Search Results

You are looking at 1 - 10 of 1,435 items for :

  • All content x
Clear All
Restricted access

Lauren C. Benson and Kristian M. O’Connor

About half of all runners sustain a running-related injury every year. Exertion may contribute to risk of injury by altering joint mechanics. The purpose of this study was to examine the effects of exertion on runners’ joint mechanics using principal component analysis (PCA). Three-dimensional motion analysis of the lower extremity was performed on 16 healthy female runners before and after their typical training run. PCA was used to determine exertion-related changes in joint mechanics at the ankle, knee, and hip. Statistical significance for repeated-measures MANOVA of the retained principal components at each joint and plane of motion was at P < .05. Exercise effects were identified at the ankle (greater rate of eversion [PC2: P = .027], and decreased plantar flexion moment [overall: P = .044] and external rotation moment [PC3: P = .003]), knee (increased adduction [overall: P = .044] and internal rotation [PC3: P = .034], and decreased abduction moment [overall: P = .045]), and hip (increased internal rotation [PC1: P = .013] and range of mid- to late-stance rotation [PC2: P = .009], and decreased internal rotation moment [PC1: P = .001]). The observed changes in running mechanics reflect a gait profile that is often linked to running injury. The effects of more strenuous activity may result in mechanics that present an even greater risk for injury.

Restricted access

Abby R. Fleming, Nic Martinez, Larry H. Collins, Candi D. Ashley, Maureen Chiodini, Brian J. Waddell, and Marcus W. Kilpatrick

.5) with 80% power using a t test between means with alpha at .05 and a two-tailed test. The effect size (ES) used in the calculation is based on previous research from our laboratory evaluating exertion, affect, and enjoyment ( Kilpatrick, Greeley, & Collins, 2015 ; Martinez et al., 2015 ) and more

Restricted access

Luis Peñailillo, Karen Mackay, and Chris R. Abbiss

Rating of perceived exertion (RPE) is one of the most utilized measurements in exercise and sports science settings. Exercise-induced increases in psychophysiological stress are extremely important in many aspects of exercise capacity and performance including the development and perceptions of

Restricted access

Kenneth E. Games, Zachary K. Winkelmann, and Lindsey E. Eberman

Key Points ▸ Static and dynamic balance are negatively impacted following a physical exertion activity. ▸ The balance deficits identified in response to exertion may provide insights into the injury risk profiles of firefighters wearing a personal protective ensemble. ▸ Job-related tasks involving

Restricted access

Jenna Morogiello and Rebekah Roessler

Key Points ▸ First case report of exertional rhabdomyolysis (ER) in a noncontact intramural sport. ▸ Early recognition and treatment is crucial to prevent potentially fatal complications. ▸ Recreational sports pose a unique challenge for health care professionals. ▸ Highlights the need for athletic

Restricted access

Mohamed Saifeddin Fessi and Wassim Moalla

rating of perceived exertion (RPE) is a common simple, valid, reliable, and low-cost method that represents the athlete’s own perception of training stress and gives a complete indication of the global workload because it is indicative of both physiological and psychological load. 8 , 14 Accordingly

Restricted access

Margaret C. Morrissey, Michael R. Szymanski, Andrew J. Grundstein, and Douglas J. Casa

Exertional heat stroke (EHS) is a life-threatening condition characterized by an internal temperature ≥40°C with central-nervous-system dysfunction ( Casa et al., 2015 ). EHS is interesting to study when examining prevention strategies and factors that predispose individuals to develop the

Restricted access

Rebecca L. Dubas, Elizabeth F. Teel, Melissa C. Kay, Eric D. Ryan, Meredith A. Petschauer, and Johna K. Register-Mihalik

injury. 5 – 7 While the Sport Concussion Assessment Tool 5th Edition (SCAT-5) is now the current version, most key measures and the lack of administration guidelines are consistent across both tools. Exertion, or physical activity that causes cardiovascular stress or a sympathetic nervous response, can

Restricted access

Stijn Schouppe, Jessica Van Oosterwijck, Jan R. Wiersema, Stefaan Van Damme, Tine Willems, and Lieven Danneels

Fatigue is a disabling symptom that causes limitations in physical and cognitive function due to interactions between performance fatigability and perceived fatigability ( Enoka & Duchateau, 2016 ; Muller & Apps, 2018 ). Different types of exertion can induce fatigue ( Chaudhuri & Behan, 2004

Restricted access

Barbara E. Ainsworth, Robert G. McMurray, and Susan K. Veazey

The purpose of this study was to determine the accuracy of two submaximal exercise tests, the Sitting-Chair Step Test (Smith & Gilligan. 1983) and the Modified Step Test (Amundsen, DeVahl, & Ellingham, 1989) to predict peak oxygen uptake (VO2 peak) in 28 adults ages 60 to 85 years. VO2 peak was measured by indirect calorimetry during a treadmill maximal graded exercise test (VO2 peak, range 11.6–31.1 ml · kg −l · min−1). In each of the submaximal tests, VO2 was predicted by plotting stage-by-stage submaximal heart rate (HR) and perceived exertion (RPE) data against VO2 for each stage and extrapolating the data to respective age-predicted maximal HR or RPE values. In the Sitting-Chair Step Test (n = 23), no significant differences were observed between measured and predicted VO2 peak values (p > .05). However, predicted VO2 peak values from the HR were 4.3 ml · kg−1 · min−1 higher than VO2 peak values predicted from the RPE data (p < .05). In the Modified Step Test (n = 22), no significant differences were observed between measured and predicted VO2 peak values (p > .05). Predictive accuracy was modest, explaining 49–78% of the variance in VO2 peak. These data suggest that the Sitting-Chair Step Test and the Modified Step Test have moderate validity in predicting VO2 peak in older men and women.