The Acute Influence of Two Intensities of Aerobic Exercise on Strength Training Performance in Elderly Women

Abstract

The aim of this study was to compare the acute influence of 2 intensities of aerobic exercise on a strength training session in physically active elderly women. Twenty-five women (74.3 +/- 2.8 years) with previous experience in both resistance and aerobic exercise volunteered to perform aerobic activity (60 and 80% maximum heart rate) followed by a training session on leg press, leg extension, and leg curl exercises. After aerobic intensity training, the number of repetitions in each set was analyzed to determine whether the aerobic exercise affected the amount of volume completed in a resistance workout. The results showed a significant decrease in the number of repetitions per exercise after aerobic training intensities of 80 and 60%. Ratings of perceived exertion demonstrated that fatigue after the 80% workout was greater than after the 60% workout. It was concluded that, at the training intensities tested, 20 minutes of aerobic training may be enough to produce a negative impact on a strength training performance session of physically active elderly women.

Acute Resistance Exercise Performance Is Negatively Impacted by Prior Aerobic Endurance Exercise

“…Similar reductions in isokinetic peak torque (1) and leg press performance (46) have been reported following long slow distance (36-150 minutes) and interval cycle ergometry. In elderly women, larger reductions in repetition number were seen following a high-intensity (80% of HRmax) versus a moderate-intensity (60% of HRmax) treadmill protocol (26). During 9 weeks of concurrent training, similar lower-body strength attenuation has been reported between walking uphill and cycling (20-40 minutes) before RE (16).…”

“…When RE followed an AE protocol (P1-P4), subjects were given a 10-minute rest interval. Although previous studies have shown muscle performance may be compromised 2 minutes to 8 hours following AE (1,26,27,46), a 10-minute rest period was selected because it more realistically represents the amount of time taken between modalities in practical settings and has been studied previously (13). During this time, subjects spent 2 minutes on the treadmill cooling down from the AE protocol and performed 3 light sets of RE (1 set each of the high pull, squat, and bench press with 30-50% of 1RM for 5-10 repetitions per set) in preparation for the protocol which promptly began 10 minutes after completion of the AE protocol.…”

“…The authors suggested that RE performance may have been compromised because half of the workouts consisted of performing AE before RE (43). The acute fatigue hypothesis is one that has been studied on a limited basis but demonstrates merit when examining potential incompatibility (1,11,26,27,42,46).…”

“…These data indicate that AE exercise may have the most substantial adverse effects on lower-body rather than upper-body RE performance. However, only few studies have addressed this concept and only 4 investigations compared different types of AE exercise performed before RE (1,16,26,46). It is poorly understood whether the type of AE exercise (long slow distance, continuous moderate-to-high intensity, high-intensity intervals, or continuous incline running) may affect subsequent RE performance.…”

Déficit bilateral de força pós-reconstrução do ligamento cruzado anterior. DOI: 10.5007/1980-0037.2012v14n1p93

“…Após 48 horas de intervalo, foi feito um re-teste para avaliar a reprodutibilidade das cargas em 10RM. Os resultados mostraram-se semelhantes aos achados de Lemos et al 15 , com r >0,9 para os dois exercícios (cadeira extensora e mesa flexora). Para a realização dos testes de 10RM, os voluntários foram divididos em dois grupos aleatoriamente.…”