promoted as a simple and practical method for gauging intensity in the free-living setting. 8 , 9 We previously described the calibration of cadence–intensity thresholds (ie, cadence values associated with increasing levels of intensity in a sample of young adults [age 21–40 y] during treadmill walking
Elroy J. Aguiar, Zachary R. Gould, Scott W. Ducharme, Chris C. Moore, Aston K. McCullough and Catrine Tudor-Locke
Rob van der Straaten, Oren Tirosh, William A. (Tony) Sparrow and Rezaul Begg
may facilitate treadmill-based gait training, but it is as yet unknown whether older individuals can modify MTC with augmented information. Figure 2 A young participant undertaking preferred speed treadmill walking with visual augmented information of MTC amplitude (MTC) provided using a real
Mhairi K. MacLean and Daniel P. Ferris
between human and machine included a waist belt, hard thigh and shin cuffs with soft straps, and a soft material loop around the shoe. Next, we tuned the controller parameters using the participant’s feedback while they performed different ambulatory tasks. The tasks included walking on a treadmill
Alexandra F. DeJong, L. Colby Mangum, Jacob E. Resch and Susan A. Saliba
thickness changes of the Gmax and Gmed muscles were examined during treadmill walking. Ultrasound images of the gluteal muscles were obtained during quiet stance as a normative measure, and 3 heel strike images were obtained during gait. In addition, a 10-second video clip of USI and Vicon motion capture
Claire Peel, Carolyn Utsey and Jan MacGregor
This study aimed to evaluate the effects of an 8-week supervised exercise program on physiological measurements during treadmill walking, muscle strength, functional performance, and health status in older adults limited in physical function. Twenty-four participants were randomly assigned to an exercise group (EG, N = 13) or a control group (CG, N = 11), and were evaluated before and after the exercise program (EG) or 8-week period (CG). Evaluations included a progressive treadmill lest, strength testing, the Physical Performance Test (PPT), and the SF-36 Health Survey. The exercise program consisted of 3 sessions per week of brisk walking and strengthening exercises. The EG demonstrated increases in cardiorespiratory fitness and increases in treadmill walking time. The EG also demonstrated increases in force production in 3 of the 6 muscle groups that were tested. Both the EG and CG demonstrated improvements in PPT scores and in 2 health concepts on the SF-36 Health Survey.
Stamatis Agiovlasitis, Jeffrey A. McCubbin, Joonkoo Yun, Michael J. Pavol and Jeffrey J. Widrick
This study examined whether the net rate of oxygen uptake (VO2net) and the net oxygen uptake per kilometer (VO2net/km) are affected during walking in adults with Down syndrome (DS) and whether their preferred walking speed (PWS) minimizes the VO2net/km. Respiratory gases were collected as 14 adults with DS and 15 adults without DS completed a series of treadmill walking trials. PWS was measured over 15 meters in a hallway. The VO2net and the VO2net/km were higher in adults with DS than adults without DS. The overground PWS normalized for leg length was the same for both groups and did not appear to minimize the VO2net/km. Thus, adults with DS are less economical during walking than adults without DS. The overground PWS does not minimize the metabolic cost during treadmill walking.
Viswanath B. Unnithan, Ellinor M. Kenne, Lynne Logan, Scott Collier and Margaret Turk
The aim of this study was to assess the effect of partial body weight support on the oxygen cost of treadmill walking in children and adolescents with spastic cerebral palsy (CP). Five children and adolescents (2 girls and 3 boys) with spastic CP (12.4 ± 3.6 years) volunteered for the study. Participants performed three 4-min tread mill walks on three separate days at their comfortable treadmill walking speeds. At each visit a different partial body weight harness setting was used. Significant (p < .05) differences in oxygen cost were found when the harness was worn but not connected to the support frame. Partial body weight support reduces the oxygen cost of walking in children and adolescents with spastic CP.
