The Effects of Concurrent Resistance and Endurance Training Follow a Detraining Period in Elementary School Students

Abstract

The purpose of this study was to compare the effects of an 8-week training period of resistance training alone (GR), or combined resistance and endurance training (GCOM), followed by 12 weeks of detraining (DT) on body composition, explosive strength, and ·VO₂max adaptations in a large sample of adolescent school boys. Forty-two healthy boys recruited from a Portuguese public high school (age: 13.3 ± 1.04 years) were assigned to 2 experimental groups to train twice a week for 8 weeks: GR (n = 15), GCOM (n = 15), and a control group (GC: n = 12; no training program). Significant training-induced differences were observed in 1- and 3-kg medicine ball throw gains (GR: +10.3 and +9.8%, respectively; GCOM: +14.4 and +7%, respectively), whereas no significant changes were observed after a DT period in both the experimental groups. Significant training-induced gains in the height and length of the countermovement (vertical-and-horizontal) jumps were observed in both the experimental groups. No differences were perceived after a DT period in lower limb power. Time at 20 m decreased significantly for both intervention programs (GR: -11.5% and GCOM: -12.4%, <0.00), but either GR or GCOM groups kept the running speed after a DT period of 12 weeks. After training, the ·VO₂max increased only significantly for GCOM (4.6%, p = 0.01). A significant loss was observed after a DT period in GR but not in GCOM. Performing resistance and endurance training in the same workout does not impair strength development in young school boys. As expected, strength training by itself does not improve aerobic capacity. Our results also suggest that training program effects even persist at the end of the DT period.

Physical exercise, detraining and lipid profile in obese children: a systematic review

“…13 The situation in relation to lipid parameters is similar in the adult population: they are not modified following detraining. 16,17 On the contrary, other studies have reported losses of fitness benefits gained in children 11,12 and adolescents. 14 This systematic review showed that HDL cholesterol increased following detraining, and this is confirmed upon analyzing intragroup (ES= 0.12; 95% CI 0.02-0.29) and intergroup results (ES= 0.49; 95% CI 0.18-0.81).…”

“…10 Information regarding the effects of detraining on younger populations is scarce and results have been controversial. [11][12][13][14] In the case of adults, the situation is similar, with negative effects on lipid metabolism 15 or no changes at all. 16,17 In this context, the objective of this study was to assess the effects of detraining (cessation of scheduled physical exercise) on the lipid profile (HDL, LDL, total cholesterol [TC] and TG) of obese children.…”

Fatores Associados À Aptidão Cardiorrespiratória De Escolares

“…No presente estudo, a associação entre atividade física e aptidão cardiorrespiratória foi encontrada apenas para os escolares com idade inferior a 14 anos. Apesar de não ter sido investigado no presente estudo, adolescentes mais velhos se engajam em práticas corporais as quais não têm como objetivo aumentar a aptidão cardiorrespiratória, tais como treinamento de força 23 , fato que pode explicar a não associação encontrada. Isso se torna relevante pelo fato de que os tipos de atividades físicas realizadas não foram discriminadas pelo instrumento utilizado.…”

Ejercicio físico, desentrenamiento y perfil lipídico en niños obesos: una revisión sistemática

“…13 Algo similar ocurre en población adulta respecto a los parámetros lipídicos, que se mantienen sin cambios tras el desentrenamiento. 16,17 Por el contrario, otros trabajos informan pérdidas de las ganancias observadas respecto a la condición física en niños 11,12 y adolescentes. 14 La presente revisión sistemática mostró un aumento del colesterol HDL tras el período de desentrenamiento, hecho que se constata tras analizar los resultados intra-(TE= 0,12; IC 95% 0,02-0,29) e intergrupo (TE= 0,49; IC 95% 0,18-0,81).…”

“…10 La información relativa sobre los efectos del desentrenamiento en las poblaciones más jóvenes no es muy amplia y muestra resultados contradictorios. [11][12][13][14] Por su parte, en los adultos, ocurre algo similar y se muestran efectos negativos sobre el metabolismo lipídico 15 o no se observan cambios al respecto. 16,17 En este contexto, el objetivo del presente estudio fue evaluar los efectos del desentrenamiento (cese del ejercicio físico programado) sobre el perfil lipídico (HDL, LDL, CT y TG) en niños obesos.…”