Abstract
Six young (mean = 23 years) and 6 older (mean = 76 years) adults participated in isometric resistance training 5 days/week for 6 weeks. The task involved isometric fifth finger abduction. Maximal motor unit discharge rates (MUDRs) were obtained from the abductor digiti minimi of each hand at 0, 2, 14, and 42 days of training using a quadrifilar needle electrode and automatic spike recognition software. In agreement with previous findings, maximal MUDR at baseline was significantly lower in older adults (P < 0.001), averaging 51.5 (±17.13) Hz in young and 43.3 (±14.88) Hz in older adults. In response to resistance training, maximal voluntary force increased 25% in young and 33% in older subjects (P < 0.001). Maximal MUDR increased significantly (11% young, 23% older) on day 2 [F(3,36) = 2.58, P < 0.05], but in older subjects returned to baseline levels thereafter. These adaptations in abductor digiti minimi MUDR suggest a two-part response to strengthening fifth finger abduction: early disinhibition followed by altered MU activation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 542-550 |
| Number of pages | 9 |
| Journal | Muscle and Nerve |
| Volume | 24 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 10 2001 |
| Externally published | Yes |
Fingerprint
Keywords
- Aging
- Motor unit
- Neural adaptation
- Strength
ASJC Scopus subject areas
- Clinical Neurology
- Neuroscience(all)
Cite this
Adaptations in maximal motor unit discharge rate to strength training in young and older adults. / Patten, Carolynn; Kamen, Gary; Rowland, Daniel M.
In: Muscle and Nerve, Vol. 24, No. 4, 10.04.2001, p. 542-550.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Adaptations in maximal motor unit discharge rate to strength training in young and older adults
AU - Patten, Carolynn
AU - Kamen, Gary
AU - Rowland, Daniel M.
PY - 2001/4/10
Y1 - 2001/4/10
N2 - Six young (mean = 23 years) and 6 older (mean = 76 years) adults participated in isometric resistance training 5 days/week for 6 weeks. The task involved isometric fifth finger abduction. Maximal motor unit discharge rates (MUDRs) were obtained from the abductor digiti minimi of each hand at 0, 2, 14, and 42 days of training using a quadrifilar needle electrode and automatic spike recognition software. In agreement with previous findings, maximal MUDR at baseline was significantly lower in older adults (P < 0.001), averaging 51.5 (±17.13) Hz in young and 43.3 (±14.88) Hz in older adults. In response to resistance training, maximal voluntary force increased 25% in young and 33% in older subjects (P < 0.001). Maximal MUDR increased significantly (11% young, 23% older) on day 2 [F(3,36) = 2.58, P < 0.05], but in older subjects returned to baseline levels thereafter. These adaptations in abductor digiti minimi MUDR suggest a two-part response to strengthening fifth finger abduction: early disinhibition followed by altered MU activation.
AB - Six young (mean = 23 years) and 6 older (mean = 76 years) adults participated in isometric resistance training 5 days/week for 6 weeks. The task involved isometric fifth finger abduction. Maximal motor unit discharge rates (MUDRs) were obtained from the abductor digiti minimi of each hand at 0, 2, 14, and 42 days of training using a quadrifilar needle electrode and automatic spike recognition software. In agreement with previous findings, maximal MUDR at baseline was significantly lower in older adults (P < 0.001), averaging 51.5 (±17.13) Hz in young and 43.3 (±14.88) Hz in older adults. In response to resistance training, maximal voluntary force increased 25% in young and 33% in older subjects (P < 0.001). Maximal MUDR increased significantly (11% young, 23% older) on day 2 [F(3,36) = 2.58, P < 0.05], but in older subjects returned to baseline levels thereafter. These adaptations in abductor digiti minimi MUDR suggest a two-part response to strengthening fifth finger abduction: early disinhibition followed by altered MU activation.
KW - Aging
KW - Motor unit
KW - Neural adaptation
KW - Strength
UR - http://www.scopus.com/inward/record.url?scp=0035085636&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035085636&partnerID=8YFLogxK
U2 - 10.1002/mus.1038
DO - 10.1002/mus.1038
M3 - Article
C2 - 11268027
AN - SCOPUS:0035085636
VL - 24
SP - 542
EP - 550
JO - Muscle and Nerve
JF - Muscle and Nerve
SN - 0148-639X
IS - 4
ER -