Jason J. Rutkowski, Robert J. Robertson, Wayland D. Tseh, Jennifer L. Caputo, Daniel J. Keefer, Kristin M. Sutika and Donald W. Morgan
The purpose of this investigation was to determine whether either the differentiated ratings of perceived exertion (RPE) for the legs (RPE-L) or chest (RPE-C) were higher than the overall body RPE (RPE-O) in children performing treadmill walking. A differentiated RPE that was higher than the RPE-O was considered the dominant perceptual signal. Thirty-one 10-year-old participants (16 boys, 15 girls) performed six separate 5-min bouts of level treadmill walking at different speeds. During each bout of exercise, RPEs were recorded using the modified Children’s OMNI Scale. Oxygen consumption (VO2), heart rate (HR), and ventilation (VE) were measured during Minutes 4 and 5 at each walking speed. VO2, HR, and VE increased as walking speed increased, as did perceived exertion. No differences were observed among RPE-O, RPE-L, and RPE-C at any speed. In addition, boys and girls exhibited similar responses for each perceptual and physiological variable. In conclusion, a dominant differentiated perceptual rating was not found at slow-to-moderate treadmill walking speeds for either boys or girls. Neither the respiratory–metabolic nor peripheral ratings of perceived exertion appeared to dominate the whole-body sensory-integration process in this sample.
Sally A. Sherman, Renee J. Rogers, Kelliann K. Davis, Ryan L. Minster, Seth A. Creasy, Nicole C. Mullarkey, Matthew O’Dell, Patrick Donahue and John M. Jakicic
Whether the energy cost of vinyasa yoga meets the criteria for moderate-to-vigorous physical activity has not been established.
To compare energy expenditure during acute bouts of vinyasa yoga and 2 walking protocols.
Participants (20 males, 18 females) performed 60-minute sessions of vinyasa yoga (YOGA), treadmill walking at a self-selected brisk pace (SELF), and treadmill walking at a pace that matched the heart rate of the YOGA session (HR-Match). Energy expenditure was assessed via indirect calorimetry.
Energy expenditure was significantly lower in YOGA compared with HR-Match (difference = 79.5 ± 44.3 kcal; P < .001) and SELF (difference = 51.7 ± 62.6 kcal; P < .001), but not in SELF compared with HR-Match (difference = 27.8 ± 72.6 kcal; P = .054). A similar pattern was observed for metabolic equivalents (HR-Match = 4.7 ± 0.8, SELF = 4.4 ± 0.7, YOGA = 3.6 ± 0.6; P < .001). Analyses using only the initial 45 minutes from each of the sessions, which excluded the restorative component of YOGA, showed energy expenditure was significantly lower in YOGA compared with HR-Match (difference = 68.0 ± 40.1 kcal; P < .001) but not compared with SELF (difference = 15.1 ± 48.7 kcal; P = .189).
YOGA meets the criteria for moderate-intensity physical activity. Thus, YOGA may be a viable form of physical activity to achieve public health guidelines and to elicit health benefits.
Lee E.F. Graves, Nicola D. Ridgers, Karen Williams, Gareth Stratton, Greg Atkinson and Nigel T. Cable
Active video games (exergames) increase energy expenditure (EE) and physical activity (PA) compared with sedentary video gaming. The physiological cost and enjoyment of exergaming in adolescents, and young and older adults has not been documented, nor compared with aerobic exercise. This study compared the physiological cost and enjoyment of exergaming on Wii Fit with aerobic exercise in 3 populations.
Cardiorespiratory and enjoyment measurements were compared in 14 adolescents, 15 young adults, and 13 older adults during handheld inactive video gaming, Wii Fit activities (yoga, muscle conditioning, balance, aerobics), and brisk treadmill walking and jogging.
For all groups EE and heart rate (HR) of Wii Fit activities were greater than handheld gaming (P < .001) but lower than treadmill exercise (P ≤ .001). Wii aerobics elicited moderate intensity activity in adolescents, young adults, and older adults with respective mean (SD) metabolic equivalents of 3.2 (0.7), 3.6 (0.8), and 3.2 (0.8). HR during Wii aerobics fell below the recommended intensity for maintaining cardiorespiratory fitness. Group enjoyment rating was greater for Wii balance and aerobics compared with treadmill walking and jogging (P ≤ .05).
Wii Fit appears an enjoyable exergame for adolescents and adults, stimulating light-to-moderate intensity activity through the modification of typically sedentary leisure behavior.