O2 Breathing at Altitude: Effects on Maximal Performance

Author(s):  
P. Cerretelli
Keyword(s):  
Author(s):  
Hana Baklouti ◽  
Asma Aloui ◽  
Davide Malatesta ◽  
Souad Baklouti ◽  
Nizar Souissi ◽  
...  

2018 ◽  
Vol 285 (1890) ◽  
pp. 20181775 ◽  
Author(s):  
Jesper G. Sørensen ◽  
Craig R. White ◽  
Grant A. Duffy ◽  
Steven L. Chown

For over a century, the hypothesis of temperature compensation, the maintenance of similar biological rates in species from different thermal environments, has remained controversial. An alternative idea, that fitness is greater at higher temperatures (the thermodynamic effect), has gained increasing traction. This alternative hypothesis is also being used to understand large-scale biodiversity responses to environmental change. Yet evidence in favour of each of these contrasting hypotheses continues to emerge. In consequence, the fundamental nature of organismal thermal responses and its implications remain unresolved. Here, we investigate these ideas explicitly using a global dataset of 619 observations of four categories of organismal performance, spanning 14 phyla and 403 species. In agreement with both hypotheses, we show a positive relationship between the temperature of maximal performance rate ( T opt ) and environmental temperature ( T env ) for developmental rate and locomotion speed, but not growth or photosynthesis rate. Next, we demonstrate that relationships between T env and the maximal performance rate ( U max ) are rarely significant and positive, as expected if a thermodynamic effect predominates. By contrast, a positive relationship between T opt and U max is always present, but markedly weaker than theoretically predicted. These outcomes demonstrate that while some form of thermodynamic effect exists, ample scope is present for biochemical and physiological adaptation to thermal environments in the form of temperature compensation.


2011 ◽  
Vol 43 (7) ◽  
pp. 1280-1286 ◽  
Author(s):  
EMILIE JEAN-ST-MICHEL ◽  
CEDRIC MANLHIOT ◽  
JING LI ◽  
MICHAEL TROPAK ◽  
MARIE M. MICHELSEN ◽  
...  

2018 ◽  
Vol 65 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Elizabeth Dean

Abstract To maximize the performance of an athlete, a team of experts work together to ensure each athlete achieves the maximal benefit from their prescribed exercise conditioning programs. In addition to the exercise specialists, the athlete’s team frequently includes psychologists (who address performance anxiety, stress, and depression), counselors (who address smoking cessation, reduction or elimination of alcohol consumption if necessary, weight optimization, and optimal sleep), and nutritionists (who address optimal nutrition and body mass attributes). Such a collaborative approach has become standard practice for athletes aiming to excel in their sports. Despite unequivocal and compelling evidence, this paradigm has only weakly been transferred to the needs of patients participating in rehabilitation programs. These individuals, like the athlete, also need to achieve their highest level of functional performance and recovery for carrying out their activities of daily living, managing the needs of their families, and often returning to work. This article reviews the evidence-based literature and the implications of this multifaceted approach in rehabilitation programs. The augmented benefits to exercise training and conditioning (prescriptive activity/exercise and less sitting) along with their ‘effect sizes’ are described in the rehabilitation context, in conjunction with smoking cessation, reduced harmful alcohol consumption, optimal nutrition, optimal body mass, manageable stress, and optimal sleep. These factors can be viewed as physical performance enhancers both in individuals participating in rehabilitation whose aim is maximal performance and recovery and in athletes aiming for maximal performance in their sports. Thus, without targeted attention to these lifestyle factors, rehabilitation outcomes cannot be maximized. The evidence presented in this article has implications for health professionals including physical therapists and others who are practicing in rehabilitation settings and those working with individuals in need in the community.


2019 ◽  
Vol 211 ◽  
pp. 112673 ◽  
Author(s):  
Hsen Hsouna ◽  
Omar Boukhris ◽  
Raouf Abdessalem ◽  
Khaled Trabelsi ◽  
Achraf Ammar ◽  
...  

2015 ◽  
Vol 10 (1) ◽  
pp. 26229 ◽  
Author(s):  
Hana Baklouti ◽  
Hamdi Chtourou ◽  
Asma Aloui ◽  
Anis Chaouachi ◽  
Nizar Souissi

PLoS ONE ◽  
2015 ◽  
Vol 10 (8) ◽  
pp. e0136400 ◽  
Author(s):  
Asma Aloui ◽  
Walid Briki ◽  
Hana Baklouti ◽  
Hamdi Chtourou ◽  
Tarak Driss ◽  
...  

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