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Lateral trunk muscles may contribute to the excessive ipsilateral trunk lean, which is a mechanical alteration related to impairment in hip and knee kinematics. This study aimed to investigate if hip and knee kinematics, lateral abdominal muscle thickness, and trunk muscle endurance are associated differently in men and women. Forty-six participants (27 men and 19 women) completed the following assessments: (1) lateral abdominal muscles thickness [external oblique + internal oblique + transversus abdominis] measured with ultrasound; (2) hip adduction (HADD) and knee frontal plane projection angle (FPPA) during single-leg squat; (3) muscle endurance in the side plank test. We did not find significant associations between HADD and lateral abdominal muscle thickness (men: r = 0.205; p = 0.315; women: r = 0.358; p = 0.145) or side plank time (men: rs = − 0.102; p = 0.614; women: rs = 0.391; p = 0.098). Moreover, no significant associations were found between FPPA and lateral abdominal muscle thickness (men: r = 0.012, p = 0.953; women: r = 0.326, p = 0.186) or side plank time (men: rs = 0.087, p = 0.667; women: rs = 0.319, p = 0.184). A strong association between lateral abdominal muscle thickness and muscle endurance was found only in women (r = 0.683; p = 0.002). Hip and knee kinematics were not associated with lateral abdominal muscle structure or endurance in men and women. Muscle structure seems to be associated with time to exhaustion in a side plank test only in women.

PURPOSE: There is a lack of information on the effects of power training (PT) as an alternative to traditional strength training (TST) during concurrent training (CT) in older individuals. This study aimed to verify the neuromuscular adaptations that occurred following 16-week interventions with two CT models in older men: high-intensity interval training (HIIT) combined with either TST or PT.METHODS: Thirty-five older men (65.8 ± 3.9 years) were randomly assigned into one of two training groups CTS: TST + HIIT (n = 18) or CTP: PT + HIIT (n = 17). CTS performed resistance training at intensities ranging from 65 to 80% of 1 RM at slow controlled speed, whereas CTP trained at intensities ranging from 40 to 60% of 1 RM at maximal intentional speed. Lower body one-repetition maximum (1 RM), isometric rate of force development (RFD), countermovement jump (CMJ) muscle power output, quadriceps femoris muscles thickness (QF MT), and peak oxygen uptake (VO 2peak) were assessed before training and after 8 and 16 weeks of CT. RESULTS: Groups improved similarly in all primary outcomes (P CONCLUSION: CT models were effective for improving maximal and explosive force (1 RM, RFD, and CMJ power), QF MT, and VO 2peak. Moreover, despite that using lower loading intensities, PT induced similar adaptations to those of TST.