This study tested the hypothesis that elevation of heat stress proteins by whole body hyperthermia is associated with a decrease in skeletal muscle atrophy induced reduced contractile activity (i.e. , hindlimb unweighting). Female adult rats (6 mo old) were assigned to one four experimental groups (n = 10/group): 1) sedentary control (Con), 2) (Heat), 3) unweighting (HLU), or 4) before (Heat+HLU). Animals Heat and Heat+HLU exposed 60 min (colonic temperature approximately 41.6 degrees C)....

Experimental studies examining the effects of regular exercise on cardiac responses to ischemia and reperfusion (I/R) are limited. Therefore, these experiments examined endurance training myocardial biochemical physiological during in vivo I/R. Female Sprague-Dawley rats (4 mo old) were randomly assigned either a sedentary control group or an group. After 10-wk program, animals anesthetized mechanically ventilated, chest was opened by thoracotomy. Coronary occlusion achieved ligature around...

These experiments examined the independent effects of short-term exercise and heat stress on myocardial responses during in vivo ischemia-reperfusion (I/R). Female Sprague-Dawley rats (4 mo old) were randomly assigned to one four experimental groups: 1) control, 2) 3 consecutive days treadmill [60 min/day at 60–70% maximal O 2 uptake (V˙o max )], 3) 5 (60 60–70%V˙o ), 4) whole body (15 min 42°C). Twenty-four hours after or exercise, animals anesthetized mechanically ventilated, chest was...

This study investigated the effects of exercise training duration on myosin heavy chain (MHC) isoform distribution in rat locomotor muscles. Female Sprague-Dawley rats (120 days old) were assigned to either a sedentary control group or one three endurance groups. Trained animals ran treadmill at approximately 75% maximal O2 uptake for 10 wk (4-5 days/wk) different durations (30, 60, 90 min/day). Training resulted increases (P < 0.05) citrate synthase activity soleus and extensor digitorum...

Abstract Abundant evidence indicates that skeletal muscle plays a key role in regulating metabolic homeostasis. Therefore, maintaining healthy muscles is essential to good health. While prolonged inactivity known cause oxidative stress and loss, it remains unclear whether shift from an active sedentary lifestyle induces similar effects. This study tested the hypothesis transitioning rapidly leads loss load‐bearing soleus muscle. Adult Wistar rats were randomly divided into control (CON; n =...

The effects of chronic exercise training on the expression heat shock protein (HSP) in skeletal muscle senescent animals are unknown. Therefore, purpose this study was to investigate HSP both young and old rats.Young adult (3 months) (23 female Fisher 344 rats were assigned either a sedentary control or an endurance trained group (N = 6 per group). Exercised ran (60 min.d-1, 5 d.wk-1) treadmill at approximately 77% VO2peak for 10 wk. After completion program, soleus (SOL), plantaris (PL),...

Exercise training reduces myocardial lipid peroxidation following short-term ischemia-reperfusion.Med. Sci. Sports Exerc., Vol. 30, No. 8, pp. 1211-1216, 1998. Purpose: The purpose of these experiments was to test the hypothesis that endurance exercise will reduce ischemia and reperfusion(I-R). Methods: Female Sprague-Dawley rats (4 months old) were randomly assigned either a sedentary control group (N = 13) or an 13). trained animals ran 4 d·wk−1 (90 min·d−1) at ∼75% V˙O2max. Following...

The purpose of these experiments was to examine the effects dietary antioxidant supplementation with vitamin E (VE) and α-lipoic acid (α-LA) on biochemical physiological responses in vivo myocardial ischemia-reperfusion (I-R) aged rats. Male Fischer-334 rats (18 mo old) were assigned either 1) a control diet (CON) or 2) VE α-LA supplemented (ANTIOX). After 14-wk feeding period, animals each group underwent an I-R protocol (25 min ischemia 15 reperfusion). During reperfusion, peak arterial...

Overexpression of heat shock protein (HSP)72 is associated with cardioprotection. Hyperthermia-induced HSP72 overexpression attenuated senescence. While exercise also increases myocardial in young animals, it unknown whether this effect aging. Therefore, we investigated the aging on exercise-induced factor (HSF)-1 activation and expression. Male Fischer-344 rats (6 or 24 mo) were randomized to control, exercise, hyperthermic groups. Exercise consisted 2 days treadmill running (60 min/day,...

Dietary supplements containing arginine are among the most popular ergogenics intended to enhance strength, power and muscle recovery associated with both anaerobic aerobic exercise.The aim of present study was evaluate possible effect pre-exercise acute intake on performance exercise metabolism during incremental exhaustive in elite male wrestlers.Nine volunteer wrestlers (24.7±3.8 years) participated this study.The test-retest protocol used same subjects.The conducted using a cross-over...

We tested the hypothesis that chronic endurance exercise is associated with recruitment of four major upper airway muscles (genioglossus, digastric, sternohyoid, and omohyoid) results in an increased oxidative capacity a fast-toward-slow shift myosin heavy chain (MHC) isoforms these muscles. Female Sprague-Dawley rats (n = 8; 60 days old) performed treadmill exercises for 12 weeks (4 days/week; 90 minutes/day). Age-matched sedentary female 10) served as control animals. Training was increase...

Background: Gymnasts usually start intensive training from early childhood. The impact of such strenuous on the musculoskeletal system is not clear. Objectives: To evaluate relation between muscle strength ankle joint and foot structure in gymnasts. Methods: study population comprised 20 high level male gymnasts 17 non-athletic healthy controls. Arch indices were measured using a podoscope. Ankle plantar/dorsiflexion eversion/inversion strengths Biodex 3 dynamometer within protocol...

This study examined whether the exercise-increased extracellular heat shock protein 72 (eHsp72) levels in rats was associated with body temperature elevation during exercise. In all, 26 female Sprague-Dawley (3 mo old) were assigned randomly to control (CON; n = 8), exercise under warm (WEx; 9), or cold (CEx; 9). The WEx and CEx trained at 25 degrees C 4 C, respectively, for nine days using a treadmill. Before immediately after final bout, colonic temperatures measured as an index of...