Dissertation committee:
Τερζής Γεράσιμος, Καθηγητής, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Μπογδάνης Γρηγόρης, Καθηγητής, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Ζάρας Νικόλαος, Επίκουρος Καθηγητής, Σ.Ε.Φ.Α.Α, Δ.Π.Θ.
Αποστολίδης Νίκος, Καθηγητής, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Τουμπέκης Αργύρης, Καθηγητής, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Καραμπάτσος Γιώργος, Αναπληρωτής καθηγητής, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Δόντη Ολύβια, Αναπληρώτρια καθηγήτρια, Σ.Ε.Φ.Α.Α., Ε.Κ.Π.Α
Summary:
Aim of the study was to investigate the effects of two different training frequencies, every 7 or 14 days, after 12 weeks of concurrent resistance and aerobic training, on muscle strength/power, aerobic power, morphology and bone mass density in young females. Thirty-four (34) young females followed 12 weeks of concurrent resistance and aerobic training. Thereafter, participants were assigned into 3 groups and continued for 12 more weeks as follows: group A once every 7 days (G7), group B once every 14 days (G14), and group C cessation of training (GD). Thereafter, all participants followed 12 additional weeks of training cessation. The following were measured before, after the systematic training period, after the end of the reduced training frequency period and after the end of complete detraining: body composition, leg press and bench press 1-RM, counter-movement jump, countermovement push up, quadriceps cross-sectional area (CSA), vastus lateralis and triceps long head muscle architecture and maximum aerobic power. Student T-tests were used to detect differences pre to post systematic training, for the initial training period (T1 to T2). Repeated analysis of variance (ANOVA) was used to test the interaction between training intervention and time (T2 to T5) and identify differences among groups (G7, G14 and GD). Performance and muscle mass increased after the initial 12-week training period. Leg press and bench press 1-RM, quadriceps CSA and aerobic power remained unchanged after reduced training for G7, and decreased for G14 (-4.4±3.5%; -5,9±4,9%; -5.9±1.8%; -9.0±7.8%, respectively, P<0.05), maintaining almost 90% of the training adaptations Countermovement push up power decreased similarly in both groups after the first 6 weeks of reduced training frequency (group 1/7: -6,7±7,7%; p<0.05, group 1/14: 8,4±7,6%, p<0.05). However, countermovement push up power did not change during the last 6 weeks of reduced training frequency (p>0.05), maintain a large part of the training adaptations. These results suggest that lower/upper extremity muscle strength, muscle mass and aerobic power are maintained when training frequency is reduced to one training session per week maintaining a high training intensity, whereas with one training session every 14 days 90-95% of adaptations are preserved, after 12 weeks of reduced training frequency. In contrast, upper extremity muscle power is significantly reduced by training once every week or once every 14 days, but after 12 weeks of reduced training frequency, 95% and 90%, respectively, of the adaptations from systematic training are preserved, maintaining a high training intensity.
Keywords:
detraining, muscle strength, muscle power, muscle hypertrophy, cardiovascular endurance, high intensity training
