17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1321
Session: [OP-PM50] Bed Rest & Inactivity
Lecture room: L8
Date & time: 08.07.2016 / -
Authors: Garcia-Hortal, M., Brickley, G., Beale, L., Doust, J.
Institution: University of Brighton
Department: School of Sport and Service Management
Country: United Kingdom
Abstract text Introduction During the periodised training macrocycle, athletes across all sports experience phases in which training is limited or ceases entirely (Bosquet et al., 2013). To date, detraining literature has not analysed the weekly effects of training stoppage nor determined the reliability of tests used as baseline pre-detraining measurements. A comprehensive understanding of detraining processes is imperative in effective program design, especially during off-season and pre-season periods (Mujika & Padilla, 2001). Therefore, the aim of this study is to assess the change in functional and physiological markers, related to strength and power, associated with short-term detraining in a young healthy population. Methods With institutional ethics approval, eleven healthy participants (5 females; mean SD age= 21.6 2.9 yr, height =163.2 13.3 cm, body mass= 68.8 32.3 kg and 6 males; mean SD age 21.8 4.7 yr, height = 175.3 7.6 cm, body mass= 72.2 7.6 kg) completed a two weeks stable position (SP) to assure that the baseline values were accurate for each participant. To date, four of the aforementioned participants (1 male, 3 females) have completed four weeks of detraining (DTR). Maximal voluntary isometric contractions (MVIC) coupled with electromyography (EMG) of the vastus medialis (VM) and vastus lateralis (VL) of the quadriceps muscle, countermovement and squat jumps (CMJ, SJ), isokinetic leg press (ILP) and six-second Wingate (6sec-WAnT) tests were carried out each week during the six weeks that formed the study. Results All tests, except 6sec-WAnT, during the SP showed no significant difference between the three trials (MVIC: P=0.165; EMG VM: P=0.707; EMG VL: P=0.538; CMJ: P=0.837; SJ: P=0.520; ILP: P=0.132). 6sec-WAnT (P=0.018) showed that males were more powerful in the third test of the SP. Acute losses in strength tests (ILP, MVIC) and SJ were found in DTR (i.e: 18 and 21% decline at weeks 3 and 4 in ILP); whereas in power based tests (6sec-WAnT, CMJ) the changes were not as significant. Discussion These results suggest that in future studies using the same procedures, familiarisation would be crucial when using 6sec-WAnT. Preliminary results suggest that short-term detraining elicits a loss in voluntary muscle force output and the underlying mechanisms warrant further investigation (Koundourakis et al., 2014). References Bosquet L, Berryman N, Dupuy O, Mejary S, Arvisasis D, Bherer L, Mujika I (2013). Scand J Med Sci Sports, 23(3), 140149. Koundourakis NE, Androulakis NE, Malliaraki N, Tsatsanis C, Venihaki M, Margioris AN (2014). PLoS one, 9(2). Mujika, I. & Padilla, S. (2001). Med Sci Sports Exerc, 33(8), 12971303. *Data from 4 participants is currently included. Data from ~12 participants will be included by end of June 2016.
Topic: Physiology
Keyword I: short-term detraining
Keyword II: strength and power
Keyword III: stable position