However, pennation angle increases were greater in CON, and fascicle length changes were greater in ECC. Muscle hypertrophy and strength increases were similar between CON and ECC in all groups.

However, both CON and ECC resulted in similar overall changes in tendon Young’s modulus, in all groups. Positive changes in tendon Young’s modulus were observed after 4 weeks in all groups after which adaptations in young males plateaued but continued to increase in older males, suggesting a dampened rate of adaptation with age. Tendon biomechanical properties, muscle architecture and maximal voluntary contraction were assessed every 2 weeks and quadriceps muscle volume every 4 weeks. Twenty healthy young (24.5 ± 5.1 years) and 17 older males (68.1 ± 2.4 years) were randomly allocated to either isolated CON or ECC RET which took place 3/week for 8 weeks.

Therefore, this study aimed to establish the time course of muscle and tendon adaptations to submaximal CON and ECC RET. Further, whether the time course of muscle and tendon adaptations differs to the above is also unknown. However, whether submaximal (60% 1RM) CON or ECC contractions differ in their effectiveness is relatively unknown. Traditional RET consists of both concentric (CON) and eccentric (ECC) contractions nevertheless, isolated ECC contractions are metabolically less demanding and, thus, may be more suitable for older populations. Resistance exercise training (RET) is well-known to counteract negative age-related changes in both muscle and tendon tissue.

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