For convergent validity ( i.e. , the relationship between PAQs and other measures ) , similar overall associations were found between Past-week PAQs and Usual-week PAQs .
However , PAQs were more strongly associated with direct measures of physical activity ( e.g. , accelerometer ) than indirect measures of physical activity ( i.e. , physical fitness ) , irrespective of recall methods .
Only a few interview-administered PAQs exhibited positive ratings for a single psychometric property , although the other properties were either rated as poor or question able , demonstrating the limitations of current PAQs .
Exercise dosing to retain resistance training adaptations in young and older adults.
UNLABELLED Resistance training ( RT ) is a proven sarcopenia countermeasure with a high degree of potency . However , sustainability remains a major issue that could limit the appeal of RT as a therapeutic approach without well-defined dosing requirements to maintain gains . PURPOSE To test the efficacy of two maintenance prescriptions on muscle mass , myofiber size and type distribution , and strength . We hypothesized the minimum dose required to maintain RT-induced adaptations would be greater in the old ( 60 - 75 yr ) versus young ( 20 - 35 yr ) . METHODS Seventy adults participated in a two-phase exercise trial that consisted of RT 3 d·wk for 16 wk ( phase 1 ) followed by a 32-wk period ( phase 2 ) with r and om assignment to detraining or one of two maintenance prescriptions ( reducing the dose to one-third or one-ninth of that during phase 1 ) . RESULTS Phase 1 result ed in expected gains in strength , myofiber size , and muscle mass along with the typical IIx-to-IIa shift in myofiber-type distribution . Both maintenance prescriptions preserved phase 1 muscle hypertrophy in the young but not the old . In fact , the one-third maintenance dose led to additional myofiber hypertrophy in the young . In both age groups , detraining reversed the phase 1 IIx-to-IIa myofiber-type shift , whereas a dose response was evident during maintenance training with the one-third dose better maintaining the shift . Strength gained during phase 1 was largely retained throughout detraining with only a slight reduction at the final time point . CONCLUSIONS We conclude that older adults require a higher dose of weekly loading than the young to maintain myofiber hypertrophy attained during a progressive RT program , yet gains in specific strength among older adults were well preserved and remained at or above levels of the untrained young
For convergent validity ( i.e. , the relationship between PAQs and other measures ) , similar overall associations were found between Past-week PAQs and Usual-week PAQs .
However , PAQs were more strongly associated with direct measures of physical activity ( e.g. , accelerometer ) than indirect measures of physical activity ( i.e. , physical fitness ) , irrespective of recall methods .
Only a few interview-administered PAQs exhibited positive ratings for a single psychometric property , although the other properties were either rated as poor or question able , demonstrating the limitations of current PAQs .