Asociación entre la Arquitectura Muscular y el Índice de Calidad Muscular en Adultos Sedentarios / Association Between Muscle Architecture and Muscle Quality Index in Sedentary Adults

La evaluación de la calidad y la arquitectura muscular son importantes para comprender y cuantificar los cambios musculares asociados con el envejecimiento y el estilo de vida sedentario, además nos facilita información de la capacidad del músculo para generar fuerza, potencia o funcionalidad. los objetivos del estudio fueron (I) determinar la asociación entre los parámetros de la arquitectura muscular y el índice de calidad muscular (MQI) y (II) determinar la asociación entre los parámetros de la arquitectura muscular y la potencia media relativa del sit to stand test (STS). Únicamente el grosor muscular (MT) mostró una asociación moderada con el MQI (r = 0,545). En contraste, tanto la longitud del fascículo (FL) como el ángulo de penación (PA) exhibieron asociaciones "muy bajas", las cuales no resultaron significativas con el MQI. Al examinar la relación de los parámetros de la arquitectura muscular con la potencia media relativa de STS, MT presentó una asociación "moderada" (r = 0,444). Sin embargo, tanto FL como PA mostraron asociaciones "muy bajas" y "bajas", respectivamente, con la potencia media relativa al STS. En conclusión, estos hallazgos refuerzan la idea de que MT puede ser un indicador relevante de la calidad muscular y la capacidad de generar potencia en la prueba de STS. Específicamente, se observó que un aumento en MT estaba asociado con una mejora en MQI y la potencia media relativa de STS.

SUMMARY: Assessment of muscle quality and architecture is important for understanding and quantifying muscle changes associated with aging and a sedentary lifestyle and provides information on the muscle's ability to generate strength, power, or function. The aims of the study were (I) to determine the association between muscle architecture parameters and muscle quality index (MQI) and (II) to determine the association between muscle architecture parameters and mean relative power in the sit-to-stand test (STS). Only muscle thickness (MT) showed a moderate association with MQI (r = 0.545). In contrast, both fascicle length (FL) and penile angle (PA) exhibited "very low" associations, which were not significant with the MQI. When examining the relationship between muscle architecture parameters and mean relative STS power, MT presented a "moderate" association (r = 0.444). However, both LF and PA showed "very low" and "low" associations, respectively, with a mean power relative to STS. In conclusion, these findings reinforce the idea that MT may be a relevant indicator of muscle quality and ability to generate power in the STS test. Specifically, an increase in MT was associated with an improvement in MQI and mean power relative to STS.

Divergent Resistance Training Programs, Ramification on the Absolute and Relative Strength and Endurance among College Men

The objective of this research was to scrutinize the impact of three resistance-training programs on absolute andreciprocal durability and muscular strength. Forty-three male subjects were assigned to three groups: highresistance-low repetition group (HRLRG, n=15) performed 3 sets of 6-8 RM (repetition maximum) each session,the medium resistance-medium repetition group (MRMRG, n= 16) performed 2 sets of 30-40 RM per session andthe low resistance-high repetition group (LRHRG, n= 12) worked out a set of 100-150 RM per session. Thetraining for the participants was bench press thrice a week for nine weeks. The data revealed an improvement of20% in maximal strength of the HRLRG and this was greater than 8% and 5 % improvements recorded forMRMRG and LRHRG, respectively. Regarding the absolute endurance, the trends however were reversed asLRHRG registered gains of 41%, MRMRG improved by 39% and HRLRG gained only 28%. The results forrelative endurance assessment reported that HRLRG’s accomplishments essentially was declined by 7 % aftertraining and was considerably inferior to the 22 % and 28 % improvements achieved by other two groups. It wasestablished that skeletal muscles make general and specific modifications to a training stimulus and the stabilityof these adaptations is primarily reliant upon the intensity and duration of the training protocol.