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et al., 2011 ) can be improved by a regular resistance or weight training program. In addition to the aforementioned merits, anaerobic performance was enhanced after regular resistance training ( Fatouros et al., 2005 ; Santos and Janeira, 2012 ). Considering the aspect of muscular performance, multiple sets or sessions of resistance training were superior to one single set or session of resistance training because of more training volume or loading ( Bottaro et al., 2011 ; Krieger, 2010 ). However, in contrast to the above-mentioned studies regarding multiple

Introduction Post‐activation potentiation (PAP) has been defined as an acute enhancement of muscular performance following a preload stimulus with maximal or submaximal muscle actions ( Gołaś et al., 2017 ; Hughes et al., 2016 ). Different physiological mechanisms have been proposed to explain the PAP. On the one hand, the phosphorylation of myosin regulatory light chains, what is related to increased rates of force development and peak isometric force ( Baudry and Duchateau, 2007 ). On the other hand, previous muscle contraction could raise the excitability of

Abstract

Traditionally, physiotherapy for cystic fibrosis focused mainly on airway clearance (clearing mucus from the lungs). This still makes up a large part of daily treatment, but the role of the physiotherapist in cystic fibrosis has expanded to include daily exercise, inhalation therapy, posture awareness and, for some, the management of urinary incontinence. The purpose of this study is to demonstrate the necessity and the efficiency of various methods of chest physiotherapy and individualized unsupervised exercise program, in the improvement of body composition and physical performance. This study included 12 children with cystic fibrosis, with ages between 8-13 years. Each subject was evaluated in terms of body composition, effort capacity and lower body muscular performance, at the beginning of the study and after 12 months. The intervention consisted in classic respiratory clearance and physiotherapy techniques (5 times a week) and an individualized unsupervised exercise program (3 times a week). After 12 months we noticed a significant improvement of the measured parameters: body weight increased from 32.25±5.5 to 33.53±5.4 kg (p <0.001), skeletal muscle mass increased from a mean of 16.04±4.1 to 17.01±4.2 (p<0.001), the fitness score, increased from a mean of 71±3.8 points to73±3.8, (p<0.001) and power and force also registered positive evolutions (from 19.3±2.68 to 21.65±2.4 W/kg and respectively 19.68±2.689 to 20.81±2.98 N/kg). The association between physiotherapy procedures and an individualized (after a proper clinical assessment) unsupervised exercise program, proved to be an effective, relatively simple and accessible (regardless of social class) intervention.

. Vuori (2002) Effect of a vibration exposure on muscular performance and body balance. Randomized cross-over study. Clin. Physiol. Funct. Imag. 22:145-152. Torvinen S., H. Sievänen, T. A. H. Järvinen, M. Pasanen, S. Kontulainen, P. Kannus (2002) Effect of 4-min vertical whole body vibration on muscle performance and body balance: a randomized cross-over study. Int. J. Sports Med. 23:374-379.

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radioligand and a solid-phase separation technique. Clin Chem, 1979; 25: 665-668 Senna G, Salles BF, Prestes J, Mello RA, Simão R. Influence of two different rest interval lengths in resistance training sessions for upper and lower body. J Sports Sci Med, 2009; 8: 197-202 Sforzo GA, Touey PR. Manipulating exercise order affects muscular performance during a resistance exercise training session. J Strength Cond Res, 1996; 10: 20-24 Simão R, Leite RD, Speretta GFF, Souto Maior A, Salles BF, Souza Junior TP, Vingren JL, Willardson J. Influence of upper-body exercise order on