective of this research was to assess active living features in rural towns and townships (n = 16) across seven counties in northwestern North Carolina (NC). The study utilized the Town-Wide and Street Segment components of the Rural Active Living Assessment (RALA) as well as the 2014 American Community Survey results. The assessments were conducted in the summer of 2016 in the rural Appalachia region of NC. Using the RALA town-wide assessment scoring system (0 − 100), the range of scores was 18–84, with the mean being 50.06. Three towns had no sidewalks, nine towns had sidewalks on only one side of the main streets, and four had sidewalks on both sides of the main streets. One town was rated as highly walkable, seven towns as moderately walkable, five towns as moderately unwalkable, and three towns as highly unwalkable. The rural Appalachia region of NC offers unique topographic, geographic and environmental barriers to PA. However, our findings indicate many rural towns offer common PA amenities. Future research should utilize qualitative methods and a community-based participatory research approach to more fully understand the challenges with increasing PA in the rural and often isolated Appalachia communities.

The Use of Geocaching as a Form of Physical Activity in Youth

ABSTRACT Background: In order to promote physical activity among youth, it is critical that communities offer options beyond sports that still provide similar health benefits. Purpose: Given the appeal of technology among today’s youth, the purpose of our study was to evaluate geocaching as a technology-based platform for promoting physical activity in youth. Methods: High school youth (N = 31) participated in 2 separate activity sessions, walking and geocaching. Accelerometers were worn and questions concerning perceived exertion and enjoyment were addressed at both sessions. Results: Although repeated measures t tests (P < .05) revealed no significant differences between activity sessions, each session yielded approximately 60 minutes of physical activity in a relatively inactive sample of youth. Additionally, the youth from the study reported that both walking and geocaching were enjoyable and relatively easy activities. Discussion: Results from this study do not suggest that geocaching would lead to greater activity levels than walking. Rather, geocaching was found to promote activity levels similar to walking. Translation to Health Education Practice: Given its use of technology and its application of challenge, geocaching may instead generate more interest than walking, leading to an increased interest among youth and, ultimately, an associated potential for additional physical activity.