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Articles 1 - 4 of 4
Full-Text Articles in Exercise Science
The Effect Of Stride Frequencies On Running Performance At The Velocity Of Vo2max, Boram Lim
The Effect Of Stride Frequencies On Running Performance At The Velocity Of Vo2max, Boram Lim
Cal Poly Humboldt theses and projects
Running economy(RE) is considered to be a critical factor to improve running performance. Stride frequency(SF) is an important variable for determining RE. The importance of SF has gained more attention in recent years, especially for recreational runners. However, no previous research has investigated the interaction between running performance and SF at the velocity of VO2max. PURPOSE: To investigate the effect of five different SF variations on running performance until volitional fatigue at the velocity of VO2max. METHODS: Fourteen male recreational runners (Age = 25.8 ± 4.96 years, Height = 171 ± 6.2cm, Body Mass = 71.9 …
Physiological Responses At The Critical Heart Rate During Treadmill Running, Haley Bergstrom
Physiological Responses At The Critical Heart Rate During Treadmill Running, Haley Bergstrom
Department of Nutrition and Health Sciences: Dissertations, Theses, and Student Research
The purposes of this study were to: 1) determine if the critical heart rate (CHR) model for cycle ergometry can be applied to treadmill running; and 2) examine the times to exhaustion (Tlim) as well as the VO2, ratings of perceived exertion (RPE), electromyographic amplitude (EMG AMP) and mean power frequency (MPF) responses during constant heart rate (HR) runs at CHR-5 b·min-1 (CHR-5), CHR, and CHR+5 b·min-1 (CHR+5). Thirteen runners performed an incremental treadmill test to exhaustion. On separate days, 4 constant velocity runs to exhaustion were performed. The total number of heart beats …
Myocardial Hsp70 Phosphorylation And Pkc-Mediated Cardioprotection Following Exercise, C.W. Melling, David Thorp, Kevin Milne, Earl Noble
Myocardial Hsp70 Phosphorylation And Pkc-Mediated Cardioprotection Following Exercise, C.W. Melling, David Thorp, Kevin Milne, Earl Noble
Jamie Melling
Both protein kinase C (PKC) activation and Hsp70 expression have been shown to be key components for exercise-mediated myocardial protection during ischemia–reperfusion injury. Given that Hsp70 has been shown to undergo inducible phosphorylation in striated muscle and liver, we hypothesized that PKC may regulate myocardial Hsp70 function and subsequent exercise-conferred cardioprotection through this phosphorylation. Hence, acute exercise of male Sprague–Dawley rats (30 m/min for 60 min at 2% grade) was employed to assess the role of PKC and its selected isoforms in phosphorylation of Hsp70 and protection of the myocardium during ischemia-reperfusion injury. It was observed that administration of the …
Castration Inhibits The Exercise-Induced Accumulation Of Hsp70 In Male Rodent Cardiac Muscle Tissue, Kevin Milne, David Thorp, C.W. Melling, Earl Noble
Castration Inhibits The Exercise-Induced Accumulation Of Hsp70 In Male Rodent Cardiac Muscle Tissue, Kevin Milne, David Thorp, C.W. Melling, Earl Noble
Jamie Melling
Intense exercise leads to accumulation of the inducible member of the 70-kDa family of heat shock proteins, Hsp70, in male, but not female, hearts. Estrogen is at least partially responsible for this difference. Because androgen receptors are expressed in the heart and castration leads to decreases in calcium regulatory proteins and altered cardiac function, testosterone (T) or its metabolites could also be involved. We hypothesized that removal of endogenous T production through castration would reduce cardiac Hsp70 accumulation after an acute exercise bout, whereas castrated animals supplemented with 5α-dihydrotestosterone (DHT) would show the intact male response. Fifty-four 8-wk-old male Sprague-Dawley …