European journal of applied physiology
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Eur. J. Appl. Physiol. · Sep 2013
Variable resistance training promotes greater fatigue resistance but not hypertrophy versus constant resistance training.
Loading using variable resistance devices, where the external resistance changes in line with the force:angle relationship, has been shown to cause greater acute neuromuscular fatigue and larger serum hormone responses. This may indicate a greater potential for adaptation during long-term training. Twelve (constant resistance group) and 11 (variable resistance group) men completed 20 weeks of resistance training with 10 men as non-training controls. ⋯ Acute loading-induced responses were assessed by concentric and isometric force, serum hormone concentrations and phosphorylation of intramuscular signalling proteins (0-30 min post-loading). Greater acute decreases in force (P < 0.05-0.01), and greater increases in serum testosterone and cortisol concentration (P < 0.05) and ERK 1/2 phosphorylation (P < 0.05) were observed following variable resistance loadings before and after training. Greater training-induced improvements in fatigue resistance occurred in the variable resistance training group, which may be due to greater acute fatigue and physiological responses during variable versus constant resistance loadings.
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Eur. J. Appl. Physiol. · Sep 2013
Relationship between core temperature, skin temperature, and heat flux during exercise in heat.
This paper investigates the relationship between core temperature (T c), skin temperature (T s) and heat flux (HF) during exercise in hot conditions. ⋯ Algorithms for T c measurement are location-specific and their accuracy is dependent, to a large degree, on sensor placement.