Abstract
We investigated the effects of low-load resistance training to failure performed with
different rest intervals on acute hormonal responses and long-term muscle and strength
gains. In the acute study, 14 participants were assigned to either a short rest (S,
30 s) or long rest (L, 150 s) protocol at 40% one-repetition maximum. Blood samples
were taken before and after the workout. Both groups showed significant (p<0.05) increases
in growth hormone and insulin-like growth factor 1 immediately post-workout. In the
longitudinal study, the same protocol as in the acute study was performed 2 times
per week for 8 weeks by 21 volunteers. Both groups showed significant increases in
triceps (S: 9.8±8.8%, L: 10.6±9.6%, p<0.05) and thigh (S: 5.7±4.7%, L: 8.3±6.4%, p<0.05)
cross-sectional area. One-repetition maximum also significantly increased for the
bench press (S: 9.9±6.9%, L: 6.5±5.8%, p<0.05) and squat (S: 5.2±6.7%, L: 5.4±3.5%,
p<0.05). In conclusion, our results suggest that acute hormonal responses, as well
as chronic changes in muscle hypertrophy and strength in low-load training to failure
are independent of the rest interval length.
Key words
hormonal responses - cross-sectional area - one-repetition maximum